Mickey Thompson tire air pressure

[cobra 53]

My car, NAF 289 with approx 2250lbs, has got Sportsman ST Radials.

F 245/60/15, R 275/60/15.

With the current air pressure of 28 lbs at all 4 corners the speed over 70mph feels like "flying". The front or steerwheel feeling is similar to a "molten Italian pizza cheese".

Would a lower air pressure help? Any suggestions?

Thanks
Rico

[Fullchat289]

Hi, Rico..

I just rememberd I forgot to answer this quesiton in your email. I run 26/28 psi, Frt/Rr.

- Allen.

[FWB]

i get that feeling too on my car, i tend to run more psi on the rear than the front, i stick to 30 front and 33 or more in the rear my car is heavier 3000 lbs

[Silverback51]

With the current Avons I run 22 front and 20 rear. With the Goodyear BB's I ran 20 front and 18 rear.

In my opinion for a 15 inch tire your tire pressures are way to high.

[jopper]

I ran 22psi with BFG radial TA. It gives better grip and softer ride. Not that the BFG had that good of a grip to begin with.

[Tedster]

Tire pressure should be 1 psi for every 100lbs of car weight that should get you in the ballpark. From there you can adjust your tire psi to your liking.

[1blackbb66]

Tedster is pretty much right on. On a recent track day I was advised by a friend to run 1 lb for every 100 lbs of car weight. My car weighs 3405 with me in it and I was runnin 32 psi hot. The difference in grip was amazing as i had been runnin about 36 psi hot.
More is not better when it comes to getting the maximum grip from a tire.

Ray

[cobra 53]

Today with sunshine I was driving approx. 100 miles using different roads like motorway, nice mountain roads and streets in town. I feel ok with the decreased tire pressure to F 25 / R 27 psi. The grip is much better, as well as the response.
The new problem now is the vibration of the steerwheel passing 75 to 80 miles/hour. Back home I could find out that the wheels have to been balanced. The car came to me two months ago from the USA with new FIA wheels and brand new tires!!!!
That shows the good quality of the new tires.
I hope balancing will stop the problem.

Thanks for your help.