dgrobs

For sure the offline entries are the best, but again, he's talking about HPDE, so if I get a late pass and look offline to take the corner, and I see 100 lbs. of track marbles all over the place, I'm gonna wave that one off, especially if there's only a couple cycles on the tires.

I really hate when I pick up clag on the first or second cycle on the R-7's. I say to myself, "well, there goes another couple grand..."

Difool

Frank’s question is good. You haven’t mentioned rim or tire sizes or the car that they are on. Hoosiers run wide. In theory if you are getting buildup you aren’t getting much slip. Narrower tires will theoretically provide the same grip, until you get into more aggressive slip angles. A smaller tire has less tire to heat up, and should get into slip angles more easily, where they should generate a bit more heat.

When I ran R7s I was lucky if I could get to 10 HC . Also, while the buildup and vibrations are unnerving, you should be able to drive through them, assuming it isn’t getting too bad.

analogmike

I used to run 225 on 8" fronts, but the 911CUP guys are running 245 so I changed to those.
Pickup did not change, and it's mostly on the rears (275/45/15 on 9" rims)

Frank 993 C4S

I went from 225s to 205s in the front and my pickup problem disappeared. The narrower tire translates to a car length or more earlier braking into Big Bend. I don't have the power you guys have, but the car only weights 2150 lbs with me in it.

Difool

A Hoosier 275 (more like a 285 or 295 from another brand) will be quite stretched on a 9” rim. On spec caymans we run 245 on 9” and 275 on 10”, and even there we believe a 225 might be a better fit for the front 9” rims. It might be worth a try to use a narrower tire on both ends.

Ximian

Not much experience with F80s or Hoosier tires but on my heavyweight E92 with Pirelli DH slicks, I'm starting around 21 PSI cold and aiming for 30 PSI hot. They feel much better than when I was starting at 28 PSI cold and aiming for 34-36 hot.

For the first few laps of a session, I prioritize heating up my brakes so they warm up my tires through the wheels rather than just through the surface. If you start out with cold tires and get heat into them by just pushing, I'm assuming you're picking up strips of your own tires due to the rapid heating and cooling of the surface while the rest of the tire is cold.

winders

Start driving the right line and go fast enough......

gbuff

I'll remember that the next time I point you up the Esses

gbuff

OP, my (mostly rear) tires are covered with pickup at the end of a run from giving points everywhere on the track, usually later in the day when things heat up and the track gets dirty. As soon as I pit I get out of the car, go to the rear tires and rub the clag off the tread with my bare hand while it's still warm. Rub across the tread and it comes right off if you don't let it cool. Works for me, usually get a Titleist-sized ball of fine Yokohama rubber, and when you go out next time you'll have grip

dgrobs

Yeah, but I take the pass there because I know that you're car is too light to pick up marbles.

Always a pleasure in there with you my friend, and as always, thanks for putting that smile on my face, each time every time....

gbuff

Read post #24
Likewise, nothing like flying up there all the way track left with foot to floor, even in my car. Glad you enjoy, just doing my rock 'n roll duty, creating that buzz And super-glad you actually take the pass when many others won't

dgrobs

I do remember once in the garage at Watkins when you had a softball sized rubber ball in your hand. Maybe Niagara advanced or Trackmasters this season?

Your rock and roll duty, love it!!

gbuff

I think it was Chin Red, was going to have it bronzed but too expensive

Locker537

I'm confident you know this, but anytime I see someone rubbing their hands over tires I think about an errant piece of safety wire, screw, or any other metal object absolutely gashing your hand open.

So...be careful! If I remember correctly, Carroll Smith even mentions this in his books!

dgrobs

G has HUGE hands. He should be extra careful.....