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Tyre pressures?


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 pl0x said:

i run 40ish pound in all my tyres, some people say to high but meh they seem to last...

how wide are your tryes, i found that when i had real wide tyres (245s) they lasted quite a bit longer with higher psi, but with the 215s they rounded the edges a bit with lots of pressure... does anyone know why this is?

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Guest keltik

I run 40psi in mine. 215/40/17

Anything lower than 36psi feels sloppy, even with 40 psi the shoulders only just live as long as the center treads

I read in a couple semi reliable places that the max pressure of the tire - 15% is usually a good number

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 dubbedup']

[quote name='pl0x said:

i run 40ish pound in all my tyres, some people say to high but meh they seem to last...

/quote]

how wide are your tryes, i found that when i had real wide tyres (245s) they lasted quite a bit longer with higher psi, but with the 215s they rounded the edges a bit with lots of pressure... does anyone know why this is?

thats with pretty much any low pro tyres i have

with normal 13"'s i run 36psi

but wouldnt alot of pressure push the middle out more and stop the egdes from wearing unevenly?

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Set it up like a Drift car (lol i hear flaming) , so like i have mine on 32psi front, 38psi on the rear. (Inducing oversteer, reducing understeer), Wanting the front to be a bit more flatter to grab more surface, But to low psi and sidewall will flex..(unstable). Having lower psi in the rear than the front will more than likely induce understeer as the front will break traction before the rear.

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Set it up like a Drift car (lol i hear flaming) , so like i have mine on 32psi front, 38psi on the rear. (Inducing oversteer, reducing understeer), Wanting the front to be a bit more flatter to grab more surface, But to low psi and sidewall will flex..(unstable). Having lower psi in the rear than the front will more than likely induce understeer as the front will break traction before the rear.

I'm pretty sure that reducing front tire pressures and increasing rear tire pressures will induce major understeer especially in a subaru which already has tendency for understeer. Most of us want to reduce this so we have increased front tire pressure to improve turn-in sharpness and reduce the amount of understeer.

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 GC82GO said:

Set it up like a Drift car (lol i hear flaming) , so like i have mine on 32psi front, 38psi on the rear. (Inducing oversteer, reducing understeer), Wanting the front to be a bit more flatter to grab more surface, But to low psi and sidewall will flex..(unstable). Having lower psi in the rear than the front will more than likely induce understeer as the front will break traction before the rear.

Yea, try it the other way around. You'll find your cars to have much more of a tendency to oversteer with 38 F/ 32R compared to 32 F/38 R.

OP: If you are asking to find the best tyre pressures for performance I advise to experiment with the car and find somewhere where you can throw it around and find out how the varying pressures effect the cars tendency to over/understeer. Start by trying various pressures between 30-40psi F & R, etc..

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