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08-19-2015, 09:23 AM | #1 |
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Tire Center Bar Wear Question
I was at Thunderhill last weekend, running the dunlop starpec 2s. I've been experimenting with tire pressures, starting at 35lbs and letting a little air out at a time. At 32lbs the tires feel most consistent to me. However, when I looked at the tires at the end of the day the center bar was worn in a slope towards the right side of the car. I suspect that this is normal, because the track is mostly left-hand corners, but I wanted to verify that this is normal, and not under-inflation.
If you've got some experience with tire wear at the track can you chime in? Front Passenger Rear Passenger |
08-19-2015, 09:25 AM | #2 |
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If you start to see wear like that you can have the tires flipped. These tires are directional so you don't have too many options with rotating. I also use around the same PSI for mine and they tend to wear a bit more on the outside edges.
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08-19-2015, 12:36 PM | #3 |
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More camber
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08-19-2015, 12:37 PM | #4 |
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How much camber are you running? Mine did the exact same as you describe when I went to laguna last winter, I was on -0.3 (I can't see your pics for whatever reason).
Even after 10k street miles, 7x AutoX's (~50 runs) and 2x track days (both Laguna 100 mins each) my ZII SS can still lay down a quick lap in the hands of a good driver. |
08-19-2015, 04:34 PM | #5 |
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My RE-71R looked similar, except one side of the center bar was almost down to nothing after two track days at Autobahn South. Stock suspension with -2.1* front camber, 0" toe, rear stock settings.
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08-19-2015, 05:17 PM | #6 |
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Same here with Nitto NT05. Stock suspension, -1.5 front camber, 0 toe.
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08-19-2015, 07:12 PM | #7 | |
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I'm also getting pretty close to the struts with 235/40/17 tires on +42 offset wheels, so that's a concern as well.
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08-19-2015, 09:51 PM | #8 |
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@CSG Mike - do you know anywhere that I can get a good suspension setup that would allow me to add more camber??
@strat61caster - I'm running 1.5 degrees of caster with the crash bolts and total toe is 0.7mm at the front. Rear camber is 1.8 degrees and total toe is 3.3mm. It seems this will be normal until I can add more camber. |
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08-20-2015, 12:05 AM | #9 | |
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08-20-2015, 06:22 PM | #10 |
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if it was worn out in the center I would suspect the tires were over inflated, when you say starting at 35 psi do you mean the target/hot pressures? otherwise it would be insane IMO , even for a lighter car like ours...
But in the picture where you're holding the level it looks like it wears from the outer/right side which may be normal with the lack of more negative camber (or vice versa if it's the inner side) + more left turns + over-inflated tires.. It may well be a combination of those factors but hard to say which contributes more
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08-20-2015, 06:56 PM | #11 |
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maybe @rice_classic can chime in and spot more lights on that since he changes his alignment between sessions during the race
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08-20-2015, 08:16 PM | #12 | ||||
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If, for some reason you're weird about tread direction, then you can rotate the tire on the wheel before rotating the wheels, but unless you own a tire machine, this gets pricey. Quote:
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However, I don't think that's what's happening here. It looks like you just have accentuated wear on one side which is to be expected and the "groove" is more of a factor of the tread squirm under cornering loads. 32 hot is probably on the low side while 35 cold would put on the high side. Aim for 35-40 hot. Another option: have a friend ready with one of these right as you come off track and check inside/middle/outside temps.
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08-20-2015, 09:58 PM | #13 | ||||||
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08-21-2015, 12:52 AM | #14 |
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That fancy adapter for the iphone isn't the droid you're looking for (no phone pun intended). Just like an infrared gun, it's only going to show you surface temp but what you want is the temp about 1/8' or so inside to actually measure the temperature of the tread band. And worse, if you aren't getting a reading immediately coming off, you're not getting accurate data anyway.
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