Understeer/Oversteer

[goomer416]

Found this in Import Performance:

Adjustment_________|___Increase OS____|___Decrease OS
Front Tire Pressure__|___Lower_________|___Higher
Rear Tire Pressure___|___Higher________|___Lower
Front Tire Section___|___Smaller_______|___Larger
Rear Tire Section____|___Larger________|___Smaller
Front Wheel Camber_|___More Positive___|___More Negative
Rear Wheel Camber _|___More Negative__|___More Positive
Front Springs_______|___Stiffer________|___Softer
Rear Springs________|___Softer________|___Stiffer
Front Anti-Roll Bar___|___Stiffer(Thicker)_|___Softer(Thinner)
Rear Anti-Roll Bar____|___Softer(Thinner)_|___ Stiffer(Thicker)
Weight Distribution__|___Move Forward__|___Move Rearward


Hope it will help some of you guys out!

[Ukrainamese]

This is... confusing...

[97EK5door]

Found this in Import Performance:

Adjustment_________|___Increase OS____|___Decrease OS
Front Tire Pressure__|___Lower_________|___Higher
Rear Tire Pressure___|___Higher________|___Lower
Front Tire Section___|___Smaller_______|___Larger
Rear Tire Section____|___Larger________|___Smaller
Front Wheel Camber_|___More Positive___|___More Negative
Rear Wheel Camber _|___More Negative__|___More Positive
Front Springs_______|___Stiffer________|___Softer
Rear Springs________|___Softer________|___Stiffer
Front Anti-Roll Bar___|___Stiffer(Thicker)_|___Softer(Thinner)
Rear Anti-Roll Bar____|___Softer(Thinner)_|___ Stiffer(Thicker)
Weight Distribution__|___Move Forward__|___Move Rearward


Hope it will help some of you guys out!


That really interesting, cheers man, Now all ive got to do is figure out what it means

[turbohappy]

What car is this supposed to be for? Most of it seems wrong.

[gpny]

It doesn't show up well but it's a chart. The first column is the parameter being adjusted, the second column is what to do to the parameter to increase oversteer, and the third column is what to do to the parameter to decrease oversteer.

For example:
1) Front Tire Pressure |Lower|Higher -- Lower front tire pressure makes for increased oversteer, and increased front tire pressure decreases oversteer.

2) Rear Tire Pressure |Higher|Lower -- Higher rear tire pressure makes for increased oversteer, and lower rear tire pressure decreases oversteer.

The chart is accurate as long at you don't take the modifications to the extreme (IE seriously decreasing front tire presure could cause a blowout, but slightly decreasing front tire pressure would increase front tire grip (say 30psi vs 35psi) and increase oversteer comparatively.

Hope this explanation clears stuff up.

EDIT - I just looked at it again and some of the chart parameters are wrong...

[turbohappy]

Tire pressures and weight distribution are a little more complicated than just a chart (there are more variables), all the rest are pretty much completely wrong (backwards).

[gpny]

Tire pressures and weight distribution are a little more complicated than just a chart (there are more variables), all the rest are pretty much completely wrong (backwards).

Yeah I did the the explanation on the tire pressures before scrolling down... The tire size, and anti roll bar sizes are flipped...

[turbohappy]

Yeah I did the the explanation on the tire pressures before scrolling down... The tire size, and anti roll bar sizes are flipped...
As are camber and springs.

Tire pressures are a bit more complicated. It's not simply raising/lowering. There is a tire pressure which gives max grip, you can find this with chalk or just look at the wear on the tire and get it right out to the edge, where raising the pressure causes the wear to be over a narrow band. Take that max grip pressure and you have this...
Front tire pressure: Towards max grip -> oversteer, Away from max grip -> understeer
Rear tire pressure: Towards max grip -> understeer, Away from max grip -> oversteer

It doesn't matter if you're raising or lowering, it's your proximity to the max grip pressure that is important. There are side effects to which one you choose, but for simplicity it's the same.