Brock’s Performance president, Brock Davidson, an avid performance enthusiast and past national championship winning rider as well as tuner, explains how to adjust the rear suspension on his BMW S1000RR ‘Christine’ for drag race use.
Follow along as he explains how the rebound dampening functions as it relates to the launch and down track acceleration between himself and his lighter ‘jockeys’.
Note: At 9/16th sag using a 95 Newton (542 lb.) spring with a 150 lb. rider in the saddle, a rear tire pressure of 12 psi is used. Brock’s weight of around 210 lbs. suited brings the sag to 1″ and a tire pressure of 18 psi is used.
The bike squats a bit more than optimum, which means the spring preload should be increased a bit, or the spring rate might need to be increased — BUT, the object is for this bike to be as fast as possible with the smaller riders–not tuned for him–so only tire pressure adjustments are made.
Slick track = more rebound dampening added, more squat for more traction. Less tire pressure, if possible.
Sticky Track = more spring preload, less squat, more tire pressure… although light riders tend to spin, so lower pressure is generally used. (see Jeremy’s run at beginning of video, it is very close to perfect.)
Special thanks to www.dragbikelive.com for the video coverage.
Also note: This advice applies to all makes and models. The BMW S1000RR shown was simply used as a handy example for this particular video. Spring rates will differ between makes/models.
Visit www.BrocksPerformance.com for additional information, installation instructions, information forums and FAQ sections.
For additional “how to’ videos and information please visit our “Tech. Department” section of Dragbike Live.com. Text/video courtesy Brocks Performance
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