Welcome to the North American Subaru Impreza Owners Club Saturday September 26, 2020
Home Forums Images WikiNASIOC Products Store Modifications Upgrade Garage
Click here to visit TireRack
Brakes & Suspension Forum sponsored by The Tire Rack

Losing traction? Need new tires?
Click here to visit the NASIOC Upgrade Garage...
Go Back   NASIOC > NASIOC Technical > Brakes, Steering & Suspension

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.







* As an Amazon Associate I earn from qualifying purchases. 
* Registered users of the site do not see these ads. 
Reply
 
Thread Tools Display Modes
Old 09-09-2020, 12:24 AM   #1
richaarizard
Scooby Newbie
 
Member#: 505370
Join Date: Aug 2019
Default How much camber would you run for this setup?

2006 sti
Coilovers: 14k Front 12K rear track rates 2 way adjustable
Sway bars: Whiteline 24mm front and rear
Whiteline Roll center Kit
Whiteline ALK
Tires: 295/35/18 R888R R-Compounds
Wheel: RPF1 18X10.5
Height: 13.75 front 13.30 Rear

So I've had a problem with understeer and the tires rolling onto sidewall. Even with -3.4 camber front -2.4 rear. Im thinking my coilovers are worn and compressing too much hence gaining too much positive camber in cornering at 10k 8k. So I got new coilovers with higher spring rates. Ive heard the r compounds promote more body roll so im not sure how much to use for track?

How much camber in a similar setup do you guys run to eliminate push?

And yes im taking the right lines and am good on throttle the car just seems to nose dive and push in corners.
* Registered users of the site do not see these ads.
richaarizard is offline   Reply With Quote
Sponsored Links
* Registered users of the site do not see these ads.
Old 09-09-2020, 02:21 PM   #2
gtsilver944
Scooby Newbie
 
Member#: 443043
Join Date: Mar 2016
Location: Maine
Default

Not sure I know the answer for you. But some thoughts -

295 is the max width you can run on a 10.5. Could try 285s next time. How is sidewall stiffness on the R888s? What tire pressure are you running? My car became too skittish under braking at autox with more than -3.5 F camber.

Roll stiffness on these cars is more defined by sway bars than springs.

Did you get the coilovers revalved for those spring rates? That's a 50% increase the rear, which is more than more coilovers can do without a revalve.

Also, try raising the rear a bit.
gtsilver944 is offline   Reply With Quote
Old 09-09-2020, 04:16 PM   #3
T-37
Scooby Specialist
 
Member#: 175624
Join Date: Mar 2008
Chapter/Region: MWSOC
Location: Wichita, KS
Vehicle:
0304 WRX WRX
SY WRB

Default

How fresh are your tires? Are they heat cycled out? Where are you experiencing the push? Entry or mid corner? The high camber tends to hurt turn in a bit, and I've noticed (at least in my autox car) as tires age turn in gets pretty lazy, but once the contact patch takes a set, they hold relatively well (I didn't want to buy a new set of tires for 2020 because covid shortened our local season).

Have you tried measuring temp across the tire to see if they're even?
T-37 is offline   Reply With Quote
Old 09-14-2020, 10:12 PM   #4
speedyHAM
Scooby Specialist
 
Member#: 48377
Join Date: Nov 2003
Chapter/Region: MWSOC
Location: "They eat fish soaked in lye"
Vehicle:
1996 Gutted, built
XP class Impreza L

Default

The previous two answers are right on the money. There are hundreds of factors that could affect handling at this level. If you are rolling onto the sidewalls, more tire pressure is needed in the fronts. What pressures are you running? On similar tires a few years back I ran 41 psi on the front and 35 psi on the rear.

First thing to do would be to adjust tire pressures, then sway bars, of course, this is assuming the shocks are valved correctly for the springs. All of that is dependent on your tires being not heat cycles out, as fresh tires make a huge difference when you are running R-comps.
speedyHAM is offline   Reply With Quote
Old 09-15-2020, 06:59 AM   #5
Norm Peterson
Scooby Specialist
 
Member#: 498642
Join Date: Mar 2019
Chapter/Region: Tri-State
Location: our wrx IS the family sedan
Vehicle:
'19 WRX Ltd 6M dgm
'08 Mustang GT (the toy)

Default

Why not try running a bit more rebound damping in the rear shocks?


Norm
Norm Peterson is offline   Reply With Quote
Old 09-15-2020, 07:02 AM   #6
Norm Peterson
Scooby Specialist
 
Member#: 498642
Join Date: Mar 2019
Chapter/Region: Tri-State
Location: our wrx IS the family sedan
Vehicle:
'19 WRX Ltd 6M dgm
'08 Mustang GT (the toy)

Default

Are your tires really 35 profile or are they 30's?


Norm
Norm Peterson is offline   Reply With Quote
Old 09-15-2020, 09:35 AM   #7
AndyRoo
Scooby Specialist
 
Member#: 20952
Join Date: Jul 2002
Chapter/Region: MAIC
Location: Baltimore, MD
Vehicle:
BRZ & Datsun
White & White

Default

I would use a pyrometer.

(not being snarky, but I would use that to start, and from there determine if other set up changes are needed if I couldn't tell from the driver's seat or other data).

- Andrew
AndyRoo is offline   Reply With Quote
Old 09-16-2020, 02:36 PM   #8
BlueSTI4Me
Scooby Specialist
 
Member#: 34361
Join Date: Mar 2003
Chapter/Region: MWSOC
Location: MI
Vehicle:
04.7 STI
WRB IG @got2boostit2

Default

What is the use? Road course or autocross?
BlueSTI4Me is offline   Reply With Quote
Old 09-16-2020, 09:48 PM   #9
subaru_gc8
Scooby Specialist
 
Member#: 29292
Join Date: Nov 2002
Chapter/Region: SCIC
Location: Orange County CA
Vehicle:
2004 WRX wagon
silver

Default

Quote:
Originally Posted by richaarizard View Post
2006 sti
Coilovers: 14k Front 12K rear track rates 2 way adjustable
Sway bars: Whiteline 24mm front and rear
Whiteline Roll center Kit
Whiteline ALK
Tires: 295/35/18 R888R R-Compounds
Wheel: RPF1 18X10.5
Height: 13.75 front 13.30 Rear

So I've had a problem with understeer and the tires rolling onto sidewall. Even with -3.4 camber front -2.4 rear. Im thinking my coilovers are worn and compressing too much hence gaining too much positive camber in cornering at 10k 8k. So I got new coilovers with higher spring rates. Ive heard the r compounds promote more body roll so im not sure how much to use for track?

How much camber in a similar setup do you guys run to eliminate push?

And yes im taking the right lines and am good on throttle the car just seems to nose dive and push in corners.
try easing up on the rear camber. its hard to figure out since we dont know how you drive, where you are driving, it is possible that you are being too agressive in the corners which is making your front push alot. but is hard to say there isnt much info to go on. or maybe you just ahve to learn how to drive a awd car on the track.. its very different from a mr or a rr car, but once again, theres not much info to go on. There are so many questions.so here is one for you. when are you pushing at the entrace or the exit of the corner?

Last edited by subaru_gc8; 09-17-2020 at 03:29 AM.
subaru_gc8 is offline   Reply With Quote
Reply

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 09:46 AM.


Powered by vBulletin® Version 3.7.0
Copyright ©2000 - 2020, Jelsoft Enterprises Ltd.
Powered by Searchlight © 2020 Axivo Inc.
Copyright ©1999 - 2019, North American Subaru Impreza Owners Club, Inc.

As an Amazon Associate I earn from qualifying purchases.