malmasri

These questions are directed to the fellow owners who drive the RS where it is intended to be driven
1-What is the cold tire pressure prior to running a track session assuming OE wheels/Tires and ambient temp 70's with AIR in the tires?
2- Anyone Runs with Nitrogen: same question Cold pressure and what is the Hot readings on them?
Thanks.
M.A.

malmasri

Did I post in the wrong forum or no one checks tire pressure?

TRAKCAR

I think not many drive on OEM tires on the track...I do not kinow what the best hot temp is for OEM tires.

Cold temp depends on humidety, temp and track temp.
With Nitro you want to get to the same hot temp, so you start higher on cold temp.

malmasri

OE tires are M.P sport cup??? what other better track tires ( except Hoosier) are out there?

Bob Rouleau

OEM Sport Cup on the RS is 34F 36R hot. Cold pressures depend on ambient temps. As a rule start 6 lbs lower and adjust after.

Erik

Bob must be in Canada :-). In FL we start 10 lbs under and I still end up bleeding.

tcsracing1

i use 18" Toyo R888. i started with 32 psi and went down as low as 25 psi (in canada)

malmasri

What do you do with the silly TPMS when 6 lb or less below what the system is set up for ( other than the obvious ie ignore it)

tcsracing1

Mine is disconnected

box01s

Michelin Care & Feeding brochure for the MPSC tire:

http://www.tirerack.com/tires/tirete...nd_Feeding.pdf

Ideally use a pyrometer to measure for recommended max temps for this tire.

From the brochure: Michelin®Pilot®Sport Cup tires are designed to operate at pressures ranging from 32 psi to 36 psi hot. A cold pressure of around 25 psi (front) and 28 psi (rear) should be a good starting point, which can then be fine-tuned to your car’s setup and your driving style. You should never go below 20 psi cold, to avoid any risk of bead unseating.

malmasri

You mean you have dead wt in the car???

tcsracing1

i assume my stock wheels still have active sensors. but my track wheels do not.

I believe Mooty had his dealer deactivate the dash warning light.

thus it was already done for me when i bought the car.

i dont think the car has a seperate computer for the wheel sensors? so i dont think there would be any dead weight?

box01s

See Care & Feeding Michelin Pilot Sport Cups at this link:

http://www.tirerack.com/tires/tirete...nd_Feeding.pdf