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Message: [QUOTE="Charles, post: 1015095, member: 103"] My calcs from the hip were ~780 for the tp38 and ~907 for the M122. Thing is, a bigger supercharger never fixes the fact that it will make the most boost when you're using the least power, and make the least boost when you're making the most power.... ass backward. That's because a fixed displacement unit is ahead of a dynamic unit. All you would need do is place the unit you have (or a smaller one even) directly on the engine and let a turbo feed it. Then the blower size and pulley can be figured directly, exactly as designed, and the turbo can pump up the ambient air density, again, exactly as it was designed. As long as you didn't get the turbo too fiesty or the blower output too low, creating a pressure drop post blower, then the turbo boost wouldn't try to shove the rotors down the intake manifold. The blower would take the 7.3 from 300ish CFM up to 5 to 600ish CFM and still be efficient. This would let you run a large single charger to bring some ice cold air to the party, and it would get up on that charger fast because the charger would only see the blower displacement, making it think it was on a 14 or so Liter engine! Talk about getting on top of a charger... Think 88mm charger or so. Here's the kicker.... it would still spool a bit [i]slower[/i] than a compound setup with the same pressure ratios per stage because the blower can't come up on boost any faster than it's pulley, whereas the turbo can jump on boost as soon as exhaust drive permits. And it would consume more power, putting less to the ground. And it would make the boost it made less efficiently as well. [/QUOTE]