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Old 10-18-2011, 04:24 PM   #1
Synergy SATX
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Concerned about tire rub during autocross UPDATED

Take a look at his pic of my wife (and son pondering his date for his full driver's license) as they are pushing our new Pedders suspension. I am concerned about tire rub on the hard corners. Think this is too low of stance for autocross? First pic is hard turn and second is hard slow leading into a turn.
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Old 10-18-2011, 10:21 PM   #2
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Depends on how much drop you're interested in. I have lowered mine one inch with Eibach springs, and have done quite a few AutoX runs with no issues. If you run sway bars too, it helps level off some of the lean.
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Old 10-19-2011, 12:10 AM   #3
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Well, looks like you've already put it through its paces on the course. If you don't see any rub marks on the tires, then you should be OK in the future.

But like So Cal says, the stiffer your suspension, the more drop your Camaro can handle.
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Old 10-19-2011, 01:26 PM   #4
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If you haven't alraedy I would put a set of sway bars on the car from the look of the pics.If you have Adjustable bars on it I would set them stiffer.
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Old 10-19-2011, 02:37 PM   #5
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Quote:
Originally Posted by Bruce@raymondsperformance View Post
If you haven't alraedy I would put a set of sway bars on the car from the look of the pics.If you have Adjustable bars on it I would set them stiffer.
Pedders solution B. Rear set hard, front normal (older sway bar with only three options). I was told better autocross setting is soft front hard in the back. So I have Xa coilovers and maybe just raise the stance some? Looks like I had some rub after the event.
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Old 10-19-2011, 06:20 PM   #6
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I have the same. SwaybarB, FR=Soft, RR stiff. XA set to 12/10. Running CCW 20x10,20x11.5 using Invo 275/40 & 315/35. Car dropped around 1". Still looks good while address most driveway/curbs. Car has minimal body roll compared to stock.

Front
-1.0* camber (now -1.2*)
6.8* caster
.something toe(can't remember, but near stock)

Rear
0* camber
0* toe

No fender tire rub, but had to fill to 45 psi to address soft sidewalls. Car still understeers. Will be trying softer front and stiffer rear dampening to see if that helps understeer. Last solo course was slalom city.
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Old 10-19-2011, 08:18 PM   #7
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Quote:
Originally Posted by Synergy SATX View Post
Pedders solution B. Rear set hard, front normal (older sway bar with only three options). I was told better autocross setting is soft front hard in the back. So I have Xa coilovers and maybe just raise the stance some? Looks like I had some rub after the event.
What you have sounds good,I would raise the height up slightly to help with the rub then use the shock adjustments to fine tune it.The bar settings sound good for auto crossing.
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Old 10-19-2011, 09:41 PM   #8
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Quote:
Originally Posted by Synergy SATX View Post
Pedders solution B. Rear set hard, front normal (older sway bar with only three options). I was told better autocross setting is soft front hard in the back. So I have Xa coilovers and maybe just raise the stance some? Looks like I had some rub after the event.
With the OEM tires I don't think you'll have any rubbing issues. When you look in the inner wheel well do you have rubber marks? In terms of your settings that is 100% correct. You want to run it soft in the front and stiffer in the rear. The settings will be dependent on the surface as well as the course but that is the beauty of having a fully adjustable suspension. The picture below is my car loaded on the track and even with the OEM tires tucked I'm not rubbing. If the tire is rolling over it might appear like you have a rub.



Quote:
Originally Posted by sting808 View Post
I have the same. SwaybarB, FR=Soft, RR stiff. XA set to 12/10. Running CCW 20x10,20x11.5 using Invo 275/40 & 315/35. Car dropped around 1". Still looks good while address most driveway/curbs. Car has minimal body roll compared to stock.

Front
-1.0* camber (now -1.2*)
6.8* caster
.something toe(can't remember, but near stock)

Rear
0* camber
0* toe

No fender tire rub, but had to fill to 45 psi to address soft sidewalls. Car still understeers. Will be trying softer front and stiffer rear dampening to see if that helps understeer. Last solo course was slalom city.
I would suggest 8-12 front and 15-20 rear on the damping settings depending on the course and surface; tire compound also plays into these settings as well. I generally run 28-34 PSI depending on the surface with the OEM tires. It looks like you have aftermarket wheels and tires, what are you running?

I would also run the following alignment settings:

Front
-1.2* to -1.5* camber
-1/16" - 1/8" toe-in
7.5* to 8.5* caster

Rear
-.8* to -1.0* camber
0 to -1/16" toe-in

These setting will help your tire roll over issue and you'll have better overall corner grip. You have to be careful with rear camber as too much will affect the ability to put power down. Please feel free to call, email or PM me anytime with questions.

Kind regards,

Jordan Priestley
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Old 10-20-2011, 12:03 PM   #9
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I am a novice at the suspension AND autocross thing so I appreciate all the feedback and patience. I was set 20/24 for the autocross. Stock tires/wheels (wheels are black chromed so they look a little different). I use the car as a daily driver as well so will any of these camber/ caster/ toe adjustments affect the daily driver driving?
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Old 11-13-2011, 09:34 PM   #10
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Update. All is well. Very very well. Proof here. Thank you all for the help and advice.
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Old 11-13-2011, 10:11 PM   #11
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Awesome vids... I just found out Youtube has an IN BROWSER video editor... I edited my vid here...

I'm going to have to do a shot from behind the wheel... after I get a few runs in... haha my first run was terrible.

Anyways, it was fun to see you all out there. See you sunday at HH.
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Old 11-13-2011, 10:41 PM   #12
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Is it actually Rubbing? Or are you just worried that it might?
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Old 11-13-2011, 10:57 PM   #13
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I have Hotchkis stuff and running 275 tire up front and have no rubbing ..as well as the 315 in the back nothing rubs..
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Old 11-14-2011, 09:50 AM   #14
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Quote:
Originally Posted by Synergy SATX View Post
Update. All is well. Very very well. Proof here. Thank you all for the help and advice.
Sweet!!!

Kind regards,

Jordan Priestley
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