Auto Tranny WHP, how much can the auto tranny sustain?

[Dawgz]

So, i had a question about the auto tranny

Whats the logical limit to the whp the auto tranny can hold?


This question is for the auto boosted guys.


My guess initially was like 240whp max? am i wrong?

[99V6solaraSE]

werent there a couple guys on here who pushed there auto trannies to the limit before actually upgrading the trannies.

[DatSRBoi]

I can not remember but Greg is the man you want to talk to.

Is this with a stock auto tranny or Built tranny? On built tranny the limit is the sky. Ive seen supra with 1700whp and muscle cars with 2000whp pulling hard on them auto trannys after they are built.

[CASTRO]

i say that it can handle A LOT. Why? Cause i killed an axel and spindle to the point where my wheel feell off before the auto tranny even complained. Right now, my tranny is still in perfect condition. Proper Maint is key

[Dawgz]

I can not remember but Greg is the man you want to talk to.

Is this with a stock auto tranny or Built tranny? On built tranny the limit is the sky. Ive seen supra with 1700whp and muscle cars with 2000whp pulling hard on them auto trannys after they are built.

Im talkn about the solara auto tranny here.

and im talkn about the stock tranny, i talked to Gabe and i was astonished when he told me his tranny was stock. He's doing around 300whp and i was very impressed that the tranny can hold that power.

[Dawgz]

i say that it can handle A LOT. Why? Cause i killed an axel and spindle to the point where my wheel feell off before the auto tranny even complained. Right now, my tranny is still in perfect condition. Proper Maint is key

and what do u mean by proper maintenance...regular, maybe yearly atf changes? i know u do urs every track session, but for us non-track guys...i think yearly should be good? what do u think? what else do u do?

[CamryOnBronze]

^ how much more power are you really planning to push i think is the question...

If you want to know, talk to tony the tiger on toyota nation... hes got a 1mz with an auto tranny and he ended up building his, so he is very knowledgeable about both built and stock auto trannies and boost

[Dawgz]

^ tony either hates me or never responds to pms, or the latter.


Ive tried to talk to him a few times, no go...so w/e.

[DatSRBoi]

Tony is on allot on the supra forums. You can find him there.

[CASTRO]

yearly proly isnt the key, i would suggest you change it depending on how you drive the car. Time length isnt nearly as important as conditions and how the car was driven. I personally do a drain/fill with every oil change I do. Then again, I also drain/fill before and after every event.

[CASTRO]

^ tony either hates me or never responds to pms, or the latter.


Ive tried to talk to him a few times, no go...so w/e.

haha, man, for tony's setup it is required. I would only worry about your tranny if you were pushing close to 280~300+ whp. But that'd mwan you allready had a built internal motor. Really, Im pushing 200k+ miles and never had any tranny problems. Our tranny is tough, I've tried to kill it as an excuse to do a manual swap, but never could.

[Eye8Pussies]

from tony's mouth- without an ebc....about 220whp for daily beating and hard driving for reliability same as stock

though, his experience is from using a turbo on his mostly stock engine and stock tranny....which has a less linear onset of power and more of a slamming between gears...

it comes down to that second gear sprag....if you drive pretty consistently outside of the first two gears and do single gear pulls, keeping the transmission fluid in good shape and having a good tranny cooler will keep your tranny going for a good long time...when you start doing things such as autocross or tracking which can slam you down to first and then back into second, or between second and third....then you're asking for trouble...


as for castro's experience.....the problem axle/spindle is more due to turning and corner than power...considering the size and build of our v6 axles, it'll be cold day in hell before an automatic supercharged camry/solara with bolt-ons can destroy our axles due to the power it puts down

[CASTRO]

^
true, it did happen on a banked high speed corner going ~ 90mph @ WOT while hard cornering and on a FWD staggard tire/wheel setup.

Yes, I beat on my car... but its fun! haha

still, just like Eye8 said, with the s/c setup and a linear power curve, you dont have to worry about busting the auto tranny. Its that huge surge or turbo power that kills it, or not maintaining clean/fresh oil. I've actually never heard of track driven autos fail if maintained, but instead of DD autos that have had their fluid changed every "factory interval" 60k+ miles. Now thats nasty dirty oil. I personally think those long interval ATF changes in DD it more of a threat than a modified car environment where its at least a cause of concern for maintenance.