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Haven't heard of anyone doing a trans brake for the 6L80/90 trans. Seems that would almost be a waste of time, given the A6's super low first gear (4.02:1) and that current A6 converter technology has produced 1.2x 60' times from street driven setups already.
From my experience, I can only imagine that launching an A6 with, say, a 5500rpm stall converter, off a brake, would require you to shift almost immediately as the car launches. Another problem with it in auto shift mode would be that with higher stall speeds, you have to ensure that your shift time, shift pressures and shift speed is spot on in the TCM tune for the 1-2 shift, or you'll end up with it stuck on the limiter at the top of 1st and possibly in "reduced power mode". Ask me how I know. Now, if you're launching it in 2nd gear, like I've read some of the Aussie guys do, that might be a different thing. Not sure how long the trans would last though. My first experience with a transbrake turned my Coan built 1200+ rated TH400 into junk, so I wouldn't try it with an A6.
The Ford guys have this problem figured out. They have the trans brake apply in 2nd gear and leave in second. I have launched my 6l80e with a 6300 stall and it does shift quickly. I'm at the point I suppose a trans swap is the only option.
Last edited by whitelt3; Jan 10, 2017 at 09:17 AM.
I have been 1.30s but being a nitrous car I know its nothing like leaving on a brake at 4k or so. I have menscer shocks all the way around. Once I swapped to the coilovers all lifting of the tires stopped. Not sure if that is a good thing or not but it is clear the motion ratio these guys are using on the coilovers are far different then that of the stock leaf spring when it comes to stiffness.
Last edited by whitelt3; Jan 10, 2017 at 06:33 PM.
:Now, if you're launching it in 2nd gear, like I've read some of the Aussie guys do, that might be a different thing. Not sure how long the trans would last though.
Good ole Aussies.
Glad to see that someone is investing some time and effort in the 6L80/90 transmissions, but some actually test results on a track (which is the only place you would need or use a transbrake) that show actual 60’ gains would be what would sell these things. And some assurance that the necessary valve body mods wouldn’t screw up the transmission. The video with the white caddy shows a fairly impressive launch, but to my ear, it sounds like it’s shifting all funky? Those of us who’ve ever tuned a 6L80 know how finicky these transmissions can be when you’re trying to get them to shift right.
What kind of high HP builds has this been installed in and for how long? While it's one thing to see it work successfully a few times, it's totally different to see how it would hold up for an entire racing season (200-300 passes) in a car like mine.
I nominate you to be the test pilot on this project, Christopher!
If they give it to you, you will only make it work better anyhow, and then everyone would have credible independent results they can rely on.
You might need wheelie bars for the Vette then, though...
2020 Corvette of the Year Finalist (track prepared)
2019 C6 of Year Winner (track prepared)
Originally Posted by CI GS
Glad to see that someone is investing some time and effort in the 6L80/90 transmissions, but some actually test results on a track (which is the only place you would need or use a transbrake) that show actual 60’ gains would be what would sell these things. And some assurance that the necessary valve body mods wouldn’t screw up the transmission. The video with the white caddy shows a fairly impressive launch, but to my ear, it sounds like it’s shifting all funky? Those of us who’ve ever tuned a 6L80 know how finicky these transmissions can be when you’re trying to get them to shift right.
I thought the same thing too - that transmission definitely didn't sound right.
While I'm all for innovation and stuff, as I stated two years ago I'm not sure the benefits are gonna be worth it. This was from last Sunday morning and as you can see my car launches just fine off nothing more than a 2-step (set to 1800RPM this time) and foot brake:
I thought the same thing too - that transmission definitely didn't sound right.
While I'm all for innovation and stuff, as I stated two years ago I'm not sure the benefits are gonna be worth it. This was from last Sunday morning and as you can see my car launches just fine off nothing more than a 2-step (set to 1800RPM this time) and foot brake:
I hear you and would tend to agree that a transbrake will have limited utility on a 6L80, given the low first ratio.
Your car certainly looks and performs like it’s launching off a transbrake at much higher rpm. Wish I could get mine to leave half as good as that. I’m still trying to dial in the DA Viking coilovers on my car.
I’m very interested to know what gain you’ve seen with the 2 step, other than consistency?
2020 Corvette of the Year Finalist (track prepared)
2019 C6 of Year Winner (track prepared)
Originally Posted by CI GS
I hear you and would tend to agree that a transbrake will have limited utility on a 6L80, given the low first ratio.
Your car certainly looks and performs like it’s launching off a transbrake at much higher rpm. Wish I could get mine to leave half as good as that. I’m still trying to dial in the DA Viking coilovers on my car.
I’m very interested to know what gain you’ve seen with the 2 step, other than consistency?
Yeah, there were no gains to be had, it just helps me cut better lights.
I found that 100RPM up or down makes a difference of about .030 to my RT so if I'm redlighting or leaving late it's a simple adjustment to get back on track.
Yeah, there were no gains to be had, it just helps me cut better lights.
I found that 100RPM up or down makes a difference of about .030 to my RT so if I'm redlighting or leaving late it's a simple adjustment to get back on track.
Hey SubFloor@centurytrans, I have a quick question that may be stupid but are you a A6 vette or manual? I have heard a million times that installing a two-step on a a6 c6 would be a waste of money which is why I am curious and amazed you can pull that 60’. If you don’t mind when you get a free moment will you email me at lstwovetz12@yahoo.com.
2020 Corvette of the Year Finalist (track prepared)
2019 C6 of Year Winner (track prepared)
Originally Posted by Vetz2012
Hey SubFloor@centurytrans, I have a quick question that may be stupid but are you a A6 vette or manual? I have heard a million times that installing a two-step on a a6 c6 would be a waste of money which is why I am curious and amazed you can pull that 60’. If you don’t mind when you get a free moment will you email me at lstwovetz12@yahoo.com.
I also have a lot of questions for you because I'm curious about setting up the two step on my car and was wondering kind of how you did it on yours. Could you email me to at parkerbeem92@gmail.com
ok Subfloor got a few questions myself if you don't mind...……. first my 08 base which I just bought earlier this year is an A6 now my good friend over at AMP recommended the Yank PAS 3800 over the PAS 3400 and ive seen what Shane Fap did with his white vette with the PAS 3800 but seeing as mine is a true DD do you think it might cause too much heat in my stock A6 tranny? also which tranny cooler do you suggest? and lastly which or what size wheels are those Dark stars this car I bought has upgraded Z06 brakes with TSW Interlagos
side note... ive driven an 02 WS6 with a Yank 4k stall for years so running a bigger stall is not a concern for me obviously lol thank you for any and all info
