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Old 03-30-2010, 09:17 AM   #1
jc8587
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Default Did my alignment eat my tires?

Hello NASIOC,

I just got back from a weekend at Putnam Park with 100-speed lapping days and looked at my tires (235-40-17 RA-1s) and noticed one of them is beginning to cord on the inside of the tire.

This leads me to beleive a few things:
1) As these were used tires when I bought them, they were already thin on that inside point.
2) Putnam is always harsh on the front left, but as I didnt mark these tires when I took them off, I have no clue what side the tires came from (STUPID STUPID STUPID)
3) My alignment is so far off it is eating tires? :

Front Camber: -4.2*
Front Caster: 3.8*
Front toe: 0.2* Out

Rear Camber: -3*
Rear Toe: 0*

4) I overheated the tires and the result is money down the drain?


Please only helpfull critisism, I have enough disgust at the myself at the moment. Tires are expensive!


Also, last couple years I have ran -3* on all four corners with no negative side effects... maybe -4* was just pushing it too far?
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Old 03-30-2010, 09:20 AM   #2
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Looks like too much front camber to me I personally wouldn't run that much camber in the front or rear.
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Old 03-30-2010, 09:29 AM   #3
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Has it been -3 degrees all 4 corners for street driving, or tracking as well? I think it's the excessive negative camber plus the harsh corners you're describing that wasted the tire. Not to mention the fact that the tire was worn on the inside edge to begin with. I feel you have pretty much answered your own question.
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Old 03-30-2010, 09:32 AM   #4
jc8587
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Quote:
Originally Posted by HybridBoxer View Post
Has it been -3 degrees all 4 corners for street driving, or tracking as well? I think it's the excessive negative camber plus the harsh corners you're describing that wasted the tire. Not to mention the fact that the tire was worn on the inside edge to begin with. I feel you have pretty much answered your own question.
Haha

Never hurts to have a few opinions.

I don't daily drive on the ra-1s if thats what you mean. I do drive on that alignment
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Old 03-30-2010, 09:36 AM   #5
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Id say 4+* of camber and toe out are likely culprits. How the hell did you get to 4+* anyway?
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Old 03-30-2010, 09:43 AM   #6
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Too much front camber. When I run at tracks like Summit Point and NJMP, which are predominantly right turns, I will see more inside wear on the right front. With as much camber as your running, I would bet it's even worse.
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Old 03-30-2010, 09:53 AM   #7
jc8587
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Quote:
Originally Posted by cucamelsmd15 View Post
Id say 4+* of camber and toe out are likely culprits. How the hell did you get to 4+* anyway?
RCE camber plates and aftermarket camber bolts... That coupled with the ALK and 3.8* of caster doesnt help the camber issue in turns..

I guess I found where "too much is too much".

Quote:
Originally Posted by mav1c View Post
Too much front camber. When I run at tracks like Summit Point and NJMP, which are predominantly right turns, I will see more inside wear on the right front. With as much camber as your running, I would bet it's even worse.
What sort of camber setting should I be looking for?

-3* ? -2*?
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Old 03-30-2010, 10:02 AM   #8
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I'd shoot for -3.0 -3.5. Take your hand or a pyrometer and see if all of the tire is getting hot. If not, then adjust your camber accordingly.
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Old 03-30-2010, 10:04 AM   #9
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Be careful using aftermarket camber bolts in the front, they are usually smaller diameter and the front loads on those bolts can be pretty great. The factory bolts and top camber plate should be more than sufficient to get the settings you need. I run -3.5, but that is with Yokohama racing slicks, they like that much.
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Old 03-30-2010, 10:09 AM   #10
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I run -3F, -1.8R. RCE T2's (600/500), 24mm Whiteline sways F&R both in stiffest setting. Nice even tire wear as long as I rotate regularly.
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Old 03-30-2010, 10:21 AM   #11
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We run -4.2* on the front of our race car with a slight bit of toe out and never have any problems. Running -3.4 in the rear with a bit of toe in.

Wouldn't surprise me if you were just running the most worn tire on the left front. Putnam will kill it quickly if you're not careful as you know.

Tony
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Old 03-30-2010, 11:02 AM   #12
jc8587
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Quote:
Originally Posted by Turn in Concepts View Post
We run -4.2* on the front of our race car with a slight bit of toe out and never have any problems. Running -3.4 in the rear with a bit of toe in.

Wouldn't surprise me if you were just running the most worn tire on the left front. Putnam will kill it quickly if you're not careful as you know.

Tony
Thanks guys,

I'll keep this is mind and remember bring a pyrometer, notebook, and a cautious outlook with me next time! lol.
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Old 03-30-2010, 05:36 PM   #13
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Quote:
Originally Posted by mav1c View Post
I run -3F, -1.8R. RCE T2's (600/500), 24mm Whiteline sways F&R both in stiffest setting. Nice even tire wear as long as I rotate regularly.
That seems, good. Add a little more caster to regain the front grip you'll lost with the less aggressive camber
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Old 03-31-2010, 08:51 AM   #14
jc8587
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UPDATE:

Judging by brake dust, it is actually a rear tire that has corded, not the front.

I am going to check the alignment tomorrow and see if the toe slipped.
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