Tested my '82 CD today - leveled off at 40 in S, shifted to D and put the hammer down but it held 3rd until close to 55, without the pedal all the way down. Somewhere between 13 and 14 seconds. If 7 secs. is possible I have more tuning to do than I thought!

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'82 300CD
"Pearl", the very first turbo diesel 123 coupe
Totaled 11/23/18, rebuild in progress.
'85 300TD, "Artemis".
'78 300D euro, "Ol' Red", mostly retired.
'85 300D, "Gandalf".