Welcome to the North American Subaru Impreza Owners Club Wednesday August 23, 2017
Home Forums WikiNASIOC Products Store Modifications Upgrade Garage
Go Back   NASIOC > NASIOC Technical > Transmission (AT/MT) & Driveline

Welcome to NASIOC - The world's largest online community for Subaru enthusiasts!
Welcome to the NASIOC.com Subaru forum.

You are currently viewing our forum as a guest, which gives you limited access to view most discussions and access our other features. By joining our community, free of charge, you will have access to post topics, communicate privately with other members (PM), respond to polls, upload content and access many other special features. Registration is free, fast and simple, so please join our community today!

If you have any problems with the registration process or your account login, please contact us.
* Registered users of the site do not see these ads. 
Thread Tools Display Modes
Old 10-08-2013, 03:17 PM   #1
Scooby Newbie
Member#: 356509
Join Date: May 2013
Chapter/Region: SCIC
Location: San Diego
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.
* Registered users of the site do not see these ads.
weirdTurnedPro is offline   Reply With Quote
Sponsored Links
* Registered users of the site do not see these ads.
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.
JonnyV2889 is offline   Reply With Quote
Old 10-11-2013, 12:53 PM   #3
Scooby Guru
Member#: 46135
Join Date: Oct 2003
Chapter/Region: Tri-State
Location: NY
02 WRXstiV9 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

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Forum Jump

All times are GMT -4. The time now is 12:43 AM.

Powered by vBulletin® Version 3.7.0
Copyright ©2000 - 2017, Jelsoft Enterprises Ltd.
Powered by Searchlight © 2017 Axivo Inc.
Copyright ©1999 - 2017, North American Subaru Impreza Owners Club, Inc.