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  #1  
Old 04-23-2008, 02:51 PM
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Fuel economy

What changes that anyone has done has kept at least the base performance on a 617 turbo but has made a noticeable improvement in fuel milage.

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  #2  
Old 04-23-2008, 02:55 PM
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change ip time to 28 degrees BTDC

drip method is best
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  #3  
Old 04-23-2008, 05:24 PM
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Do you want to try this on mine Mike?
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  #4  
Old 04-23-2008, 10:25 PM
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2.47 rear end, timing advance, no acceleration on the uphill, slooooow acceleration from stop, time stoplights so you roll through rather than stopping, never touch the brakes, coast whenever possible, make your idle low (like 600-650rpm). If you really wanna get good mileage, the #1 thing to do would be to improve aerodynamics of the car. Front air dam, side skirts, wheel covers, boat tail, underbody panels and fairings behind the rear tires. Also removing mirrors, improving the shape of the front of the car, and removing all exterior trim would help.. I have been really tempted to try all these things.
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  #5  
Old 04-24-2008, 08:44 AM
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What is this "timing 27°BTDC" and how do you do that????

thx
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  #6  
Old 04-24-2008, 11:50 AM
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I have noticed that turning the ALDA out seems to improve mileage. If you go too far you have smoke and mileage goes back down. Anyone else noticed this?
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  #7  
Old 04-24-2008, 03:26 PM
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Quote:
Originally Posted by Actros617 View Post
What is this "timing 27°BTDC" and how do you do that????

thx
Do a search for "drip method" or look in the DIY links under timing for a writeup on how to adjust the timing via the drip method. You will need to purchase or make a drip tool.

As for the ALDA, I have mine gutted (the housing is on as a dust cap but there are no parts inside of it) and I have noticed that if I stomp it from a stop, it will smoke a little bit, but if you go easy (and I mean eeeeeeeaaaassy) on the go pedal it will respond in kind. Removing the ALDA gives you direct control of the rack. Just keep this in mind when you are driving and you will be able to control fuel delivery how you want it, whether it be only a little fuel or a lot.
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  #8  
Old 04-24-2008, 10:57 PM
High River Alberta Canada
 
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300CD-
valves set very carefully,
bye bye EGR,
247 diff,
AAZ injectors @150 bar with 265 nozzles,
vogtland springs lowered it quite a bit & ought to reduce wind resistance some, alda 1 turn cc -no smoke except a very little when just starting from cold.
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  #9  
Old 04-25-2008, 03:23 PM
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Quote:
Originally Posted by miker300d View Post
What changes that anyone has done has kept at least the base performance on a 617 turbo but has made a noticeable improvement in fuel milage.
Although I have yet to complete the work, removal of the trap cat from 617.952 engines (California version of the '85 300D and SD cars) has been claimed on this forum as well as documented in M-B specs to improve both power and fuel economy.

A couple of horsepower and a couple of mpg are said to result from replacing the cat with a straight pipe for testing purposes only. I plan a long test, say 200,000 miles, to get good data.

Jeremy
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  #10  
Old 04-25-2008, 03:39 PM
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Originally Posted by Jeremy5848 View Post
I plan a long test, say 200,000 miles, to get good data.

Jeremy
LOL!!!
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  #11  
Old 04-25-2008, 07:01 PM
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On an SD a cherry bomb muffler helps a little. I have also replaced my turbo with one from an OM603 engine (not exactly a drop in replacement) which is of newer design and all indications are that this too is an improvement in mileage and power.
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  #12  
Old 04-25-2008, 11:11 PM
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Quote:
Originally Posted by Jeremy5848 View Post
Although I have yet to complete the work, removal of the trap cat from 617.952 engines (California version of the '85 300D and SD cars) has been claimed on this forum as well as documented in M-B specs to improve both power and fuel economy.

A couple of horsepower and a couple of mpg are said to result from replacing the cat with a straight pipe for testing purposes only. I plan a long test, say 200,000 miles, to get good data.

Jeremy
I don't think I've ever seen a catalytic converter on a diesel. Course I'm pretty new to diesels - this is only my second one, and both of them are OLD (84 & 86). Got a picture of it? Mine has a muffler-looking exhaust piece just ahead of the rear axle, but from what I've been told it is a resonator - not a catalytic converter....

And like Greasy Beast, I drive like a geezer and time lights to avoid stopping as much as possible. I also don't carry any extra weight (junk in the trunk), and I have blocked off my EGR too...

Last edited by rcounts; 04-25-2008 at 11:20 PM.
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  #13  
Old 04-28-2008, 12:03 PM
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So maybe I should be aware of what is "normal " city and highway mileage for these cars. I had a 80' sd that consistently got 26 in town and 29-31 on the freeway. No diesel since then has done that good.
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  #14  
Old 04-30-2008, 05:17 PM
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Trapped!

Quote:
Originally Posted by rcounts View Post
I don't think I've ever seen a catalytic converter on a diesel. Course I'm pretty new to diesels - this is only my second one, and both of them are OLD (84 & 86). Got a picture of it? Mine has a muffler-looking exhaust piece just ahead of the rear axle, but from what I've been told it is a resonator - not a catalytic converter.....
It is not a true catalytic converter but rather a soot trap that collects soot when the engine is cold and tending to be a little smoky. When the engine and everything around it heats up, the soot is supposed to burn off. It was installed in the 617 engines for the 300D and SD 1985 California cars only. At first Mercedes used a "trap oxidizer" that was replaced every 30,000 miles on warranty; in the early 90s they changed to a "trap catalyst" that was a one-time replacement.

The trap was installed between the exhaust manifold and the turbocharger. (See the attached pictures.) Many people replace the entire manifold assembly to get rid of the trap; I have chosen another route.

Jeremy
Attached Thumbnails
Fuel economy-engine-bay.jpg   Fuel economy-pieces.jpg  
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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
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  #15  
Old 04-30-2008, 05:32 PM
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300CD as well.

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