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Welcome,
Great to have you on board.
I'll open up with some questions.
My priorities in order are reliability, economy, performance.
My vehicle is powered by a turbo diesel engine (ZD30 Di), I have done a lot of trials playing with the Variable nozzle control on the turbo, have tried manual controls, but am currently running with ECU control.
My most recent mod was improving air supply to turbo by accessing the pressure at the front of the vehicle, like a ram air setup, response, power & economy all improved. On that mod my assumption is if I can increase pressure to the turbo, then that will reduce exhaust pressure drop across turbo, hence improving exhaust flow and reducing pumping losses.
The first question is, under load increased pressure to turbo is good, but when coasting down, no load, will the engine run more freely if I also restrict the intake, noting I already open the VNT fully to allow a more free exhaust flowundere this condition?
The other thing that I am exploring is whether running at lower boost will give better economy figures, provided the EGT's stay in an acceptable range, is this the right direction?
And in general, any pointers for achieving the best economy from a modern diesel engine?
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