Originally Posted by GurgenPB

I don't know where you guys are comign from.... before my VB, I collected at least 12000 miles on near 400rwhp... And at least 2000 of those where on 420-440 rwhp on a STOCK tranny. We are about to do a build on that tranny, but i certainly do nOT feel the clutchpacks slipping.



Not true at all. The VB does NOT just make the tranny shift faster, it increases the clmaping force at WOP from 210psi of hydraulic pressure (approximately 3000lbs of clapming pressure) to 275psi (do the math on the clamping pressure) for a 31% increase in holding power. Remember that that tranny was designed with about 400crank hp (if oyu take into accoung that it's also found in the qx56). 30% on top of that should make it hold at east 533crank hp. Upgrading the TC and lowering it's stall should lower the fluid temps, which will probably increase it's holding a little bit (maybe negligible). Upgrading the cluth material and bands will get you only another 10% or so (from my research). Adding an additional clutch into each clutch pack, if that's possible here, will yield another 10-25%,a ssuming you go from 4 to 5 packs in that gear. By my calcs, you can then theoritically (and practically) get 630-720 crank HP, that's 510-583 whp reliably, assuming you have a fully and properly built tranny. If it's just the VB, then you are looking at 431whp minimum. All calcs assume 19% drivetrain loss. If you must push more power through the tranny relative to the amt of calculated horsepower that it can handle, then the quality of your ATF cooling IMO will play a major role in determining the ATs lifespan.

BTW, one can ask "why can't we crank the line pressure beyond the 275psi to get more clamping power?" The answer: you can, but that will overdrive the ATs hydraulic pump, and unduely affect its lifespan. With numbers beyond 275, it is estimated that the pump will last around 10-15K miles, and I belive this estimate assumes hard use. If that's what oyu are willing to do, that can sure be arranged.

Originally Posted by tinman

i had the built tranny on the car for about 5 months now.4 months on 402hp and 1 month on 452hp.it shifts hard and fast compare to stock.the reason i went with built tranny is to withstand the amount of HP i'm gonna push.straight from the guy who actually built it "this is good for 1000HP no problem" only time can tell.

Originally Posted by roncfpz

Gurgen.....thanks! That is excellent info. You seem to be at the forefront of this journey into high HP for the 5AT. We're all learning with some of us testing the limits and some being more cautious. So far my tranny has about 2k miles on 402whp and feels fine.

Thanks,
Ron

Originally Posted by KPierson

If anyone is interested I have a used 5at for sale. It has roughly 7500 miles on it. It has been sitting in my garage taking of space for over a year now, as I have a 6mt. I bought it and a longblock in a package, and the guy wouldn't separate them.

Originally Posted by tinman

no problem.yes it was raised to 7100.
WOT in 1st & 2nd? BAM,BAM

Originally Posted by tinman

there're few other mods,visit my webpage www.Tinmanpage.com or pick up a copy of www.Dragsport.com my car is in there.
www.Speedforceracing.comdid most of the works.

Originally Posted by MOTOP

Gurgen,

We fried first set of clutchpacks on mere 0.5 Bar from Greddy TT after only 700 miles on the car, mind you that is with huge tranny cooler. My point is when it comes to FI on our auto trannies, there's no set number past which clutchpacks will start failing. It all depends on how you drive it.

Good luck with your tranny build. Our path is 6MT swap, all parts are sourced except for ECU, waiting on Technosquare.


P.S. Level 10 - is a big NO NO !!!

Originally Posted by Fairlady_z33

Ive heard that the were bad at that one some guy a couple of months ago posted something about his tranny that he did with level 10 and that it sucked. One thing did you beat up on it after you got the 1k mile mark. I think the only way this is going to be resolved is when the clutch packs come out. Did they give you warranty on the tranny.

Originally Posted by MOTOP

It depends, labor being a huge factor.

Once we're done with the swap (~2 months) I'm going to post a big write-up which hopefully will become a sticky.