OK, starting to worry a little bit about my tranny here. :D

Has anyone done the research to see how strong this tranny is, what the weaknesses are and what aftermarket parts are available?

I believe GM rates the tranny to 430 or 460ftlbs.

aren't they putting this same trans in the 550HP/TQ CTS-V??? GM only rates it to those 469 HP b/c of the STS-V, they haven't used it in anything more powerful than that, til the CTS-V...

We have numerous corvettes putting out right around ~600WHP with the 6L80 without any issues (yet). The big thing is to NOT turn torque management off at this power level, unfortunately commercial software only has on/off switches for it while our software allows us to fine tune it rather than eliminate it. I'd say if you leave your TM on it'll probably live for quite awhile.

We have numerous corvettes putting out right around ~600WHP with the 6L80 without any issues (yet). The big thing is to NOT turn torque management off at this power level, unfortunately commercial software only has on/off switches for it while our software allows us to fine tune it rather than eliminate it. I'd say if you leave your TM on it'll probably live for quite awhile.
Good to know. :p

Thought I read somewhere that the new Supercharged CTS-V for 2009 has the heavier version of the 6L80 (?9L80?). Not sure what else this heavier tranny is used in. Anyone know???

RRM

Thought it was a 6L90?

We have numerous corvettes putting out right around ~600WHP with the 6L80 without any issues (yet).

You also need to keep in mind that the G8 is around 800lbs heavier than a C6. :(

You also need to keep in mind that the G8 is around 800lbs heavier than a C6. :(

Of course :) But its also making well over 100wheel hoserpower more than most of G8 owners will do as well.

Thought I read somewhere that the new Supercharged CTS-V for 2009 has the heavier version of the 6L80 (?9L80?). Not sure what else this heavier tranny is used in. Anyone know???

RRM

6L90 is also used in GM truck applications as a heavy duty tranny. And you are right, the 6L90 is the tranny in the CTS-V.

Chip

6L90 is also used in GM truck applications as a heavy duty tranny. And you are right, the 6L90 is the tranny in the CTS-V.

Chip

I thought the 6L80E was in the CTS-V and the 6L90E was in the STS-V.

6L90 is in the cts-v...

http://blogs.gmhightechperformance.com/6228814/gm-news/2009-cadillac-cts-v/index.html

Cool, thanks.

I have the number one position at a FL dealer for an 09 CTS-V, we'll see what happens.

We have numerous corvettes putting out right around ~600WHP with the 6L80 without any issues (yet). The big thing is to NOT turn torque management off at this power level, unfortunately commercial software only has on/off switches for it while our software allows us to fine tune it rather than eliminate it. I'd say if you leave your TM on it'll probably live for quite awhile.


That's good info. I'm planning on buying a G8 in 09 after my GTO is paid off and have every intention of making an Australian super car out of the G8 with an APS twin kit. APS shows 577 rwhp and similar torque on a 6 speed Holden model. I'm thinking that 540-550 with the right tune would be possible with an auto transmission and I'm liking the fact that this trans has seen that kind of power and held up.

The A4 in the GTO's was like lunch meat to the APS twin kits.

We have numerous corvettes putting out right around ~600WHP with the 6L80 without any issues (yet). The big thing is to NOT turn torque management off at this power level, unfortunately commercial software only has on/off switches for it while our software allows us to fine tune it rather than eliminate it. I'd say if you leave your TM on it'll probably live for quite awhile.
That was going to be my question to you. Is it good to turn off torque management ???
I was reading an article in GM High Tech magazine about these guys in NJ running low 13s in the quarter. Here's the tune they used:
timing set to 24
air/fuel to 12.5
shift points at 6300 with rev limiter at 6500
Torque management was removed and line pressure was increased
fans set to come on at 190 degrees

So you're saying its not good to turn off torque management ???

That was going to be my question to you. Is it good to turn off torque management ???
I was reading an article in GM High Tech magazine about these guys in NJ running low 13s in the quarter. Here's the tune they used:
timing set to 24
air/fuel to 12.5
shift points at 6300 with rev limiter at 6500
Torque management was removed and line pressure was increased
fans set to come on at 190 degrees

So you're saying its not good to turn off torque management ???


No, its plain crazy. Unlike the 4 speed series transmissions in which TM was an afterthought added to hopefully increase longevity, TM in various forms is an integral part of nearly EVERY shift calculation in the 6L series. For comparison we have a customer with our tune a rotofab and a UD pulley that runs 12.7's with over 50% of the TM left in the transmission :) So you CAN go fast and keep the tranny in one piece!

Of course :) But its also making well over 100wheel hoserpower more than most of G8 owners will do as well.

Hey, Hey, Hey! Never mind I see the "most " now. :driving:

Does anyone recommend adding an external transmission oil cooler?

I've intalled B&M oil coolers and synthetic oil on every automatic transmission car I've owned from a 3800 LeSabre that went 300,000 miles on the original tranny and still went strong to my Norsthar Deville and my turbo Grand National.

Has anyone done the same for the G8?

I will add one when I change converter

I will add one when I change converter

Thats the way to do it!

What is a safe range for tranny fluid temp?

What is a safe range for tranny fluid temp?

180-200. You never want trans fluid too cool either.

What is a safe range for tranny fluid temp?

I had a very good transmission guy recommend 165-180 for longer lasting life. That was a while ago though.
But I still like that range. :drink:

Cheers!

hi all,
i had my box upgraded from an LS1.com.au froum sponser called Sureshift automatics.
he basiclly pulls tranny apart and replaces many parts and packs up the clutches,
add this to the tune that fellow sponsor Oztrack does and you have a box that shifts as good as an A^ audi box,no lag no slop,just a fully useable tranny that wil stand up to the pressure of a 2.2 SC.my car makes 550 HP at the wheels and it has come up trumpos after 3 months.
im sure anyone wanting to have this done it can be arranged
cheers

I had a very good transmission guy recommend 165-180 for longer lasting life. That was a while ago though.
But I still like that range. :drink:

Cheers!

I've run pretty good sized coolers on all my automatic cars and have never had an issue one way or another. Even when I lived in the Midwest during well below zero temperatures.

I've run pretty good sized coolers on all my automatic cars and have never had an issue one way or another. Even when I lived in the Midwest during well below zero temperatures.

I'll have to see if the Engineering Mode has a trans temp readout. Here in FL it is 95F a lot, so I wonder how hot the trans is getting.

I'll have to see if the Engineering Mode has a trans temp readout. Here in FL it is 95F a lot, so I wonder how hot the trans is getting.
The engineering mode does have a trans. sump temp readout. It is in centigrade so you'll hve to do the conversion. If you go to Google and enter centigrade to fahrenheit conversion you can print out a complete table of the conversion from 0 degrees to 100 degrees C.

The engineering mode does have a trans. sump temp readout. It is in centigrade so you'll hve to do the conversion. If you go to Google and enter centigrade to fahrenheit conversion you can print out a complete table of the conversion from 0 degrees to 100 degrees C.
So much for that metric/standard option on the DIC! I had noticed that that option does not affect the trans sump temp readout being in Celcius.

So much for that metric/standard option on the DIC! I had noticed that that option does not affect the trans sump temp readout being in Celcius.

Yes..that's right. Sure seems that the DIC function should be able to give fahrenheit readings also. The response time for the temp. readout would be faster and more sensitive in fahrenheit readings. This also goes for the coolant temp. readout also.

Well , I am not sure about how things are going at Intense , because you are making way more power than my G8 , but last time at the track , it would barely shift into 3rd gear , it would slip up the rpms for about a full second , and then shift when the TM came on and after the shift ocurred it was fine (didn't slip anymore) . So I called my friend at the chevy dealer (I don't trust the pontiac dealers around here) and asked him to look into this for me after explaining what is happening . He said there is a TSB for a hanging shift on the 2-3 , which is cause by a leaking seal in the transmission . Afriend of mine in NJ is also having some issues and he is also making way more power than mine , his will not even shift into 3rd at WOT anymore . I am hoping this seal is going to fix this , I will update this thread after I get this done . Hopefully it works because I was planning on racing the G8 in Memphis next week , which definitely changes that if it doesn't fix it .

So you're saying that there is a crappy seal in the transmission that is going out on us? This is something that we are going to have to replace

Technically I am stating that I have an idea of what is causing these issues that some guys making more power are having , but I don't know for sure yet , which is why I said I will update this thread after I have my seal replaced . Apparently this is an issue in C6's as well , I don't know if it is random or not .

The engineering mode does have a trans. sump temp readout. It is in centigrade so you'll hve to do the conversion. If you go to Google and enter centigrade to fahrenheit conversion you can print out a complete table of the conversion from 0 degrees to 100 degrees C.
You can monitor this temp on a DashHawk too.

No tranny issues yet, and we're closing in on 6,000 miles at ~ 640 horsepower. I'll keep my fingers crossed. :driving:

Good luck , I had 6500 miles on mine when I started having this issue . Let me know if you start having any issues . Did you test out that cam yet ?

The engineering mode does have a trans. sump temp readout. It is in centigrade so you'll hve to do the conversion. If you go to Google and enter centigrade to fahrenheit conversion you can print out a complete table of the conversion from 0 degrees to 100 degrees C.

Dana,

Here is the best converter I've found. Free software download and no spam ever.
http://joshmadison.com/article/convert-for-windows

Did you test out that cam yet ?
Re-engineering the fuel system (http://www.g8board.com/forums/showthread.php?t=5184) has proven to be quite the challange. We're ~ 90% done with that so if everything goes well we'll probably toss the cam in next week. :driving:

Dana,

Here is the best converter I've found. Free software download and no spam ever.
http://joshmadison.com/article/convert-for-windows
Thanks Ray.....just downloaded it.

Re-engineering the fuel system (http://www.g8board.com/forums/showthread.php?t=5184) has proven to be quite the challange. We're ~ 90% done with that so if everything goes well we'll probably toss the cam in next week. :driving:

Cool , I like the fuel system !

By the way , I ended up doing the TCM update at the dealer and retuning the transmission and all problems were solved for me !

Did you test out that cam yet ?
Yes, the cam has been tested. Results: 723 RWHP (http://www.g8board.com/forums/showthread.php?t=7185)! :driving:

With a Superchips tune at 50% TM and Superchips fan settings I won't hurt anything right?