tire pressure
Thread Starter
Pro
Joined: Feb 2011
Posts: 605
Likes: 1
From: Helotes TX
tire pressure
before you even start I know how to use the owners manual and where to look for the tire information. What I am asking is what tire pressure grandsport owners are running in their tires to get the best tread wear out of them. My DIC says i have 32 lbs in them but I do not trust it.
Team Owner
Joined: Mar 2012
Posts: 49,384
Likes: 3,924
From: Best Island in the U.S.
St. Jude Donor '12 thru '17
Run what the owner's manual and door sticker say, which is 30 psi unless you race it.
If you don't trust the DIC reading have you compared it to what a good tire gauge says?
If you don't trust the DIC reading have you compared it to what a good tire gauge says?
Racer
Joined: Apr 2012
Posts: 314
Likes: 4
From: Ontario
I follow the factory specs. Tire pressure will easily go up 4-5 psi under normal driving at fifty mph on a normal summer day. I would imagine that the car and tire manufacturers have a pretty good handle on what works. I'm not about to second guess them. Our DIC can read up to two psi out on individual tires when all are set to exactly the same pressure. Long tire life is more dependent on alignment. Factory specs seem to wear the insides of the front tires but gets you around the track better.
Last edited by Keith Tedford; Jul 26, 2013 at 06:19 PM.
Race Director
Joined: Oct 2005
Posts: 14,999
Likes: 200
From: Bay Area Ca.
Do a search regarding a forum member "Evil Twin" regarding tire tuning.
It does not specifically deal with the GS though. He was a 35 year senior level GM engineer and worked on the C5 testing. He also worked with NASCAR concerning tire tuning.
He says that testing showed the best performance and tire wer at 30 lbs HOT!
In short the sticker is put there by GM so people do not inflate the tire to the level read on the tire itself, which is the max inflation under max load.
For myself I run about 27 cold and in 70-90 degree weather I see 30-32 when tires re warmed up.
He states that 30 is optimal and trying to keep in between 30-32 hot is best.
Tire tuning can get involved with temp taken at the track under a strict protocol.
Loads of threads with his posts.
For my own experience I ran the 30 cold for the first 30,000 miles and although I switched sets 3 times the longest run were the GY SC F1 tires and in the end they showed more wear in the center. Sorry no measurements but it was obivious that they were over inflated.
Just some information to ingest concerning tire tuning.
It does not specifically deal with the GS though. He was a 35 year senior level GM engineer and worked on the C5 testing. He also worked with NASCAR concerning tire tuning.
He says that testing showed the best performance and tire wer at 30 lbs HOT!
In short the sticker is put there by GM so people do not inflate the tire to the level read on the tire itself, which is the max inflation under max load.
For myself I run about 27 cold and in 70-90 degree weather I see 30-32 when tires re warmed up.
He states that 30 is optimal and trying to keep in between 30-32 hot is best.
Tire tuning can get involved with temp taken at the track under a strict protocol.
Loads of threads with his posts.
For my own experience I ran the 30 cold for the first 30,000 miles and although I switched sets 3 times the longest run were the GY SC F1 tires and in the end they showed more wear in the center. Sorry no measurements but it was obivious that they were over inflated.
Just some information to ingest concerning tire tuning.
Last edited by Boomer111; Jul 26, 2013 at 07:48 PM.
Thread Starter
Pro
Joined: Feb 2011
Posts: 605
Likes: 1
From: Helotes TX
good info
Good information, my 2011 Grandsport front tires are wearing in the center of the tire with 8K miles on it. Where do the tires wear if the alighment is off? Inside, outisde, middle,??? and with an agressive alignmnet will the rear tires wear as well?
Le Mans Master
Joined: Sep 2007
Posts: 5,526
Likes: 16
From: Mechanicsburg Pennsylvania
Out of alignment/camber wear is most often on the tire edges - inside or outside.
Excessive wear at tire center is usually an over inflation issue.
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