that is the pipe from the turbo which controls the diaphragm in the pump to give more fuel when under boost, not the other way round. the only thing that controls the boost is the wastegate which can be adjusted manually.
the n/a pump does not have this obviously.
running a 12j with a turbo would be ok with mild boost but long term could do some damage as the engine would be runnng too lean.
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There is no such thing as a diesel engine running too lean.
This can only happen in spark ignition engines, where the fuel and air are mixed prior to entering the cylinders. Lean MIXTURES of fuel and air in spark ignition engines usually result in over-heating and burning of valves spark plugs and even pistons.
In compression ignition engines with fuel injection into the combustion chamber the fuel ignites in a stream
as it exits the injector tip. It does not all go in and THEN ignite.
Bearing in mind that the engine takes in full air all the time, the power output is controlled ONLY by the amount of fuel introduced into that full air charge.
On tickover very short fuel stream - hardly any.
On light throttle short fuel stream
On more throttle longer fuel stream.
But at no stage can there be a lean mixture, because there is no "mixture".
What could happen in the NA engine with turbo is too much boost might increase the effective compression too far, but I don't think it would matter. The efficiency and economy would be better for sure, and a slight performance gain.
CharlesY
