mustangmann
"SHOTYME"
Hey what air pressures do you guys run on your SHO's? I usually try to keep 34-35 but that just looks low sometimes. I believe it says 34 on the sticker in the door.
Tire air pressures
- Thread starter mustangmann
- Start date
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Silvapain
New Member
The door sticker is for the OE tires only - refer to the max tire pressure values on the tires themselves. Also, don't go by how the tire looks, always go by cold pressure.
FWIW, I run 36psi cold in all four tires.
FWIW, I run 36psi cold in all four tires.
stephen newberg
SHO Member
You need to adjust the pressures to the particular tires, to your car's suspension modifications, and to what you want the car to do in a handling way. At the moment I am running Yokos and they seem happiest for close to neutral steering with my modifications at 36lbs front, 30lbs rear.
pax, smn
pax, smn
whiteman_01
Well-Known Member
This may sound stupid, but when i got my Nitto NT555's i email'd Nitto to see what psi they recommend for best wear. The tire has a max psi of 44, they said in there testing, the best psi was right at 40. So thats where mine have been since. They still look new too.
stephen newberg
SHO Member
It may sound counter intuitive, but I would not be interested in driving a set of tires that did not show wear. I want something a bit more sticky than that. But I do drive the back road curves rather aggressively.
pax, smn
pax, smn
mustangmann
"SHOTYME"
Wow, maybe every set of tires I have ever had on this car since I have owned have all been ran too low on air pressure. I have always just stuck with the 34 psi what it says in the door. I am on my third set of tires now since I have owned the car and can't seem to get more that 30,000 on any of them! Perhaps this is why?!
So, is the general rule of thumb to run them slighty below the max psi on the sidewall knowing that when they warm up they will be right about max psi???
So, is the general rule of thumb to run them slighty below the max psi on the sidewall knowing that when they warm up they will be right about max psi???
stephen newberg
SHO Member
No, I do not think that would work as a general rule of thumb. You really need to tailor this to the particular tire and your driving style. Running a very high pressure, that is near the limit for the tire, will produce a stiffening on the sidewall but at the cost of the center of the tread for higher tire wear. Over inflation produces those sample wear patterns you see in photos at the tire stores where the middle of the tire is worn out to a concave extent.
So, if the tire tends to roll under, that is the sidewall is not as stiff as you need for your driving style, you might want to run the pressure higher and try it. But if the tire is sliding out on you, you might want to try decreasing the pressure a bit to get a wider contact patch. Overdoing it in either direction will produce undesirable effects, however, sometimes directly opposite of what you are trying to produce.
Basically, you need to experiment. I tend to go up and down in 2 psi increments and then run trials on the same road at about the same speeds to see what happens. And it helps if the outdoor temp is about the same also, but if not, you want to get the tires well warmed up beforehand as they will then vary a lot less, so a good drive before starting your testing helps.
pax, smn
So, if the tire tends to roll under, that is the sidewall is not as stiff as you need for your driving style, you might want to run the pressure higher and try it. But if the tire is sliding out on you, you might want to try decreasing the pressure a bit to get a wider contact patch. Overdoing it in either direction will produce undesirable effects, however, sometimes directly opposite of what you are trying to produce.
Basically, you need to experiment. I tend to go up and down in 2 psi increments and then run trials on the same road at about the same speeds to see what happens. And it helps if the outdoor temp is about the same also, but if not, you want to get the tires well warmed up beforehand as they will then vary a lot less, so a good drive before starting your testing helps.
pax, smn
stephen newberg
SHO Member
Yes, the 6 lb difference is what I am running with these Yokohama Advan S.4s. With my previous Bridgestones, I found it worked better with a 4 lb difference and was, IIRC, using 36 front and 32 rear. They had remarkably strong sidewalls, though. After the Yokos are done, I am very likely to go back to the Bridgestones, which I found to be better handling tires under most conditions, though also a bit more expensive. Tires seem to fairly regularly be one of those unusual situations where you actually do get what you pay for.
pax, smn
pax, smn
egroce11
New Member
Couln't help being a smart azz. We found the best pressure for mine was 63 lbs all the way around.
In reality, I run around 36lbs on the dd car.
In reality, I run around 36lbs on the dd car.
mustangmann
"SHOTYME"
I am just looking to get the max life out of the next set of tires I get. I am putting on a set of Falken Ziex 912's this week and just want to make sure I have the right pressures in them. I don't really care so much about handling, it is a daily driver and I don't really race around or anything like that. Thanks for all the good input!
luigisho
SHO Member
Look at the speed rating for the tire. There are different compounds that are harder or softer and that can affect tire wear as well as handling characteristics.
Racer X
SHO Pilot, Retired
36 on the street, and 44 on the track are my magic numbers.
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