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  #1  
Old 20-09-2008, 12:24 PM
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Default What is the correct tyre pressure?

I had search the forum, cant find anything close. What I have - PIRELLI DRAGON 225/45/17 Rated at 91W. Factory pressure when fitted is 38psi front and back. The sticker beside the door is 33psi Front and 28 Psi Back Light Load. Who should I trust? By the way what is the 91W rating? Higher the better? Thanks in advance
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Old 20-09-2008, 12:27 PM
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91 = load rating W= Speed rating W is roughly rated at 270/kmph

If you want to learn more about the load ratings etc... read here
http://www.lets-getaway.com/tyre-markings.htm
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Old 20-09-2008, 12:33 PM
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38 is quite hard for daily driving. If going for a run out on the track, 38-40 would stiffen them up a lot.

Daily... whatever your preference is, usually around the 32 mark is a good balance between comfort and stiffness.
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Old 20-09-2008, 12:43 PM
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Does front and back PSI need to be the same? Do we need extra at the front for the extra engine weight?
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Old 20-09-2008, 12:46 PM
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if anything, less at the front is slightly better i find.
i run 35 front 40 rear.
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Old 20-09-2008, 12:55 PM
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From my playing around if I run less at the rear, it gets the back end to be a bit looser.

Normally I have them equal all around for daily though. The tyre placard in the car is just the minimum for a decent ride. Play around until you find the setting that suits you and your driving style.
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Old 20-09-2008, 12:57 PM
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Quote:
Originally Posted by Hurtenstein
if anything, less at the front is slightly better i find.
i run 35 front 40 rear.

Hmm, I haven't encounter the rear the higher than the front. I was told the front the heavier thus higher psi. But when the rear is higher and front is lower...I think I can imagine you have a high "arse"
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Old 20-09-2008, 01:17 PM
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If your running low profile tyres then they should be around the 38 psi mark if not then 32 all round.
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Old 20-09-2008, 02:04 PM
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When we smash new tyres on, 32 minimum. On something low profile, i always tend to bump up 34-35ish.

4wds need 36 when normal driving.

Don't play with track pressures anymore, but when i used to run the s13 down at collie it'd be 35 front 42 rear. But for everyday be 32.

On my 215/45/17s standard wrx rims i run 34 just push the middles out a bit more for a more evenish wear.

Pete
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Old 20-09-2008, 02:42 PM
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Just went to the servo, 40psi all around on 16" RE001 for tomorrow at AHG.
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