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#16
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Hmm, I've consistently gotten over 30 MPG with my sdc. You should change your diff ratio to 2.47 or if you want to go crazy 2.24. make sure your brakes arent dragging, and all your bearings are good.
Use a lighter wheel like a CLK lighter wheel = lower unsprung weight.
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1984 Euro 300SDC, (4spd standard) 1986 Toyota Landcruiser Diesel HJ60 5spd X2 Gone but not forgotten (some sold, some stripped) 1983 300 SD, 1985 300 SD, 1983 240D, 1986 300 SDL, 1985 300 SDL, 1983 300 D, 1984 300 D, 1985 300SD, 1987 300 SDL, 1983 300 SD, 1985 300 TD Euro, 1983 380SEC, 1990 300 D, 1987 300D, 1982 300D, 1982 300D, 1994 E420, 1987 300 TD, 1987 300 D, 1984 300 D |
#17
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If all things failed. How about trying this?
Remove all dead weights - passenger seat, back seat, spare tire, jack, side mirrors or others. Duck tape all seams.
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Not MBZ nor A/C trained professional but a die-hard DIY and green engineer. Use the info at your own peril. Picked up 2 Infractions because of disagreements. NOW reversed. W124 Keyless remote, PM for details. http://www.peachparts.com/shopforum/mercedes-used-parts-sale-wanted/334620-fs-w124-chasis-keyless-remote-%2450-shipped.html 1 X 2006 CDI 1 x 87 300SDL 1 x 87 300D 1 x 87 300TDT wagon 1 x 83 300D 1 x 84 190D ( 5 sp ) - All R134 converted + keyless entry. |
#18
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You could also remove all the glass to reduce the weight and wind resistance caused by them.
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DJ 84 300D Turbodiesel 190K with 4 speed manual sold in 03/2012 |
#19
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Quote:
I'm guessing around town changing the diff will make little difference?
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Current Rides: 2004 BMW R1150GS Adventure 2005 MB W211 E320 Cdi |
#20
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It will help around town too.
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[SIGPIC] Diesel loving autocrossing grandpa Architect. 08 Dodge 3/4 ton with Cummins & six speed; I have had about 35 benzes. I have a 39 Studebaker Coupe Express pickup in which I have had installed a 617 turbo and a five speed manual.[SIGPIC] ..I also have a 427 Cobra replica with an aluminum chassis. |
#21
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What about bypassing the EGR valve so my engine isn't sucking in its own poop? Although I am very knowledgable regarding gas engines, I am struggling to comprehend whether hot exhaust gas in the intake would make any difference to economy or not?
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Current Rides: 2004 BMW R1150GS Adventure 2005 MB W211 E320 Cdi |
#22
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I wish I would of replaced my injector when I bought my car. It idles better after changing them and mileage is up consistently over 2 mpg.
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85 300D Turbo |
#23
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That should have been the first thing you did to the car.
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#24
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Absolutely remove or defeat the EGR function and then clean up the intake manifold. After that and the other suggestions already made, remove or defeat your right foot, as it has the biggest effect on fuel economy. I can move my 87's mileage up and down several mpg just by minor adjustments in my driving style.
There are also changes that you may not be able to make, such as driving at off-peak hours to avoid sitting in traffic. Even though diesels are very economical at idle, they still consume fuel. The "stop-light grand prix" is a real fuel waster. Other nit-picks: don't keep the ski rack on the car if you're not using it. The drag from a rack can cost you a mile per gallon or more. Keep the windows closed (not removed), especially at highway speeds, to reduce turbulence/drag. If your car came with belly pans, make sure you still have all of them; keep them on the car tightly, not waving in the breeze under the car with half the screws missing. (My '96 came with two belly pans and I thought it was complete; only later did I discover there was a third, immediately behind the front bumper.) Jeremy
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"Buster" in the '95 Our all-Diesel family 1996 E300D (W210) . .338,000 miles Wife's car 2005 E320 CDI . . 113,000 miles My car Santa Rosa population 176,762 (2022) Total. . . . . . . . . . . . 627,762 "Oh lord won't you buy me a Mercedes Benz." -- Janis Joplin, October 1, 1970 |
#25
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I've had my 300D for 2 weeks now. Last night when coming home from work I was worried the fuel gauge was not working correctly because it was dropping too slowly. I went ahead and filled up and calculated 37.8 mpg. I drive pretty easily so that probably helps my mileage.
Overall I was pleasently surprised.
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1993 W124 300D 2.5L Turbo, OM602.962 2000 Chevrolet Cavalier, 2.4L DOHC 2002 Ford Explorer, 4.0L SOHC 2005 Toyota Prius, 1.5L http://www.fuelly.com/sig-us/40601.png |
#26
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Don't be, that figure is not possible unless you were driving 35mph down the highway. There is an error somewhere, your math, expansion of the fuel (heat), odometer incorrect, wrong size tires, etc etc etc.
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#27
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Could be. I keep a journal on all my cars and record fuel purchase, mpg etc. I'll keep up my books and see how my 300D does over time.
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1993 W124 300D 2.5L Turbo, OM602.962 2000 Chevrolet Cavalier, 2.4L DOHC 2002 Ford Explorer, 4.0L SOHC 2005 Toyota Prius, 1.5L http://www.fuelly.com/sig-us/40601.png |
#28
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I'm getting absolutely terrible mileage in my 300D....I've driven 39.9 miles in the two years I've had it, and probably put at least 5000 gallons into the tank.....
Maybe I should go ahead and do that Odometer fix???
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1998 W202 C230 - The money pit of late. 1984 W126 300SD (356,800 miles) Gone to the wrenchapart 1984 W123 300D Gone to the wrenchapart 1972 W108 280SE 3.5 (sold but not forgotten) 1986 Buick Grand National 3.8l Turbo (86k miles) 1966 Glassic Model 'A' Replica http://www.glassicannex.org http://banners.wunderground.com/weat...Round_Rock.gif |
#29
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You must do a LOT of driving!!! 5,000 gallons at 22mpg is over 110,000 miles.....in 2 years.....55k a year.
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-diesel is not just a fuel, its a way of life- '15 GLK250 Bluetec 118k - mine - (OC-123,800) '17 Metris(VITO!) - 37k - wifes (OC-41k) '09 Sprinter 3500 Winnebago View - 62k (OC - 67k) '13 ML350 Bluetec - 95k - dad's (OC-98k) '01 SL500 - 103k(km) - dad's (OC-110,000km) '16 E400 4matic Sedan - 148k - Brothers (OC-155k) |
#30
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I'm curious about this as well. I imagine the EGR will have some effect on fuel economy, but I'd love to know how much. Perhaps after I rebuild my injectors I'll do a test. On the '87, the EGR doesn't function at highway speed, so the effect will only be in city driving. I've left my EGR intact because I'd like to keep my environmental footprint small, and the difference in performance isn't important enough to me. If the fuel economy were significantly different I might reconsider... trading less CO2 against more NOx.
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1987 W201 190D |
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