I also want to add that my 1980 W116 300SD has a lot of low-end power. I can actually chirp the tires and lay down rubber for about a second if I romp on it. I also don't see any smoke out the back.

The 1968 W110 200D was rather peppy on the low-end, too. It would throw me back in my seat and maybe even chirp a tire on the odd occasion. If I floored it and was fast on the shifts, jumping out in to fast-moving traffic wasn't a concern.

But, the 1991 W126 350SDL is fairly sluggish from a stop and smokes quite a bit until the turbo spools up. But even then it doesn't seem very fast and if you give it too much throttle it smokes black. I am wondering if maybe the mixture adjustment on the injection pump is too rich because it would seem to reason that this should be the fastest of the three cars as it has the biggest engine with the most horsepower?

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1967 W110 Universal Wagon, Euro, Turbo Diesel, Tail Fins, 4 Speed Manual Column Shift, A/C
1980 W116 300SD Turbo Diesel, DB479 Walnut Brown, Sunroof, Highly Optioned, 350,000+ Miles