Mine is the same as the pics show here with a 2.88 ratio.

ideal highway cruising rpms for a 300d?



.

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1983 123.133 California
- GreaseCar Veg System

I think Im doing 75mph at 3k rpm on my 1990 300d. Currenlt running GT 205/55R16's on 8 holes. Looks good !

This should answer the question.

Attached Thumbnails

 

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Rick Miley
2014 Tesla Model S
2018 Tesla Model 3
2017 Nissan LEAF
Former MB: 99 E300, 86 190E 2.3, 87 300E, 80 240D, 82 204D Euro
Chain Elongation References

3000@70 / 3200@75 / 1981 300SD

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Mine: 1987 MB 420 SEL - 62K (Dec 2019)
Mine:1991 MB 350SDL - 244K (Aug 2011)- Totalled 9/14/2016
Mine:1981 MB 300SD - 326K mi (July 1997)-sold
Wife's: 2008 MB C300 Sport - 92K mi (April 2009)

a 10mpg variance in the speedo seems extreme. Do we have larger rims/tires?

I painted my speedo so there is more weight on it so getting to the 12 position on the speedo it drags and then shows faster as I get to 1 and 2 oclock. at 65 its right on.

hmmmm

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77' 300D, "Cartman" SOLD @ 150K (didn't know what I had)
83' 300SD, "The Superdon" 325k+ @ 28mpg
95 E320 wagon, "Millennium Falcon" 231k+ @ 24 Mpg
95 E300D, "Sherley" 308k @ 33.69 Mpg, currently anticipating a head
99 Suzuki Intruder "Trudy" @ 45 mpg

I do about 3100 RPMs at 70 mph. I've got a 307 diff in the rear.

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[/SIGPIC]~cirrusman

1983 Mercedes Benz 300SD - Wife calls him "Chitty Chitty Bang Bang"
[SIGPIC]




1983 Toyota Tercel (Tommy, The little Toyota that could)
1965 Ford F100 (Grandma Ford)
2005 Toyota Sienna (Elsa, Wife's ride)


Gone:
1988 Toyota Pickup
2004 Subaru Outback

1987 Cadillac Fleetwood Brougham
1986 Volvo 740 GL Station Wagon - Piece of junk.
1981 Volvo 242 DL 2 Door - Hated to see it go. R.I.P.
1987 Pontiac Fiero GT

'87 300D Turbo 5spd 2200rpm@75, 2000rpm@65. Didn't do a 70 run but maybe it's 2100rpm. This is in 5th

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08 R320 CDI current

Past
95 E420
87 300D Turbo 5spd
90 300TE
83 300SD
85 300TD
92 400E
85 190D

1978 300SD with 205/70/14 tires and stock 3.07:1 axle = 67 mph @ 3,000 RPM....

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Did you just pass my 740 at 200 kmh in a 300SD?????

1978 300SD 'Phil' - 1,315,853 Miles And Counting - 1, 317,885 as of 12/27/2012 - 1,333,000 as of 05/10/2013, 1,337,850 as of July 15, 2013, 1,339,000 as of August 13, 2013



100,000 miles since June 2005 Overhaul - Sold January 25th, 2014 After 1,344,246 Miles & 20 Years of Ownership

If anyone thinks to use the tachometer to check or substitute for the speedometer.

Don"t...

Slipping/excess wear of the transmission clutch disc's and/or brake bands = a huge potential variable rpm versus speed range.

Bad trans = overheating engine
http://www.peachparts.com/shopforum/general-information/

'87 300TD: 2700RPM@70mph

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Gone to the dark side

- Jeff