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Manifold pressure ("boost") and pyrometer gauges are what you are looking for. If boost is low (before turbo really starts cranking), and exhaust gas temperature (pyrometer) is low, then so is fuel consumption.
Depending on your vehicle it may be the point that, on a graph, where the HP and TQ curves cross. And just a little before.
On my truck that equates to below 600F and up to about 1,725 rpm.
Most modern on-highway diesel are capable of BSFC's in the low .300's or better (high .200's) at cruise rpm.
Find that match and benefit.
Last edited by slowmover; 06-14-2010 at 12:38 AM..
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