MT and AT capabilities
 

Hey guys,

I wanted to know if anyone knows the threshold power wise of our transmission & what the names of them are exactly, can't find the exact info I'm looking for.

Thanks

There was a thread recently about this topic. The 6 speeds were borrowed from Lexus GS (IIRC). The general consensus was that the A/T should be good for double stock power (300-350 rwhp) and M/T should be slightly more than that (400 or so) with a proper clutch.

It's really comes down to the type of driving and frequency of abuse. If you are running high power steady-state with sufficient cooling... it should last fairly long. If you're tracking in the desert and letting the components see too much heat, they'll wear faster. Just keep an eye on temp, fluid color, and (if there's a magnet in the pan) wear rate.

Aren't AT trannies above 300-350 already?

Aren't drivetrain parts typically rated by torque?

On this car... 215 rwhp has been done with the AVO turbo kit. LINK

We didn't buy ISF's, and we shouldn't set unreal expectations. They will wear prematurely with added stress and temperature.

How high that is... we can't tell until people start breaking them. Judging by the the valvetrain (which can rev significantly higher than factory redline) and the fueling system (port and DI injector duty cycles are still OK on most turbo systems), it's safe to say that the transmissions were probably overbuilt too.

http://www.ft86club.com/forums/showthread.php?t=15483

they did 400 whp on the auto no problem... lol DIG DEEPER YOU WILL FIND ANSWERS

yes mechanical parts are tq lmited not hp limited, inherently hp is a function of tq and its easier to have a conversation talking about the limitations of parts with hp

Thanks for the link! SAE corrected, we're talking 410 rwhp on E85 at 17 psi and 280 on 93 RON at 8 psi. Not bad at all.

I'd consider that verification enough that the A/T will hold up to 410 hp for atleast a few dyno runs. Long-term life is unknown... but that's still great to hear!

yeah the only thing unanswered for me is that, how much heat was generated in the transmission that run? how many real life pulls can you do at that power without overheating the transmission?

theres actually a light that comes on when transmission temps get too hot :D but ive yet to see in any video or hearing anyone overheating their tranny yet

Has anyone actually broken the MT yet? I haven't been following the power threads much, but I also haven't seen any threads discussing broken trannies, sheared teeth, or aftermarket gear sets...

someone was pushing 461 whp and broke a shift fork when they went airborne and came back to earth...

really not shitting you...

just before that though he did bring the car to the top of 5th at 9k rpms

lol WOW

yes sir, that was Don@AcceleratedPerformance

If you do exceed the power limitations of the stock transmissions in either trim, what are some ways to allow them to handle more power?

so the tranny broke under "conditions" of a short lived, vehicular flight...

cars aren't supposed to fly, i would consider this an extreme condition... lol

i think full blown was pushing the 520-540 whp range and nothing broke

i think instead of pushing further on the stock motor, they decided to build the engine while it was still intact, i expect a good 700 whp from them when they get back, then we will see how the transmission takes it then

MT - Straight cut gears, better clutch, correct fluid, transmission oil cooler
AT - stronger clutch packs, upgraded solenoids, transmission oil cooler (i would get one larger than one you would use on the manual), lowest stalling torque converter you can get, better transmission fluid

low stall tq converter vs high stall tq converter

dd and track use(running many laps) - high stall tq converters allow more slipping (which causes heat) that is why you would want to use the lowest stall converter you can find on the aftermarket

drag - high stall converter for launching (more tq multiplication), when you put the power down it will be for only a short time period, the amount of heat created will greater with a high stall converter but your run is only going to be for 10-15 seconds
the amount of heat you create will be determined by how much tq/hp your car has and how high your converter stall's at if you're pushing.
lets say 600 whp, you are going to generate ALOT of heat but you will put down some good times. since the run is only so long i would invest in a cooler that also has a fan for cooling back in the pits so you can get set up for the next run