Tire inflation PSI on Type "S" a-spec

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Old 10-29-2007, 03:32 PM
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Tire inflation PSI on Type "S" a-spec

Hey guys,


one of the infaltion sensors on my TL Type "S" is reading low, always kept the tires at 32 psi but when i looked at the sticker in the door jam i saw this:

Tire size: 235/40 R18

cold PSI

260 kPa 38 PSI
240 kPa 35 PSI

what's the "kPa"stand for? which one do i need? 38 or 35?

Why did the car come from the dealer with 32 PSI?

Thanks!!!
Old 10-29-2007, 03:48 PM
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On my 2005 Tl A-spec.....exact same 18"rims....it recommends 39psi front and 36psi rear. I keep mine to that spec and fill with nitrogen. Disregard the kilopascal units unless your in Britan.....its like reading kmph and mph, same thing diff units of measure.
Old 10-29-2007, 05:48 PM
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kPa= kilo Pascal. It's a measure of pressure, just like psi.

Your dealer's PDI guy didn't check the tire pressure before delivery. That's why they're low.

Looking at the numbers, your front ones should be 38 psi and the rear ones 35.
Old 01-29-2010, 01:00 AM
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correct tire pressure for 18" a-spec wheels

The Right COLD PRESSURE for 235/40-18 tires on a 3G TL

2004 39 psi front / 36 psi rear
2005 35 psi front / 32 psi rear
2006 35 psi front / 32 psi rear
2007 38 psi front / 35 psi rear
2008 38 psi front / 35 psi rear

This is valid for any 18 inch wheels with 235/40-18 tires on a TL. Type-S or Not it doesn't matter, the pressure is determined by car weight that's why the same tire needs different pressure in different years of the TL.

You need to check your tires BEFORE driving One Mile

check them at least every week, the pressure varies with the temperature.

I have used Nitrogen and Air in different tires at the same time in my car and looking very closely to the TPMS readings, they're actually very alike, temperature rises, pressure rises. But if Formula1 fill it's tires with N then there must be something.
Old 01-29-2010, 09:03 AM
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Originally Posted by luiscon14
....This is valid for any 18 inch wheels with 235/40-18 tires on a TL....
Tire load rating must also match the OEM load rating for this to be a totally correct statement. As long as the tire meets the OEM size AND load factor, the OEM placarded pressures will apply.
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