Tire PSI levels
11-02-07, 06:20 AM
#18
Pole Position
Join Date: Jan 2004
Location: Ontario, Canada
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I have stock 18's and just use the OEM suggested tire pressure that's in the label on the driver side door frame. It actually has 3 sets of figures 1) OEM 17's, 2) OEM 18's 3) Donut Spare
I have Front 35 PSI and Rear 37 PSI per OEM specs. I check it every second week and usually the tire loses 1 PSI over 2-3 weeks (I drive about 400+km per week on highway speeds).
I take the cold tire pressure prior to driving and then figure out how much each tire needs, then drive to the gas station and measure the PSI again (usually the heated tires would now read 1 PSI higher) and then just add the amount that i measured for each tire prior to driving. E.g. If the OEM PSI is 35 and I measured 33 prior to driving, I'll need to add 2PSI. Once at the gas station I measure again and the PSI is now 34, so I'll just add 2 PSI. When the tire is cooled again it will read 35 PSI.
btw. I never trust tire gauges from the air pump, I carry a digital one in my glovebox. Also, if you took your cold tire temp inside a garage during winter time you might need to add an extra PSI for every 10 degrees C drop in outside temperature.
I have Front 35 PSI and Rear 37 PSI per OEM specs. I check it every second week and usually the tire loses 1 PSI over 2-3 weeks (I drive about 400+km per week on highway speeds).
I take the cold tire pressure prior to driving and then figure out how much each tire needs, then drive to the gas station and measure the PSI again (usually the heated tires would now read 1 PSI higher) and then just add the amount that i measured for each tire prior to driving. E.g. If the OEM PSI is 35 and I measured 33 prior to driving, I'll need to add 2PSI. Once at the gas station I measure again and the PSI is now 34, so I'll just add 2 PSI. When the tire is cooled again it will read 35 PSI.
btw. I never trust tire gauges from the air pump, I carry a digital one in my glovebox. Also, if you took your cold tire temp inside a garage during winter time you might need to add an extra PSI for every 10 degrees C drop in outside temperature.
11-02-07, 07:22 AM
#19
Lexus Test Driver
I just put a set of 19's on my IS250 AWD, and noticed the car was very sensitive to tire pressure.
I do agree .
If you under inflate the backs, the car does seem a bit soft, but, if you over inflate the fronts by 2 or 3 psi, and leave the backs at the recomended settings, the car was pretty sharp.
It's been pretty cool weather wise so depending on where your at you may want to consider this also.
I do agree .
If you under inflate the backs, the car does seem a bit soft, but, if you over inflate the fronts by 2 or 3 psi, and leave the backs at the recomended settings, the car was pretty sharp.
It's been pretty cool weather wise so depending on where your at you may want to consider this also.
11-02-07, 07:58 AM
#20
Lead Lap
Join Date: Mar 2007
Location: Saudi Arabia
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i say just stick with what that sticker says.mine say's 35 for front and 38 for rear(17"),dunno if the car's different engine will make the levels different than the 250 or 350 with 17".
btw,i received a gauge with the car (the one that looks like an aluminum stick).
btw,i received a gauge with the car (the one that looks like an aluminum stick).
11-03-07, 08:08 AM
#21
Super Moderator
I take the cold tire pressure prior to driving and then figure out how much each tire needs, then drive to the gas station and measure the PSI again (usually the heated tires would now read 1 PSI higher) and then just add the amount that i measured for each tire prior to driving.
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