First off, let me say that the RotoFab is well engineered, well packaged, excellent documentation (much better than K&N's) and the WOT sound is awesome.

But........ At low, partial throttle, my car sounds terrible. Low moaning sound, sounds like the motor is bogging down. I've had several CAI's and I've never had one that made so much noise at low RPM's. And it's definately not pleasant noises, at least to me. I went back through all the posts, and I didn't find anyone who even mentioned it.

I expected to not really hear the intake much on slow, partial throttle driving, based on my past experiences. Once I hit a certain rpm range/gear, then it sounds fine. My install is good. Only other mod I have is Stolen Fox's H-pipe.

I only left it on for 2 days, drove around 70 miles. Took it off at 2 am this morning and put the stock back on, it was bothering me that much.

The 3 audio clips that RotoFab provided, the one from inside the car was a 0-60, so you didn't hear the low rpm. And Kevin stated that you wouldn't really notice the CAI at normal driving. Well, I sure did.

Is it just me witrh this? Anyone else have it? It's killing me, cause I really wanted the CAI, but the sound from inside the car was embarrasing. Bogging.. Bogging..Bogging Sounded like it wanted to fart.:drink:

I spoke on the phone yesterday to a member, who had some bogging as well. Not sure if it was as bad as mine.

Anyone, please, give me some feedback. Giving the car time to learn wouldn't have anything to do with the sound quality, would it? I haven't heard back from Kevin so I'm asking for help?


HELP!!!

Orangetiger, I can hear the same sound with my stock intake. I wouldn't expect it to get any quieter with a CAI but I think the overall benefits of the CAI would outweigh the sound issue.

Your mileage, as they say.....

No man, it's EXTREME. Nothing like stock. It sounded like the car was broke.

Wow. That can't sound good.

Would any of the others on the board with RotoFab CAIs installed care to comment?

Interesting. I don't have that sound at all. Normal driving sounds just like the stock. Get on it a bit and its wakes right up. I was going to ask if you could maybe get some footage of the sounds for us but you took it off.

I cant say the same for mine, its virtually not even there at low/ partial throttle. Did you check to make sure the intake was on the throttle body correctly. Also check the filter inside and out to make sure no "abnormal" debris are attracting to it. give the maf sensor a thorough check to make sure there are no discrepancies there either.

just my 2 cents man hope it helps!!:)

Did you make sure there was no lose hoses on the intake. A lose vacuume hose would make the exact sound your talking about.

I re-installed it twice, same thing. I've installed a bunch, so the install was good. And believ me, I checked and re-checked. I kept thinking MAf, but the sound is ok back at stock. Actually, sounds better since the H pipe install.

But, I do have a whisteling sound I'm going to take it in to check. Sounds like interference, but it's coming from under the hood. It's noticeable at idle and with the stock intake as you drive off. I checked my battery terminals, un-hooked all electronics, still there. Any ideas on that?

I had the H pipe installed the same day my CAI showed up. I'm not sure my car is running right. Or it's just my imagination. I tried to chirp the tires a little from a stop a couple times yesterday, and it wouldn't. Now I wasn't flooring it, just a little extra gas on takeoff. I'm hopeing that I need the 8150 done, because my shifing sucks.

What would you have the dealer check? Just for codes?

I am going to reinstall it this weekend. I wanted it stock when I stopped at dealer to let him listen to whistling sound. I'll get a recording then.

But man, that CAI noise was aweful. Help me out here guys, play the detective....
Somehow, this all has to be related...

You know now that i think about it i have a whisteling sound at idle too. Im going to get a recording of it later on today and ill post it in this thread to see if we have the same sound

Did you make sure there was no lose hoses on the intake. A lose vacuume hose would make the exact sound your talking about.

Would it make a whistling sound too? The whistling sound makes me thing vacume. But there were definately no hoses loose on the CAI, but what about the car itself? It's not as peppy as it was. It's fine at normal highway speeds though.

OK, Clues:

1. CAI, terrible sound, bogging at low revs
2. Whistling sound at start up and roll off, can't tell after that
3. Bogging sound goes away with stock intake, whistle still there
4. Car feels sluggish when I goose it (or I was thinking that was just the transmission shifts)
5. Transmission - shifting worse than new, hope I can get 8150 performed.

First deduction.... Vacume??? MAF???

I have a whistling sound at idle, too, but only when the car is cold. When warmed up the whistling is gone.

hmmmm.... without opening my hood I'm not even sure if this is possible with our layout but how about a loose corner of hood insulation being pulled down into the air box?

I have a whistling sound at idle, too, but only when the car is cold. When warmed up the whistling is gone.

Yea, I don't know if I've noticed it when warm, I'll check. SO maybe cross of whistling sound from my clue list?

hmmmm.... without opening my hood I'm not even sure if this is possible with our layout but how about a loose corner of hood insulation being pulled down into the air box?

No man, I was all over and under the car. I spent 4 hours in the garage before I took it off, double and triple checking everything. I had a spotlight under the car, and I used a flashighlight from above as well, in a bright lighted garage.

I think it's part of a bigger / different issue. Would a MAF do all this? Or a loose vacume hose? Will a loose vacume hose generate a code?
Look at my clues again:

OK, Clues:

1. CAI, terrible sound, bogging at low revs
2. Whistling sound at start up and roll off, can't tell after that(MAYBE JUST WHEN COLD??)
3. Bogging sound goes away with stock intake, whistle still there
4. Car feels sluggish when I goose it (or I was thinking that was just the transmission shifts)
5. Transmission - shifting worse than new, hope I can get 8150 performed.

No man, I was all over and under the car. I spent 4 hours in the garage before I took it off, double and triple checking everything. I had a spotlight under the car, and I used a flashighlight from above as well, in a bright lighted garage.

I think it's part of a bigger / different issue. Would a MAF do all this? Or a loose vacume hose? Will a loose vacume hose generate a code?
Look at my clues again:

OK, Clues:

1. CAI, terrible sound, bogging at low revs
2. Whistling sound at start up and roll off, can't tell after that(MAYBE JUST WHEN COLD??)
3. Bogging sound goes away with stock intake, whistle still there
4. Car feels sluggish when I goose it (or I was thinking that was just the transmission shifts)
5. Transmission - shifting worse than new, hope I can get 8150 performed.

a big vacuum leak might cause that type of thing. Not sure what, if any, large vac connections we have but on other cars the 2 that come to mind are PCV valve and brake booster. I assume you made sure there was no paper or anything inside the cone filter itself?

I assume you made sure there was no paper or anything inside the cone filter itself?
Seriously, it does sound like it could be starving for air.

Seriously, it does sound like it could be starving for air.

Yea, it does. I don't think its an outlandish idea. I can see something like oiling instructions being packed inside the filter. I've seen stranger things.

Heres my guess. Did you remember to reconnect the MAF electrical plug? I forgot during my install and the car did some strage stuff when started. it would be easy to miss if the plug is turned down under the MAF tube.

--Mike

Nothing in the filter, and I re-conected the MAF, sure on both. I took it off, checked inside all the pipes, checked inside the throttle body even.

Anyone know where all the vacume lines are? There's a hell of a lot going on under the hood in these things.

Just stopped by dealer and made apt. for Mondaythey will check MAF and hopefully do the ECU update. As far as the whistle, he said it was the alternator and was normal. I do hear it when it is warm too. My whistle goes up when I give it gas. Sounds like the old radio interference.

I think with the stock air filter on, I still have a air issue, it just is quieter and I can't hear it. My car seems sluggish at low revs, then once it takes off it's ok.

Hell, I'm not sure now, I keep thinking it's this, then that. But man guys, with the CAI it was AWFUL. So, low speed air problem, goes away on upper end (or the car is powerful enough to hide it). Still vacume? MAF?

I appreciate the feedback, keep it coming please.

My baby is sick.... and I'm having sympathy pains.

OrangeTiger, for what it's worth, my car - also a GT - doesn't have much going for it when the revs are below, say 2250 rpm or so. For example, just pootin' around in a residential neighborhood at 30 mph in "D," air conditioner on, giving the thing a nice little throttle push doesn't result in much happening without a downshift from the transmission. And I do hear that noise you describe under these circumstances. If the transmisson were a bit more sensitive to downshift I wouldn't even notice it.

Mine did the same thing too. At part throttle acceleration, the car sounds like it was bogging down. Dont know why but it did, but doesnt do it with the stock intake.

Orange tiger, these cars do feel sluggish down low, but there is no torque there. I dont even do a burnout at the track in my G8 because there is no need with the lack of bottom end torque. This engine as well as most LSx's are top end motors. That is why a stall converter 3200-3600 was the best bang for the buck on a LS1 B4C/Z28. Have to get it in the powerband. Man if this car had my B4C's low end torque with its high rev abilities, that would be awesome!!!!!!

Here's a question for all, how many of you really hear the CAI under normal driving? If you're not punching it, do you hear it? And if you do, does it sound like crap? Does it make you want to look around and see if anyone is looking?

Especially from a start to say 35-45 mph using normal throttle, do you know you have a CAI on? Any CAI I've ever had, I really didn't know I had one installed until I got in the throttle a little bit and the rpm got into the power band.

My Hemi Magnum, K&N Intake, under normal driving, you didn't know a CAI was there. Then you punched it and the CAI woke up.

Damn, I wish I had recorded it. This was INTENSE AWFUL ANNOYING sound. Made the car sound like ****. Especially the easy part throttle take offs, up to around 25 mph. And it had a much worse sound, then the tone changed and it was normal CAI sound, but still at much less throttle and a slower speed than I expected.

And why would I hear the CAI groaning at 1200-1400 rpm going 15-20 mph?

So, who hears their CAI and who doesn't under low loads/ low speeds?

I know I'm rambling on, but I really want to figure this out. And I really want the CAI too.
Something wrong somewhere.

Im at a loss on this one. Judging from what im reading it has to be something with the intake. You say that when you but the stocker back on the problem was gone? Yes its correct about this car dont seem to hit the powerband until around 3k. The whistling sound does sound likes it coming from the Alt. Ive never heard it that loudly though. In park i can hear it clear as day with the front windows down. Im thing it has to have something to with the MAF. Since it is an oil filter on the roto-fab maybe its possible that it botherd the MAF. Ive seen people over oil the KNN and mess up there MAF.

Here's a question for all, how many of you really hear the CAI under normal driving? If you're not punching it, do you hear it? And if you do, does it sound like crap? Does it make you want to look around and see if anyone is looking?

Especially from a start to say 35-45 mph using normal throttle? Any CAI I've ever had, I really didn't know I had a CAI until I got in the throttle a little bit and the rpm got into the power band.

My Hemi Magnum, K&N Intake, under normal driving, you didn't know a CAI was there. Then you punched it and the CAI woke up.

Damn, I wish I had recorded it. This was INTENSE AWFUL ANNOYING sound. Made the car sound like ****. Especially the easy part throttle take offs, up to around 25 mph. And it had a much worse sound, then the tone changed and it was normal CAI sound, but still at much less throttle and a slower speed than I expected.

And why would I hear the CAI groaning at 1200-1400 rpm going 15-20 mph?

So, who hears their CAI and who doesn't under low loads/ low speeds?

I know I'm rambling on, but I really want to figure this out. And I really want the CAI too.
Something wrong somewhere.

I don't hear mine at low speeds at all. I can hear a little whistle sound coming from it when i give it a little punch but thats how it is with all CAI's. I only hear it when i get on above 3k. So no i dont here it under low loads. I know you said you have done a lots of installs but were you 100 percent positive everything was clamped good and all the connections were secure? Sometimes we make stupid little mistakes.

I know you said you have done a lots of installs but were you 100 percent positive everything was clamped good and all the connections were secure? Sometimes we make stupid little mistakes.

Man, I'd love to say my dumb ass f'd something up.:drink:

Believe me, I was so shocked when I first took it out and heard the sound, I came home took it off, put it back on, took 3X too long checking everything as I went, went back out, same thing. Came back, and rechecked again.

I'm gonna put it back on tomorrow and take some sound clips. You have to hear it to believe it. I heard CAI noise from the moment I put my foot on the accelorator at 600 rpm all the way up. And from 600-2000 rpm was ugly. From 2000 to 3000 too noticeable. Above 3500, sounded like it should.

Man, I'd love to say my dumb ass f'd something up.:drink:

Believe me, I was so shocked when I first took it out and heard the sound, I came home took it off, put it back on, took 3X too long checking everything as I went, went back out, same thing. Came back, and rechecked again.

I'm gonna put it back on tomorrow and take some sound clips. You have to hear it to believe it. I heard CAI noise from the moment I put my foot on the accelorator at 600 rpm all the way up. And from 600-2000 rpm was ugly. From 2000 to 3000 too noticeable. Above 3500, sounded like it should.

Ya i would love to hear some sound clips. This sounds way interesting. Maybe there is something possily wrong with the actual contructions of the intake itself. With the stock intake everything sounds good you said?

Mine whistles in the morning when I back out of the garage, I don't hear it any other time. My intake is great, it doesn't cause a bog, it excellerates harder then with the stock intake and you definetly hear it when you get on it, no nasty sounds, however, I built my own and its more like the new era. I love mine and it fits perfect. The Roto looks like a very good product, I haven't seen one up close or heard the sounds your speaking of. So, good luck and I hope you get it worked out. This will be hard to tell, but, maybe the seal is not tight against the hood and your hearing the air being pulled around the seal, that might be louder then just being pulled from under the hood, mine has no box or seal so you just hear it pulling air from the big cavity under the hood. If you put it back on you might figure out a way to check that. http://www.cardomain.com/member_pages/show_image.pl?bg=FFFFFF&image=http://memimage.cardomain.com/member_images/1/web/3049000-3049999/3049754_37_full.jpg

I can't comment on this intake since I don't have one, but some comments on the whistle I'm aware of. If were not talking about the transmission whine here, then the whistle is most likely the air moving past the throttle plate in the throttle body. It's a sound that will change with the engine rpm and usually goes away after 2200 rpm.
However, I hope you get it fixed.

Update, coming back from lunch, (I have stock intake on now) I jumped on it coming out of a stop light. Kick down to 2nd, in Drive, around 35 mph, and it felt like the engine tried to take a big gulp of air. Nothing for a second, then bam, the engine surged forward.

I think I have a vacume or MAF problem. The Rotofab intake isn't broken, fit was perfect. I think whatever I have going on when I had the RotoFab install, getting more air just exasperated the situation.

I didn't touch anything on the MAF when I had it off, I saw 2 small wires inside, then the screen of course. What about a vehicle ground?

Are our transmissions adaptive? Do they learn your driving patterns? My Magnum, with the 5 speed Mercedes auto, after a while would get sluggish with the shifts. You could unhook the negative at the battery, wait a while, then the tcm re-set the shift points, and it started to relearn your driving practices. Ours benefit any from unhooking the negative from the battery? Does anything reset?

Bottom line, I think I have a air/vacume issue SOMEWHERE....

MAN...... I'm bummed

the whistle sound is the altnater kicking in

if its vacuum you should be able to hear it. open hood, start engine, listen really carefully and try to find it.

I have a whistling sound at idle, too, but only when the car is cold. When warmed up the whistling is gone.
Same here, but only for about 30 seconds. I have the New Era CAI.

if its vacuum you should be able to hear it. open hood, start engine, listen really carefully and try to find it.


This is true. I was thinking that maybe a hose is not all the way on so it might not be as noticeable.

You can check the seal on your CAI fit with the hood the same way we check airtight doors on ships. Take some chalk and rub it along the top edge of the rubber seal and close the hood. Reopen the hoop and check for a solid line. Any place you have a break in the chalk line on the hood you also have an air leak. BTW if you don't have chalk you can try dusting some baby powder on it with an acid brush.

Good luck.

I have this sound too. Somewhere on this board we did discuss this. In my case, it IS NOT the CAI. I had the sound and bogging down before and after the CAI was installed. I believe this 6L takes a long time to come up to proper operating temp. Possibly because of the nice size radiator and large oil pan. I believe the sound is simply a car not warmed up (until about 10min) adjusting the timing and whatever else the ECM does to keep the motor running. In my case it does start to run properly (Great for a large V8) once proper operating temp is reached. Does your car ever straighten out?

This is true. I was thinking that maybe a hose is not all the way on so it might not be as noticeable.

3 feet of 1/2" fuel hose, the ultimate ghetto stethoscope :)

3 feet of 1/2" fuel hose, the ultimate ghetto stethoscope :)

my car is the same way I was wondering when someone was going to post up on it. When its cold in the morning, it semi bogs then picks up, really odd, but I can see that its mainly when its cold. I have the stock air box as well.

Okay, whatever extra noise is evident with Roto-fab will ultimately be worth it as mine, (minus any other mods, yet) definitely runs much better WOT. I am awaiting Summit to deliver my Magnaflow setup and for the pcm reburn to make it all harmonize. Didja forget how quiet the thing is stock? Just like the law of inertia, change one thing and affect another.

Oh yeah, regarding the whistle, I concur that we have the sound of an unmuffled alternator going into field.

and it felt like the engine tried to take a big gulp of air. Nothing for a second, then bam, the engine surged forward.


These cars have that crappy drive by wire, so you wont get the throttle response you will with a cable throttle body. It lags at first. I personally hate that aspect of the car but that is the only thing!!

Are you postive the connect in red was fully sealed? I know this was a bitch and a half to get on for me. Was very very tight.

Are you postive the connect in red was fully sealed? I know this was a bitch and a half to get on for me. Was very very tight.

That looks like a plastic nipple too, could it be cracked? That's a big hose, a leak there could very well be the answer.

First off, thanks for all the feedback! Really appreciate it.

Here's where I am. The sound is definately there with the stock box, you are right, it's so quiet you don't really hear it, but you feel it. After work last night, ready to go home, have a 45 min drive. Started the car, put it in reverse to back out and the car stalled.

Started back up, and as I was leaving town, stop and go, the thing was slugish as hell. So I started getting mad. Once I had my country part of drive (divided 4 lane, last 30 min of drive) I decided what the hell. So I started running the hell out of the thing. From 30 mph, slammed to the floor. Went to Sport Mode, then Manually shifted for a while, going quite a bit to redline. (this is from 30 to 60 mph) Then back to Auto. From a couple stop lights, floored it from start. Bog was very noticeable. Basically ran it like it was someone elses for the rest of the way home.

When I would jump on the gas, there was a second or 2 delay before the thing would downshift and take off.

All of a sudden, the bogging gets less noticeable. So, I ran it harder. All of a damn sudden, I hit the gas, the car takes off like stink, no bog. Rest of the way home, car felt like a different animal.

Got home, pulled in garage, disconnected negative battery, and in a new record 15 minutes had the stock box off and the RotoFab back on. Hooked back up the battery, took it out, and NOW IT SOUNDS LIKE IT HAS AN INTAKE. HELL YEA!!!

SO, I don't know what is going on, or what happened to fix it. I think my biggest issue is the shifting of the transmission, the delay in downshifting from slow revs.

Coming to work today, everything still cool. Now I hear the intake like I should. At low revs, the drive by wire is still there, and I still hear a little of the moan but I agree that it may be a product of the car.

I get the 8150 ecu update done Monday, so hopefully that will help.

My best educated guess..... Running the **** out of it fixed it.??? Nah, I still think I have an issue there, hopefully the tune will fix it.

It reminded me of the old days, it needed the carbon blown out of it... :)

My best educated guess..... Running the **** out of it fixed it.???

You would be supprised.

My buddy was a service writer at a Cadillac dealership and told me that people would bring their 4x4 Caddy trucks into the shop complaining about transmission whining. The problem was that they were not using 4-wheel drive, only the rear 2. So the solution they found was to drive around in 4 wheel drive. That solved the issue.

On my last car (04 DTS), the AC would stop blowing cold air. I found the solution was to slow down, then punch it up to around 80. As soon as I would hit 80, the air would cool back down.

Maybe your car was adjusting to the new CAI and needed to be driven hard? Question is will the bogging come back over the weekend.

I also don't like the shifting of the transmission. This will be my first complaint once I get back into the dealership. I had it pause while I was pulling across 4 lanes with traffic comming. Not the best time to happen.

I have the update and havent noticed one change. The lag is still there. Is it the trans or is it the lag in info from the drive by wire TB?

We can only hope that GM listens, especially since all the mags are praising this car, and all of them are pointing out the lousy shifting.

I see everyone doing the Vector tune. I for one, don't want to run premium (I have to fill up every 2-3 days as I drive 7-800 miles a week), I don't go to the track, I don't really need another 30 HP.

But couldn't someone offer a tune that didn't need premium gas that specifically addressed the shifting issue? And maybe removed the speed limiter?

I think if Vector or someone did, I think there would be a BIG market for it. Let's say you get 60-70% of the benefit's of their Premium tune, but didn't have to rum Premium gas. I would be thrilled with the car performance wise if the shifting was fixed.

Hey tuners, anyone listening???

I think you can just get the TCM tune for your tranny using Vectors FlashXpress and you don't have to do the ECM tune. If you both ECM and TCM, tell them you want to stay with 87 or maybe 89 (if there is any benefit) and they will fix you up. They are great to work with.

SO, I can do just the TCM? Or I can get the TCM and the ECM and they can tune for 87 or 89?

Man, I didn't know that!!!! I'm excited as hell now. I emailed them, can't wait to hear back.

Im glad running it hard took care of a problem lol. Seriously though im happy for ya. Yes you can get just the TCM tune. When i watched them do to my car at there shop they open up 2 different files. I would call them up just to make sure though. O never mind just saw that you emailed them lol

JUST CAME ACROSS THIS THREAD...IM ABOUT TO GO OUT TO MY PARKING LOT FOR LUNCH AND PUT THIS FUKER ON...I RANDOMLY JUST SAW THIS thread and it gave me alittle apprehension...
The directions look good...but more steps involved than I thought lol
Im going out now to put the ROTofab on in the employee parking lot lol Fck it I cant wait to get home..
I hope I dont run into any bog problems on top of the "hesitation" it already has ...
I also at times have more bog than others..than Other times...It has no bog and runs like a Raped Ape....
Runs "tits" as my decade old gear head buddys made up lingo would say...
other times..I get pissed...that it seems to lag for no reason..
oh well screw it..im going to put in on right now.
wish me luck
G8 JOe in cali

I'm getting the hesitation with stock intake and exhaust, so +1 for the crappy trans or whatever is causing the problem. I have an email into Chris at VMS to see if there have been any enhancements to the tunes. The TCM update definitely firmed up shifts and made the car feel a little more sporty, but the lagging is killing me!

Hey drob8 those numbers accurate in your sig? You just have the tune? Just curious guess im trying to get a ruff estimate to what im putting down at the wheels

I put my RotoFab on Friday at work...took like over an hour during lunch , I went slow to make sure everything was done right the first time...
I really like the sound it makes at WOT, it sounds very aggressive and adds to the "bark" in addition to flows I put out in rear. When driving the car under part throttle, I dont notice any additional noise or volume, as you get into it past half throttle it starts to wake up.
It feels alittle quicker down lower ...earlier...
WIth the traction control on.....it seems to "scratch" the tires more than before indicating a power improvement......

K.. From the start of owning the vehicle I noticed a "lag" at takeoff...The traction control maybe???
The fact that the rpms are so low at idle and tha car seems to "lope"???
The CAI might just be amplifying that feeling. The whistling noise is common for CAI's in every car I have installed one in. Tends to be more predominate at take off. Its just that now you can hear it sucking air and breathing like its supposed to.
THe CAI on my 06 mivec v6 Eclipse did the same thing.

I'm getting the hesitation with stock intake and exhaust, so +1 for the crappy trans or whatever is causing the problem. I have an email into Chris at VMS to see if there have been any enhancements to the tunes. The TCM update definitely firmed up shifts and made the car feel a little more sporty, but the lagging is killing me!

Drob8: Let me know what you find out. You could either post here or PM me if they've come out with any updates to their ECM or TCM tunes.



...

Sounds to me like the bogging sound was AFM kicking in. Driving aggressively made the AFM kick in less?

The shift lag annoys me too.

My Roto-Fab went in easily and works great. The hardest part of the install was getting the 3/8 rubber hose pushed on. I don't notice anything at low RPM but when you get on it you can really hear and feel the difference. At WOT I can only describe it as a "howl". I love it!

It reminded me of the old days, it needed the carbon blown out of it... :)


Tiger,

GM PCM stock tunes learn the drivers driving habits. They use alogorithms to maximize fuel economy using driver habits. Therefore if you drive your car like a regular day it will shift the fuel trim and fuel maps to conserve fuel. However once a more spirited driving experience starts to take place of a few minutes of WOT - the fuel trim shifts to a more rich map - therefore causing more fuel consumption therefore giving a more responsive drive.

Also the trans shifts in the stock GT are horrendous and that is one thing I wish to change on my vehicle. The delay in shifts and lack of response makes the driver feel less in tune with the vehicle - especially in manual mode.

If you get a tune the shift times can be crisper and you can advance timing etc - but at a cost of higher fuel consumption.

If you are worried about fuel consumption - maybe you shouldnt have purchase a 6L motor. No offense.

Side note - I just got my Rotofab CAI from Livernoise.

UPS duty bent me over hard $90.06 CDN. This is a 500 dollar CDN intake - hope its worth it.

Going to tinker on it tomorrow - Install manual has ok photos and too much wording.

Sounds easy enough.

:wink2:

I believe all of the L76's whistle at startup, as noted previously by other posters. Vacuum noises, I think, all normal. It's big performance engine with a myriad of gee gaws on it for car use and gas savings etc., and it makes odd noises, in my experience.

Here is my take on it.

The Roto fab should not cause a bog or sound as such. The whistle is normal and I think all the g8s have it. I think it's just the air whistling in the throttle body, made more apparent with the intake. The alternator sound is less of a whistle and more of a whine, two different sounds.

First thoughts on you situation is that you have a dirty mass air flow sensor. Some times the filters come over oiled from the factory. Run your finger in the intake tube, any oil residue? If so it's on the sensor too and you should purchase some maf sensor cleaner to take care of the issue. Could also be you got some thing on it with the install and when you ran it hard the faster flowing air cleaned it up some? Either way I would spray it with some cleaner.

I changed my filter on the rotofab to a Amsoil filter to avoid the issues with the sensor.

Orange,

The Roto-CAI does pull a massive amount of air through it and I know what your talking about. On mine, it is more of a "Sucking" sound but it is not annoying to me...it actually sounds MEAN! I have Magnaflows out back. I know you have an H-pipe...so do I... but are you running the stock Mufflers?

I don't know if that will or won't make a difference, but flow is flow IMHO, and the less restrictive you can get the better. A "Tune" might clear it up and I'm told the ECM is is ridiculously touchy and doesn't like MODS. A VCM HSRK is on order for me, and again...not sure if it is relevent, but managing heat along with airflow might be a valid take on this issue.

Trying to think outside the box. I'm no mechanic, just a hobbyist.

Good Luck...This forum will get your baby healthy again!

Since this thread seemed to have been revived after about a one year hiatus, was there ever any solution found?

Here is my take on it.

The Roto fab should not cause a bog or sound as such. The whistle is normal and I think all the g8s have it. I think it's just the air whistling in the throttle body, made more apparent with the intake. The alternator sound is less of a whistle and more of a whine, two different sounds.

First thoughts on you situation is that you have a dirty mass air flow sensor. Some times the filters come over oiled from the factory. Run your finger in the intake tube, any oil residue? If so it's on the sensor too and you should purchase some maf sensor cleaner to take care of the issue. Could also be you got some thing on it with the install and when you ran it hard the faster flowing air cleaned it up some? Either way I would spray it with some cleaner.

I changed my filter on the rotofab to a Amsoil filter to avoid the issues with the sensor.

Great tip! I'm really struggling with the "Chugging" issue everyone's talking about and I will clean the MAF this weekend and change the Filter if necessary. Do you have some additional web site info on Amsoil? Of course, I can google.

Thanks again! :)

do you have a tune?

do you have a tune?

Not yet...looking at the VMS Cable set-up for $250.00. I'm think this might be the way to go...your thoughts?

i think this sound is quite annoying on the highway actually...much worse than any drone my exhaust might have

What are you guys talking about? I dont hear s@!t when I drive!! LMAO!

What are you guys talking about? I dont hear s@!t when I drive!! LMAO!
Me too. I don't hear anything until I'm over about 40% throttle, at which point it sounds fantastic though!

i only hear it when the AFM turns off as i'm pushing harder on the pedal and it sounds kinda like a popping noise. maybe it's different from what they're saying in this thread

mine sounds perfect.....no "bogging"

Side note - I just got my Rotofab CAI from Livernoise.

UPS duty bent me over hard $90.06 CDN. This is a 500 dollar CDN intake - hope its worth it.

Going to tinker on it tomorrow - Install manual has ok photos and too much wording.

Sounds easy enough.

:wink2:
IT'S CAKE...TRUST ME! IF MY NON-MECHANICAL SELF CAN DO IT YOU CAN!

Some tips:

Watch you don't drop your 10MM socket down the Filter Housing like I did.
Zip tie the 3/8 inch hose for security
Don't overtighten anything until final check
Make sure your Elbow is FULLY seated against the TB inlet
Rotate your MAF sensor downward so the engine cover goes back on
Use a Torx Bit set to secure torx heads and not a FH Screwdriver.

Took my triple checking paranoid A$$ about 1.5 hours

Good Luck!

Great tip! I'm really struggling with the "Chugging" issue everyone's talking about and I will clean the MAF this weekend and change the Filter if necessary. Do you have some additional web site info on Amsoil? Of course, I can google.

Thanks again! :)

The Amsoil part number is EAAU6065-EA. Perfect fit but it's a bit pricey. I had to sign up to be a dealer to get a discount on it LOL. I still have not even opened the info pack on being a dealer, just wanted the discount. You can check the amsoil web page and type in your zip code for local dealers, that's what I did.

Anyway it seems to work well, might have been a little more pep to the car but I could have been imagining it. I did gain almost 2 mpg though with the switch though the K&N was a little dirty. I had not ever cleaned it and I think I had it at least 6-9 months old.

The car still whistles the filter is not going to change much of anything other than you will not ever have to oil it when you clean it.

Does it happen when the car is in the middle of a downshift and then you lightly hit the throttle to accelerate? If that is the case, mine makes this sound. It almost sounds like a low pitch grunt. Maybe AFM, IDK?

i only hear it when the AFM turns off as i'm pushing harder on the pedal and it sounds kinda like a popping noise. maybe it's different from what they're saying in this thread

^^^^^I think this is what I am talking about.

Installed the intake. Took 2 hours in the hot sun. Sounds great after 2500rpm. Stock sounding besides that for the lower end rpm.

No issues.

Make sure your Elbow is FULLY seated against the TB inlet

you mean the elbow should be pushed up against and touching the TB inlet? i left a gap so the rubber coupling allowed the elbow to move in and out from the TB inlet. should i not have done that?

you mean the elbow should be pushed up against and touching the TB inlet? i left a gap so the rubber coupling allowed the elbow to move in and out from the TB inlet. should i not have done that?

The last page on the instructions state "It is IMPORTANT to ensure that the inlet elbow is fully seated against the Throttle Body". I would not leave any gaps, but call Mike @ ROTO and he'll walk you through it.

I cut off my zip ties on the 3/8 inch hose and secured with baby hose clamps instead. Took some time, but I feel safer and it looks a lot more professional.

Glad everything worked out!

Anyone know of a non oiled filter we can use in place of the oiled one that comes with the Roto-Fab? What about AFE pro dry? if so please include brand and model number.

Anyone know of a non oiled filter we can use in place of the oiled one that comes with the Roto-Fab? What about AFE pro dry? if so please include brand and model number.


Look at post #73

deleted

Here's a question for all, how many of you really hear the CAI under normal driving? If you're not punching it, do you hear it? And if you do, does it sound like crap? Does it make you want to look around and see if anyone is looking?

Especially from a start to say 35-45 mph using normal throttle, do you know you have a CAI on? Any CAI I've ever had, I really didn't know I had one installed until I got in the throttle a little bit and the rpm got into the power band.

My Hemi Magnum, K&N Intake, under normal driving, you didn't know a CAI was there. Then you punched it and the CAI woke up.

Damn, I wish I had recorded it. This was INTENSE AWFUL ANNOYING sound. Made the car sound like ****. Especially the easy part throttle take offs, up to around 25 mph. And it had a much worse sound, then the tone changed and it was normal CAI sound, but still at much less throttle and a slower speed than I expected.

And why would I hear the CAI groaning at 1200-1400 rpm going 15-20 mph?

So, who hears their CAI and who doesn't under low loads/ low speeds?

I know I'm rambling on, but I really want to figure this out. And I really want the CAI too.
Something wrong somewhere.

I can actually hear my CAI under a certain amount of throttle, at any speed, you can hear it really sucking in air. Almost like someone sucking through a straw or something...give it a little more throttle, it goes away. Sounds awesome. I didnt have ANY of the problems youve described. Only problems Ive had were the intake pipe popping off the throttle body, or intake pipe popping off at the filter because of motor torque. I fixed it, hasnt happened in awhile.

So guys and gals, I'm surprised that no one recommended plugging a reader into the ODBII port to see if there was a code related to the bogging. Besides actually finding something not connected, something cracked or broked, it is very hard to troubleshoot modern computer controlled engines otherwise. So just to add to the speculation about the OP's problem, I'm thinking that the TB butterfly or the actuator was sticking (either momentarily completing stuck or slowly moving in a particular section of its movement). Flogging it about with the repeated throttle stomping seems to have worked "the stick" lose. After that, I can only point out that it is a red GT and the engine cover was missing ... ;-)

OrangeTiger, my car makes the whistle when I first start it on a cold morning, but I NEVER hear it anywhere else. Maybe when they made the GXP they corrected this problem, I don't know.

But if you are still having this problem, you could always send it to me or someone else, have them install it, record it, see if the same problems are there, and then they can send it back to you and you would then have a good verdict. I would pay return shipping if you sent it to me. Just a thought... I am all stock in my GXP

I have recently gotten the whistle. No loss in performance, haven't had time to look at it. It will only happen from about 2-2600RPM. Only will happen when I give it WOT, but will happen in any gear. I think it is some type of PCV or manifold leak somewhere. Hasn't been a major issue, but it whistles everytime WOT 2-2600 in 1st, 2nd, 3rd, and beyond. Will happen at any speed too.

Does it sound like a bird is in their literally chirping?