top speed for a 1985 300d - Page 2 - PeachParts Mercedes-Benz Forum

vstech · #16 03-20-2012, 09:32 AM

Quote:

Originally Posted by t walgamuth

I am trying to estimate the fuel economy possible with my five speed od tranny in my 85 300sd. I am getting 35 consistently with my 123 300d euro na motor running 307 diff and the 18% od tranny.

If the 126 has less drag, and it appears maybe to have, with the 288 gears and the od I should be able to get high thirties highway.

... this sounds like a recipe for clutch burn...

the 126 is a slippery sedan, if you plan on hypermiling it, I'm sure that can be reduced more. the addition of some underbody panels, and smoothing some lines out, should get you to 40 or higher. tires, skirts, dams, getting that windshield curtain trimmed would help some as well...

t walgamuth · #17 03-20-2012, 10:16 AM

Quote:

Originally Posted by vstech

... this sounds like a recipe for clutch burn...

the 126 is a slippery sedan, if you plan on hypermiling it, I'm sure that can be reduced more. the addition of some underbody panels, and smoothing some lines out, should get you to 40 or higher. tires, skirts, dams, getting that windshield curtain trimmed would help some as well...

Yeah, the 123 with the 307 works really well, but the 300 is heavier and has a slightly taller diff. I can do it though and most likely I will be about the only one driving it.