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    lowering tire pressure for softer ride

    just got my new S with 20" wheels riding on steel springs. factory settings call for 44 rear and 38 in the front but the ride is just too harsh at that pressure. any suggestions as to what benefit there would be to lowering the pressure to 34-36 all the way around. also, since i have the tire pressure monitor, i've been told the pressure settings are set and unchangeable. is that the case? if so, any problem in turning off the monitor.
    thanks


    Re: lowering tire pressure for softer ride

    Birrclan,

    I would be VERY carefull playing around with tire pressure cuz your tires are the one & only connection to the street.

    In my opinion a Cayenne in connection with 20" wheels and low diameter tires is not the optimal choice cuz even with 18" wheel the suspension is very. On my last holiday trip I maxed my S a couple times out and by speeds over 210 kph I feel riding a horse than to drive a modern car :-) Near all last german magazines mentioned that the suspension is to hard.

    Maybe you go for the 19" wheels - it`s a good choice in my opinion cuz wheels are very attractive and the tire diameter is big enough.


    Re: lowering tire pressure for softer ride

    Quote:
    just got my new S with 20" wheels riding on steel springs. factory settings call for 44 rear and 38 in the front but the ride is just too harsh at that pressure. any suggestions as to what benefit there would be to lowering the pressure to 34-36 all the way around. also, since i have the tire pressure monitor, i've been told the pressure settings are set and unchangeable. is that the case? if so, any problem in turning off the monitor.
    thanks





    Sorry if I'm a little bit too harsh in my words but requests like that make me furious.
    The tires are one of the most important safety features of your car, if not THE most important.
    The manufacturer (especially Porsche) chooses tire pressures not only because of comfort or sportiness but also based on durability and safety. Messing around with your tire pressure is the best way to have the surprise of a rollover (it is still possible, even with PSM!) or a blown tire.

    Your ride is too harsh and stiff? Why did you buy a Cayenne?
    The Cayenne is well known to be the "sportscar" of SUVs.
    Now imagine you buy a Porsche 911 and you make complaints about ride stiffness, exhaust/engine noise and nervous high speed behaviour. Buy a different car, that simple.

    No offense taken but if just the brand name Porsche made you buy the Cayenne, it is the wrong car for you.
    Porsche also means "compromise", Porsche also means "passion". If it would be perfect, it would be boring. And you know what happens to boring relationships...

    So my advise for your own safety: DO NOT mess around with the tire pressure on the Cayenne. This is a 2.3 ton SUV whose tire pressure has been adapted to it's handling and safety features. Even mounting a tire not approved by Porsche can have a serious impact on safety.

    Do whatever you want with your Cayenne but keep your hands of the tire pressure. Remember the Ford Explorer Incidents? They happened because of low tire pressure, not because of bad tires. We have older Ford Explorers over here in Germany running with the same tires at speeds of 100 mph and more and there never has been a blown tire incident.
    Due to the Autobahn, we're very "educated" regarding tire pressures, there is not one week passing without the press or TV reminding people of the dangers of low tire pressure or damaging tires by climbing boardwalks, etc. . Whenever I'm in the US and I rent our favorite Lincoln Navigator, the tire pressure isn't even within factory specs for an empty car. I always ask them to raise tire pressure to maximum load specs (well, me, my wife, kid and luggage are maximum load...) and I always get suprised looks and a comment like "harsh drive", etc. I don't care, I know how important the tire pressure is and the safety of my family is more important to me than comfort rides. Sometimes I wonder why rental companies don't put more importance to tire pressure.

    But as I always said: it is your car, your life and your decision.

    Re: lowering tire pressure for softer ride

    I can't agree with RC more. I probably do not check my pressures as much as he, but I do before every long trip and before every canyon run. It's not only a safety issue, but it keeps the car handling well. Another point he brings up is not just stopping at the recommended pressure. You have to account for load on the car and the type of situations you might encounter. For example, I keep them slighty higher for performance driving.

     
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