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Re: Lowering Tire Pressure in 19" Michelins to soften ride
You can, but then you screw up your handling and run a greater risk of damaging the rims. I wouldn't go lower than recommended. Personally I find the suspension soft with PASM and 19's. Any softer and it would be like driving a Buick.
Re: Lowering Tire Pressure in 19" Michelins to soften ride
Riding like a Buick sounds good compared to the ride I get with 19s on the regular Carrera. At least you have a choice in the S. That's the one mistake I made in ordering. I like the regular Carrera fine in every respect except for the ride. I should have either ordered PASM along with the 19s (then I might as well have bought the S) or just stuck with the stock 18s.
Re: Lowering Tire Pressure in 19" Michelins to soften ride
Quote:
chipper said:
The Porsche Manual says 34 psi front/ 40 psi back, I believe.
As I discovered today, my manual's recommendation for "partial load" is 33/39 f/r. My 997S came with Pirelli P-Zeros and the sticker on the door post has numbers vastly different from the manual's. Dealer said follow what's on the door post, not the manual, that different brand tires require different inflation pressures.
Re: Lowering Tire Pressure in 19" Michelins to soften ride
The P-Zeros, I've heard, are a quieter better riding tire than the Michelin Pilots. I've always had Pirellis on my earlier Porsches. This is the first one with Pilots. Actually I prefer the P-zeros. The Michelins are loud on the road.
Re: Lowering Tire Pressure in 19" Michelins to soften ride
Quote:
ArthurY said:
My 997S came with Pirelli P-Zeros and the sticker on the door post has numbers vastly different from the manual's. Dealer said follow what's on the door post, not the manual, that different brand tires require different inflation pressures.
First time I heard that and, frankly, I have my doubts about the reliability of your dealer's information. After all, the same sticker would stay on the car after a tire change, which could also involve a change of tire brand.
What are the pressures quoted on the sticker in your case?
Re: Lowering Tire Pressure in 19" Michelins to soften ride
Quote:
Revvv said:
Never, ever run tire pressures less than the ones posted
in your door jam. If you want a smoother ride, and you have standard suspension ; you probably chose the wrong car....
Revvv
VERY WELL said. The tire pressures recommended by Porsche are the minimum recommended tire pressures, going below them for street driving may damage the tire sooner or later and I'm talking about invisible damage which could result in dangerous situations.
For track racing, I highly recommend getting a second set of tires and rims. Lowering the tire pressure makes somehow sense for track racing but ONLY if you warm them up sufficiently before you seriously race them. The reason for lowering the tire pressure on the track? Well, simple: if you lower the pressure by 0.2-0.3 bar before you start racing, after some fast rounds, the tire pressure rises back to the recommended values. But this ONLY is recommended for track racing, including some cautious warm-up rounds and of course raising the tire pressure again back to normal when finishing track racing.
So whoever complaints about the 997's harsh ride, definetely bought the wrong car, sorry to say that.
And forget about what the dealer tells you: ALL Porsche recommended brands which are approved for the 997 have the SAME tire pressure in the same size, there is no pressure difference by tire brand, this is pure crap. Greeting to your dealer, he should be careful what he tells his customers. And I honestly doubt that the manual says something else than the sticker on the door. In my experience, most people don't even read the manual, did you?
Re: Lowering Tire Pressure in 19" Michelins to soften ride
Have to agree, in my S I find the ride fine for day to day in normal mode. Hit sport mode on PASM and its a whole different ride on the street. Actually, cant really think of a comparable sports car which rides as well in normal mode.
Re: Lowering Tire Pressure in 19" Michelins to soften ride
You may want to contact Wheel Enhancement (link). They take Porsche factory wheels in for trade and they have just about every Porsche wheel in stock. You may want to trade down to a set of 18s. And you can have the 18s delivered with Pirellis already mounted and balanced. Good luck.
Re: Carrera Ride with 19s
I may be wrong about this, but my sense is that Porsche developed PASM in order to run 19' wheels on the Carrera S and maintain a comfortable ride for everyday street use. The S ride in normal mode is "softer" than the ride in the std. Carrera (according to PCA PANO mag.). 19s and PASM, in other words, go together.
The problem starts when 19s are mounted on the reg. Carrera without PASM. The ride may be fine for the track, and fine on very smooth, well surfaced roads, but on rough roads it makes the hardest ride of any of the 8 Porsches I have owned. That includes several generations of 911s and two Boxsters.
The problem starts when 19s are mounted on the reg. Carrera without PASM. The ride may be fine for the track, and fine on very smooth, well surfaced roads, but on rough roads it makes the hardest ride of any of the 8 Porsches I have owned. That includes several generations of 911s and two Boxsters.
Re: Lowering Tire Pressure in 19" Michelins to soften ride
Quote:
RC said:
The tire pressures recommended by Porsche are the minimum recommended tire pressures, going below them for street driving may damage the tire sooner or later....
And forget about what the dealer tells you: ALL Porsche recommended brands which are approved for the 997 have the SAME tire pressure in the same size, there is no pressure difference by tire brand, this is pure crap. Greeting to your dealer, he should be careful what he tells his customers. And I honestly doubt that the manual says something else than the sticker on the door. In my experience, most people don't even read the manual, did you?
Well RC, in fact I did read the manual.
My manual (version WKD 997 021 06 printed 5/05) says twice (page 5, again on page 290) that for the Carrera S 19-inch wheels, with a "partial" load of UP TO two person with NO luggage (which how I drive 99% of the time), pressure is 33 psi front, 39 psi rear.
On the driver's door jam of my 2006 997S there are two Tire Loading stickers. The larger one, exactly the same as "Tire Pressure Plate A" at the manual's page 233, states that the f/r psi should be 37 and 44. A second, smaller yellow sticker, which is adjacent to "Tire Pressure Plate A," states in pertinent part that for partially loaded cars the psi in the owner's manual may be safely used.
Safety? Comfort? You're the one with ties the the factory cognoscenti; you tell us.
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