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    Mar 30, 2005 1:00:13 AM

    ArthurY
    Co-Pilot
    ArthurY
    Loc: Los Angeles, CA
    Posts: 153, Gallery
    Registered on: May 26, 2004

    Changing Stock Tires

    "Wheels and tires are often the first things that get changed on a modified car. Funny thing is, no one's really thought about what changing them does. Sure there's endless speculation about rotational inertia, fuel economy and ride quality--blah blah blah. As far as we know, no one's even posted basic performance numbers for a car with new wheels and rubber. So we decided to find our favorite European car, test it, slap on some plus-one high-end wheels and tires and test it again...."
    http://europeancarweb.com/tech/0505ec_996tt/

    Mar 30, 2005 9:15:47 AM

    Carlos from SpainM
    Rennteam Moderator
    Carlos from Spain
    Loc: Spain. , Spain
    Posts: 20826, Gallery
    Registered on: Feb 9, 2003
    Reply to: ArthurY

    Re: Changing Stock Tires

    Great article Arthur, thanks!

    It just goes on to enforce upon what it has been said about messing with stock tire/wheel sizes.



    "The slalom yielded similar confusion. Where the stock Turbo blitzed through the cones with predictable precision, the larger wheel and tire package caused it to handle with dangerous unpredictability, sometimes in oversteer, sometimes in understeer... I consulted Michelin and Porsche engineers along with some seasoned Porsche racers about this. Porsche's engineers did not find our problem surprising and said, "All the fuel and chassis control systems on the 996 Turbo are built and tested around the wheel and tire size and their corresponding rolling radius. Altering the standard size not only has adverse effects on the performance and handling but most likely could end in damaged drivetrain parts such as a broken front differential or viscous clutch damage (not a warranty matter). The weight of the wheels and tires is not a major factor." This just goes to show how dialed in Porsche's cars are out of the box."

    Mar 30, 2005 4:03:40 PM

    iia
    Pilot
    iia
    Loc: Canada
    Posts: 342, Gallery
    Registered on: Aug 24, 2004
    Reply to: Carlos from SpainM

    Re: Changing Stock Tires

    especailly 4WD as it is more sensitive to tires size changes.

    Mar 30, 2005 7:20:50 PM

    BD 997
    Veteran
    BD 997
    Loc: Boston, MA USA
    Posts: 833, Gallery
    Registered on: Feb 16, 2005
    Reply to: iia

    Re: Changing Stock Tires

    i agree
     
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