Perth-WRX.com  

Go Back   Perth-WRX.com > Technical > Mechanicals
Register Diddy Kart ArticlesAll AlbumsBlogs FAQ Community Calendar Today's Posts Search


Welcome to Perth-WRX, click here to register!

Reply
 
LinkBack Thread Tools Display Modes
  #1  
Old 20-09-2008, 12:24 PM
DCCD Donut Driver
Member
 
Join Date: Jan 2008
Location: Perth
Posts: 122
Thanks: 0
Thanked 0 Times in 0 Posts
siaw at standard level
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
Reply With Quote
  #2  
Old 20-09-2008, 12:27 PM
SPEC IV's Avatar
Flat Four Father
Member
 
Join Date: May 2007
Location: Perth
Posts: 2,458
Thanks: 5
Thanked 0 Times in 0 Posts
SPEC IV at standard level
Default

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
__________________
....slow and steady wins the race....fark that!!
Reply With Quote
  #3  
Old 20-09-2008, 12:33 PM
Kato's Avatar
Burnout!
Member
 
Join Date: Jul 2005
Location: Pimp Corner
Posts: 7,079
Thanks: 7
Thanked 120 Times in 75 Posts
Kato is a guruKato is a guru
Default

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.
__________________
[COLOR="Gray"]550Nm off a 2L... Just wish it was in the dak dak...[/COLOR]
Reply With Quote
  #4  
Old 20-09-2008, 12:43 PM
DCCD Donut Driver
Member
 
Join Date: Jan 2008
Location: Perth
Posts: 122
Thanks: 0
Thanked 0 Times in 0 Posts
siaw at standard level
Default

Does front and back PSI need to be the same? Do we need extra at the front for the extra engine weight?
Reply With Quote
  #5  
Old 20-09-2008, 12:46 PM
Hurtenstein's Avatar
Subaru Tech Division
Member
 
Join Date: Mar 2006
Location: C to tha V
Posts: 1,747
Thanks: 0
Thanked 7 Times in 6 Posts
Hurtenstein at standard level
Default

if anything, less at the front is slightly better i find.
i run 35 front 40 rear.
__________________
Balls.
Reply With Quote
  #6  
Old 20-09-2008, 12:55 PM
Kato's Avatar
Burnout!
Member
 
Join Date: Jul 2005
Location: Pimp Corner
Posts: 7,079
Thanks: 7
Thanked 120 Times in 75 Posts
Kato is a guruKato is a guru
Default

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.
__________________
[COLOR="Gray"]550Nm off a 2L... Just wish it was in the dak dak...[/COLOR]
Reply With Quote
  #7  
Old 20-09-2008, 12:57 PM
DCCD Donut Driver
Member
 
Join Date: Jan 2008
Location: Perth
Posts: 122
Thanks: 0
Thanked 0 Times in 0 Posts
siaw at standard level
Default

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"
Reply With Quote
  #8  
Old 20-09-2008, 01:17 PM
redlib's Avatar
Subaru Tech Division
Member
 
Join Date: Sep 2007
Location: Perth
Posts: 1,263
Thanks: 3
Thanked 5 Times in 5 Posts
redlib at standard level
Default

If your running low profile tyres then they should be around the 38 psi mark if not then 32 all round.
Reply With Quote
  #9  
Old 20-09-2008, 02:04 PM
rexhunta's Avatar
Sir AntiLag
Member
 
Join Date: Sep 2007
Location: Australind, WA
Posts: 333
Thanks: 0
Thanked 0 Times in 0 Posts
rexhunta at standard level
Send a message via MSN to rexhunta
Default

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
Reply With Quote
  #10  
Old 20-09-2008, 02:42 PM
Taktics's Avatar
STI Master
Member
 
Join Date: Apr 2007
Location: Perth
Posts: 674
Thanks: 1
Thanked 0 Times in 0 Posts
Taktics at standard level
Default

Just went to the servo, 40psi all around on 16" RE001 for tomorrow at AHG.
__________________
STi Version VI
Reply With Quote
Reply

Tags
correct, pressure, tyre


Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On




Welcome to Perth-WRX, click here to register!

All times are GMT +8. The time now is 07:32 AM.


Powered by vBulletin® Version 3.8.9
Copyright ©2000 - 2024, vBulletin Solutions, Inc.
Content Relevant URLs by vBSEO