| LENSJADE |
06-18-2012 11:01 PM |
Tire presure for superformance on street
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| vatdevil |
06-19-2012 01:44 AM |
For street, 18 psi works best for me. 24 for autocross.
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| Sawdust |
06-19-2012 04:06 AM |
I run 18lbs front & rear with no problems.
Stu.
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| jhv48 |
06-19-2012 08:03 AM |
I run 22.5 pounds both front and rear.
For you guys running 18 pounds, don't you notice flat spots after the car has been parked for a week or two on cold concrete? Front end shakes like they are out of balance? My Kumhos take about 5 miles of driving to smooth out after a week on cold concrete. In the summer, they smooth out after a mile or so.
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| Sawdust |
06-19-2012 10:57 AM |
I have never noticed flat spots or front end shakes
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| madmaxx |
06-19-2012 12:07 PM |
another question is does pressure very based on tire size, is 15" tires take same pressure as 17" tires
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| vatdevil |
06-19-2012 04:15 PM |
I use chalk or other means to mark the tire, then drive normally to verify complete tread contact. Keep lowering pressure until full contact. Do the same process when auto crossing. Running 275 and 315s on 18 inch rims.
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| scootter |
06-19-2012 09:36 PM |
I have the same 17" tires on my Superformance. 335 rears and 270 fronts. I run 24 PSI front and rear.
Scott
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| 289fia_cobra |
06-22-2012 04:28 PM |
The "general" rule I've used is 1-PSI for every 100 lbs. But the chalk method tends to be a good method during autocross since you have to adjust your psi's just before every run and usually start off higher than street.
For street, since I corner weighted my FFR to 2500 lbs ( 2496 officially but I gained 10 pounds since!) I set my pressure to 25psi front and rear.
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