Tire pressure question
Le Mans Master
Joined: May 2005
Posts: 6,660
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From: FORT LAUDERDALE FL
I know that when I drove mine for the first two times I was shocked at the ROUGH ride in "tour" mode...then I checked the pressure to find 34 all around. After dropping back to 30 it's 100% better. FWIW on over inflating. I don't think that these tires like over inflation.
Race Director
Joined: Jul 2010
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From: Upstate NY
I always check the cores to make sure they are well seated and check the pressures on any new vehicle or when getting new tires or doing anything that might disturb same. I have been running my tire pressures at 32 cold, when hot they have passed 35 PSI but I don't recall ever seeing a excess pressure warning from OnStar or on the DIC.
Advanced
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From: Martinsburg WV
E-Ray, 3LZ, ZER, LIFT
Joined: Sep 2007
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From: NE South Carolina
I know that when I drove mine for the first two times I was shocked at the ROUGH ride in "tour" mode...then I checked the pressure to find 34 all around. After dropping back to 30 it's 100% better. FWIW on over inflating. I don't think that these tires like over inflation.
My modified Corvair used low pressure in the front tires. With OEM tires the recommended front tire pressure was 16 psi. That was to reduce front grip and the resulting oversteer!
Last edited by JerryU; Mar 11, 2017 at 03:02 PM.
Melting Slicks
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From: Baton Rouge LA
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Le Mans Master
Joined: Sep 2012
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From: Hagerstown MD
St. Jude Donor '15-'16,'18
IMHO anything between 30 and 35 psi is probably going to be fine for most folks. An important factor to keep in mind is all measurements should be psi when cold, i.e. car should not have been driven for at least 6 hours. Also, remember if you inflate your tires to 30 psi (cold) and the ambient temperature is let's say 80 degrees and then the temperature drops to 50 that night and you measure your tires first thing the next morning you are likely to see a drop of around 3 psi (cold). Also, when driving you can see a rise of as much as 7 psi especially if the ambient temperatures are high and/or you are driving aggressively. This is why lower readings are recommended at the track in most situations. I think around 26-28 psi is recommended. I know that I saw readings as high as 41 psi when I tracked my car at VIR. I started out with 33 psi (cold) in the morning. 
Pro
Joined: Feb 2015
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But it's not worth $50-$300.00 depending on the dealership. heh.
E-Ray, 3LZ, ZER, LIFT
Joined: Sep 2007
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From: NE South Carolina
^^^^^
Good thought, my calculations show hydrogen could save ~1.5 pounds per tire! To bad it's leak rate would be so high!
Good thought, my calculations show hydrogen could save ~1.5 pounds per tire! To bad it's leak rate would be so high!
Last edited by JerryU; Mar 14, 2017 at 11:04 AM.
Drifting
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From: Maple Ontario
Drifting
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From: Maple Ontario
Safety Car
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