What are you guys setting your cold tire pressure for Sport Cup 2s at the track? I'm thinking 26 front and 30 rear, I had them at 29/33 which I think was a mistake for the track.

 

this is from Michelin website

TPMS doesn't like cold
pressure under 26 if you are using the "Circuits" mode

The best thing to do if the pressures get above 35 is to keep a pressure gauge in the frunk then, hot pit and adjust pressures - takes 2 minutesj

 

33 front is too high for me.
I met a couple of Michelin support teams on track doing my Euro Delivery and they told me 29F 33R and that's the cold psi in the door, so easy to remember. I try to aim for 30 all around because if I cant get them to 29F, 28F doesn't feel right. Rear just needs to stay under 33R but 31 is better.

 

yeah, I think everyone has a different "feel" for what pressures are best for their driving style... most often my best laps are at 32-33f and 34-35r, but car type, engine location, suspension and alignment settings I would expect, would all influence that feeling

 

And depends on grip level asphalt and ambient temps as well...

 

Trying 24/28 cold next time, I like an oversteer.

 

I see 6-8 psi increase from heat build, so morning cold pressures are 24/26 for a 30/32 hot pressure. I find 30-32 give me a good balanced feel in the car. Over 34 and the car just slides and feels greasy.

 

Ditto.

 

Or try a pyrometer probe (not IR) to be more accurate, but you need a buddy to do it while tires are still hot, especially if you have 5/6 pint harnesses



this is from and old Motortrend article GT3RSat the bottom

 

I'm generally starting at 24/25 Cold then resetting to 29/30 hot. Pretty even tire temperature at around 160F depending on track temp. Last track day on a warm track 28/30 hot seemed to work well on older cup2s to combat understeer, but it takes about 3-4 laps to get up to temp.

I agree with the consensus, higher than 34 on the rear and things get gnarly, much worse then the GT3.

Every track day there is always someone on Cup 2s running 35+ wondering why they're struggling for grip...

 

Should be around 32 or 33 hot F and R, but it depends somewhat on your cambers and alignment. Probably best not to lean on the tires too much until pressures are at least in the high 20s, so be careful when starting cold in mid 20s.

 

I have my first two track days this weekend with my .2GT3.

Two questions related to tire pressures.

1. Has anyone run at the track with the Dunlops? Use similar pressure and the Cup2's?

2. It's going to be cold on Saturday (30F in the morning and 50F in the afternoon). I haven't run at the track in this cold of weather so I plan on taking it very easy. However, should I be adjusting my tire pressure because it's so cold in the morning?

Sorry if these are newbie questions.

Thanks for any help.

 

1. Yes and yes, pretty much the same.
Just start a little too high the first session, so maybe 26 all around cold. You will be too high when you come off the track but just bleed them down to say 32-34 This way you are definitely good, a bit on the high side but that's OK.

 

Thanks TRAKCAR!

 

I wouldn't trust that article graphic. 37 in the back on a GT3 will have you sliding through the corners (unless that's what you want). Any time my rears go over 35 it starts to tend to want to slide around. I can't imagine 37 would be fun unless you want to drift the corners.