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#1
07-22-2011, 01:36 PM
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1985 "sweet spot"?
I happened to be reading an old thread on peoples' preferences for the w123-w126 era turbodiesels and one poster mentioned that the '85 OM617 has a "sweet spot".
I know my '85 300d has electronic EGR and a different cam (and is connected to a different final drive ratio) but this is the first I've seen a reference to a sweet spot. Can someone elaborate?
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 Mac 2002 e320 4matic estate│1985 300d│1980 300td Previous: 1979 & 1982 & 1983 300sd │ 1982 240d “Let's take a drive into the middle of nowhere with a packet of Marlboro lights and talk about our lives.” ― Joseph Heller, Catch-22 
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#2
07-22-2011, 01:51 PM
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Essentially that point where the car runs smooth as silk...its in the right spot for maximum drive-ability, gets great mileage, and its able to accelerate without waiting for the turbo to spool up.
IMHO thats about 65-80 mph. Mines an 83 but has an '85 2.88 rear differential, but its more about rpms than actual speed. With the 3.07 gears that shifts downward about 5 mph.
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Proud owner of .... 1971 280SE W108 1979 300SD W116 1983 300D W123 1975 Ironhead Sportster chopper 1987 GMC 3/4 ton 4X4 Diesel 1989 Honda Civic (Heavily modified) --------------------- Section 609 MVAC Certified --------------------- "He who fights with monsters might take care lest he thereby become a monster. And if you gaze for long into an abyss, the abyss gazes also into you." - Friedrich Nietzsche
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#3
07-22-2011, 02:00 PM
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85's got better seatbelts, and carry over the better gear ratios and stall speed from 84.
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#4
07-22-2011, 02:24 PM
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Not all '85s have the active-restraint seat belts. Mine for instance, does not. And it's not that mine were swapped out or something. It doesn't have the wiring or control box below the ashtray for them...
But Puff's sweet spot is around 80. Feels so nice at that speed.
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'85 300TD "Puff The Magic Wagon" - Rolling Resto '19 Mazda CX-9 Signature - Wife's sled '21 Morgan 3-Wheeler P101 Edition '95 E300d - SOLD '84 300TD "Brown Betty" - Miss this one '81 240D "China Baby" - Farm grocery getter
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#5
07-22-2011, 02:40 PM
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Belts
Hmmm I was wondering what a previous poster meant about the belts.
Mine doesn't have active belts either... the only difference between them and my '80 is that the '85 belts are a tad shorter, from what I can tell.
__________________
Mac 2002 e320 4matic estate│1985 300d│1980 300td Previous: 1979 & 1982 & 1983 300sd │ 1982 240d “Let's take a drive into the middle of nowhere with a packet of Marlboro lights and talk about our lives.” ― Joseph Heller, Catch-22
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#6
07-22-2011, 02:49 PM
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Hmm I thought that the pretensioned belts were standard for 85. Every 85 I had seen has them, they say RS on the buckle.
-J
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1991 350SDL. 230,000 miles (new motor @ 150,000). Blown head gasket  Tesla Model 3. 205,000 miles. Been to 48 states! Past: A fleet of VW TDIs.... including a V10,a Dieselgate Passat, and 2 ECOdiesels. 2014 Cadillac ELR 2013 Fiat 500E.
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#7
07-22-2011, 08:31 PM
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Yep. Not all have them.
And you can't just swap 'em in. You have to have the control unit. I kind of prefer not to have them. I can only imagine how much they cost to replace. And since this was first gen technology, probably not worth the trouble. I could be wrong. If it's one thing Mercedes almost always gets right, it's safety.
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'85 300TD "Puff The Magic Wagon" - Rolling Resto '19 Mazda CX-9 Signature - Wife's sled '21 Morgan 3-Wheeler P101 Edition '95 E300d - SOLD '84 300TD "Brown Betty" - Miss this one '81 240D "China Baby" - Farm grocery getter
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#8
07-23-2011, 12:28 AM
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How can I tell if my 1985 has this system?
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1985 300TD Turbo Euro-wagon 1979 280CE 225,200 miles 1985 300D Turbo 264,000 miles 1976 240D 190,000 miles 1979 300TD 220,000 GONE but not forgotten 1976 300D 195,300 miles 1983 300D Turbo 175,000 miles http://i42.photobucket.com/albums/e3...e485-1-2-1.jpg
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#9
07-23-2011, 12:49 AM
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It says RS on the seat belt buckles.
__________________
1991 350SDL. 230,000 miles (new motor @ 150,000). Blown head gasket Tesla Model 3. 205,000 miles. Been to 48 states! Past: A fleet of VW TDIs.... including a V10,a Dieselgate Passat, and 2 ECOdiesels. 2014 Cadillac ELR 2013 Fiat 500E.
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#10
07-23-2011, 12:52 AM
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oh i saw that posted earlier in this thread after i had posted. Sorry about that, i missed it the first time around.
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1985 300TD Turbo Euro-wagon 1979 280CE 225,200 miles 1985 300D Turbo 264,000 miles 1976 240D 190,000 miles 1979 300TD 220,000 GONE but not forgotten 1976 300D 195,300 miles 1983 300D Turbo 175,000 miles http://i42.photobucket.com/albums/e3...e485-1-2-1.jpg
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#11
07-23-2011, 12:56 AM
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No worries. If yours has it take a picture, I just tried to find one and couldn't.
-J
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#12
07-23-2011, 01:01 AM
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will do, i'll check in the morning. I know the front seat belt buckles say something on them, but i dont remember what...
__________________
1985 300TD Turbo Euro-wagon 1979 280CE 225,200 miles 1985 300D Turbo 264,000 miles 1976 240D 190,000 miles 1979 300TD 220,000 GONE but not forgotten 1976 300D 195,300 miles 1983 300D Turbo 175,000 miles http://i42.photobucket.com/albums/e3...e485-1-2-1.jpg
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#13
07-23-2011, 08:08 PM
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Yupp! My front seat belt buckles have RS on them.
__________________
1985 300TD Turbo Euro-wagon 1979 280CE 225,200 miles 1985 300D Turbo 264,000 miles 1976 240D 190,000 miles 1979 300TD 220,000 GONE but not forgotten 1976 300D 195,300 miles 1983 300D Turbo 175,000 miles http://i42.photobucket.com/albums/e3...e485-1-2-1.jpg
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