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Tracking / Autocross / HPDE / Drifting What these cars were built for!


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Old 09-01-2020, 12:36 PM   #29
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Tires. I don't have much life left in the Re71s. People say they go all the way down to the cords, but I've never really ran tires below the wear bars before. I need to research how much I really have left, but they only have 4 track days and 1 autocross.
If you replace RE71R when wear gets to the indicators, you're getting less than half the useful life out of them. I would also be at the indicators after 4 track days, but when I kept running them on the BRZ while Porsche was in the shop last year, I got 6 more track days out of them and didn't reach the cords or lose much if anything in terms of grip due to heat cycles.
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Old 09-01-2020, 12:42 PM   #30
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If you replace RE71R when wear gets to the indicators, you're getting less than half the useful life out of them. I would also be at the indicators after 4 track days, but when I kept running them on the BRZ while Porsche was in the shop last year, I got 6 more track days out of them and didn't reach the cords or lose much if anything in terms of grip due to heat cycles.

I'll snap some pics later, but my rear tread is almost gone. The fronts have a fraction more, so if I swapped to the rear I have maybe another half day on them. UNLESS you can run them with zero tread depth left.
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Old 09-01-2020, 12:51 PM   #31
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Via a friend hookup. Nice to get to know people

JB Racing Tires is a good spot to check out though.

My current set has 21 HCs on them. Just ran 6 sessions (20 minute stint hot laps) on them at NCM last event and they're starting to fall off now. Pace wise they're about a Yokohama Pace

I've had a couple friends order autocross compounds through JB and seemed to be pleased. I'll ask around to see if there's any that pop up. I know I can get some 255 40 17 Gforce 1s for cheap, but not sure those are worth snatching up over spending a little more for the r7s.
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Old 09-01-2020, 12:59 PM   #32
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I'll snap some pics later, but my rear tread is almost gone. The fronts have a fraction more, so if I swapped to the rear I have maybe another half day on them. UNLESS you can run them with zero tread depth left.
I'd say this is the replacement mark;


We've run them down to this;




They get edgier, much harder to get 10/10ths out of them, but they still feel like they have grip to my butt dyno.
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Old 09-01-2020, 01:02 PM   #33
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I'd say this is the replacement mark;



My rears are right about the same as yours above except my shoulders are even. Fronts have a smidge more depth, but I'll double check this evening.
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Old 09-01-2020, 01:09 PM   #34
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I'll snap some pics later, but my rear tread is almost gone. The fronts have a fraction more, so if I swapped to the rear I have maybe another half day on them. UNLESS you can run them with zero tread depth left.
You can run them with zero tread depth left...
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Old 09-01-2020, 01:09 PM   #35
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If you were autoxing I'd say another event day or two depending on conditions via swapping, but assuming your TT offers HPDE levels of seat time (1-2 hours per day) fresh tires are relatively cheap.
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Old 09-01-2020, 01:11 PM   #36
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I'd say this is the replacement mark;
You need more camber!
You probably should have flipped them before it came to this...

On my BRZ with -3.3 front -2.6 rear camber I never flipped them, just rotated every event. I ran them as "slicks" for at least 3 track days. Never showed cord.
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Old 09-01-2020, 01:40 PM   #37
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Has anyone run the Falken rt660 yet?
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Old 09-01-2020, 03:02 PM   #38
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You need more camber!
You probably should have flipped them before it came to this...

On my BRZ with -3.3 front -2.6 rear camber I never flipped them, just rotated every event. I ran them as "slicks" for at least 3 track days. Never showed cord.
I'm not honestly sure where I was at for that set of tires, I'm on -4.3°F and -2.3°R right now, will probably bump the rear up a bit and reduce the front a touch since I'm getting some inner camber wear along and I'll try a bit of toe out.

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Old 09-01-2020, 03:45 PM   #39
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They get edgier, much harder to get 10/10ths out of them, but they still feel like they have grip to my butt dyno.
Interestingly I ran my rear tires like that at my last track day but with inner camber wear instead of outer. The tires (RS3's) felt the exact opposite. Loose but easy to catch in corners. Never felt like they had any real grip especially on throttle.
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Old 09-01-2020, 04:12 PM   #40
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Interestingly I ran my rear tires like that at my last track day but with inner camber wear instead of outer. The tires (RS3's) felt the exact opposite. Loose but easy to catch in corners. Never felt like they had any real grip especially on throttle.
Different rubbers and construction, not surprising they act different as they age.

I hear BFG's for example feel exactly the same, they just have less grip.
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Old 09-01-2020, 04:21 PM   #41
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Different rubbers and construction, not surprising they act different as they age.

I hear BFG's for example feel exactly the same, they just have less grip.
Yeah good point. I wouldn't be surprised if it had more to do with construction/compound vs. wear pattern.

Is the consensus basically that tread depth has zero correlation to dry grip?
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Old 09-01-2020, 04:34 PM   #42
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Yeah good point. I wouldn't be surprised if it had more to do with construction/compound vs. wear pattern.

Is the consensus basically that tread depth has zero correlation to dry grip?
Depends on the tire, some have layered compounds and along with the age/heat cycle changes of the compound you may hit a point where you've used up all the sticky stuff before the grooves are gone.
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