Quote:
Originally Posted by paulgato
what is the issue with the turbo? Can I not simply kill the fuel injector pump? What is the difference between that and keying off and on again? (...other than wear and tear on the ignition switch of course.)
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As mentioned above, the turbo can fail if it's not allowed to cool prior to the engine being switched off. The usual recommendation is to let the turbo cool for 30 seconds after a high boost event before switching off. TDI's are on boost at normal drive speeds much more so than petrol turbos typically would be (although modern low pressure petrol turbos share a similar duty cycle). In short you can't P&G (EOC) a TDI like you can a petrol, because it's high load/ boost then engine off. Diesels use so much less fuel at idle that petrols that the EOC advantage isn't that great. Ever wonder why few if any turbo diesel hybrids exist? Potential economy would be astronomical, but an exhaust driven turbo wouldn't last.
Ideally, I'd love to swap my T5's exhaust driven turbo for an electric supercharger someday, then I could add a 4motion rear axle with electric motor and I'd have the best of everything, 900Nm of torque combined, 4wd and 60MPG
DFCO in a diesel means a lot of air is being drawn in with no heat being added, a great way to cool your turbo prior to shut down.
As for wiring the kill switch to the PD pump, I'm not sure, my 2007 pump is still mechanical. I think for the relatively occasional EOC opportunities with a TDI, a kill switch is a low priority.