Tyre pressure.

[obi_waynne]

What pressure do you set? I guess you measure when warm. Anyone use Helium or another gas that does not expand as much as air?

 

[fingers]

I run my tyres at 20psi. By the time I have done a burn out and warmed them up they are probably at 23-25psi which is about right for the strip.

 

[old-git]

Hi

Nitrogen is used in F1 cars, as it is supposed to be less affected by temperature. See :

http://www.buyrite-tyres.co.uk/tyrecare-source.html

Helium would reduce the unsprung weight slightly

 

[old-git]

You are looking for an even temperature across the whole width of the surface of the tyre that is in contact with the track. The only practical way of doing this that I know of is to run the car then quickly take readings (if possible before you get back to the pits) across the all driven tyre widths.

If the centre is hotter than the edges then you are running too high a pressure. If the edges are hotter than the centre then the pressure is too low. it is a matter of trial and error.

Differences in temperatures between the tyres on the same axle indicates uneven loading, but that is another and more complicated issue

 

[obi_waynne]

Cheers steve - some useful stuff there.