Tire guys always pump the pressure up. Not sure why they do that 
High Tire Pressure!!
Thread Starter
Safety Car
Joined: Jul 2004
Posts: 3,770
Likes: 3
From: Dallas Texas
High Tire Pressure!!
Ok, I just got my new wheels on my car - pics coming soon. Anyway, they run at 40PSI so my DIC keeps flashing "High Tire Pressure". Is there a way for me to raise the threshold, or can the dealer reset it to a higher level?
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Thread Starter
Safety Car
Joined: Jul 2004
Posts: 3,770
Likes: 3
From: Dallas Texas
Thanks for the replies, but these are not stock tire sizes - more low profile. It says max pressure 50 psi on the tire itself. I guess I thought that lower profile tires should be run at higher PSI, or should all tires be run at 30 PSI?
Ya gotta luv it!
Race Director
Joined: Oct 2002
Posts: 16,477
Likes: 26
From: Gone
CI 6-7-8-9-10 Veteran
St. Jude Donor '03
Generally, the car, weight, and application determine the best tire pressure...the tire brand or size makes little difference.
Drop them to 30psi cold and enjoy!
Drifting
Joined: Jun 2007
Posts: 1,687
Likes: 45
From: San Jose CA
40psi is probably going to be on the high side especialy considering that depending on carcass thickness and exterior temp your tire pressure can increase 4-6psi while driving! When I got my new Kumho Ecsta MX tires installed the shop also left them at that. Felt like I was driving on ice, high pressure warning kept on going off and the car pushed realy bad. After a couple of miles I took a look at how the tires were wearing (easy to do on new tires) and noticed that the tire was not scuffed across the entire tread surface leading me to believe that the tire was over inflated causing it to take on more of a rounded profile reducing the contact patch.
So what I did was slowly reduce the pressure 1-2 psi at a time, put some miles on it and then check the tire wear to see if the full tread surface was contacting the road. Kept on doing this and finaly ended up with cold temps (temp right when the TPM system first displays pressure) back at 30psi on the front and 29psi on the rear. Car handled way better! So in a nutshell, save your self the trouble that I went through and go to 30psi as recomended, put some miles on it and then just take a look at the tire wear. There are usualy indicators on the tire close to the side wall that point out what is the proper edge of the contact patch and you want to see scuffing right up to this point indicating that the entire tread surface is contacting the road. If your air pressure is too low you will notice scuffing past this point due to excessive carcass roll.
So what I did was slowly reduce the pressure 1-2 psi at a time, put some miles on it and then check the tire wear to see if the full tread surface was contacting the road. Kept on doing this and finaly ended up with cold temps (temp right when the TPM system first displays pressure) back at 30psi on the front and 29psi on the rear. Car handled way better! So in a nutshell, save your self the trouble that I went through and go to 30psi as recomended, put some miles on it and then just take a look at the tire wear. There are usualy indicators on the tire close to the side wall that point out what is the proper edge of the contact patch and you want to see scuffing right up to this point indicating that the entire tread surface is contacting the road. If your air pressure is too low you will notice scuffing past this point due to excessive carcass roll.
Former Vendor
Joined: May 2006
Posts: 718
Likes: 1
From: Riviera Beach FL
What size tires are you running? My 315/30/18 work great at 32 lbs for street use,
Le Mans Master
Joined: Feb 2003
Posts: 6,369
Likes: 73
From: The line waiting to see Santa Claus stretched all the way back to Terre Haute, and I was at the end, Indiana
St. Jude Donor '08-'09-'10-'11-'12-'13-'14-'15-'16-'17-'18
You need 30-34 psi. Tire shops always put about 36 psi in them while they are on the lift, or have no weight on them. When you put the weight of the car on them, it goes up to about 40. I think the high pressure alarms go off somewhere above that. If you are running N2 you can put about 34psi cold, regular air 30-32 psi is plenty.
Burning Brakes
Joined: Apr 2002
Posts: 808
Likes: 0
From: The Villages FL
St. Jude Donor '13
You need 30-34 psi. Tire shops always put about 36 psi in them while they are on the lift, or have no weight on them. When you put the weight of the car on them, it goes up to about 40. I think the high pressure alarms go off somewhere above that. If you are running N2 you can put about 34psi cold, regular air 30-32 psi is plenty.
Sorry I have to call this (with respect)
Don
