Hi Guys,
What should be the right tyre pressures (psi in cold/ hot) on track use? I've got 19" Michelin Pilot Sport Cup tyres on 997 turbo.

 

Cold = what ever it takes - not too low of course, but hot temperatures rear are more challenging than front. This may be due to the engine heat at the rear but my butt-dyno results are:

Front 2,2 - 2,3 bar (32-33 psi) (no problems here)
Rear 2,2 bar (32 psi) yields by far best results. When ever rear pressure goes even anywhere close 2,4-2,5 bar (35-36 psi) the traction is lost.

Michelin recommends that optimal operating temperature for Cup tyres is 70 - 100 C (158 - 212 F). Above figures give temperatures that match this requirement.

Hope this helped!

-ESu

 

cold temps will vary, and the best way it to find out is by trial and error. Try watching your tire edge to make sure your wear line isn't too far down (under pressure) or not enough (too much).

 

I always liked 40 psi hot on my MPSC with my 996, use a pyrometer and try for 160+ degrees as evenly as possible. Quick tip, measure your temps immediately after your run, it's amazing how fast they cool down. Also helps to keep a log.

 

40 front 45 rear Hot