These fixes are generally for road racing, but you can still use the know how.../rj

Tires running cool (below 200):

a. stiffen shock of tire
b. lower air pressure

Tires running hot (above 250):

a. soften shock of tire
b. raise air pressure
c. lift off gas earlier when entering turn

Uneven tire temperatures:

Outside of tire hotter: add negative camber
Middle of tire hotter: decrease air pressure
Middle of tire cooler: increase air pressure
Inside of tire hotter: add positive camber

Setup Terminology:

Loose: rear tires loose grip before front tires
(Going into turns the rear end of the car seems to slip away and you spin out or lose control from the rear.)
Tight: front tires loose grip before rear tires
(You can't seem to turn very much - the front of the car heads for the wall.)

Loose conditions:

Overall (everywhere):
a. move weight forward
b. increase cross weight
Turn entrance:
a. stiffen right front shock and/or soften right rear shock
Turn apex:
a. stiffen right front shock
Turn exit:
a. stiffen left front shock and/or soften left rear shock

Tight conditions:

Overall (everywhere):
a. move weight back
b. increase stagger
c. decrease cross weight
Turn entrance:
a. soften right front shock and/or stiffen right rear shock
Turn apex:
a. soften right front shock
Turn exit:
a. soften left front shock and/or stiffen left rear shock

Notes:

1. On ovals, left side weight should be at maximum except on tracks
with very steep banking (and even then, you may not want to move it much.)
2. Set fourth gear for max RPMs at end of fastest straight; first
through third for best acceleration
3. Rear spoilers can be lowered on faster tracks, but this will
adversely affect handling in traffic or in turns - this often loosens the car up.
4. Your best bet is to keep the car a little loose for the race - you can add some rear
wedge on a pit stop if you want to tighten the car up. A loose race car is often
faster than a tight one.