tires and wheels From the lab... something for you autox guys.. quick refere

[Guest Anonymous]

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

[Guest Anonymous]

It's always worth it to play with tire pressures at the course....I run Hoosier 225/45 13 A3SO3's. I have eibach springs bilstein sports and 22mm front and rear sways....At the last auto-x I found my optimal tire pressures to be 38 psi in the front and 28 psi in the rear..At that point the car handles pretty neutral...

Ryan

68 02