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    Steering wheels over 150km/h

    Dear all,
    do you find your steering become "lighter" when you are driving at 150km/h? The reason I ask becuase I just change the "Super Light" Sport Techni Wheels to replace the orginal S wheels, and I found the steering wheels feels "lighter" when I drive fast.

    Re: Steering wheels over 150km/h

    I am not sure, but it is possible to be a physic thing "Lift".

    Re: Steering wheels over 150km/h

    JL13 is correct. At those speeds, lift definitely becomes evident in the feel of the 911 front end. It's ok - you're totally stable - you just need to get used to it gradually.

    Re: Steering wheels over 150km/h

    Quote:
    Sun Gor said:
    Dear all,
    do you find your steering become "lighter" when you are driving at 150km/h? The reason I ask becuase I just change the "Super Light" Sport Techni Wheels to replace the orginal S wheels, and I found the steering wheels feels "lighter" when I drive fast.



    When you changed wheels, did you also fit brand new tires?

    New tires have less grip for a couple of hundred kilometers, and if your observation was arrived at at this stage, then the lightness might be a result of the reduced "feel" of new tires.

    Re: Steering wheels over 150km/h

    Lighter wheel-tires combos also will give less gyroscopic stabilizing effect at speed as well.

    Re: Steering wheels over 150km/h

    Quote:
    Grant said:
    Lighter wheel-tires combos also will give less gyroscopic stabilizing effect at speed as well.


    Could u kindly please explain further what this means?

    Re: Steering wheels over 150km/h

    Quote:
    Avantgarde said:
    Quote:
    Grant said:
    Lighter wheel-tires combos also will give less gyroscopic stabilizing effect at speed as well.


    Could u kindly please explain further what this means?


    Any spinning mass creates a gyroscope that resists being turned on any axis other than the one on which it's spinning. For instance, a bicyle or motorcycle is very stable at high speed (doesn't require alot of balance), since its front wheel resists being steered left or right while it's spinning quickly (it's much easier to turn the handlebars when you're parked or going slowly) and it also resists being leaned over, preferring to remain upright. Car wheels provide the same effect. They resist steering and prefer to track straight ahead while at high speed. When you lighten the mass (or decrease its diameter), the effect is lessened.

    Re: Steering wheels over 150km/h

    Thansk guys, is that mean is not really a good choice to replace a lighter wheels for this car?

    Re: Steering wheels over 150km/h

    Quote:
    Sun Gor said:
    Thansk guys, is that mean is not really a good choice to replace a lighter wheels for this car?



    no, no, the lighter the wheels better, less unsprung weight and better handling. The only thing is that you "may" notice a lighter steer from the gyroscopic effect that Grant just explained. However if the lighter steering you feel is from this, then this is not a bad thing, its just a "false sense" of insecurity as a consecuence of easier turn in. Just like a mid-engine car vs a front engine car and their polar moment of inertias, the mid-engine may feel more nervous, less stable when in reality this is a good thing. This is very noticeable in sportbikes in the turn in, the lighter wheels better, quicker turn in into the curves.

    So its like when driving a 2 ton sedan you get the "impression" the car feels more stable at speed than in a sportcar. Its a false sense of security that the sheer mass and inertia of the heavy sedan is giving you in a straight line since the car is less inclined to change direction, but in reality the car is more dangerous at speed and worse handling.

    But it is still to be determined if the lighter wheels are causing that sensation, it could be very well just the new tires like Fritz mentioned.

    Also check the tire presures, becuase they may have changed in the wheel change. Make sure the front tires are not above normal, this may give a sense of lighter steering.

    Also make sure the new wheels are exactly the same size, if the front wheels create a smaller contact patch this will lead to lighter steering.

    Re: Steering wheels over 150km/h

    Yes, I agree with Carlos. Lower weight wheels and tires make the driving dynamics much better in general (starting, stopping, turning).

    Re: Steering wheels over 150km/h

    Really thanks Carlos, Actually I am using the old tires and the size of the new wheels are exactly the same as the old one. However, I will check the tire pressure today and ask the guy to re-balance the wheels for me.

     
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