Not a good result I'd imagine, part of the efficiency of turbocharging a diesel engine comes from utilising the waste energy from the exhaust gasses, a diesel engine is perfect for this as the rate of gas burn (actually a degree of afterburn) is perfect for driving a turbine. Supercharging on the other hand is a mechanical process, robbing power from the crankshaft rather than the rate of expansion and velocity of waste gasses.
The other issue is a problem that exists with any diesel 4 cylinder engine is the destructive torsional vibrations, enough to do most superchargers a hard time in the shafts and bearings.
I would be thinking down the turbocharging route, maybe picking a particular housing and turbine wheel combination to reduce lag, and intercooling isn't all that necessary below 10psi anyway.
Mine has got almost 600,000km up now, a 4BD1 doesn't need all that much fuelling to produce decent torque figures which in turn keeps the exhaust gas temps at a reasonable level.
JC
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