Joined: 22 Aug 1999
Location: Seattle, WA USA
|Posted: Wed Jan 05, 2005 10:16 am Post subject: Suspension Setup
|Some advice on suspension setup from fellow local racer, Greg.
a. Find out what your car should be set up like by asking other racers with similar cars and checking race alignment shops for recorded data.
b. Research the tracks that you plan to drive.
c. Determine the cost of the suspension mods and trim to fit your budget by prioritizing these mods based on bang for the $
a. Shop around and weigh vendor benefits and performance.
b. Purchase parts in time to get them installed before big race.
3. Measure gains
a. Make one mod at a time and drive that set up a few times to determine the benefit from your $$
b. Keep a driver log recording your tires, track conditions, driver ability, lap times
Shocks may be the most important modification you can make. If the wheels stay in contact with the track you can drive the car deeper, faster, and still be in control. Shocks keep the wheels from bouncing and allow the wheels to return to the track after a big bump. Shocks are quick transition dampers.
Sway bars or anti sway bars if you prefer help keep the car flatter in turns. A flatter car has more equal traction on all tires.
Springs allow bumps to be absorbed, determine the ride height, the ultimate sway, roll, for and aft pitch for a given g force. Spring height if adjustable helps corner balance the car so all tires share traction the best.
Shock selection shocks must match spring rates and track conditions. A damping analysis can be run if you have all the critical car data. If you dont have the data go with proven combinations from people who understand race cars.
Setup scales on flat ground
Warm up scales keep temperature constant if possible
Inflate tires to same pressure higher than normal say 45 lbs
Measure weights with driver in the car with normal fuel load
Add ballast if necessary to get to required race weight
Adjust spring perches to get desired corner weights
Keep ride height legal[Pro3 5"]
Opposite corners should sum to the same weight
Fore and Aft weight should be as close as possible
Adjust per your research
Drive the car with a one size fits all setup until you have the driver skills to know the difference
Adjust the caster camber per the track driven and weather conditions when you learn what works. Practice new set ups on test and tune days or on practice session, but not for the race.