Bill Gregory

Having just mounted new S03's, I wanted to ask if anyone has adjustments to the Porsche recommended 36 psi front and 44 psi rear. Seems a bit high to me, but then I've been used to 29/34 stock pressures on the lighter SC.

Drew_K

I think those pressures are for high speed running on the autobahn. On my old 16's, I ran 36/40 b/c my commute is mostly at highway speeds. At those pressures, the handling seemed fine and the tire wear was even. Before that, I ran them at 34/38 and that also seemed fine.

Drew
92 C2

MelissaM

Hey, Bill,

Aside from the tire pressures, how are you liking the S-03's? I'm pretty happy with mine, but unfortunately haven't been able to drive my Porsche too much lately.

As far as tire pressures go, I think Todd Serota (see the Tracquest DE board or Rennlist email archives) recommends 32/34 on the 16's.

By the way, the 36/44 is recommended by Porsche for 16's, but 37 all around for 17's. Interesting, isn't it?

Take care.

-- Melissa

Bill Gregory

Melissa,

I just got the S03's on yesterday, so have perhaps a whomping 30 miles on them. After another 100 or so I'll start to seriously test 'em out. One thing I don't miss are the tires that came on the C2. Ugh. Out of balance and worn. If the RS suspension parts get here soon (should find out today or tomorrow what the schedule is for the parts from Porsche Germany), then I can do one alignment/corner balance instead of an alignment, followed by a later alignment/corner balance after the suspension is installed.

Jim Michaels

Bill: I might run with a deviant crowd, but I don't know anyone around here (Frog Level, VA) who still runs those infated tire pressures in the owner's manual. I think Todd's recommendation that Melissa mentioned above is much closer. Like Melissa, I also wonder why Porsche would recommend such high rear pressure, and also such a wide front-to-rear gap. They still must want us to drive with understeer galore.

Jay H

Bill:

I run my C2's tires at about 4-6 psi less than what Porsche recommends. 30-32 front and 38-40 rear. I haven't noticed any negative effects.

I just can't see running the rears at 44 psi which is max inflation for the tire itself. Doesn't seem to allow much for temperature variations (at least in my area where it can be 50 degrees in the morning and 20-25 degrees or more warmer by mid day) which affects tire pressure by 1 psi for each 10 degrees.

Jay

Bill Gregory

Drew, Melissa, Jim, and Jay - thanks for the replies. I'll try 34/38 for the time being, and see how it goes.