Fastest 0-60 from STOCK diesel? (pre-1990) - PeachParts Mercedes-Benz Forum

derherr65 · #1 04-13-2007, 01:00 PM

What pre-1990 Mercedes diesel has the fastest 0-60?

pawoSD · #2 04-13-2007, 01:10 PM

1987 300D Turbo with the 6cyl 603 engine.

Brian Carlton · #3 04-13-2007, 01:23 PM

Concur

derherr65 · #4 04-13-2007, 01:57 PM

I know an '82 300CD hits 60 in about 15 seconds. How fast is the '87 300sd?

Brian Carlton · #5 04-13-2007, 02:00 PM

Quote:

Originally Posted by derherr65

I know an '82 300CD hits 60 in about 15 seconds. How fast is the '87 300sd?

There was no SD in '87. The vehicle with the speed is the W124 body......300D.......and it will do a 0-60 run in 10.5 seconds (sometimes less).

My '86 with the same engine can just nip the 11 second mark.

derherr65 · #6 04-13-2007, 02:08 PM

Ah, ok. Thanks. With only 20 more HP why are they so much faster than a w123 300d?

#7 04-13-2007, 02:14 PM

What about the 190D w/ the turbo? Available 1 yr only, as I recollect.

The 123 was only avail w/ the 617 turbodiesel, not the 603. Plus, I believe the 123 is a heavier car, though I could be wrong.

Brian Carlton · #8 04-13-2007, 02:15 PM

Quote:

Originally Posted by derherr65

Ah, ok. Thanks. With only 20 more HP why are they so much faster than a w123 300d?

A good running 300D should be in the 13.5 range. My SD runs 12.7. The W124 has a much more streamlined body and it's weight is about 150 lb. less than the W123. The additional 25 hp represents an increase of 25% over the 617. So, all else being equal, the ET's are going to drop proportionally.

derburger · #9 04-13-2007, 03:26 PM

My nonturbo 300cd runs 0-60 in 22 seconds. It needs some new filters, diesel purge and an italian tuneup among other things...

derherr65 · #10 04-13-2007, 03:27 PM

You're right, if a OM617 300D can do 0-60 in 13.5 seconds. Mine does about 15 seconds, even with increased boost. The fastest OM617 300d I know of is only down to 14 seconds at best, and highly modified at that.

Pulling out the good old F=MA rule...
OM617 300D 2937N=3500lbs(1587Kg)x60mph/14.5sec(1.85m/s/s)
OM603 300D 3873N=3350lbs(1519Kg)x60mph/10.5sec(2.55m/s/s)

That's a 32% increase in apparent power. 123HP to 147HP is only a 20% increase. There must be a significant increase in low end torque, much earlier turbo spool up, or something to account for that. That or one of our numbers is wrong. Curb weights are notoriously inaccurate, and who knows how conservative Mercedes is with it's power figures.

Brian Carlton · #11 04-13-2007, 03:33 PM

Quote:

Originally Posted by derherr65

You're right, if a OM617 300D can do 0-60 in 13.5 seconds. Mine does about 15 seconds, even with increased boost. The fastest OM617 300d I know of is only down to 14 seconds at best, and highly modified at that.

Pulling out the good old F=MA rule...
OM617 300D 2937N=3500lbs(1587Kg)x60mph/14.5sec(1.85m/s/s)
OM603 300D 3873N=3350lbs(1519Kg)x60mph/10.5sec(2.55m/s/s)

That's a 32% increase in apparent power. 123HP to 147HP is only a 20% increase. There must be a significant increase in low end torque, much earlier turbo spool up, or something to account for that. That or one of our numbers is wrong. Curb weights are notoriously inaccurate, and who knows how conservative Mercedes is with it's power figures.

I think the error here is the use of 14.5 seconds for the W123. I believe that there are vehicles on the forum that can get down to the 13.5 range, but, my figure is based upon the SD. My SD is at 12.7 and it's not the fastest on here (it's got a 2.88 diff). So, I'm extrapolating that a very good running W123 should achieve 13.5 seconds with a 3.07 diff.

If it cannot achieve 13.5 seconds, then the body is severely hindering the performance and the W124 would have a serious benefit in wind resistance.

That would be the reason why the numbers are so discrepant.

derherr65 · #12 04-13-2007, 03:37 PM

I hear the 124 gets better mileage due to lower wind resistance. Just surprised that is has that much effect in a 0-60.

truckinik · #13 04-13-2007, 03:37 PM

Well, I know my older, non turbo 300CD's, are slower than molasses, off the line, and only marginal in the top speed department. The Turbo cars, do only a little better, but still basically can't get out of their own way. I know they weigh a lot, and have very few horses to move them. I never timed anything, or cared to though.