Quote:
Originally Posted by MechEngVT
Since I can't locate a BSFC chart for the 1.6 TD in an amount of time I'm willing to devote to the search I can't see whether there are plausible scenarios to indicate which would be more fuel efficient in a given application. Generally engines of this size in a compact vehicle application cannot be forced to operate at a high enough load to achieve the exact operating point required to deliver peak BSFC in a cruise scenario. Put the engine in a full size truck however and you just might hit that point.
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VW has enough in the way of gearing and wheel sizes that either can be geared to be at peak BTE at a cruise. Also, the VNT and change to DI allow for a relatively broad, in terms of 300-200g/kWh BSFC map so even w/o the change in gearing a 1.9 TDI would probably be as efficient as a 1.6 TD. That said, gearing options definitely vary by engine type so having a nice range of gearing options in terms of efficiency doesn't always hold true.