wgnths
05-05-2005, 09:42 AM
heres a little info i took from nasioc regarding under/oversteer. pretty accurate but use as a general rule and not vehicle specific. the biggest thing pointed out, was the fact that adding frt/r sway bars WILL increase traction overall.....period!
TO REDUCE UNDERSTEER or INCREASE OVERSTEER:
Front tires:
- Increase tire pressure in 2.5psi increments
- Increase Section Width
- Lower the Aspect Ratio
- Reduce front tread depth
Rear Tires:
- Reduce tire pressure in 2.5psi increments
- Reduce section width
- Install higher aspect ratio tires
- Increase rear tread depth
Front Wheels:
- Install wider wheels
- Install lighter wheels
Rear Wheels:
- Install narrower wheels
- Install heavier wheels
Front Alignment settings:
- Dial in more negative camber
- Dial in More toe-out
- Dial in more positive caster
Rear Alignment settings:
- Dial in more positive camber
- Dial in more toe-out (Same as front)
Anti-Sway bars:
- Soften the Front
- Stiffen the Rear
Spring rates:
- Soften the Front
- Stiffen the Rear
Shock absorbers:
- Soften the Front
- Stiffen the Rear
Suspension Bushings:
- Soften the Front
- Stiffen the Rear
Brake Proportioning
- Reduce Front brake pressure
- Increase rear pressure
Weight Distribution
- Reduce front weight
- Increase rear weight
Aerodynamics:
- Increase Front Downforce
- Reduce rear downforce
---------------------------------------------------------------------------------
TO REDUCE OVERSTEER or INCREASE UNDERSTEER:
Front tires:
- Decrease tire pressure in 2.5psi increments
- Decrease Section Width
- Install higher Aspect Ratio tires
- Increase front tread depth
Rear Tires:
- Increase tire pressure in 2.5psi increments
- Increase section width
- Reduce aspect ratio
- Decrease rear tread depth
Front Wheels:
- Install narrower wheels
- Install heavier wheels
Rear Wheels:
- Install wider wheels
- Install lighter wheels
Front Alignment settings:
- Dial in less negative camber
- Dial in less toe-out (to toe-in if needed)
- Dial in less positive caster
Rear Alignment settings:
- Dial in less positive camber
- Dial in less toe-out (Same as front)
Anti-Sway bars:
- Stiffen the Front
- Soften the Rear
Spring rates:
- Stiffen the Front
- Soften the Rear
Shock absorbers:
- Stiffen the Front
- Soften the Rear
Suspension Bushings:
- Stiffen the Front
- Soften the Rear
Brake Proportioning
- Increase Front brake pressure
- Reduce rear brake pressure
Weight Distribution
- Increase front weight
- Decrease rear weight
Aerodynamics:
- Reduce Front Downforce
- Increase rear downforce
TO REDUCE UNDERSTEER or INCREASE OVERSTEER:
Front tires:
- Increase tire pressure in 2.5psi increments
- Increase Section Width
- Lower the Aspect Ratio
- Reduce front tread depth
Rear Tires:
- Reduce tire pressure in 2.5psi increments
- Reduce section width
- Install higher aspect ratio tires
- Increase rear tread depth
Front Wheels:
- Install wider wheels
- Install lighter wheels
Rear Wheels:
- Install narrower wheels
- Install heavier wheels
Front Alignment settings:
- Dial in more negative camber
- Dial in More toe-out
- Dial in more positive caster
Rear Alignment settings:
- Dial in more positive camber
- Dial in more toe-out (Same as front)
Anti-Sway bars:
- Soften the Front
- Stiffen the Rear
Spring rates:
- Soften the Front
- Stiffen the Rear
Shock absorbers:
- Soften the Front
- Stiffen the Rear
Suspension Bushings:
- Soften the Front
- Stiffen the Rear
Brake Proportioning
- Reduce Front brake pressure
- Increase rear pressure
Weight Distribution
- Reduce front weight
- Increase rear weight
Aerodynamics:
- Increase Front Downforce
- Reduce rear downforce
---------------------------------------------------------------------------------
TO REDUCE OVERSTEER or INCREASE UNDERSTEER:
Front tires:
- Decrease tire pressure in 2.5psi increments
- Decrease Section Width
- Install higher Aspect Ratio tires
- Increase front tread depth
Rear Tires:
- Increase tire pressure in 2.5psi increments
- Increase section width
- Reduce aspect ratio
- Decrease rear tread depth
Front Wheels:
- Install narrower wheels
- Install heavier wheels
Rear Wheels:
- Install wider wheels
- Install lighter wheels
Front Alignment settings:
- Dial in less negative camber
- Dial in less toe-out (to toe-in if needed)
- Dial in less positive caster
Rear Alignment settings:
- Dial in less positive camber
- Dial in less toe-out (Same as front)
Anti-Sway bars:
- Stiffen the Front
- Soften the Rear
Spring rates:
- Stiffen the Front
- Soften the Rear
Shock absorbers:
- Stiffen the Front
- Soften the Rear
Suspension Bushings:
- Stiffen the Front
- Soften the Rear
Brake Proportioning
- Increase Front brake pressure
- Reduce rear brake pressure
Weight Distribution
- Increase front weight
- Decrease rear weight
Aerodynamics:
- Reduce Front Downforce
- Increase rear downforce