Originally Posted by SLK32Germany
Brian,
would you say the article in my first post has wrong information?
There it is said, that the supercharger spins 3,3 times faster than the crank? This would mean that with the stock pulleys the supercharger spins already 20.526 RPM at redline 6.220 RPM ? This would mean there is no safety zone if you run a tuning pulley at redline ?
Bruno
With a ratio of 3.3 and a stock crank pulley of 155mm the S/C pulley would have to be 46.97mm. 155 / 3.3 = 46.97 or to find the ratio 155 / 46.97 = 3.3
Since I have both the factory crank pulley off the car and the surpintine belt off the stock supercharger pulley, and I can measure both, the article does not add up. Perhaps they got some numbers from the C32 and SL55 numbers crossed.