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  #61  
Old 09-12-2017, 07:52 PM
Diseasel300's Avatar
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And because I felt like it, I ran fuel economy data after the tuning I did this past Friday. When I fill the tank for fuel economy data, I fill it all the way up into the filler neck so there's no question the tank is full.

This time around I did 76.0 miles (actually clicked over as I parked at the gas station!) on 2.862 gallons of diesel. That comes out to 26.55mpg, 100% stop/go "city" traffic with A/C running. Unlike the previous time, I drove like a normal person without romping on the skinny pedal.

I think my tuning is complete! Plenty of power without any smoke, and now very good fuel economy. My Honda does ~22mpg for the same driving for comparison. And it's A/C isn't as cold!

Just goes to show that yes, the 3.5L injection pump CAN be used in a 3.0L engine, but needs to be tuned for best results.
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  #62  
Old 09-16-2017, 09:55 PM
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To rule out a fluke fuel economy reading, I've run it again. 79.4 miles on 3.122 gallons of fuel. Gives 25.43mpg so it wasn't a fluke. I haven't been as nice to the throttle pedal this time around, so I'm fine with a deviation of ~1mpg. I'm just happy to see the fuel economy improved to where it should be without any smoke!
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'86 300SDL - "The Diseasel" 177K
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'11 Honda Accord EX - "The Daily" 60K and counting...
The Diseasel Thread - Everything You Didn't Know You Wanted To Know
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  #63  
Old 09-18-2017, 10:22 AM
WTB: 94/95 E320 Wagon
 
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You've got me beat in my 124 wagon. I'm getting around 22 mpg with city traffic, AC on.
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'87 124.193 (300TD) "White Whale", ~380k miles, 3.5l IP fitted
'95 124.131 (E300) "Sapphire", 379k miles
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  #64  
Old 09-18-2017, 11:06 AM
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It's all down to the tuning and how much you abuse the throttle pedal. If you're nice to it, you'll get good economy, if you're mean to it, expect less economy. That said, before tuning, I was doing 16-18mpg in town when being careful with the A/C on. It was pretty obvious something wasn't right, the diluted oil was another big clue...

Since the tuning, not only has the economy improved, but the oil consumption is down far enough that I can't measure it, the oil dilution is gone, overheating on hills on the interstate is gone, black smoke is gone, and the power doesn't seem to be any different other than being much smoother in delivery due to a working ALDA.

If your wagon is still fitted with the 3.5L pump, it's worth trying to fiddle with the fueling settings. I didn't lose any power, but gained some very measurable economy and a much more refined car to drive.
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'86 300SDL - "The Diseasel" 177K
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'11 Honda Accord EX - "The Daily" 60K and counting...
The Diseasel Thread - Everything You Didn't Know You Wanted To Know
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  #65  
Old 09-22-2017, 09:53 PM
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With all the fuel economy watching I've been doing since tuning the injection pump, I learned that my odometer wasn't reliable once it got above 100 miles on the trip, or when running at highway speeds. It turns out the stepper motor (W126 odometers are electronic) was sloppy in its housing and allowing the gears to not always mesh. A simple O-ring seems to have fixed the problem.

I've done a bit of driving these last couple days so finally got up to 141.8 miles and decided to do a fuel economy check to check my progress. Typically by 125 miles I'm down to 2/3 of a tank (or even less), today I was just shy of 3/4 according to the gauge.

The 141.8 miles I've logged took 5.887 gallons of diesel for a fuel economy of 24.09mpg for mixed driving. Pretty well right where I expected it to be. Looks like the O-ring trick worked for the odometer! Since I seem to be staying right around the same fuel economy consistently, I'm satisfied that my tweaks to the IP are good enough. Good power and good economy, that's the goal and that's what I seem to have now.
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'86 300SDL - "The Diseasel" 177K
'83 500SL Euro - "The Money Pit" 116K
'11 Honda Accord EX - "The Daily" 60K and counting...
The Diseasel Thread - Everything You Didn't Know You Wanted To Know
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