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Well - I have found the MB diesel "easter egg"
Some of you may know that an "easter egg" is something cool hidden in software (basically). Well I think I may have stumbled upon something that the MB engineers may have hidden in the MB diesel. I swapped out the rear end with a 300 SE. I can't believe the difference! Instead of running at 3K at 65 its just a hair over 2.5K, right at the edge of the turbo catching - absolutely perfect for cruising at 100 where before I was afraid of blowing the engine. Even the 160 MPH speedometer dropped right in without any recalibration (hard to believe). I know what you are thinking - damn that thing is slow off the line now - the funny thing is it seems like this is a whole new car - instead of shifting from second it will always start in first and run through the gears - once the turbo kicks in it will work any other 300SD on the road! (well, have only tried her against the roommates car). It seems this may have been the rear end that was originally designed for this car and they had to change at the last minute. I always knew something was a bit off. I have been working on these cars every day for a long time now and this is the best thing I have ever done to one. Why did they do this? Was this a US requirement or did they not want the diesel 5 model to be faster than the gas 6? Hmmm I would like to talk to these engineers….
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1983 Mercedes 300SD 1987 Mercedes 300SDL 2001 VW Passat 2.8 AWD 2007 OM642 Jeep WK 4x4 |
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What year model was the SE?
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Jim |
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I'm not sure - it could have been a 380 SE too. I bought the rear end awhile ago from a member on this site. One small note: This morning I got to try it out on some fresh snow - Didn't fare as well as the low rear end but once you are going its all good - probally be fine with some snow tires as I am running bald summer tires .... (car is getting ready for some major upgrades and restoration - photo is new interior)
I will try to get some shots of the rear end next time I have the car in the garage.
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1983 Mercedes 300SD 1987 Mercedes 300SDL 2001 VW Passat 2.8 AWD 2007 OM642 Jeep WK 4x4 |
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seats (excuse the dust )
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1983 Mercedes 300SD 1987 Mercedes 300SDL 2001 VW Passat 2.8 AWD 2007 OM642 Jeep WK 4x4 |
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Quote:
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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 |
#6
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Yes I am far too young to remember those times, this car happens to be the same age as me. It seems like the rear end they fitted to the car was not tuned at all, always starting in second gear and already in fourth by fifty or sixty. I think that may have been a quick fix for some government-supplied law, no? The SD was a US only car correct? They only had the 5 CYL turbo in the euro 123s? I have seen a couple 123 diesels that drove like this perhaps the SD was so de - tuned because of the US only status? I am just very surprised that with a simple gear change the car feels like it is finally in balance. Each gear shifts at the perfect point right back to ~2500 all the way up. Definitely hits the power band of this engine like I always thought it should be. As you can tell I am very excited, I was working on replacing the tired automatic with a five speed for this very reason, now I think a rebuild is all she needs….
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1983 Mercedes 300SD 1987 Mercedes 300SDL 2001 VW Passat 2.8 AWD 2007 OM642 Jeep WK 4x4 |
#7
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Quote:
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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 |
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hee i do remember those days. if you had a yankee plate you had better slow down to 55 or below when you hit the mason dixon line going south
it took soooo long to get to florida in the bug
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1984 300D Turbo - 231k....totalled 11/30/07 RIP |
#9
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I'm very interested in this. How difficult was the rear end swap? Was this a weekend job? Did you swap out the rear end housing or just the differential and assorted other gears?
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Fred Johnson 1977 240D 1983 300SD |
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How did you adjust the speedometer? How was the top speed affected? Has MPG changed much? Last question for now, what is the ratio of the SE gearing?
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Can you give us the final drive ratios of your old and new pumpkins?
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Never a dull moment at Berry Hill Farm. |
#12
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Cool!!!! I have a 380 SEL parts car and i would love to do this!! Do you really have to change out the spedo too or can you leave the factory one in?? Also what kind of fuel economy could you expect doing this?? 35mpg??
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2003 Ford Crew Cab 6.0 Powerstroke Diesel 6 spd 4x4(For Sale) 1981 MB 300SD 190,000 miles Gray with cream interior.(sold) 1981 MB 300SD 239,000 miles Cream with Brown interior.(sold) |
#13
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Me Too!! Me Too!!!
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'85 300SD 'Otto' new to us Sept. '07 '82 300SD 'Jurgen' (July '06 fan shaft broke, toasted rad, 3am in the morning 60km from home, walked 16km hitchhiking.... ) '70 SS Chevelle (finally back on my property, in the shop on stands) "The thinking required to solve a problem cannot be the same thinking used to create it!"-Einstien |
#14
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The 85 300D had a way taller rear gear as well, I've wanted to know what one felt like. I feel the 300D's are geared way too low as well. Though we don't have the second gear problem..
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One more Radar Lover gone... 1982 VW Caddy diesel 406K 1.9L AAZ 1994 E320 195K |
#15
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R107
--------- 380SL,SLC RATIO 1:2.47 380SL,SLC,560SL RATIO 1:2.47 ABS 450SL,SLC RATIO 1:2.65 450SL,SLC RATIO 1:3.06 W116 ---------- 280S,SE RATIO 1:3.69 300SD RATIO 1:3.07 450SE.SEL RATIO 1:3.06 450SE.SEL RATIO 1:2.65 W123 ---------- 230,240D RATIO 1:3.69 280E RATIO 1:3.58 300D RATIO 1:3.46 300DT 85 RATIO 1:2.88 300DT TO 84 RATIO 1:3.07 W126 ---------- 300SD 85 RATIO 1:2.88 ABS 300SD TO 85 RATIO 1:3.07 300SDL RATIO 1:2.88 ABS 300SE,SEL RATIO 1:3.46 380,500 RATIO 1:2.47 380,500,560SEL RATIO 1:2.47 ABS 420SEL RATIO 1:2.47 W124 ---------- 260E RATIO 1:3.27 300D 1987 RATIO 1:2.65 300E RATIO 1:3.07 Here ya' go fellas....Good reference, I suppose.
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1987 300SDL (324000) 1986 Porsche 951 (944 Turbo) (166000) 1978 Porsche 924 (99000) 1996 Nissan Pathfinder R50 (201000) |
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