Quote:
Originally Posted by JimMoore
Thanks. I was having a little trouble following exactly which mods were made. It looked like the graphs were for sprockets + induct + (maybe?) rechipping. Is there one for stock vs sprckets only?
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Here you go, this is for an R1100S.
BikeBoy.org - BMW R1100S With Boxer Performance Cam Sprockets
Quote. "The improvement isn’t large, and I’m sure the drop at the top of the graph will be interpreted by some as a catastrophe by some (that’s what people do). But unless you’re running it over 7,500 RPM often (and need the power over 7,500 RPM) it’s not really a big issue. And there’s a pretty consistant 3 – 5% from 2,500 to 6,500 RPM. The biggest change I noticed when we were doing mine all that time ago was the improvement in part throttle response. Just makes them feel stronger in the lower rev range, especially helping drive out of corners."
The consensus seems to be that the R1200 gains more from the sprockets then the R11, and the improvement in part throttle performance is greater than the full throttle graph indicates.
Anyone who has fitted the sprockets will tell you the improvement in low to mid range torque is obvious and enjoyable. The engine can be used down to 1500rpm in high gears without complaint, cant do that with the standard setup.