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Old 07-04-2008, 03:42 AM
yoterbenz's Avatar
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Join Date: Dec 2007
Location: Auburn, Washington
Posts: 60
New MPG numbers

In this day and age with diesel being so expensive it's imperative to squeeze as many miles per gallon possible. I decided to do a few modifications to increase my fuel efficiency and INOP it was totally worth it. These are the mods I have done to date....

1. Fitch Fuel Catalyst
2. Flex-a-Lite Syclone 14" fan w/ VSC speed controller
3. K&N air filter
4. Bosio nozzles installed and pop tested

I recently took a highway trip and yielded 36 MPG. The biggest difference was the installation of the Bosio nozzles, but the other mods have helped. My car runs great and in my opinion the money spent was well worth it.

1977 Mercedes 240D... 4 speed manual... soon to be host to a lot of mods..

1984 Toyota 4x4.. Weber 32/36 DGEV carb, Offenhauser Dual Port intake manifold, TRD cam, MSD 6A ignition, MSD 8.5 wires, MSD Blaster coil, NWOR Tri-Y header, cat-back exhaust, NHK 3" lift springs, Black Magic electric fan, LC Engineering crank pulley,traction bars, LockRight locker, oil cooler, manual water temp gauge, oil temp gauge, vacuum gauge, and 394,000 miles on the clock with one motor change.
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Old 07-04-2008, 04:35 AM
Posts: n/a
The first two do little to help MPG, the K&N filter does nothing but pass dirt, the 4th is way past due maintenance on most every MB diesel. It looks like you got everything running closer to what it should be.

A better change to raise MPG would be to swap that 3.69 rear end for a 3.46 ratio. Advance the timing to 26-28*BTDC and get the cam back in time with the crank. Swap in the larger turbodiesel radiator and your electric fan will come on even less.
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Old 07-04-2008, 04:53 AM
turbobenz's Avatar
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Join Date: Nov 2007
Location: Cameron Park CA
Posts: 1,863
larger turbodiesel radiator?

As for gas mileage on my sd I removed the condenser, ac compressor, and receiver dryer when I did the motor swap to save weight and increase cooling efficiency. If your trying to get that fan to run less I suggest you remove the condenser if you don't use it.
1981 300SD 512k OM603

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Old 07-04-2008, 06:27 AM
Posts: n/a
Originally Posted by turbobenz View Post
larger turbodiesel radiator?
Yes. Its wider, thicker and has many more core tubes spaced closer together.
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Old 07-04-2008, 06:44 AM
Down South GA Boy
Join Date: Apr 2008
Location: Atlanta GA
Posts: 116
is that the radiator that has a separate pressure tank with the cap off on the side and not on top of the radiator. if so I changed from the cap on radiator to the thicker and slightly more narrow one with the expansion tank and it makes quite a bit of difference in cooling.
'81 300D - swapped to a 617.951 turbo motor with a 150 amp alt.
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Old 07-04-2008, 07:31 AM
t walgamuth's Avatar
Join Date: Apr 2005
Location: Lafayette Indiana
Posts: 35,266

Its not something I would do on a stock 240d though. They run so cool that the fan probably seldom runs anyway. If you are going very fast the forward movement of the car will probably to all the cooling needed.

If you do a lot of town driving it might be worthwhile, but otherwise I probably wouldnt do it unless the rad needed changing anyway.

Tom W
[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.
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Old 07-04-2008, 01:20 PM
Palangi's Avatar
L' Résistance
Join Date: Dec 2000
Location: Republique de Banana
Posts: 3,496
Both of my 123 diesels gained about 2 mpg by switching tire brands. Both had Bridgestone before, I forget the exact model number. The Bridgestones gave kind of a hard ride, and eventually developed some funny wear patterns that rotating wouldn't fix. Switched to Michelin Harmony's. MPG went up immediately, plus the ride is better. The 300D now has about 55k on the Michelins and will need new ones in a year or so. MPG has gradually increased by about another 2 MPG on the 300D. It finally dawned on me that it might be due to the tread wear (less rolling resistance). I bet the MPG goes down by a couple MPG when it gets new Tires with full tread depth.

2004 C240 Wagon 203.261 Baby Benz
2008 ML320 CDI Highway Cruiser
2006 Toyota Prius, Saving the Planet @ 48 mpg
2000 F-150, Destroying the Planet @ 20 mpg

0BAMA .......... OUTHOUSE
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Old 07-04-2008, 02:49 PM
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Join Date: May 2008
Location: Arizona
Posts: 189
Keep the K&N filter well oiled and you should be fine. I also run a K&N, but mine has a outer foam element that wraps the K&N to help keep it saturated! They don't nearly pass the dirt claimed unless neglected.

Save and enlarge for explanation of financial crisis! Advice on cell phone signal antennas and amplifiers.
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