Tyre pressure question
Discussion
I set mine at normal pressures when using them on the road. They work fine that way but they're very noisy because of the stiff side walls. You'll find that out soon 
On track you need to adjust the pressures when they're hot to make them work. When they're warm the pressures will go up considerably (after about 10 minutes on track) and the car will start sliding around, so drop the pressure to your road pressures and then try again. You may need to keep dropping until you find their hot sweet spot. Many of us running 17 inch Toyo R888s on 964s find that somewhere between 30 and 32 psi hot, all round, is the sweet spot. However the same pressures are not going to transfer directly to a 997 turbo hence why I say that you need to experiment a bit.
On track you need to adjust the pressures when they're hot to make them work. When they're warm the pressures will go up considerably (after about 10 minutes on track) and the car will start sliding around, so drop the pressure to your road pressures and then try again. You may need to keep dropping until you find their hot sweet spot. Many of us running 17 inch Toyo R888s on 964s find that somewhere between 30 and 32 psi hot, all round, is the sweet spot. However the same pressures are not going to transfer directly to a 997 turbo hence why I say that you need to experiment a bit.
boxsey said:
I set mine at normal pressures when using them on the road. They work fine that way but they're very noisy because of the stiff side walls. You'll find that out soon
On track you need to adjust the pressures when they're hot to make them work. When they're warm the pressures will go up considerably (after about 10 minutes on track) and the car will start sliding around, so drop the pressure to your road pressures and then try again. You may need to keep dropping until you find their hot sweet spot. Many of us running 17 inch Toyo R888s on 964s find that somewhere between 30 and 32 psi hot, all round, is the sweet spot. However the same pressures are not going to transfer directly to a 997 turbo hence why I say that you need to experiment a bit.
I would chalk up the sidewall / tread and go to the wearline, not much you can do about camber.. but as a guideline 30/32 hot won't be far out, go out on 27psi all round and do 5 steady laps come in and see where they are, then set to 30Fr/32Rr.. chalk up the side wall/tread and do another 5 laps and review from there, you might need to reset twice while the heat soak gets them fully up to temp, then you will have your hot pressures set, come back to it after lunch and measure again, and you will have your cold 'out' pressures, go easy for the first few laps tho' to get them up next time out or you will be off in no time..!On track you need to adjust the pressures when they're hot to make them work. When they're warm the pressures will go up considerably (after about 10 minutes on track) and the car will start sliding around, so drop the pressure to your road pressures and then try again. You may need to keep dropping until you find their hot sweet spot. Many of us running 17 inch Toyo R888s on 964s find that somewhere between 30 and 32 psi hot, all round, is the sweet spot. However the same pressures are not going to transfer directly to a 997 turbo hence why I say that you need to experiment a bit.
With only -1.0 neg camber on the front, if you go too low, your front left tyre will be destroyed after an hour, Work to a chalk wearline just over the shoulder of the tread blocks, and the tyres will last a lot longer, swap the fronts across at lunchtime if necessary.
Check it with a heat gun if you have one and see how uniform the temps are across the tyre width when you come in, more pressure to get heat into the middle, less to run a cooler middle, but keep sight of the wearline on the shoulder..
Edited by RatBoy M3CSL on Tuesday 22 May 15:07
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