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Old 06-14-2005, 02:17 PM   #1
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Exclamation Tyre Pressure on a boxster

I need to know the accurate tyre pressure for boxster 2.5 MY99, manual transmission. 225/40ZR18 and 265/35 ZR18 Pirelli Pzero Rosso N4.

Now I put 2.0bar front and 2.5 rear, but I am not sure because car left the road in a curve and rear center tyres is consumed, however edges are brand-new. (overpressure?)

A web by delticom holds correct pressures are 2.0bar front and rear for boxster 2.5 wheel 18".

I would estimate all your help.



Regards.


Last edited by valcax; 06-14-2005 at 02:23 PM.
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Old 06-14-2005, 03:59 PM   #2
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Not exactly sure....

what your tire pressure should be, but I have the 17" Pirelli PZeros, 50/205 up front, and 40/255 in the rear, the recommended pressure on these are 36 psi on the rear, and 29 upfront.....This seems to work well with mine...Yours are probably a few psi higher front and rear.....

When I first purchased the car, the back tires were about 10 psi low ......and the outside of the tires are worn a bit more than the center/inside, given the camber on the rears.....So it makes sense that if your center is worn, but your outsides are OK, you may very well be overinflated.....

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Old 06-15-2005, 12:05 AM   #3
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then, which pressures (in bar) are accurate?
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Old 06-15-2005, 04:58 AM   #4
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mathematically,
36 psi = 2.48 bars
29 psi = 1.99 bars
so 2.5 bars (rear) and 2.0 bars (front) match the manufacturer's recommendations.

My local tire shop has suggested running a little higher pressure in the fronts for sharper turn in, I use about 32-33 psi(2.25 bar).
But I'm fairly new to the car.
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Old 06-15-2005, 03:14 PM   #5
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thanks!!!!
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Old 06-15-2005, 08:21 PM   #6
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Limon is right. The Porsche recammendation is a tad low for the fronts for safety(I guess to induce understeer instead of oversteer if you overcook a corner) I run 33/36 Front/rear

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