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Bilstein shocks, King SL HD springs, K-Mac strut bushings

9501 Views 37 Replies 9 Participants Last post by  JonRobbinSS
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Today was the big install day started about 8:30 this morning and finished cleaning up the garage around 4:30 - so not too bad.

I did do the build up of the front struts prior to starting the job today so that saved a good bit of time, and to do that I had to buy a second set of used FE2 struts for donors from a member here and a new top plate from Greg at Pace to allow me to build the struts and not have to take apart the stock FE3 today (it also let me keep the FE3 stuff.. In case..)

King P# for front spring: KHFL-150SLHD
King P# for rear spring: KHRL-152SLHD

Stut build up was pretty straight forward, welding the collar on the strut bodies was about the hardest bit. And even that wasn't too bad, cut as high as you can on the strut body and slide the Bilstein insert threaded to within about a 1/8" of being fully seated on the threaded collar to allow you to fully tighten the insert with good thread engagement, it also allows for better placement and alignment of the parts. I then spot welded the collar in place, took out the insert and fully welded the collar in place. The bodies then went to the powder coater to get cleaned and coated.

The K-Mac upper adjustable bearings are pretty nice pieces but there were some manufacturing issues that were irritating after paying that much, a half-hour with a file and then having to remove and clean the bearings due to the filings and the issues were solved (the slot for the 1/2 drive to rotate the bearing was too small to take a 1/2" drive), I also found the metal bearing built into the unit had 42 balls in one and 35 in the other (now they have 38 and 39) K-Mac appoligized but said there should be no issues with my solutions.



When the the strut bodies came back from the coater and the upper spring perch arrived from Greg at Pace Performance, I put the struts together. No issues there, I did leave out the upper rubber spring isolator in the hope this would get my front and rear heights closer. I am pretty happy with how the struts turned out.


So today the front struts went on quick and the most time was spent disassembling and reassembling the rear strut bodies. The Bilstein rear shocks have three height choices for the lower spring perch. I chose the upper most one and this time did add the top spring isolator hoping for a little more height.


After this was done I mounted up my new TSW Nuerinbergring 18x9.5 rims sporting a set of Toyo R888 275/40-18 tires. Due to the width and offset (+40) I set the front camber to as close as I dared to the strut body.. This was most of the reason I went with the K-Mac upper bearing - hoping to get some of this lost camber back but allowing me to run a square tire and rim set up.

After it was all done and I drove a few miles to settle everything in my ride height from the center of the wheel to the fender is 280mm front and 275mm rear. So pretty close. We will see how it goes after a few more miles.



Tomorrow will involve a stop at an alignment place to get the car dialed in and to see what settings are possible. Also a little quality time with a rear fender roller might also be in the future. We shall see.

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Pics please!
All that and no pics?? hahahaha

Oh and BTW, maybe we can meet up next time I'm working in San Diego and I can get a ride in your car and see if the Bilsteins are worth it to me.
All that and no pics?? hahahaha

Oh and BTW, maybe we can meet up next time I'm working in San Diego and I can get a ride in your car and see if the Bilsteins are worth it to me.
I know, but I hate stopping a good wrenching session for photo time.. I will get some tomorrow for sure.

Just lemme know when you are coming down. My next autocross is March 3rd at Qualcomm stadium, should be a good workout for the setup.

I am looking forward to the commute in the morning to compare this setup to my stock FE3 stuff. After the alignment is done tomorrow I will swap back to my RE-011 and stock GXP wheels to check on road noise differences between the setups.

I can already tell the R888's are a louder running tire.
I know, but I hate stopping a good wrenching session for photo time.. I will get some tomorrow for sure.

Just lemme know when you are coming down. My next autocross is March 3rd at Qualcomm stadium, should be a good workout for the setup.

I am looking forward to the commute in the morning to compare this setup to my stock FE3 stuff. After the alignment is done tomorrow I will swap back to my RE-011 and stock GXP wheels to check on road noise differences between the setups.

I can already tell the R888's are a louder running tire.
Oh Im with you on the stopping to take pics... I'm terrible with that. I was talking about a post-install set of shots.
And yeah the R888 are gonna be louder for sure. I think I'll be down there sometime in the next 2-3 wks. Where about in SD are you? When I'm down there I usually stay at the Holiday Inn right next to Miramar off the 15 or I stay up near San Marcos area also off the 15.
A friend of mine who lives in Vista turned me on to a cool lil thursday night car meet up in the northern area... near Encinitas. I think its call Tacos & Tuners... https://www.facebook.com/pages/Tacos-Tuners/162259780458485?fref=ts

if you're near that area maybe we can meet there.... its not a bunch of ricers doing burnouts...believe me, me and my buddy are way too old for that crap. hahaha
Pictures added to the first post.

Going in for the alignment in a few hours and the fender rolling is scheduled for next Tuesday due to a slight rub in the rear.
Oh Im with you on the stopping to take pics... I'm terrible with that. I was talking about a post-install set of shots.
And yeah the R888 are gonna be louder for sure. I think I'll be down there sometime in the next 2-3 wks. Where about in SD are you? When I'm down there I usually stay at the Holiday Inn right next to Miramar off the 15 or I stay up near San Marcos area also off the 15.
A friend of mine who lives in Vista turned me on to a cool lil thursday night car meet up in the northern area... near Encinitas. I think its call Tacos & Tuners... https://www.facebook.com/pages/Tacos-Tuners/162259780458485?fref=ts

if you're near that area maybe we can meet there.... its not a bunch of ricers doing burnouts...believe me, me and my buddy are way too old for that crap. hahaha
My wife is in nursing school and I am home with the kids on Thursday nights. I live down in Chula Vista and work up at Point Loma. Maybe we can get together for lunch when you are down this way next.
Okay, being the only person on the board that I know of with Bilsteins, you have to give a long detailed review of them compared to your FE3's. I believe they will be much more compliant but better controlled. Share!!
K-Mac, I talk to that guy every SEMA, send him all the feedback you can so he can fine tune his product!
Okay, being the only person on the board that I know of with Bilsteins, you have to give a long detailed review of them compared to your FE3's. I believe they will be much more compliant but better controlled. Share!!
K-Mac, I talk to that guy every SEMA, send him all the feedback you can so he can fine tune his product!
Vz28 and TheStevo both beat me to this with Vz28 running Bilstiens with Eibach springs (I believe) and TheStevo running his with Kings Standard duty SSL front and SL rear. Both of them were nice enough to answer my questions so I could avoid making any rookie mistakes when putting it all together. I was really hoping to get it right the first time (hate TTY hardware).

I am going to hold off on the detailed comparision until after my first autocross on March 3rd. That is were I will really be able to tell the differences. And it is really hard to say which change caused what when you do a multi-part swap like I have (smaller diameter wheel, bigger sidewall R-comp tire, stiffer shocks and springs, removing the upper spring isolator and using the K-Mac bushing and metal strut bearings). So any review will be on the package - although I will try to give street driving impressions tomorrow now that I have swapped back to my GXP rims and RE-011 tires.
It went well at the alignment shop today. My eyeball must be well calibrated - with the car empty I had -1.6 to -1.7 on all four wheels and +6.6 caster on both front wheels when we started. We only had to make some small toe adjustments (I like them set at 0 with me sitting the car) and a minor camber change due to my weight in the car.

Out of curiosity I ran the K-Mac through its range and it went from -0.5 to -1.7.. A pretty good adjustment range. And as you reduce the negative camber using these strut bushings our cars create toe in - in fact, adjusted all the way down to -0.5 leaves the toe settings firmly in the stock toe in setting range for the G8 (not that I would ever use those) nice to know it is possible.
Road driving impressions from swapping from the stock FE3 setup with 27k miles to this setup running my standard GXP rims and RE-011 tires..

Nice, you can tell the King HD springs are stiffer but not punishing in any way. I do like a stiff riding car so YMMV and so far I like how well this combination passes the feel of the road to the driver. I drive this type of car because I love cars and driving - anything that gets me more feel for what the car is doing is a plus for me.

The Bilsteins seems to be a good match to the King HD springs and as far as I can tell so far are able to dampen the springs well both in the slow and fast oscillations found during street driving. I will need more seat time and the next autocross to fully answer this one.

I tend to take corners fast and even on my street tires I tend to wear out the outsides of the tires first so I keep my race alignment settings on the car all the time. With this set-up I was able to up that negative camber from about - 1.4 to -1.6, not a big change but at least one in the right direction for my driving style. This limit is mostly due to the 18x9.5 +40 rims. If I was to run stock size wheels and tires with this set up I would estimate it could go all the way to -2.5 and be able to dial back to -1.5 for the street using just the K-Mac strut bearing (but of course then I would need to work on the rear since the stock arms are maxed out at about -1.7)
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I have been running the Bilsteins since late last year so I do have a bunch of miles on them. I can give you guys a full report in another thread if anyone is interested.

JonRobbinSS nice writeup and setup is looking good! :)
Just as a comparison for others I will get you my front/rear heights (Eibach, Bilsteins at middle perch on rear, oem front mounts) later, I believe I measured from bottom wheel lip to fender however. Your pics make me think I am probably 1" lower in the rear and 1/2" higher up front.

As you probably already know, the more camber you can tolerate up front the better - I am at -1.9/-2.0 (pass/driver front, stock tire size) and it was a very noticeable increase in grip from previous setting of -1.4. That leaves me with ~1/4" to the strut on both sides with my setup.

Enjoy and let us know how you like it!

EDIT: I finally got around to taking ride height measurements for comparison - and hopefully Jon will provide an update on how he likes his setup and any adjustments he has since made.
My setup, which consists of new OEM strut bushings (install was 3-5k miles ago), Bilsteins with rear perch on middle height and Eibachs, has the following ride heights: DriverF 25 1/8", PassF 25 2/8, DriverR 24 2/8, PassR 24 6/8.

Measurements are +/- 1/8" as they were quick, 3/4 tank of fuel, empty trunk, stock 19" GXP rims, -2.0f/-1.5r camber in case you are comparing. Less rake than stock, driver rear lower than pass rear, handling and balance is excellent but I might want to raise the rear to allow for more travel.
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Added my ride height information for comparison's sake. See my previous post.
I still have the same driving impressions of my car using the King SL HD springs and Bilstein shocks. I am really liking the daily driving and increased road feel.

The only thing I might wish for is a little higher rebound setting on the rear shocks. But it isn't enough of an issue to pull them out and get them re-valved. Maybe when they are due for a rebuild a couple of years down the road..

Since this install I have also done two more modes to the car.
BMR sways - Link to thread
And CTS-V brakes - link to thread

The additional roll control of the sways and brakes has been a good thing to the overall performance of my family car.

I just went out and remeasured my set-up's ride height using Vz28's method. Same conditions as his other than my camber setting s are -1.7 all around, same wheels. Fronts both measured 27 3/4 inch and the rears both measured 27 inches.
I added a few new pictures on the car sporting the Nurburgring wheels and tires on my CTS-V brake install thread... It also shows the current ride height of the car after two months of settling and might be of interest.

Link to post
I just went out and remeasured my set-up's ride height using Vz28's method. Same conditions as his other than my camber setting s are -1.7 all around, same wheels. Fronts both measured 27 3/4 inch and the rears both measured 27 inches.
These measurements were bothering me considering we should have about the same overall tire diameter. Any chance you measured from ground to fender instead of wheel lip to fender? If so my quick rough measurements are much closer (27 5/8 driver front, 26 3/4 driver rear, 27 3/4 passenger front, 27 1/4 passenger rear).

I should have taken the proper wheel/tire-independent measurement (finding wheel center and measuring to fender) in the first place :)
^^ yep ground to fender for me.. So we are pretty close.

My original measurements were center of wheel to fender in millimeters. I should redo those since they were only 5mm different front to rear and now I am at 3/4 inch different when measuring to the ground.. Hmmm..
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Broken Rear Shock

One of my Bilstein shocks broke last week. The entire bottom bracket broke off on either side of the welds to the shock body. Crap...

After calls and emails to Australia, Germany and a few trips to the local Bilstein Poway facility the consensus was there is no warranty on the shock and a replacement from Australia would cost me $400+...

I did find another offering available in the US, they have a new fitment for the Camaro that looks like it will work for us (in the rear). And for a little more than $100 each, even available from Tirerack.. I picked up a pair today and plan on making the install this weekend, but they look good. They are a little stiffer in compression and a little less in rebound, so might be good on my King HD springs.. Hopefully.

Attached a quick photo of the broken shock with the new one beside it






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Never seen a shock break there. I wonder if the bushing was binding or something.

What does the top of your rear spring/shock mount look like? It has to be able to pivot a bit, as the bottom of the shock moves laterally as the suspension compresses.
FYI - we're getting very close to being able to put height-adjustable coilovers on these shocks (since they're the same as Konis). Talked with GC yesterday, and they think they have everything needed.

Of course, that means getting rid of the King springs, but you'd be able to install coilover springs in a custom rate and adjust the height easily.
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