STI Tranny not up to extra HP ??
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From: Evergreen state
STI Tranny not up to extra HP ??
I read this on the EVO site. Guess all the talk about their tranny's many BE true.
[QUOTE]
We're now working on a 3.0-litre turbo Impreza for Japan and Europe that will generate in excess of 350bhp.
"Unfortunately, we're having teething problems with the transmission as the current WRX STi six-speed box isn't capable of handling the torque the engine produces." Several solutions are being investigated, with the most popular being to ask a company such as Getrag, which has much experience in building heavy-duty gearboxes, to work on the transmission.
[QUOTE]
[QUOTE]
We're now working on a 3.0-litre turbo Impreza for Japan and Europe that will generate in excess of 350bhp.
"Unfortunately, we're having teething problems with the transmission as the current WRX STi six-speed box isn't capable of handling the torque the engine produces." Several solutions are being investigated, with the most popular being to ask a company such as Getrag, which has much experience in building heavy-duty gearboxes, to work on the transmission.
[QUOTE]
If you reread it, you'll note that they say it's not able to handle the type of torque that the motor produces, not hp.
Low-end monster torque is much harder on transmissions than high-end monster hp. All those 400+ hp Evo's are not making mountains of 2000rpm torque, they have a very nice peak a lot higher in the rpm band. Same for Subaru's that have been built up. The 6-speed in the Subaru has taken quite a bit of hp already, in excess of 500, but that's a very different type of hp from 350 developed by a 3.0-litre flat six turbo.
Cheers,
Paul Hansen
Low-end monster torque is much harder on transmissions than high-end monster hp. All those 400+ hp Evo's are not making mountains of 2000rpm torque, they have a very nice peak a lot higher in the rpm band. Same for Subaru's that have been built up. The 6-speed in the Subaru has taken quite a bit of hp already, in excess of 500, but that's a very different type of hp from 350 developed by a 3.0-litre flat six turbo.
Cheers,
Paul Hansen
Paul,
Thanks for the clarification. I know that was an older post referring to a different motor setup. I have not heard of any early concerns pertaining to the 6-speed in the STi. Time will tell as it will with the 6-speed EVO VIII.
regards,
Thanks for the clarification. I know that was an older post referring to a different motor setup. I have not heard of any early concerns pertaining to the 6-speed in the STi. Time will tell as it will with the 6-speed EVO VIII.
regards,


