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Discussion Starter · #1 ·
I have a standard TME with SO1's, Ralliart state tyre pressure of 1.9bar rear and 2.2 front, without having to convert to BAR's I have been told anything from 26 to 39 psi for both front and rear. Has anybody played about with the tyre pressures for optimum grip as I am not interested in tyre life. I do not use the car on track days at the moment just the road but track info would also be beneficial.

Thanks

Roger
 
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Discussion Starter · #2 ·
Putting more pressure in the front will make the tire too hard and therefore the car will understeer (even more). Put less pressure and the car will be too soft and under hard driving the tire might get dangerously used on the outside without making the car faster.

Putting more pressure in the back will make your Evo oversteer more, so that could be interesting http://www.ltregister.f9.co.uk/graphics/biggrin1.gif border|EQU| 0 align|EQU| absmiddle > [img]http://www.ltregister.f9.co.uk/graphics/biggrin1.gif border|EQU| 0 align|EQU| absmiddle > [img]http://www.ltregister.f9.co.uk/graphics/biggrin1.gif border|EQU| 0 align|EQU| absmiddle > Putting less pressure would just make it oversteer less and thus understeer more.

I tried out all the different settings, the factory are the best (maybe 2,0 in the back instead of 1,9 just for the fun of it) [img]http://www.ltregister.f9.co.uk/graphics/happy1.gif border|EQU| 0 align|EQU| absmiddle >

Andre, if you are reading this, maybe we should put 3 bars on the back?! [img]http://www.ltregister.f9.co.uk/graphics/biggrin1.gif border|EQU| 0 align|EQU| absmiddle >
 
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Discussion Starter · #3 ·
I asked the same question on the evo list.

Answer 2.2 bar |EQU| 32 psi.

Which means 1 bar |EQU| 15psi.

Thanks Scott
 
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Discussion Starter · #4 ·
I upped the pressure by 0.3bar to 2.5bar at the front and 2.2bar at the rear. For my driving style it's good. Generally you have to find out by yourself which pressure suits you best. But don't forget to check pressure when the tyres are cold and do it always at the same place to get consistent results.

Cheers

Mike
 
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Discussion Starter · #5 ·
Remember that the figures on the sticker on the car are in kg/cm2 which is not quite the same as bar.

1 bar |EQU| 1.019716 kg/cm2 which means :

2.2 kg/cm2 |EQU| 2.15 bar or 31 psi

1.9 kg/cm2 |EQU| 1.86 bar or 27 psi

I know this is being 'nit picky' because it hardly effects figures but just remember when higher figures are quoted then the difference will be more dramatic between the correct and incorrect 'bar' conversions.

Personally I use a couple of psi over the recommendation in my tyres but I have always done that on all the cars I have owned.
 
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Discussion Starter · #7 ·
Is it correct that the difference in front and rear pressure is because the car is nose heavy and this pressure difference keeps the rolling diameters of the tyres equal to prevent the centr diff winding up when cruising?
 
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Discussion Starter · #8 ·
Can Claudius be stripped of his four stars?! To reduce understeer one should RAISE the tire-pressure on the front tires!!! Claudius (*) states the opposite! Very wrong.

For example, to reduce understeer one could:

-raise front tire-pressure (relative to rear)
-wider tires on the front
-wider rims on the front (with same tire size front and rear)
-fit (bigger) stabilizer on the rear
-increase negative camber on the front
-wider track on the front
 
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