What are you running for pressures and alignment specs and what are you getting for tire temps?
At Southwest Motorsport here in Albuquerque we run the 660s as our spec tire for Spec Miata. We've found that on the abrasive surface of Sandia speedway optimizing alignment and running much lower than expected pressures are the keys to getting the 660s to survive.
The exact numbers vary with the teams but We're running around 20psi hot and at least 3.5 degrees of camber in the front. In the rear we teams typically run as much camber as they can and still hit the toe number that they like. I think I'm at 3 degrees of camber and zero toe right now but I'd have to look at my notes to confirm.
Some alignment settings:
Front:
1-5/8 degrees negative camber
1/16 inch toe-out
Rear:
2-1/4 degrees negative camber
1/16 inch toe-in
Cold pressures are usually set at about 28 psi.
I bought a used set of RT660's for my 2013 boss. The prior owner used them in atlanta for a full season of Cam-C and 40 miles each way for each event. (he delievered them to me in charlotte in his new tesla wearing it's new set of RT660's for the event). I've done a full season on them minus two events and though they look like they've melted. I feel like I have got another season out of them.
The one great thing about high horsepower 4500 lb boats of performance cars existing, is that tire compounds have to be designed to survive the wear and tear that they put upon them. This results in sub 2500 lb vehicles simply not wearing out compounds that have remarkable amounts of grip, though if you check the pyrometer, you may find that running lower than expected tire pressure is needed in order to get the tires to warm up under use.
We heat cycled out two sets of falkens this year, both sets barely touched the wear bars and still have some amount of rubber left on the outer shoulders. The second set was more heavily loaded and wore worse, but still cycled out before they wore out. We only had them on the car for like two months so it felt like we killed them immediately. Until I went back and did the math and they had over 200 autocross runs on them, plus quite a bit of aggressive street driving as we were trying to dial in damper and sway bar settings on the street.
te72
HalfDork
11/2/22 10:33 a.m.
"My tires last too long" is about the weirdest thing I've ever read on GRM. =P
te72 said:
"My tires last too long" is about the weirdest thing I've ever read on GRM. =P
Figured someone would appreciate it. :)
84FSP
UberDork
11/2/22 11:05 a.m.
Are the delamination issues I hear about outliers? Wondering if folks getting this great wear heat cycled or not.
