I am starting to look into the use of a low boast(5 psi) turbo on an old D-jet system. Has anybody tried this before?
I am starting to look into the use of a low boast(5 psi) turbo on an old D-jet system. Has anybody tried this before?
Might depend a bit on the system. I'm not familiar with how the Porsche D-Jet is put together, but on a Volvo I'd be leery. D-Jet is not a "closed loop" system, so it doesn't monitor the air-fuel ratio in any way. If you start pumping a lot more air into it, I'm not the ECU has the mapping to compensate. Maybe (BIG maybe) if you move the vacuum sensor port ahead of the turbo inlet, it might work. Might.
D-Jet is a decent system and it's amazing it works as well as it does 40+ years later, but it does have limited operating parameters and can get weird if you try to run an engine that operates outside of the design specs.
One of the solutions is to put a very low pressure switch in and fire an additional injector for boost fueling. Not the most elegant way to make it work, but fairly easy and has been know to work in the past.
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