[masterp2]

Harry, I am interested in your results. I have done some post compressor temp and pressure monitoring, but not with WI yet. I did it in conjunction with evaluating larger boost tubes. Used a nifty 4-channel temp datalogger.

If you have a VGT, and if it is like others I have seen, the WI should lower discharge pressure, while maintaining equal plenum pressure. Curious if you find this to be true. The effect should be magnified in systems with a lot of pressure drop, high IAT, and high boost/low efficiency/off map operation.

Anyway, all this means that for a given boost, is less wok that turbo must perform, and lower final charge temps, better charge density, hence better economy. For those that tow, and have a thermo-viscous fan, the fan can be kept off with lower CAC heat rejection, and this can be a huge benefit.

That's the theory anyway.