Welcome to the North American Subaru Impreza Owners Club Tuesday December 18, 2018
Home Forums WikiNASIOC Products Store Modifications Upgrade Garage
Go Back   NASIOC > NASIOC General > Motorsports > Autocross

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
Prev Previous Post   Next Post Next
Old 01-30-2013, 08:32 PM   #1
Scooby Newbie
Member#: 280283
Join Date: Apr 2011
Default Attn: SCCA STU/X Cars! Rear Differential Mod Petition

hey all,

as you can see, i'm not a subie guy, though I've been a member on this forum for a couple of years. i run an evo 9 gsr in SM, which I'm selling to run an Evo 9 mr in STU or ASP.

the reason I'm posting here is because I'd like to start a petition to allow one of the differentials to be upgraded in STU and STX classes for AWD cars.
I'm not sure how into evos you guys are over here, but the rear diff mod has been revolutionary in terms of evo handling - it really lets you bring the car around on power.

more info about rear diff mods for evos here: http://forums.evolutionm.net/evo-eng...ound-here.html

I think it's a good chance for the SCCA to reconsider its position on aftermarket differentials for AWD cars in STU/X. As it stands right now, 2WD cars in ST are allowed to run any aftermarket differential, while AWD cars are not - this rule was originally created to handicap AWD cars, but I think that a handicap like that is unnecessary and much harder for the rules to justify. If any change is possible, now would be the best time, since our AWD cars have shown that they aren't undefeatable (see M3 for details).

This may not have as much impact on STIs, (which I believe have the R160/180 diff - which is already good), but has a definite impact on STX WRXes. There is real benefit to be had by doing this mod - one that was not commonly explored for evos until maybe 2008 or 2009.
Taking a quick glance at the Nationals results last year, WRXes seem to be more or less struggling to be competitive in this class. What the rear diff mod has allowed evos to do is optimize their setup rather than running some huge rear sway bar/other tricks to get the car to rotate, and let the rear differential take care of the corner exit. I think a WRX with this mod would be way more competitive in STU if it were able to do this mod. Drivetrain wise, the WRX doesn't really have a lot going for it - much like the 03 Evos (open front, viscous center, improperly stacked and weak to begin with rear diff) - how many 03-04 evos do you see doing well in a class that limits drivetrain modifications?

To be clear, this goes beyond restacking plates/refreshing the rear diff to factory spec. evo rear diffs were improperly stacked from the factory so that they'd be quieter, smoother, whatever. I believe mustangs with factory LSDs are set up the same way. This is more about mods that add plates and change lockup, like TRE's ($450), or beyond (Cusco, etc.)

Also to be clear, I mean open up the rules to allow one of the diffs of the car to be modified. the rest of the determination is up to individuals. i don't see this as all that outrageous of an idea

The thread I've just started on evom is here: http://forums.evolutionm.net/motor-s...-petition.html


Let's discuss and send in some letters! http://www.sebscca.com/

Last edited by kyoo; 01-31-2013 at 09:35 PM.
kyoo 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 08:57 PM.

Powered by vBulletin® Version 3.7.0
Copyright ©2000 - 2018, Jelsoft Enterprises Ltd.
Powered by Searchlight © 2018 Axivo Inc.
Copyright ©1999 - 2017, North American Subaru Impreza Owners Club, Inc.