Tyre Pressure

[J-Boy]

Hi guys...how many PSI would u pump into yer tyres on a ECR33 fer sizes from 225-255/40-45/17?

Edited September 30, 2005 by J-Boy

[Col-GTSX]

I have similar tyre sizes and i run 32psi....

I do have massive camber on the rear wheels so i do tend to let them down a bit 30-29 area to get a little more grip on the road....

Anything more than 32psi and i get wheel spin due to lack of contact...

[Col-GTSX]

Also on the black top i run 20psi in the rear... So i can get a good burnout and heaps of grip....

[blind_elk]

Hi guys...how many PSI would u pump into yer tyres on a ECR33 fer sizes from 225-255/40-45/17?

<{POST_SNAPBACK}>

What does the tyre manufcturer recommend?

I'm running 235/45x17 Bridgestone GIIIs at 36psi - because that's what B/S recommends.

[J-Boy]

I've no idea what the tyre manufacturer recommends....but it seems like a number of people have told me that they would put at least 34psi, to abt 36 or 38psi.

[Edge]

43 psi 225/50/r16 - but check the max pressure rating of the tyres you have - and actually this depends on the tyre. For example the Pirelli PZero Nero optimum recommended pressure by Pirelli upon phoning them is 39 psi for the 225/50/r16. I prefer 43 psi though.

[J-Boy]

43psi?? Isn't that a bit too much?

[d00dz]

43 psi 225/50/r16 - but check the max pressure rating of the tyres you have - and actually this depends on the tyre. For example the Pirelli  PZero Nero optimum recommended pressure by Pirelli upon phoning them is 39 psi for the 225/50/r16. I prefer 43 psi though.

<{POST_SNAPBACK}>

damm wtf.. 43PSI?

thats high man... hardly any grip. Drop them down to 34PSI or best would probably be 32PSI in dry and like 29-30PSI for rears in the wet.

[Links]

For most tyres people recommend 32psi.. 43psi is ALOT.. wonder why they recommend it, i'm sure there is a reason..

Yeah.. on average i've heard about 32 - 35 is a good balance on tyre wear + grip.. if you run them to high they don't wear evenly accross the tyre I believe..

[Busky2k]

You'd need a very good reason to run >40psi. The max psi rating on the sidewall is not an indication of the pressures you should run.

I would try with 34psi all round and tweak it from there based on your personal preference. I run 35 on the front, 36 on the rear (235 F, 255 R)

[Edge]

It was 39psi recommended for those wheels by Pirelli.

And I recall that the reason I put the pressure up was because the outside of the wheels was scrubbing really bad at high speed cornering with 34 psi. 39psi is ideal for normal driving. The reason I used 43psi was that during high speed cornering it stopped my tyres outside edge wearing out too much. The inside wore due to the negative camber. At the end of the day the 43psi puts a bit of extra pressure on the middle, so it wears a touch faster in the middle, and causes it to be 2mm further worn by the time it reaches the wires at the bottom of the tread.

That pressure was ideal to me. -1.2 camber was my setting for the above.

Just bought new 18"/9.5" and 18"/8.5" wheels and was recommended 40psi. Havn't confirmed recommended pressure with anyone yet though.

Front rims 18"/8.5" with Bridgestone Potenza RE-01 235/40/ZR18

Rear rims 18"/9.5" Yokahama ASpec dB 265/35/ZR18

lowered now and have -2.84 camber on the rear and have not rolled the guards.

[J-Boy]

u lowered the car till wot height and ended up having -2.84 camber on the rear? That is without adjusting the camber yet rite, as in -2.84 was the immediate value of camber after lowering?

[shanef]

Lowering and raising the car will throw out the wheel allignment, thus changing the camber, among with other things.

[J-Boy]

Yeah i know it will change the camber..just interested to know and wot ride height did it get lowered to and ended up with -2..84 camber on the rear...

[thommo]

i run 38psi cold all round

[BreathLess]

My mate a tyre fitter and he recomends no more than 32psi for any tyre.