Tyre pressure advice - I've got 225/40 R18's on 18" Avus wheels....
07-13-2006, 04:23 PM
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Actually you have it wrong, remember all the parts work together
Increasing rear tire pressure in a already understeering car makes it understeer more. What you are doing makes a normal S4 handle worse. Your car has a stiffer rear sway bar which increases oversteer, reduces understeer. You have to look at the whole picture, see the chart below.
----------------------Increase----------Increase --------------------Understeer----------Oversteer
Front Tire Press-------Lower---------------Higher
Rear Tire Press-------Higher--------------Lower
Front Tire Width-------Smaller-------------Larger
Rear Tire Width-------Larger-------------Smaller
Front Camber---------More Positive--More Negative
Rear Camber------More Negative-----More Positive
Front Springs----------Stiffer-------------Softer
Rear Springs-----------Softer------------Stiffer
Front Anti-Sway Bar-----Stiffer------------Softer
Rear Anti-Sway Bar----Softer-------------Stiffer
Toe In-----------------Increase----------Decrease
----------------------Increase----------Increase --------------------Understeer----------Oversteer
Front Tire Press-------Lower---------------Higher
Rear Tire Press-------Higher--------------Lower
Front Tire Width-------Smaller-------------Larger
Rear Tire Width-------Larger-------------Smaller
Front Camber---------More Positive--More Negative
Rear Camber------More Negative-----More Positive
Front Springs----------Stiffer-------------Softer
Rear Springs-----------Softer------------Stiffer
Front Anti-Sway Bar-----Stiffer------------Softer
Rear Anti-Sway Bar----Softer-------------Stiffer
Toe In-----------------Increase----------Decrease
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