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Power Strokes
6.4 Aftermarket
6.4L ProCharger/SuperCharger/Turbo Charger Compound Setups
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[QUOTE="Charles, post: 14832, member: 103"] It took a lot more than that to drive. When running compounded the 42 would have had to have been running a way, way lower PR if the manifold pressure was identical between the runs with and without the PC in the circuit. When the belt was removed the gate would have closed down more and forced the turbo to produce the full desired manifold pressure in a single stage, meaning the power the turbine was forced to extract from the exhaust went up tremendously vs when it had the PC compressor doing work and powering itself through the serpentine that was burning up trying to supply this power. The 20hp is the [i]additional[/i] parasitic loss of the mechanical drive. Or in another sense, it tells you the power the turbine is able to extract by way of latent exhaust heat that is otherwise wasted on a belt-driven setup. What would really be an eye-opener would be to run the engine with a single stage PC alone. Then you would see even lower power output still as it would be making no use of the latent heat in the exhaust at all. In this case the PC had the benefit of splitting the stage between itself and the 42, whereas the 42 had to do it all by itself. If you forced the PC to do it all by itself the power would be even worse. Or conversely, if you allowed the 42 to work in conjunction with another turbine powered compressor in a compound turbo setup, it would have made even more than 640. But the total power required to drive the PC was far greater than 20. Depending on flow and pressure it would not be uncommon to tack another 100 or more in front of that. You don't shred 8 rib serpentines at 20. [/QUOTE]
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