You might need a different cam to convert a D24 into a low RPM engine. Maybe VW sold these motors for some industrial or generator use that would have a cam you could get?
On my D24T, the cam is so 'high rpm' I rarely run the engine below 2500rpm as it seems prone to lug, and probably gets worse fuel economy. These are truly high RPM diesels, I've never had a gasoline car that I regularly revved as high as I do driving a D24.
It took me a few years to realize this after I got my first D24 (an 84 245). I had been driving slow with the fully loaded semi-trucks, but I eventually was keeping up with normal traffic once I started to rev the motor higher.
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'84 760 D24T/M46
'86 Isuzu Trooper Turbo Diesel
'01 VW Golf TDI
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