[JohnJL]

Thanks guys. I'll try to get all this in...

Adam, thanks for the message, I've replied. I agree, I also have Ray's dyno charts here and he was different results. My supercharger is 1 size larger and of the same design and manufacturer as Ray's. His is an autorotor 3150, mine is a 417. His puts out 1.5l per revolution, mine (is supposed to) put out 1.7l per revolution. His is running an 80mm supercharger pulley, mine is 60mm. Both our crank pulleys are 120mm. We use the same belt.

The supercharger is geared so it hits its maximum continuous-rated speed at 6500 rpm. So at 6000 rpm (3000 engine rpm, where things seem to go awry) it still has a lot of headroom.

Eric, that's an interesting comment on plugs. Hans also said that same result occurred with an Audi tuner in the US. I have iridium plugs gapped .85mm. Tops are one range cooler than the bottoms.