Tyre pressures 32R's
Turbo Mini Forums

Hi Guys, what tyre pressures do you use on your 32R's?

Also if you had a 32R on a 5" wide rim, and a 7" wide rim, would the ideal pressure be the same??

Team Racing

28 psi front and back in mine.

Unsure about rim width making a difference though

Paul

I seriously doubt it!

I'd beleive that narrower rim will need higher pressure.

Two weekends ago in a yellow marcos, we started with 28psi on a 6" rim. The pressure was well over 40 after some rounds on track. I'd guess that 25ish would be a godd starter for track use. However, I've got little to no experiance on this. Have a go!

Paul, what width are your wheels?

so what characteristics would an under and over invlated tyre give?

Team Racing

mine are 6" Jim, I would guess that a lower tyre pressure would be of advantage on a 7" rim with a lot of negative camber as it would give the best tyre to road contact when going straight or round a corner - like I say its a guess.

paul

I seriously doubt it!

28 for me as well 6 3/4 rims

28 for me when not on the strip, 10x7's but no real miles to say good or bad!

id better get the pump out then.....lol

28psi cold is WAY to much on track, that's for sure.

Edited by Vegard on 12th Sep, 2008.

I have used 26 psi on track with my setup. I have 4.5" rims though...

2 Bar for me.

My eyes can't read the smaller graduations on the gauge.

Saul Bellow - "A great deal of intelligence can be invested in ignorance when the need for illusion is deep."
Stephen Hawking - "The greatest enemy of knowledge is not ignorance, it is the illusion of knowledge."

thats a lot though, is that on 032rs?

2 bar is 29.4 psi

About 30psi on track with 6.5J x 10s and 24psi rear

On 5th Sep, 2011 Vegard said:
I stand corrected. You should know

website:- http://www.terryhunt.co.uk

Edited by Paul S on 13th Sep, 2008.

Saul Bellow - "A great deal of intelligence can be invested in ignorance when the need for illusion is deep."
Stephen Hawking - "The greatest enemy of knowledge is not ignorance, it is the illusion of knowledge."

Richminiturbo found this and posted it on TMF not long ago. If you know the ideal tyre pressure for the tyre, then you can tune the pressure to that. I thought it was very interesting, but at the same time it became obvious

Im sure there is an ideal operating range for the A032s, that is all you need

The ADVAN A048 needs to operate in the 33 to 36 psi window for maximum performance. So you have to figure out how to make your tyres reach this window when you need maximum performance. A hillclimb car may start with tyre pressures in the window because the tyre pressures are unlikely to climb very high in a short 40 second run with no warm-up lap. A big heavy car like one of the Yokohama V8 racing utes competing in a 10 lap race may start with a pressure of 28psi. The big heavy high horsepower car is going to work the tyres hard so the tyres will build a lot of heat. As the air in the tyres expands the pressure goes up. So the ute may reach the pressure window by lap 3! The first step to figuring out the best tyre pressures in your ADVAN A048s is to start with a tyre pressure you think will rise beyond the operating window then go out on the track and do your normal race distance. Come straight in and bleed pressure out of the tyres so they come back to say 35psi which is in the middle of the pressure window. Then let the tyres cool completely and measure their cold pressure. This is a good indication of what your starting pressure should be. Further refinements can be made by measuring the tread surface temperature variation with a pyrometer and adjusting starting pressures depending on track and ambient temperatures.

Edited by Sprocket on 14th Sep, 2008.

Interesting, and makes sense in a way, but what happens for instance when you have the DON weighing 440kg on these tyres? I know that if we had 33-36psi in when HOT then it would be awful, as the car isn't heavy enough.

What you have to remeber tom is that the paragraph above is aimed at normal road use or track use where corners are concerned

On a straight 1/4 mile, lower pressures that promote better grip, rather that cornering stability is of higher importance

Im sure you know that :)


Oh on weight wont matter, as if the tyre works best at 'X' psi warm, then weight wont matter, as the tyre wont be worked as hard, so you will start with a higher cold pressure.

Edited by Sprocket on 14th Sep, 2008.

Cold Vegard.

You are looking for a hot rise of no more than 3-4 psi. Any more an the tyres are under inflated and less and they are over!

On 5th Sep, 2011 Vegard said:
I stand corrected. You should know