Mav:

If your performance didn't change, put the ALDA back where it was. All you will do is burn more fuel if it is set too high, there is no other performance change, rumor aside.

12-13 sec is a bit slow, but not by much -- factory spec for the E300D is 10.7 with trap oxidizer, a little less with the catalyst, I would expect a couple seconds longer for the W140, as it is heavier, in spite of the extra engine size. A new chain may help -- if the old one is stretched, the injection timing is late.

Timing chain is the same on this car as any other with a ratcheting tensioner -- take the tensioner out and reset it (I don't know the details yet, haven't checked mine), then grind the pins down on a link of the chain, press them out to break the chain, attach the new chain with a temporary link, turn engine over by hand to draw chain through whilst holding tension on both ends, then wrap chain over cam and install permanent link by swaging the pins down. Not difficult as long as you never let tension off the chain. Huge pain in the ass if you drop it!

Peter

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1972 220D ?? miles
1988 300E 200,012
1987 300D Turbo killed 9/25/07, 275,000 miles
1985 Volvo 740 GLE Turobodiesel 218,000
1972 280 SE 4.5 165, 000 - It runs!