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Expert: - 4/6/2004


Question
hello dear sir,
what is the best location for roll centers in vehicle suspension?

Answer
Hello Vahid:

Best location for roll centers for racing is as low, and as close to the centerline, as you can get them. It is theoretically possible to have them BELOW the ground on which the car is travelling, but this takes considerable design work, and is not possible when modifying a street car.

For street use, that would produce a very harsh ride, and you would want to raise them by about 15 % .

Hope this is a help

Dan Liddy
Sarasota, Florida USA  

Auto Racing

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Dan Liddy

Expertise

Anything concerning race cars, 20 years competition experience, Senior Competition Driver Instructor , car builder, mechanic, welding, fabrication, tuning , engine modifications, set up, suspension design. Specializing in Datsun/Nissan products. Please submit questions about RACE CARS ONLY. No street cars, no video game scenarios Thank you.

Experience

I have been racing for 20 years, I have been the Central Florida SCCA Regional Championship points for 5 years running, and won the championship in my class 2 times. During my first start in the 60's I won many solo awards and the State Championship Drags. I serve as a senior instructor for SCCA, and have taught in Mercedes AMG events at Daytona, and Dodge Viper Days at Sebring International. I have been in the thick of the competition for all of my career. At one time or another I have driven race cars at speeds nearing 195 MPH. It's quite a ride !

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