Whats everyone running? I've looked at the 'tyre pressures - getting them right' post, but with different load ratings front and rear, and assuming a 52/48 front/rear weight distribution, i get to 33psi in the front, and 29psi in the rear... Thats on 225/40/18 and 255/35/18 tyres.

 

Does this sound about right? whats everyone else running at? Looking forward to a glorious 200mile round trip at xmas :D, and wanna make sure they're right before I set off.

 

Cheers!

I have similar tyre sizes to you - except for 265/35/18 on the back - and I run with about 32-33 front and 35-36 psi on the rear.

 

With non-standard wheels/tyres it's all trial and error really to see what works and feels best. I'd say that 29 on your rears is a bit too low - especially if you're planning a long high speed journey. Too low a pressure makes the tyres flex and heat up more; which could cause a blow-out at high speed....

 

Richard:cool3:

ive always run a slightly higher pressure on the front to make the steering cut into the corner more (set up for fast road/circuit).

 

my tyre sizes are, 245, 35, 18 at 32psi F

285, 30, 18 at 30psi R

 

combined with suspension & geo mods and deletion of the rear ARB, she's like running on rails :D

combined with suspension & geo mods and deletion of the rear ARB, she's like running on rails :D

 

Hmmmm, interesting. More details please.

Should be same as standard pressure what ever wheel and tyre size your running! UK Spec is 33psi front at 36 rear according to the standard Nissan sticker stuck underneath the compartment behind the hand brake.

Hmmmm, interesting. More details please.

 

it will only work with stiff coilovers and correct geo settings. if you remove the rear ARB then the arse end will naturally "roll" into a corner allowing more grip on the rear and producing under steer which can be easly controlled with a little throttle through the bend. it's not to everyones taste and behaves so differently to how a rear wheel drive car should but, once mastered, can get you round a track pretty quick!

 

so, in affect, the rear coilovers are taking over the job of the ARB but, are allowing each rear wheel to work inderpendantly.

 

the whole car must be setup correctly i.e. camber, caster, toe and corner weighted for it to perform correctly.

 

caution... you can't just disable the roll bar on a stock setup, or you'll have no control or the rear end at all.

it will only work with stiff coilovers and correct geo settings. if you remove the rear ARB then the arse end will naturally "roll" into a corner allowing more grip on the rear and producing under steer which can be easly controlled with a little throttle through the bend. it's not to everyones taste and behaves so differently to how a rear wheel drive car should but, once mastered, can get you round a track pretty quick!

 

so, in affect, the rear coilovers are taking over the job of the ARB but, are allowing each rear wheel to work inderpendantly.

 

the whole car must be setup correctly i.e. camber, caster, toe and corner weighted for it to perform correctly.

 

caution... you can't just disable the roll bar on a stock setup, or you'll have no control or the rear end at all.

 

Thanks for that. Was interested to know how it would work. :smartass:

I run 34 front and 36 rear as Nissan state. I didn't think the pressure should change even if you are running larger wheels low pro tyres etc?

Should be same as standard pressure what ever wheel and tyre size your running!

 

That's a common misconception.

 

What's written on the car/in the manual/handbook only applies to the tyres that Nissan originally recommended/fitted at the time the car was first purchased. Anything else should be deferred to the actual Tyre Manufacturer's guidelines (although, admittedly they are often the same as the Nissan guidelines). Definitely worth checking.

 

This comes from the Bridgestone UK Technical Director, who I met a few weeks ago.

thats why im thinking using the load rating for a best guide - entirely possible that the standard tyres nissan fitted 20 years ago would not have been rated to such high pressures, and probably with flimsy sidewalls.

 

although general consensus is to have higher pressures in the rear? this would seemly conflict with the slight front heavy nature of the car?

I've always ran 32 up front and 34 rear but I've not really thought about optimising the pressure