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  #61  
Old 09-12-2017, 08:52 PM
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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, 10:55 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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  #63  
Old 09-18-2017, 11:22 AM
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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
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  #64  
Old 09-18-2017, 12:06 PM
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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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  #65  
Old 09-22-2017, 10:53 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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  #66  
Old 11-04-2017, 12:35 AM
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Did 413 miles on 17.5 gallons of fuel this latest fillup, gives me 23.6mpg. I'm satisfied that both the odometer and the IP tuning are working like they should at this point. Should be interesting to see how the economy numbers come out when the A/C finally gets switched off for the winter months.
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  #67  
Old 11-04-2017, 12:37 AM
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Also, hard to believe it took this long to bleed the fuel tank down that far. My last fillup was over a month ago! Funny how long fuel lasts when you're driving to a destination instead of driving to waste fuel/measure economy and tuning
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  #68  
Old 11-15-2017, 10:19 AM
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I did my first long highway drive in this car since tuning the IP and it's surprisingly good on fuel on the highway! 75mph with the A/C running and it did 327 miles on 11.123 gallons of fuel. That's 29.4mpg! I'm a happy camper. Truly amazing that old barge will turn fuel numbers like that.
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  #69  
Old 11-16-2017, 06:44 PM
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Quote:
Originally Posted by Diseasel300 View Post
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.
Yes a properly adjusted 3.5l IP can work very well on a 603, I finally did everything right, the first time I must have had an air bubble in the filler neck and had an error.
This time I filled to the line on the neck of my '87 300D fitted with 3.5L pump (set up and calibrated at the Bosch shop) took a trip and 328 miles later I filled back up to the same level with 11.6 gals.
With a calibrated speedometer at 70MPH its less than 2% error
Thats a mileage figure of 28.27 MPG.
This was mostly (95%) freeway miles with as constant a speed around 65-70MPH as I could achieve without my cruise control working and a few brief spurts to 80. No AC.
I think thats better than I ever got before I replaced the stock IP and had the injectors pop tested. My friend said if I filled the tires with a few more Pounds of air and stuck at 60MPH I might make 30MPG but thats something I am never going to do
DDH
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  #70  
Old 11-16-2017, 08:02 PM
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DDH you're right there with my previous fillup of 327 miles in 11.123 gallons, roughly 95% interstate miles as well. Surprising economy in a LWB 126, but I'm completely happy with it. Good power, no smoke, starts easily, and good economy. I'd say it's pretty well set! No Bosch shop here, but I got REALLY lucky dialing it in on the 2nd try.
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The Diseasel Thread - Everything You Didn't Know You Wanted To Know
Delivery Valve as Source of Nailing Thread
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