The boys at detroit diesel figured out that adding a compound turbo after the regular turbo increases the effectiveness of the new pollution control equipment required by the new stricter pollution regs.
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You could say that but the way I read it this isn’t your typical compound turbo app where you’ve got turbo’s in “series” with the 2nd getting the last bit of power and engine heat and blowing into the intake ,, in this case the second turbo seems to be connected to a hydraulic pump/motor that drives the tranny output shaft .. the same way a/c compressors are remote mounted and hydraulically driven on many busses and the compressor side of the turbo is not mentioned in the article... it could go to the intake or it could go to waste ... the only thing for sure is that exhaust back pressure is greatly increased as EGR recirc is off the charts.
I think you are not understanding what a compound turbo is. A compound turbo doesn’t HAVE a compressor side.
I agree that the 2nd turbine must be direct connected to the out put shaft as I don’t see how pumping more air into the intake will help any thing, as we don’t use all the output of the first turbo.
barbra ann