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  #16  
Old 05-05-2009, 07:49 PM
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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
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  #17  
Old 05-05-2009, 07:55 PM
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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

2 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.
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  #18  
Old 05-05-2009, 08:46 PM
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Quote:
Originally Posted by ah-kay View Post
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.
You could also remove all the glass to reduce the weight and wind resistance caused by them.
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  #19  
Old 05-06-2009, 08:00 PM
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Quote:
Originally Posted by Icefire View Post
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.
What kind of rpms will by car be running at with the different diff, on the highway?
I'm guessing around town changing the diff will make little difference?
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  #20  
Old 05-06-2009, 08:21 PM
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It will help around town too.
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..I also have a 427 Cobra replica with an aluminum chassis.
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  #21  
Old 05-06-2009, 11:28 PM
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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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  #22  
Old 05-06-2009, 11:58 PM
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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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  #23  
Old 05-07-2009, 12:35 AM
ForcedInduction
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Originally Posted by bart_dood View Post
What about bypassing the EGR valve?
That should have been the first thing you did to the car.
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  #24  
Old 05-07-2009, 12:58 AM
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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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  #25  
Old 05-07-2009, 09:30 AM
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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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  #26  
Old 05-07-2009, 09:35 AM
ForcedInduction
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Originally Posted by Oldwolf View Post
I went ahead and filled up and calculated 37.8 mpg.
...
Overall I was pleasently surprised.
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  
Old 05-07-2009, 09:39 AM
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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

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  #28  
Old 05-07-2009, 10:39 AM
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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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1972 W108 280SE 3.5 (sold but not forgotten)
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  #29  
Old 05-07-2009, 11:15 AM
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Quote:
Originally Posted by Fuzzball View Post
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???
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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'89 420SEL 166k - mine (OC-167,000)
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  #30  
Old 05-07-2009, 02:35 PM
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Quote:
Originally Posted by bart_dood View Post
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?
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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