When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission. Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network.
I don't know more than GM, I use 30 psi cold as they recommend as they have tested the tires and the car in all conditions. If you track the car they have recommendations for that too.
I don't know more than GM, I use 30 psi cold as they recommend as they have tested the tires and the car in all conditions. If you track the car they have recommendations for that too.
My '13 011 had the same Michelin tires and recommended pressures were 37 front/44 rear.
It appears that the C8 wants 30 all around.
What do you guys run your tire pressures? Mine came from the dealer at 37 all around.
TIA
Your '13 didn't have Michelin PS4 tires, because those are brand new, with the C8 the first car to use them. Tire sizes may have been different, too. Unless you do some testing and find a reason to change, why not stick with GM's recommendation, since they likely did lots of testing.
I'm running 30 psi because that's what the sticker says. The tires hit 33-34 when the cluster shows them at "Normal" temperature. Hasn't been warm enough here to test out traction and different pressures.
At 30psi you risk almost an immediate risk of under inflation with a small temperature drop. I would much rather ride on slightly over inflated tires than a tire 1lb under pressure tire. Good reading here. https://www.caranddriver.com/feature...tire-pressure/
Last edited by MagicGlass; Mar 24, 2021 at 02:46 PM.
I run the recommended as the tires warm up to the correct temperature for both ride and handling quality. Why people don't follow what the engineers say is beyond me.
The C7 cold tire recommendation was also 30 psi, which I always used. It is important to note that starting with that cold pressure had the tires routinely running 34-35 even in street use after warmed up in the temp range summer tires are supposed to be utilized.
No way would I start at 34 psi cold, which would put the tires at 38-39 psi when warm/hot. At Spring Mt., inflation was 26 psi cold for that car.
At 30psi you risk almost an immediate risk of under inflation with a small temperature drop. I would much rather ride on slightly over inflated tires than a tire 1lb under pressure tire. Good reading here. https://www.caranddriver.com/feature...tire-pressure/
This is patently false. A C8 tire at 29 psi doesn't hurt a thing, in fact, you don't get a low tire pressure light until it's at 22 psi. At 30 psi, you aren't running a risk of anything but having the car perform as designed.
At 30psi you risk almost an immediate risk of under inflation with a small temperature drop. I would much rather ride on slightly over inflated tires than a tire 1lb under pressure tire. Good reading here. https://www.caranddriver.com/feature...tire-pressure/
If you read the article you provided a link to, you will see it recommends using the cold inflation number found on the cars door jam. I do, and it has never failed me. both in performance and longevity.
Too many uninformed "engineers" here. Just do as it says on the door and don't worry about how high it gets when you drive. It will return to the original psi when you put it away for the night. The only time adjustments may be required is if you are changing location with a major change in temperature or altitude otherwise chill.
Btw, the tires are run flats so I think it'll be ok if it drops 1 or 2 psi before you fill it back up due to a temperature drop. If its because you haven't checked in weeks or months, then that's a different story.
I actually discussed the cold tire pressure with a Michelin engineer. He is from nearby my home town and the subject came up as we were having old home week His advice was very specific. The 30 psi cold is there for a reason. Granted, this was for C6 cars at the time, but apparently the rationale has not changed.
My best advise is to read the tire sidewall for maximum pressure then split the difference as to what is on the door. I still recommend 33psi at 60 degrees
I am able to calculate a safe pressure for you, but need some data from you.
Goal of pressure advice is not to overheat any part of tire, when driving the maximum speed used( and wont go over for even a minute) .
then deflection counts.
That deflection is made by the pressure/ load combination.
Determining the loads on seperate tires , is the most tricky part in it all.
Your tires I can google by the sises, but if you give next, its more certain.
1 maximum load or loadindex
2. Kind of tire to dertermine the referencepressure, for wich maxload is calculated.
3 less important speedcode, to determine the speed for wich maxload is calculated.
From car , weights on tires in use.....succes with that.
Carmakers use GAWR's and so for fully loaded.
But most use is only driver.
Also need max speed you use, and wont go over for even a minute. carmakers use maximum technical carspeed, and 99mph you probably wont ever use, but be hounest about that.
I run those tires (Michelin Pilot Sport 4S) on my 911. Recommended pressures on the door plate for the 2017 C4S are 35 front and 45 rear for all tires. I have about 8,000 miles on those tires with no indication of uneven tread wear.
tire pressure
His advice was very specific. The 30 psi cold is there for a reason. Granted, this was for C6 cars at the time, but apparently the rationale has not changed.
