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Old 10-14-2009, 11:30 AM   #18 (permalink)
rednek01
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Join Date: Feb 2009
Location: Houston
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Drives: Mustang GT
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Quote:
Originally Posted by Lug View Post
The 350Z's AT was only good to about 400 to 420 RWH before mods were needed. I'd hope that the new 7AT handles more power. Another problem with the 350 AT was that when you went FI, the slower shift speed of the tranny would allow the RPMs to jump and hit the rev limiter when shifting under full acceleration. The fix was a throttle body upgrade on the tranny and/or a software change to the rev limiter level.
Quote:
Originally Posted by Lug View Post
Hopfully so. From what I've read, the full shift time has dropped about 500 milliseconds between the two trannys. That's an incredible improvement. I think the same 7AT is used in the FX45 (390 HP stock). If so, I'd imagine it's power handling has gone though the roof as well.
I am going to mostly agree with Lug I would bet that the trans can handle somewhere between 420-430 HP. Now the real question is how much torque can it handle. reason I say this is because most trans are rated by how much torque they can handle, the Z's don't put out an incredible amount of torque stock but adding F.I. will drastically increase the torque that the drive train has to handle therefore adding much more stress.

We can speculate all we want but until we start seeing high hp/tq or F.I. cars dropping trans and looking at what numbers they are killing them will we truly know the answer. Add to that driving style will have a lot to do with how well the drive train handles the power as well. if you are a street light racer every light and push your car regularly you may see a failure at a lower hp/tq level than someone who is a less aggressive driver.

So really who knows do some research as Lug has and we can add lets say 20-30% over engineering to what they are handling stock and that is probably a safe number to stay around for starters at least.
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