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Hi dremd,
Sorry if you felt I was being simplistic. But your comments were phrased simplistically. You apparently have more practical knowledge of Turbos than I.
But the method being proposed has been researched by NASA, although not used in production practice. They put little holes on the downstream side of a wing, and injected bleed air from the jet engine through the holes. The goal was prevent flow seperation at low speeds. Inflating an air bag at the back of the car would be alont the same lines. One might actually be able to combine the two, and put small holes in the air bag.
If there is no waste gate operation at highways speeds, there is no bleed air available for this.
If you bleed air off the TDI turbo, will the variable geometry control be altered to bring the pressure back to what it supposed to be ? As you alluded to, there will be effective comprssion ratio lost however. Maybe the VGT control is just shooting for as high an ouput pressure it can achieve, all the time in the TDI ? As the fuel is going to detonate anyway...
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