[Thighsolator]

that is some interesting stuff vanir, so if i understand you... to keep the manifold pressure low enough to prevent detonation, with the supercharger in gear and MW50 spraying, you have to lower the throttle... right? full throttle with supercharger in first gear and low altitude and MW50 should considerably raise the manifold pressure and cause detonation, if i understand correctly. This will result in higher horsepower and eventually engine damage, but as altitude goes up, atmospheric pressure decreases and you can't maintain the manifold pressure. How many stages did the DB603 and Jumo 213 superchargers have? GM1 was used at high altitude because of better oxygen supply that it provided, and that would be why the H models came with both boost systems