For autocrossing my Elise in Minnesota, the Yoko 052 was the only possible answer. I couldn't get anything else to heat and stick.

Now I'm moving to a Cayman, It looks like it's between Yoko 052 and the new Bridgestones. Car had RE11 tires from 2014 on it when I bought it. Got plenty of heat, not a lot of stick. This makes me think the Cayman will heat the the new RE-71 tires just fine. I'm here for fun, I'm not talented enough to win anything.

 

2014? Yikes. They'll be hard as rocks LOL. A set of M/S tires probably have more grip.

 

This. I drove both cars on the same course last Saturday. First the Elise, then the Cayman. Elise was 5 seconds faster, even though I knew the course better when I drove the Cayman.

Looks like the new trick 'Stones don't come in the stock sizes for the 18" Cayman S wheels (8" front, 9" rear) on my car. What sizes would you suggest?

 

Wait. The rears on my Cayman are 265mm. I thought that was the stock size from Porsche on an 18" Cayman S II wheel, which I thought was 9 inches wide. What am I misunderstanding here? Is it just due to the lower aspect ratio?

 

In my experience, you can't really go wrong with the Falken RT660 too - so if you can't find the size in the new RS, try the RT.

 

Finally got a set of RE-71RS tires on my 2014 Cayman S and autocrossed on Sunday, going with 19” 255s up front and 285s rear. I wanted to go a bit larger all around but those were the sizes available. Running them on 8.5/10” FF10 wheels.

The tires are amazing! I’ve been running the older RE-71Rs on a 996 for a few years, but because I’ve switched cars, it’s a bit hard to compare them. Overall, the new tires offered an enormous amount of grip, with great turn in. No trouble placing the vehicle exactly where I wanted it on the course, and no wheelspin during full throttle launch. I started at 30 PSI all the way around, and did not adjust them during the 6 runs. The course was short, about 30 seconds per run, with 8-10 minutes between runs. Temperatures here in the Orlando area were in the mid-80s.

I’m very much looking forward to running more events in November!

 

Sounds great. How are they near breakaway? I like a telegraph message instead of a sudden loss of grip. Do they allow a bit of unplanned slip angle drifting?

 

Do to the nature of the tighter, slower course it's a bit hard to judge, but when the rear end did lose traction a couple of times, it was not a surprise. These were times when I was full throttle, turning a bit to the left. The rear slide out a bit to the right, which I was ready for in case it happened. Just a little countersteer and all was well, remaining on my intended line. But more to come as I learn more about the tires!

 

You were very very fast on Sunday! I wish they had larger fitments available cause they would be on my list!

 

I just got a set of RE-71RS's for my 987.2. What hot pressures seem to work the best for autocross? I've been searching and haven't been able to find much information.

The last two years I've been running RT660's, and they take a bit to warm up. I'm in the PNW so springtime temps are pretty low and it takes half of the run for the RT660 to come up to temp. One of the reasons I went with the new Bridgestone's is that they are supposed to be quick immediately.

 

Less than the 660's.

 

I had 275/30-18 RE71RS tires mounted on 8.5" rims for the front of my BS C6 Corvette. When I went to pick them up my tire guy said, "The first one wasn't too bad, but this one's fighting me. It'll be a few more minutes."

But, he got them both on.

Today I autocrossed them for the first time. (I had Yoks on the rear.) I had given them a heat cycle about 1.5 weeks prior.

I declined to run in the morning... I left the car in my garage where the coldest it gets is about 52F. It was 32F when the first run group started. (I live only 2 miles from the site.) It was 38F-40F, sunny and breezy when I did 3 runs in the afternoon. I was able to keep some heat in them with blankets and kept the engine running, though there was a long gap between runs. They felt fine, but obviously I can't say much about ultimate grip in more normal circumstances. I ran at 31psi, set just before each run. This is the same pressure I use for 660's of the same size on the same wheel, determined by testing, and seemed to work ok.

 

Uh, thanks for the info?

Anyone have some information a bit more specific?

 

You didn't give much info either. What tire sizes, what wheel widths, what camber, and what color is the car? I would still say without any of this info, whatever you ran your 660's at, probably a good 3-4psi less, maybe more.

 

I apologize for not being more specific. 2010 Cayman S, 245/40-18 front and 275/35-18 rear, stock suspension (front camber maxed out at - .6) and wheels. Artic silver with black interior.

I often inflate the tires with a bright green Ryobi cordless inflater if that matters.