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Modifications and the consequences


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The under/over steer phenomenon has been exampled here in wim but there are some direct or indirect consequences for the Modified car you may find interesting either to exploit or belay.

 

Component___________________Reduce Under-steer_____________Reduce Over-steer

Weight Distribution....................Centre of gravity toward rear....................Centre of gravity toward front

Front coils..................................................Softer...................

................................. Stiffer

Rear coils.................................................Stiffer...................

....................................Softer

Front sway bar..........................................Softer.............................

..........................Stiffer

Rear sway bar...........................................Stiffer...........................

............................Softer

Front tyre selection (1)....................Larger contact area (2)..............................Smaller contact area

Rear tyre selection.........................Smaller contact area..................................Larger contact area (2)

Front wheel rim width/diameter...............Larger (2)...................................................Smaller

Rear wheel rim width/diameter................Smaller.................................................

....Larger (2)Front tyre pressure............................................Higher pressure...........................................Lower pressure

 

Rear tyre pressure..............................Lower pressure...........................................Higher pressure

Front camber................................Increase negative camber............................Reduce negative camber

Rear camber..................................Reduce negative camber............................Increase negative camber

Rear spoiler.............................................Smaller.....................

..................................Larger

Ride height front.......................................Lower...............................

...........................Raise

Ride height rear........................................raise...............................

............................lower

Front toe................................................Increase.....................

.................................Decrease

Rear toe................................................Decrease.....................

.................................Increase

 

(1) Tyre contact is increased by using wider tyres, or tyres with less grooves in the tread, but fewer grooves has the opposite effect in wet weather.

(2) These improve road holding, under most conditions.

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