Chassis Setup and Troubleshooting

 

Troubleshooting Tire Temps

Symptom Diagnosis
Center hotter than edges Tire pressure too high.

Reduce 1 psi (0,07bar) for each 5° F (2,75° C) delta

Edges hotter than center Tire pressure too low.

Add 1 psi (0,07bar) for each 5° F (2,75° C) delta

Inner edge hotter than outer Too much negative camber
Outer edge hotter than inner Not enough negative camber or too much toe-in
Tire below ideal temperature range Tire pressure too high or Tire too wide or Springs/sway bars toosoft at that axle
Tire above ideal temperature range Tire pressure too low or Tire too narrow or Springs/sway bars toostiff at that axle
Front tires hotter than rear Car is under steering (pushing) or Too much front spring/sway bar or Not enough rear spring/sway bar or Front pressure too low or Rear pressure too high or Front tires too narrow or Rear tires too wide
Rear tires hotter than front Car is over steering (loose) or Too much rear spring/sway bar or Not enough front spring/sway bar or Rear pressure too low or Front pressure too high or Rear tires too narrow or Front tires too wide

A 1 Celsius change is a change of 1.8 Fahrenheits while a 1 Fahrenheit change translates to a change of 0.55 Celsius.
This is one of the easiest way to convert them if you know that 0°C = 32°F

 

Correcting Over- or Understeer

Symptom Diagnosis
Reduce Oversteer Reduce rear pressures or increase front pressures
Increase Oversteer Increase rear pressures or reduce front pressures
Reduce Understeer Reduce front pressures or increase rear pressures
Increase Understeer Increase front pressures or reduce rear pressures