Track Tire Pressures
Thread Starter
Burning Brakes
Joined: Apr 2009
Posts: 877
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From: Tyler, Texas
Track Tire Pressures
Looking to see what pressures owners like at the track. I'm planning a session or two tomorrow (MSR Cresson if any Rennlist members will be out there). I have the MPSC 2s.
Last edited by fishing; Sep 5, 2015 at 07:35 PM.
Drifting
Joined: Mar 2015
Posts: 3,111
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From: Austin, TX
I'm eager for some tribal wisdom to accumulate on the GT4 here. Some of the recommendation have been based on GT3 experience, but I've seen everything from 32, 34, and 36 hot all around to 31-32 F / 34-35 R hot. I'm also reading that 25F/28R cold is a good starting point to get to approximately the right place hot, subject of course to driving style, track, ambient temp, etc. Some of this variance may come from some prioritizing absolute grip rather than tire longevity too, I imagine.
Either way, sounds like cold pressures will need to be below 27, which makes wonder why TPMS throws a warning below that pressure even in Circuits mode and won't let you store a profile with pressures below that.
Either way, sounds like cold pressures will need to be below 27, which makes wonder why TPMS throws a warning below that pressure even in Circuits mode and won't let you store a profile with pressures below that.
Drifting
Joined: Mar 2015
Posts: 3,111
Likes: 23
From: Austin, TX
Was that your white GT4 out there in White group today? If so, I saw it a few times on track and found it in the parking lot but you were never around. Would definitely love to check it out if possible. I'll be there tomorrow in Garage 16 wearing a Flamingo Auto shirt. If I'm not there, I'll either be instructing my Blue student or hanging out in Yellow since that group makes the most sense schedule-wise when instructing Blue. Maybe we could meet up while Red is out?
Rennlist Member
Joined: Mar 2015
Posts: 1,505
Likes: 672
From: Austin, TX
Was that your white GT4 out there in White group today? If so, I saw it a few times on track and found it in the parking lot but you were never around. Would definitely love to check it out if possible. I'll be there tomorrow in Garage 16 wearing a Flamingo Auto shirt. If I'm not there, I'll either be instructing my Blue student or hanging out in Yellow since that group makes the most sense schedule-wise when instructing Blue. Maybe we could meet up while Red is out?
Would be happy to meet up and chat next time I'm out though.
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Nordschleife Master
Joined: Nov 2010
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From: Bay Area
Keep in mind that while these tire pressure recommendations being given are GOOD, they are for a GT3/rear engine setup.
My experience in with the boxster spyder/mid-engine has been to keep the pressures even on all 4 tires, FWIW
My experience in with the boxster spyder/mid-engine has been to keep the pressures even on all 4 tires, FWIW
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Joined: Jul 2007
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From: Ormond Beach, FL
Unless you are trying to band-aid chassis balance with tire pressure all cars should have the same HOT FR/R psi.
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I'm going to agree with Orthojoe here on tire pressure recommendation for the GT4 since I had the same experience with my R.
I don't think I would call playing with the pressures a band-aid. That is a trick one can use instead of drilling extra holes into an existing swaybar, replacing it entirely or in the case of the GT4 wrenching on it. Its a good way to learn, approximate it before modifications; if so desired.
PARAMETER .........TO INCREASE UNDERSTEER ....TO INCREASE OVERSTEER
Front Tire Pressure ............. Lower ................................ Higher
Rear Tire Pressure .............. Higher ................................ Lower
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Joined: Jul 2007
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From: Ormond Beach, FL
Agreed. Maybe band-aid wasn't the best word. Then again, we have done stuff like welding blades onto stock bars because we couldn't find softer ones. Now THAT is probably a band-aid. I agree though that the ability to adjust tire pressures to help things is a powerful tool often overlooked. If the balance is right, square is best.