Proper air pressure.
Thread Starter
Racer
Joined: Mar 2012
Posts: 420
Likes: 9
From: Bow New Hampshire
Proper air pressure.
Last week the 10 year old tps units in my 05 were replaced with oem units. I set the air pressure at 30 psi, (Firestone Firehawks run flats). Today I took the car out for a 30 mile check run, tie pressures stabilized at 35 psi in all four wheels. I don't recall seeing that type of increase before, maybe from 30 to 32 psi. 35 psi is a bit stiff in a car with the Z51 suspension to start with. Should I reduce pressure to 28 cold and see what I get when they heat up or just leave alone.
Thanks
Thanks
Race Director
Joined: Oct 2005
Posts: 14,999
Likes: 200
From: Bay Area Ca.
In my experience 30 cold goes to 35 with normal highway driving with tempetures above say 65*.
As mentioned tire wear is the truth of the matter regarding just what the air pressure is doing regarding tire patch contact with the road.
I ran 30 hot for awhile and experienced some accelerated wear at both inside and outer edges. i do not think running 28 cold will do much harm and seeing if the ride is more desirable I would go for it. Just check for additional edge wear. I was running 26-27 cold in the summer and seeing 30-31 hot.
Going to non run flat tire's will be benifical too in aiding a softer ride.
Z51 and GY RF's I found to be way to harsh also.
As mentioned tire wear is the truth of the matter regarding just what the air pressure is doing regarding tire patch contact with the road.
I ran 30 hot for awhile and experienced some accelerated wear at both inside and outer edges. i do not think running 28 cold will do much harm and seeing if the ride is more desirable I would go for it. Just check for additional edge wear. I was running 26-27 cold in the summer and seeing 30-31 hot.
Going to non run flat tire's will be benifical too in aiding a softer ride.
Z51 and GY RF's I found to be way to harsh also.
Last edited by Boomer111; Apr 16, 2015 at 10:55 PM.
Thread Starter
Racer
Joined: Mar 2012
Posts: 420
Likes: 9
From: Bow New Hampshire
In my experience 30 cold goes to 35 with normal highway driving with tempetures above say 65*.
As mentioned tire wear is the truth of the matter regarding just what the air pressure is doing regarding tire patch contact with the road.
I ran 30 hot for awhile and experienced some accelerated wear at both inside and outer edges. i do not think running 28 cold will do much harm and seeing if the ride is more desirable I would go for it. Just check for additional edge wear. I was running 26-27 cold in the summer and seeing 30-31 hot.
Going to non run flat tire's will be benifical too in aiding a softer ride.
Z51 and GY RF's I found to be way to harsh also.
As mentioned tire wear is the truth of the matter regarding just what the air pressure is doing regarding tire patch contact with the road.
I ran 30 hot for awhile and experienced some accelerated wear at both inside and outer edges. i do not think running 28 cold will do much harm and seeing if the ride is more desirable I would go for it. Just check for additional edge wear. I was running 26-27 cold in the summer and seeing 30-31 hot.
Going to non run flat tire's will be benifical too in aiding a softer ride.
Z51 and GY RF's I found to be way to harsh also.
Thanks
Safety Car
Joined: Feb 2007
Posts: 4,684
Likes: 107
From: Opelika Alabama
Last week the 10 year old tps units in my 05 were replaced with oem units. I set the air pressure at 30 psi, (Firestone Firehawks run flats). Today I took the car out for a 30 mile check run, tie pressures stabilized at 35 psi in all four wheels. I don't recall seeing that type of increase before, maybe from 30 to 32 psi. 35 psi is a bit stiff in a car with the Z51 suspension to start with. Should I reduce pressure to 28 cold and see what I get when they heat up or just leave alone.
Thanks
Thanks
Thread Starter
Racer
Joined: Mar 2012
Posts: 420
Likes: 9
From: Bow New Hampshire
Can't ditch them, too much money invested in them, besides it would be just my luck to get a flat. I have had a number of vettes and this one rides the best by far. I was just concerned about the tp increase when hot, Based on responses it doesn't seem like a big deal. I just don't recall the pressures prior to the tpms change.
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