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YOUR RESEARCHAir pressure - 986 Forum - The Community for Porsche Boxster & Cayman Owners
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Use on the carerra
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The size you posted are from the wheels used on the Carerra.
Air pressure - 986 Forum - The Community for Porsche Boxster & Cayman Owners
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Leading evidence: 'Use on the carerra' (no explicit attributable resolution; this is a reported action or suggestion). Across 1 matching discussions, The most frequently discussed action is 'Recommend 29/36' (1 discussions). For that action, 0 discussions report a resolution and 0 report an unsuccessful attempt. No action has an explicit, attributable resolution report under the current rules. These are forum reports and suggestions, not a confirmed diagnosis.
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I have settled on the recommend 29/36 on my 18" staggered.
Air pressure - 986 Forum - The Community for Porsche Boxster & Cayman Owners
Recommend inflation is
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the vehicle's manufacturer's recommended inflation is to provide you with the optimal straight line braking for the car, lessening the potential for a collision.
Air pressure - 986 Forum - The Community for Porsche Boxster & Cayman Owners
Recommend inflation is
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Suggestion
the vehicle's manufacturer's recommended inflation is to provide you with the optimal straight line braking for the car, lessening the potential for a collision.
Air pressure - 986 Forum - The Community for Porsche Boxster & Cayman Owners
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I have an 01 S model with the 18" staggered wheel option. My question is what do you guys do for air pressure? I know the plaque says 29 front and 36 rear but with the extra load tires that are so common in these sizes that still feels like a lot. There is ZERO sidewall bulge at that pressure and the front end feels nervous. Has anybody experimented with lower pressures? Thanks
If anything, I put in a couple pounds more. I think with less you are going to see uneven wear from the sides and middle. My wheel man says a little extra helps keep from bending a rim on the many potholes we seem to have also. Not much rubber there for cushion.
I like the numbers posted here. I go a little higher for daily driving as well. AX and Track days, whole different story!! I assume you ARE talking street driving, not racing pressures...
I have tried up and down, winter time summer time
I have settled on the recommend 29/36 on my 18" staggered.
Tires wearing evenly
+ psi harsher ride
- psi a bit squirmy
It's my personal policy to never have less than 30 psi in any tire on any vehicle.
Therefore I do 30 and 36.
This said, there really is little reason to doubt the Porsche recommendation.
Well, I know the rears are 18x10, and although I'm pretty sure the fronts are 18x8, I'm not near the car to check, and I'm not positive. 225/18 F and 265/18 R tires (I remember that much). They're the 996 Carrera 5-spokes, optional on the 2003 Boxster S.
Did your car come with those wheels or did you buy them and install them? For the Boxster the Carerra Light wheels are Fronts 18 x 7.5 Rears are 18 x 9. The size you posted are from the wheels used on the Carerra.
ah - that is what I was looking for. So 18" wheels on a Boxster as a factory option was 7.5" wide in front and 9" wide in back...great!
I'm trying to figure out if my wheels on my 2000 S are stock or not!!
The stock tire pressures were defined to ensure that the car has understeer and not oversteer. This is also the reason for the staggered tire widths (narrow in front, wider in rear).
Thus, generally the goal of tire pressure changes to a stock Boxster is to decrease the amount of understeer inherent in the design. To achieve this, slightly increase the front pressure and decrease the rear pressure. 31 front and 33 rear is a good starting point.
the vehicle's manufacturer's recommended inflation is to provide you with the optimal straight line braking for the car, lessening the potential for a collision. of course when you are looking for other optimal characteristics the pressures will vary, but the short line braking is the factor which incurs the highest amount of liability to the manufacturer.
