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Originally Posted by cssnms
They are both piggybacks and I do believe the VAC and JBD operate and make power in a very similar manner, in that they both intercept the signal from the ECU to the high pressure rail sensor, in short they are signal benders. The only way to effectively modify injection timing is by reprogramming the ecu.
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In that case I'm not sure how to interpret the information on the VAC
info page:
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Q) With more power, how does my car not consume more fuel? Will it be as reliable?
This is a logical and completely normal question from a gasoline car perspective. Know that the diesel engine is always ingesting the same amount of air per revolution as there is no throttle plate in a diesel engine. What we do is alter how and when fuel is delivered without increasing the amount of boost or fuel.
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What does that mean, exactly?