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Old 04-30-2009, 01:13 PM   #1
operating engineer
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Default Rear tire wearing faster than front w/ R- Compound?

I'm running 245 40 18 hankook c70 ( A stock) at the moment and the rear tires seems to be wearing alot faster the the front. I do run 38-40 psi in the front and 32 in the rear, with 32mm anti roll bar. The wear mark is dead on where it suppose to be. I only have 1 degree camber in front and 1.5 in rear. I would think the STi being front heavy would shread the front tires. I came from a e46 m3 w/ 3 degrees camber up front and even with the 50 50 weight distribution the front was wearing alot faster than the rear. Just wondering is ths normal.
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Old 05-01-2009, 01:22 AM   #2
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Are you sliding the car alot? What's your rear toe settings? My guess is one or both of these two.
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Old 05-01-2009, 02:20 AM   #3
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Originally Posted by Ruff View Post
Are you sliding the car alot? What's your rear toe settings? My guess is one or both of these two.
rear toe is 1/16 in. Front is 0. Car is not sliding but have understeer at corner exit of a constant radius turn, but that might be the anti roll bar and me getting back on throttle too early. Just wondering is this normal on this car, just started autocrossing this car this season and it's been quite different from other car I drove in the past
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Old 05-01-2009, 06:08 AM   #4
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The rear toe could attribute to the quicker wearing tires. Is it wearing more on the side or center?
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Old 05-01-2009, 01:22 PM   #5
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The rear toe could attribute to the quicker wearing tires.
It could also contribute to the understeer, no?

-Mike
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Old 05-04-2009, 12:14 PM   #6
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I wore my rears more at both wendover and lincoln. But since I wanted the car to get looser, I never swapped them to the front. In hindsight, I probably should have don't Saturday afternoon runs with them swapped.

Rear is on the left. Note the chalk line showing how much of the tire I'm not even using.
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Old 05-04-2009, 11:23 PM   #7
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I sometimes get more wear in the rear of my car also. It seems to be course and lot dependent. I wouldn't worry about it much. I just constantly rotate the tires after each autox. Plus I end up flipping the tires after they have some good wear on them.

My set up is:
06 STi in AS
275/40/17 Hoosier A6s...sometimes Kumho V710's
Whiteline 27/29 bar set at stiffer setting
Ohlins fixed perch struts
About -1.4 degree camber in front
1/8 in. toe out in rear.
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Old 05-05-2009, 01:34 AM   #8
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It could also contribute to the understeer, no?

-Mike
you are probably right. Since I put less than 5000 miles a year, I plan on getting more aggressive alignment . 1/8" toe out on front and rear , you guys think is enough?
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Old 05-05-2009, 09:26 PM   #9
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Do you know if your getting rear wheel inner wheel spin on corner exit? My car would do that some times coming down from tripoding.
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Old 05-05-2009, 09:46 PM   #10
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none that I feel, But i might not be going fast enough
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Old 05-05-2009, 10:29 PM   #11
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Quote:
Originally Posted by operating engineer View Post
none that I feel, But i might not be going fast enough
I thought that my clutch was slipping at first. But a friend told me that i was smoking the inner rear wheel on corner exit. But again i was on street tires.
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Old 05-06-2009, 04:34 PM   #12
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That's weird. On my 08 we killed a set of front Hoosiers before the rears even looked used at all.


What does Hankook recommend for pressure?
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Old 05-06-2009, 04:47 PM   #13
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Quote:
Originally Posted by operating engineer View Post
rear toe is 1/16 in. Front is 0. Car is not sliding but have understeer at corner exit of a constant radius turn, but that might be the anti roll bar and me getting back on throttle too early. Just wondering is this normal on this car, just started autocrossing this car this season and it's been quite different from other car I drove in the past
Kinda OT, but if you're understeering you're driving it wrong ^^. I own an e36 and cross that but when i have ththe chance I cross with my friends Audi A4 quattro. Instead of waiting to punch the accelerator after breaking and going into the turn like on a normal car, try breaking hard and punkingthe throttle immediately, otherwise understeer will drive you insane.

Back ON topic. Sounds like you could have a suspention issue or your tack setups have alot more turns one way than the other. Because you're right, as it stands with your understeer you should be chewing through your fronts .
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Old 05-06-2009, 04:48 PM   #14
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Quote:
Originally Posted by subie06 View Post
Do you know if your getting rear wheel inner wheel spin on corner exit? My car would do that some times coming down from tripoding.
Get a LSD ftw
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Old 05-06-2009, 04:50 PM   #15
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Quote:
Originally Posted by xcdhridr View Post
I wore my rears more at both wendover and lincoln. But since I wanted the car to get looser, I never swapped them to the front. In hindsight, I probably should have don't Saturday afternoon runs with them swapped.

Rear is on the left. Note the chalk line showing how much of the tire I'm not even using.

Notice all the extra bedded gravel in your left; I would defiantly say this is indicative of the inner-tire spin.

Also, lower your tire pressure a lot if thats how much chalk you still show after a couple runs.. that is ridiculous if you're not on your sidewalls at all. Forget recommended settings, do what every psi it takes to stop that problem now!

Last edited by WRXHillClimb; 05-06-2009 at 04:52 PM. Reason: Had a second thought too
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Old 05-06-2009, 04:50 PM   #16
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Get a LSD ftw
They have one
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Old 05-07-2009, 05:43 PM   #17
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Quote:
Originally Posted by WRXHillClimb View Post
Notice all the extra bedded gravel in your left; I would defiantly say this is indicative of the inner-tire spin.

Also, lower your tire pressure a lot if thats how much chalk you still show after a couple runs.. that is ridiculous if you're not on your sidewalls at all. Forget recommended settings, do what every psi it takes to stop that problem now!

I was actually trying to REDUCE grip in the rear to help the car rotate. And I knew the pickup/wear was likely from inner wheel spin. The chalk line was on the inside edge of the tire. My tire pressures were 28 front, 42 rear

I'm going to mess with toe out (rear) at this next event and running lower pressure.
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