Quote:
Originally Posted by lovemysan
Could I conclude from the add below that mileage is equal/superior to the average TDI?
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No. This is a PD (pumpe-duse, or pump-injector) engine which is not (yet) average. The majority of the TDI in the states are still the VE or rotary distributor pump type used since the Rabbit diesel of the early 80's (although not TDI until 1996). The PD has some advantages, namely that it avoided some patent and licensing issues, but now even VW are going to the common rail type of injection system on the 2008 models. The PD is not known in TDI circles as being economical with fuel. A VE pump TDI with chip tuning will have equal power and still superior fuel mileage. The result is that the PD won't be 'average' to the US TDI before the number of CR systems overtake the attrition of the VE pumps.
BTW, The PD system is extremely sensitive to fuel viscosity. B100 biodiesel use in these is still being debated as to whether or not the thicker fuel will accelerate wear on the nearly intolerably high fuel system pressures.
The debate on the biodiesel and the VE pumps is settled: No problems.