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Good to hear your happy with the car Riley. The power on your dyno sheet is hp at the wheels. As i said to you at the time 279hp did seem very high compared to others previous to that. The main difference we saw was that when most standard 1uz's start falling over in torque and power yours...

Well see the thing is... lets say you just supercharge the 4.7 with the M112. Then assuming a redline of 7000rpm, and max rpm of 13 500 on the M112 (from Eaton website) this means you will only be making ~4psi boost - not really worthwhile. And if you have a look at a GT40R compressor map...

No, it won't. Bad analogy. Read back through the thread - a roots SC is a positive displacement pump which doesn't care about the air density at its inlet. SC works on pressure ratio - if it makes 0.5bar outlet boost with atmospheric inlet pressure (pressure ratio 1.5) then with 1 bar inlet...

Ok, so I'm just checking your numbers here (pinch of salt taken with the estimates and all that) but it does look like the M112 is too small for the motor. If you assume that you can only drive it to 13 500 rpm safely then on the rough estimates I've done that is a belt ratio of ~1.9 for max...

As above, if you think of it as turbocharging a supercharged engine (sc'd engine just acts like bigger displacement) then just size a turbo for that HP goal on the motor... IE 4.7L with eaton M112 (flow map here - http://www.eatonperformance.com/superchargers/M112-performance-map.html )...

Between reading the thread here and on Eng-tips, your informative posts have got me very interested in compounding, Warpspeed! I see it being exceptionally useful for very high boost generation. A couple of comments: In terms of sizing/selecting turbocharger, would one way to think of it as...

C'mon man, use Engine Analyzer, thats why I gave it to you! Do a simulation for NA then multiply the flow rate by the boost you want to run.