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Old March 25th, 2008, 15:51   #12
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Join Date: May 1999
Location: Canada

Originally Posted by Bob_Fout
Found it. DBW had it in his pics.

This chart only shows BSFC at full load at the given RPMs. However, nobody drives at full load under normal circumstances.

A more useful map of BSFC over the entire range of operating speeds and loads (BMEP) is below, for an ALH TDI:

It can be seen that the minimum BSFC of 197 g/kWh occurs at around 1750 RPM and just shy of the full-load curve. However, a steady cruise, say in 5th gear at that RPM, would be far, far less for a correspondingly higher (worse) BSFC.

TDIMeister's German-imported 1998 Audi A4 Avant TDI quattro

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