loopsandsounds

This^ I found I could never keep the rear pressures below 40 unless I started below 26. I also found at lower than 26 the tire is just too soft so you need to take a few easy laps to warm up the tire and increase temps. There still isn't a goldilocks cold pressure but the side bypass has helped tremendously.

greenhorn

TRAKCAR is spot on in his suggestion.

In medium temps (17-23 celsius) I usualy find the cold pressures to go up by 0,5 bar (7psi) during a session. So aiming for a 30-32 psi hot window 24/25psi starting point seems optimum.

Once or twice went too low with the cold pressures and that results in an uncomfortable combination of overheated underinflated tires.

Wish there was a tire temp indicator on dash like the one in M4GTS. Getting the tire pressures and temps spot on is essential for an enjoyable track experience.

TRAKCAR

THIS!! Porsche is behind BMW on this one!

Nizer

and rollbar and 5-lug wheels!

Nine1won

Like Trackcar said...32 hot all 4.

Jono809

+1 for what Trackcar said...

I run 30psi hot on tracks with slower corners and 32psi hot on tracks with faster corners, just like the extra sidewall support...

Also agree about the TPMS warning lights that you get if you start below 26psi...you could start at 26, then keep bleeding after each session if the warning light bothers you, or just deal with the light like I do.

tstafford

Agreed.

If it helps make people more comfortable - PSDS at Barber last week had TPMS lights on all cars in the AM and simply said to ignore it. Temps came up during the day as you'd expect. If they're good with it, I am too.

JanStuart

I was doing 30/30 at Sebring, but found the rear rolled a little much. Bringing the rear up to 32 did the trick. RE the warning light, after the first run, when you come in with hot pressure, set the Circuit to the current pressure as target, remembering to say YES every-time you start the car, and the warnings will no longer bug you. (camber at 2.5 front, 2.25 rear)

LandShark

Thanks all. I was running 33psi hot my first MPC2 track day, and pretty happy with it. Will try 32psi next time on the track.

Mika911

Surprised to see in the Sportauto article of the Manthey Racing GT3 RS that they ran 1.8bar/26psi hot pressure allround. Seems extremely low and would mean triggering the warnings. Wonder if this was a mistake or truly best for minimum laptime.

ms550

Tires rollover at any less than 35 on my GT3.

Footsoldier

As others have said, this is exactly right. Seems like it takes two bleeds to get stable at 30/32 then you are set for the day. Probably taking 6-8 psi out of the starting road pressures, depending on weather.

just need to remember they need to be warmed up to pressure again after an extended pit stop, and also that you need to put the air back in before driving home!

TRAKCAR

Exactly, I have a little cigarette lighter powered compressor.

993tt

Going to track my GT3 for the first time on thursday so I'm looking for tire pressure advice but I find this very confusing since it totally goes against what everyone else is saying.

No one that have any comments on this advices from Michelin?

mdrums

I pretty much folllow what Michelin says. I don’t have the roll over and outside wear issues others have. I’m runing -1.7 camber. I start at 28 front and 30 rear...bleed down from there to running 33 front 35 rear hot.