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#1
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Has anyone observed actual fuel economy gains from chip tune?
I'm familiar with the various claims for and explanations of fuel economy gains when doing a chip tune. That was part of what motivated me to get my 98 E300 tuned (Stage 2 from Rocketchip) about a year ago. While the power improvements were real and measurable, I noticed absolutely no fuel economy gains.
I have no regrets about doing the tune...but a bit disappointed I'm still getting the same mpg. FYI it's 26.4 mpg over the course of 6500 miles, 72% highway driving.
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14 E250 Bluetec 4Matic "Sinclair", Palladium Silver on Black, 154k miles 06 E320 CDI "Rutherford", Black on Tan, 172k mi, Stage 1 tune, tuned TCU 91 300D "Otis", Smoke Silver on Tan, 142k mi, wastegate conversion, ALDA delete 19 Honda CR-V EX 61k mi Fourteen other MB's owned and sold 1961 Very Tolerant Wife |
#2
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Yes. My Ford 7.3 liter PowerStrokeDiesel got an improvement of 1 to 2 mpg when programmed with a tuner and the removal of it's muffler.
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#3
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I had a cross - country run of 1,500 miles to record several fuel calculations, so, I can absolutely report a 10% to 20% increase in mpg for my truck.
I would suspect that doing away with the constrictive exhaust components would give any diesel ' s mpg return a kick Upward. 1 mpg is approximately a 10% increase in fuel economy on an HD truck. Quite significant! What I don't have is data on these separately, because the detuning of the engine programming was coupled with a replacement muffler. |
#4
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Quote:
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#5
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Not sure about exhaust regulations. The tuner indicated that Stage 2 was (a) the most I could do without hardware mods (e.g. exhaust) and (b) that it would yield a 3-4 mpg increase. That didn't happen.
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14 E250 Bluetec 4Matic "Sinclair", Palladium Silver on Black, 154k miles 06 E320 CDI "Rutherford", Black on Tan, 172k mi, Stage 1 tune, tuned TCU 91 300D "Otis", Smoke Silver on Tan, 142k mi, wastegate conversion, ALDA delete 19 Honda CR-V EX 61k mi Fourteen other MB's owned and sold 1961 Very Tolerant Wife |
#6
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For what its worth, I gained 3-4 MPG after a bunch of supporting mods and tuning on my Duramax and the tune isn't really an MPG tune but more of a towing tune. I have a programmer/flasher called EFI Live which essentially makes the OEM engine electronics a standalone fully tuneable computer. I can adjust anything I want, engine & transmission plus it is a data logger and scan tool. Its a pretty sweet system. I deleted the large coil intake heater element (not needed here) and went in with my laptop and switched the circuit off in the ECM and turned off the fault code for it! I can even change the message in the inst. cluster when you start the vehicle from, "Fasten your seatbelt" to what ever I want it to say! I wish this type of system was available for more vehicles.
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87' 300D, Currently undergoing an OM606 swap/build! SUPERTURBO!!! 03' 2500HD Dmax + goodies! 82' 300SD, parting out! 93' 300TE 4matic, parting out! 83' 240D Project Cheap Drive 89' 300E, parting out! 74' Datsun 510 wagon 88' RX7 10thAE, 13B track car build soon Skippy~ As for perception: Drive what you like and can afford. Those who don't like it can supply vacuum to one of your components. LOL If you need parts, I have some! |
#7
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I have never been able to understand how a chip tune on this engine would give a MPG increase. All the ECU can do is control the rack. Now, they might have a less aggressive fueling curve but that would defeat the purpose if you want snappier performance.
I have the identical experience with my PSD to Joe above. The injection on this engine is a different animal and the ECU has direct control over injection events and timing. The tuners can dial in more advance to boost economy. I can literally sit in the truck with it idling, change fuel/timing maps and hear the sound of the engine change as the ECU adds timing on the economy setting. On my car, I gained about 1-2 MPG after I switched pump elements and injector nozzles. My assumption is that the increased combustion efficiency is the "culprit" in this case.
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-Evan Benz Fleet: 1968 UNIMOG 404.114 1998 E300 2008 E63 Non-Benz Fleet: 1992 Aerostar 1993 MR2 2000 F250 |
#8
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Any chip that connect to your maf,or air temp sensor is simply a resistor.The only real thing for most mercedes,is mail you computer to be chipped,about $500.You can on gasoline engines advance timing be using 1.1k resistor between temp sensor to computer.Diesels nneed larger volume injectors,and a pump that will fill them,and if electronic,a updated program.
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1999 w140, quit voting to old, and to old to fight, a god damned veteran |
#9
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See KARTEK's post. I'm betting your tuner doesn't want to get involved with pulling exhaust systems or regulations. |
#10
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I agree with the general thoughts on the E300D, there isn't much control over the engines fueling, its still a mechanical pumped IDI engine. On our tuned trucks for example, for one they are direct injection and the big ticket is there is vastly more variable control over the injection system with electronics.
I also agree, to gain more back, your going to have to tinker with more mechanicals of the car to see gains. Less exhaust restriction and better breathing will help make the most of what the chip has made available. Getting rid of the EGR and cleaning all of the gunk out of the intake and intake ports will help tremendously if they look anything like my 606 did. The buildup in most of my ports was about 50% plugged up at the valve, a few were worse than that.
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87' 300D, Currently undergoing an OM606 swap/build! SUPERTURBO!!! 03' 2500HD Dmax + goodies! 82' 300SD, parting out! 93' 300TE 4matic, parting out! 83' 240D Project Cheap Drive 89' 300E, parting out! 74' Datsun 510 wagon 88' RX7 10thAE, 13B track car build soon Skippy~ As for perception: Drive what you like and can afford. Those who don't like it can supply vacuum to one of your components. LOL If you need parts, I have some! |
#11
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Makes sense. But I'm plenty happy with the car as is, so no real inclination to modify any of the hardware. Definitely performs better than it did.
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14 E250 Bluetec 4Matic "Sinclair", Palladium Silver on Black, 154k miles 06 E320 CDI "Rutherford", Black on Tan, 172k mi, Stage 1 tune, tuned TCU 91 300D "Otis", Smoke Silver on Tan, 142k mi, wastegate conversion, ALDA delete 19 Honda CR-V EX 61k mi Fourteen other MB's owned and sold 1961 Very Tolerant Wife |
#12
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On previous cars I have had remapped I have found that the actual map isn't what gives the increase in MPG but more about the ability to drive more efficiently - I have found with a remap the throttle response is sharpened up a bit and there is increased low down torque. This means that you don't need to put your foot down as much or as long to get the car to maintain a certain speed. Couple the remap with an air intake and better exhaust to further increase throttle response and you will see an improvement in MPG overall. Remapping on the CDI will yield better MPG increase owing to the fact that the fuel is injected more precisely. Initially its probably best to just give the car a really good service and change all of the fluids. I would definitely change the airfilter for a new one (even the paper ones are fine) and cleaning the MAF sensor would also be a good idea.
Although saying that, my daily drive (Renault Clio 1.5dci) is currently averaging around 83mpg, the only difference on that car is that I have removed the restrictive snorkel which feeds the airbox, everything else is stock (Manufacture claimed figures are only 67mpg!).
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UK spec Mercedes W210 E300 Turbodiesel wagon - OM606.962 with 722.6 transmission - rust free! |
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