Quote:
Originally Posted by Christ
1. Why won't a vacuum gauge work for you? Even if you're boosted, you're still in vacuum before the turbo spools, so the idea would be to keep out of boost as much as possible.
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Diesels don't have a throttle and hence don't have a vacuum. Any thing that requires a vacuum is driven off of a vacuum pump.
Unlike a gas engine, diesels do not require a fixed fuel mixture to run right. In fact they run better the leaner the combustion gasses. Boost actually raises the efficiency of a diesel engine and will do so up until the point air starts to liquify. There is a break even point however where it takes more energy to create the boost than is recovered by the efficiency increase and thus boost beyond this point reduces net efficiency.
Generally however, if you drive so that your engine is generating the least amount of boost it is an indication that your pistons are extracting the most energy they can.
This does not mean that you should modify your engine to reduce boost or try and prevent your intercooler from reducing intake manifold temps in any way.