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Old 10-08-2013, 03:17 PM   #1
Scooby Newbie
Member#: 356509
Join Date: May 2013
Location: st louis
2007 WRX STi

Default Flywheel torque question

I have a 2007 STi running stage 2 cobb map with full cobb turboback exhaust. Any estimation of of torque at the flywheel? I ask because I am about to get a new clutch and can't deciding between Exedy 15803 or Exedy 15803(HD). Google didn't really help me that much. Any help would be appreciated. Thanks.
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Old 10-08-2013, 04:43 PM   #2
Scooby Specialist
Member#: 197384
Join Date: Dec 2008
Chapter/Region: NESIC
Location: MWV NH
2006 WRX Ltd


Why do you need flywheel torque? Exedys appear to be rated at brake torque, which you're probably in the 300-340 range.
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Old 10-11-2013, 12:53 PM   #3
Scooby Guru
Member#: 46135
Join Date: Oct 2003
Chapter/Region: Tri-State
Location: NY
02 WRX
Sti V9 Spec C


The gearbox is a torque multiplication device.
The losses are in the form of lost power/heat, the output torque can be higher than the input torque, depending on the gear you're in. In 4th of the 6 speed, you're not at 1:1.
There is no 1:1 ratio in any of the gears, once you factor in the final drive ratio.
At the wheel contact patch you have a propelling force, not a torque.

So, when a figure comes out regarding torque from a dyno, I think there is a compensation factor involved.
It can measure no further than the torque at the axle, not "at the wheels".

But when you try to figure out what it compensates to torque-wise, things become unclear.

The torque at the axle will be different than the torque at the transmission output and the torque at the flywheel.
Vlad is offline   Reply With Quote

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