Got a set of 225-50-13 SO3s for auto x & some track days and was wonderin bout tire pressure base settings. Thanks Jimmdog

 

around 40 hot should be good. for the track start in the low 30's, they will come up 8-10 lbs depending on conditions.

 

From Hoosier:

Tire Pressure recommendations
Hoosier Tire typically require higher pressures than other brands.
Reference the following chart for suggested pressures:


Vehicle size recommended hot pressure cold pressure
1800-2200 lbs 39-42+ 31-36
2200-2600 lbs 40-43+ 32-37
2600-3000 lbs 42-46+ 32-37
over 3000 lbs 43-48+ 32-38

+ Higher pressures will improve the performance capability but will require a more sensitive feel to take advantage of the increase.

One characteristic of the tires is the tendency to "skate" initially (when inflation pressures are correct). It is important to resist lowering the pressure to attempt to eliminate this feeling. Dropping the pressure may improve the "feel" of the tire however it will also lower the performance and increase the wear on the tire.

Tire temperature recommendations
For best performance the expected temperature range will vary from track to track. Generally, optimum traction will be generated when the pit lane temps show 180-200 degrees.

Chassis setup recommendations
For optimum performance the tires will require around 3 degrees of camber. There will be a trade off in maximum performance to maximize wear. Generally 1/2 degrees less than optimum will result in the best compromise for wear and speed. Less than 2.5 degrees can result in excessive wear on the shoulder junction.
The tires should offer better performance with spring/shock rates higher than previous brands you may have run.


Russ

 

use the values of your tire temp in different areas of the tires to determine tire pressure and alignment settings.