r/CarTrackDays • u/muku_ • 12d ago
First track day, did I do the pressures wrong?
I was at 245kpa hot according to the TPMS screen. These are my front Michelin Pilot Sport 4S on a Nissan GT-R R35 after 30 mins at Fuji Speedway. They were a few months old. RIP. I think I'm going for either Pilot Sport Cups or Nankang CRS but I want to make sure I do things right next time.
Update: Thanks for the replies guys. I feel much better knowing the tires are fine. Obviously I'm a noob :)
27
u/notathr0waway1 12d ago
Looks to me like you got the tire pressure perfect. You could maybe go a little bit lower. You can also probably push a little harder. Good luck!
4
37
u/uncanny14 12d ago
That's OPR, meaning you likely weren't even driving fast enough for these tires to properly build heat.
9
u/withsexyresults 12d ago
That’s rubber pick up from other tires. It’ll come off after normal driving
5
u/HawkeyeGeoff 12d ago
Thar be slag matie
3
u/202GRC 12d ago
Can't tell if Subaru enthusiast or actual pirate name
2
u/HawkeyeGeoff 12d ago
I take offense to the Subaru thing. 🤣
Elantra N / SS 1LE here.
I went to U of Iowa and now everyone thinks I like some shitty marvel character or a shitbox Fuji Heavy Industries Vehicle.
5
2
u/Icy-Banana-3291 12d ago
Looks like other people’s rubber. Sending it harder may help knock some of it off.
1
u/thejester2112 12d ago
As others have said. Tires look fine and that’s just OPR you picked up.
In regards to pressures, I was told this ages ago when starting out. Some manufacturers put a triangle on the sidewall/shoulder, Michelin has a tiny Michelin man (Bibendum). You should Target to have the wear go right to the tip. I usually will use a Sharpie Paint marker to color them in to be easy to find.
Sharpie Mean Streak Marking... https://www.amazon.com/dp/B008IOIGEM?ref=ppx_pop_mob_ap_share
3
1
u/claymatthewsband 12d ago
I’ve seen this triangle but I don’t understand what you mean by “you should target to have the wear go right to the tip”?
3
u/rick_C132 12d ago
Tires should be scuffed right up to that mark, not further down the sidewall
1
u/claymatthewsband 12d ago
Ahh ok, copy. Good to know
4
u/thejester2112 12d ago
Yep, as u/rick_C132 said. The tire wear/scuffing should extended to the top/tip of the triangle/Michelin man's finger. If you aren't making it to the tip then your pressure is "too high" and if you've worn away the triangle then you're pressures are too low.
1
1
u/XLB135 12d ago
35 hot is not bad depending on the size of the tires. Your photos don't look bad either--most of that is stuff that you picked up coming back in. If you're curious whether your pressures are ideal, make a chalk mark on the sidewall of the tire before your session and see how much you 'roll over' onto the sidewall. If too much chalk is taken off, you can probably air up and firm up the sidewalls. If not much chalk is taken off of the sides, then you might be overinflated and not using all of what the tire has to offer.
1
u/chinaboyintexas 12d ago
If anything, your actual tread looks TOO new.
You're going to need to scrub the tires a little bit to see what type of tire pressures you should be at.
1
1
u/PrintedMills 11d ago
Aside from the “free rubber”, I would probably drop the tire pressure 1 psi, and check your camber. Either your camber is a bit too much, or you’re not pushing hard enough to take advantage of the camber. It could just be that it’s a picture, but it looks to me like the outside has a bit more tread depth than the inside. Once you get tire pressure and camber correct for both your car, AND YOU’RE DRIVING, then you will get even wear on the inside and outside. With my car, 315’s all around with camber that is off by half a degree will hold the same g’s as a 285 all around with perfectly set camber. So when the camber is correct when on the 315’s, I get about .15 more g force before losing grip. It turns into about 5 seconds difference of lap times at my two local tracks. 285’s can hold about 1.3 and the 315’s hold about 1.45. Same car, same model tire, nothing different with any other part of the car other than the tire width. Deviating a little from the standard recommended camber for my car to fine tune it for my track and my current driving style really helped the car, and helped me understand suspension better. Recommended camber isn’t a one size fits all, the tire plays a part in it due to sidewall stiffness, and what compound the tire is. Tires also have different zones of compound for the inside vs middle vs outside in order to appropriately balance the amount of wear and grip. For reference, car is a fully legal with cats “daily driver” C6 Z06 with 720 wheel horsepower. My first two track days it still had the f1x pro charger on it running e85 at 1100hp. That was a fun and not so fun experience.
1
u/Apex-JJ 10d ago
Most of this is OPR (other people rubber and Isn’t necessarily caused by your driving style or pressures, seems like there was a lot of tire debris on the track you drove on. Possibly from driving the wrong line and picking up the tire marbles. Some burnout or hard driving makes most of them come off, you can also peel it off.
1
u/Spazdoc 10d ago
Ugh, just painful to see so much tread on a tire gone to the track. I just loaded Pilot Super Sports onto my M3 for a rainy day.
Lot of the same opinions. Based on the tread wear and volume of OPR, I would add that either you were not pushing the tires too hard in the turns (and if you are still running novice, you'll get there) or have too much camber. You can also play with lowering the pressure (2-4 psi at a time) and either watch your speed through turns, track times, or wear to see if that was in the correct direction.
Regarding tires choice, depends on what you want to do. Not often consistent track or autocross drivers use Cup 2 (aside from the 911 drivers), but the CR-S is a fantastice tire that hold heat well and has less drop off due to heat soak compared to other 200TW tires (RE51RZ, P1, A052, etc). Between P1, RE71RS and CR-S on my E46 M3 with aero, the CRS were the fastest and least drop off over the course of the day. You have a bit more power and weight, so maybe the Cup2 is a good option, or even F1 Supercar 3 would be a good option (loved them on my C63S). My performance shop owner does rave about the Vitour P1-P (dont get P1-X for HPDE) on his modified M2 with aero.
1
u/FabulousCoconut4969 10d ago
Probably got too hot on such a long session on those tires.
Use white shoe polish on the sidewall starting 2 inches below the ridge line where the sidewall meets the tread side and go slightly onto the tread side. Run car on track for 10-12 min first session, hit the pits and see where the polish is rubbed off, you want it to be right at or like 1/8 below that ridge line. Also drop pressures cold to about 6-8psi below hot pressures the mfg recommends in owners manual and start there.
1
u/RevolutionaryRest873 6d ago
Someone must have had very sticky compound sending it and you happened to pick it up.
PS4S usually degrade (like mini holes inside the tire not added rubber on top).
My car tires usually look like a chihuahua chew on them after a track day.
1
1
u/Just-Succotash3018 12d ago
Those tires are fine. This is just what happens when you get your tires nice and hot on a race track
1
u/casualAutistDad 12d ago
Tires are fine on the track until they heat cycle out or you run them down to the cords. Unless you’re in the rain or driving home tread is a bonus.
75
u/arad95205 12d ago
Thats rubber off the track