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Measuring tire pressure properly

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Old Oct 5, 2009 | 09:28 AM
  #16  
chin0's Avatar
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good info for the not-knowings haha
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Old Oct 5, 2009 | 09:48 AM
  #17  
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Originally Posted by jve153
ok, dumb question of the day... does anyone know the reason for keeping the 3 psi difference between front and rear other than "that's what the manual says?"
I'm not sure, but perhaps it's because there's a little bit more weight resting on the front end? However, depending on what you use you car for, you can adjust it, as there are some guys who go to the track with their rears having more air.
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Old Oct 5, 2009 | 10:39 AM
  #18  
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Originally Posted by jve153
ok, dumb question of the day... does anyone know the reason for keeping the 3 psi difference between front and rear other than "that's what the manual says?"
Because it's the factory let-s-make-sure-we've-got-plenty-of-understeer-setting. I run even pressure all around on the street and generally less pressure (as measured cold) in the front vs. rear on the track.

l8r)
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Old Oct 5, 2009 | 07:24 PM
  #19  
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i've been told by an Evo suspension guru to keep tire pressure to 33/35 front/rear COLD. (yes, meaning it will be ~35/37 when heated up).

this will help eliminate understeer a bit and increase tread life. at the same time, it's not too overinflated.
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Old Oct 5, 2009 | 08:17 PM
  #20  
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^ Is that recommended with a specific setup?
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Old Oct 5, 2009 | 10:05 PM
  #21  
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no. i'd say it applies unless ur suspension is tuned to be very tail happy.
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Old Oct 6, 2009 | 05:38 PM
  #22  
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do you guys check your tire pressures in any other cars as often as you are talking about on the evo? most tires hold air if they do not have a hole in them.
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Old Oct 6, 2009 | 05:45 PM
  #23  
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I make a habit of checking the tire pressure at each fill up, or sooner if it feels uneven. But despite checking them at each fill up, I usually don't need to add any air, but I do it anyway.
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Old Oct 6, 2009 | 05:57 PM
  #24  
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Originally Posted by Thoe99
That explains it. Another question...
If factory specs are 32/29psi, what pressures would you recommend for a 1000mile non-stop roadtrip?
With an Evo 8 with the stock suspension 32/29 is about all the air pressure you want, especially if you live in a town like mine, full of uneven concrete and RR tracks. On the highway the stock suspension comes into its own and will provide a comfortable ride with more air pressure. I usually go up about 3 psi front and rear when doing a road trip.

Speaking of tire pressure, when was the last time you checked the spare. Mine loses air rather quickly.
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Old Oct 6, 2009 | 06:03 PM
  #25  
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Originally Posted by jve153
ok, dumb question of the day... does anyone know the reason for keeping the 3 psi difference between front and rear other than "that's what the manual says?"
Recommended tire pressures for my '92 DSM = 32/29. Recommended tire pressures for my '04 WRX = 32/29. So, I'm thinking it is a Japanese thing. The chassis could be engineered so that the same pressure is needed in all four tires. So, maybe, in Japanese cars, 32/29 are the pressures that customers are used to.
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Old Oct 7, 2009 | 01:01 PM
  #26  
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so for 18 x 9.5 recommended tire pressure should be 32/38 or what i heard 36/39
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Old Oct 7, 2009 | 01:15 PM
  #27  
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Originally Posted by barneyb
Recommended tire pressures for my '92 DSM = 32/29. Recommended tire pressures for my '04 WRX = 32/29. So, I'm thinking it is a Japanese thing. The chassis could be engineered so that the same pressure is needed in all four tires. So, maybe, in Japanese cars, 32/29 are the pressures that customers are used to.
nope. 350z = 35/35
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Old Oct 7, 2009 | 05:25 PM
  #28  
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Originally Posted by evo9onmymind
nope. 350z = 35/35
Well, my survey was kinda small.
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