Dragshock™ / Dragshock EZ™ Suspension Demonstration
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.)
Bumpy Track = If the racing surface is exceptionally bumpy, the rebound dampening must be reduced (example adjust from -15 clicks to -20 clicks) to prevent high speed 'oscillation'.
Stock or Short Wheelbase Applications = Stock/Short wheelbase bikes do not require as much 'squat', because they are not as prone to spinning. Since more squat leads to additional traction, this can also cause stock wheelbase bikes to wheelie. As a result, we would have a bit more static spring pressure dialed in, with more compression dampening and less rebound dampening (to force the front end back down as the rear rises).
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 http://www.BrocksPerformance.com for additional information, installation instructions, information forums, and FAQ sections.
BMW S1000RR Runs a 8.44et at 161mph in 1/4 mile! Stock Engine!
Dragbike Live was on location at the 2010 Citrus Nationals in West Palm
Beach at Palm Beach International Raceway as history was made aboard the
new BMW S1000RR as Jeremy Teasley riding for Brocks Performance ran an
incredible 8.44 elapsed time at over 161 mph aboard the BMW Performance
Center's S1000RR drag bike after it was rode 700 miles from the Greer South
Carolina headquarters to Palm Beach International Raceway.
When Dynos Go Wrong: Diagnosing and Curing Problems After A Disappointing Test Session
Procedures/Efforts used to increase the Will Torres BMW S1000RR power from
176 RWHP to 198 RWHP (SAE SCALE)
• Drained Fuel and replaced with VP MR12
• Drained Oil and replaced with Alisyn Less Than Zero Weight Full
Synthetic Motor Oil with Petron Additive
• Went for 10 mile ride (before Dyno session) to allow Petron to
• Removed aftermarket street style air cleaner, and installed OEM air
(Suggested Filter for Peformance Gain:
• Cleaned chain with Motul Chain Clean
• Lubricated chain with Alisyn Chain Lube
• Removed noise reduction plug from Exhaust
• Re-installed Brock's Performance CT Single Map in Dynojet PCV
• Adjusted chain to proper tension
Visit http://www.BrocksPerformance.com for additional information,
installation instructions, information forums and FAQ sections.
To read this entire story on BrocksPerformance.com with more info.:
Brock's Performance - Passion and Performance
At Brock's Performance, we strive to lead in the innovation, research and
development, manufacturing and distribution of performance components and
associated information in the motorcycle industry. Specializing in racing
and street oriented products designed for maximum performance.
Visit and shop with us at http://www.BrocksPerformance.com/ and
setting suspension sag
Robert Taylor, Öhlins suspension guru from Crown Kiwi Technical shows us
how to set suspension sag on track day and road bikes.