ah yes, I remember now that some vehicles report both sensors (though only use one).

I'll see if I can sort that out in 1.4.11 for you. Probably out this weekend. Yes, diesel MPG support is a bit off at the moment I think so it will take a couple of go's to get it right

Ian

I'm very happy to see some progress and more than willing to give you whatever data you need to improve on it. Just let me know if you need logs or anything.

Nate

I was also thrilled to see some progress on the diesel mpg support! However, I also am not getting the correct mileage (no change from the previous release). My 98 Jetta TDI typically gets about ~52mpg at highway speeds, and Torque reports ~14mpg. I went through the settings and updated the needed info, but to no avail.

If there is any support I may offer as well, I would be happy to do so.

Thanks again for such a great product, and following through on the continued feature requests!

Ok, I'll be updating the MPG in the next couple of versions - hopefully I can iron out the issues (the main problem being I don't have a diesel!) 🙂

Bear with me and I'll get the mpg function accurate.

I have the Ford 6.0l F350 and i will also let you use me as a test bed. I just downloaded the updated version and will use it over the weekend and give you some feedback.

Great work

Going to stab a guess you are using the MAF in the calculations somewhere. I'm basing this on when I throttle off my MAF increases and the MPG decreases. Unfortunately a diesel will continue to force air into the engine even when it is using no fuel. If a hill is steep enough I can even build up some boost but still use zero fuel. To put it simply, when the engine load on a diesel is zero it is using zero fuel. If you wind a window down while rolling down a hill on engine braking you'll notice that the 'clatter' from the engine has stopped. Effectively the engine isn't running.

Please don't take any of this the wrong way, I love Torque and just want to help make it better, and your a roadie owner 😉

The scangauge asks you to observe one of the gauges to see if it rises or falls on reving the engine. You then choose engine type a or b depending on your readings. I'm guessing this is how it works out which sensors to calculate MPG from.

I'm varying the air-fuel ratio based on the engine load as part of the calculation, which is how diesels go

most mpg i'v had on diesel on app so far is 18 (but shoots up to like 35-40 when i break?) when actually car is doing around 40-45.

this is on a volvo v50 2.0 diesel, done weight settings etc. too

Well done sir. Newest release show much more promising MPG result. Still to do some long runs to test it. Now I can use my eco warrior tree 😉

The fixes are in the right direction. Thanks, Ian. I was getting fairly close results on MPG...my calculation was 13 and Tourque was getting 14.7. But something happened on my way home and the Average meter dropped to like 3 mpg and stayed there. The real time gauge read 7 mpg. This happened about halfway home (22 mile commute).

There is a chance it is due to my equipment. I have a China Dongle. As soon as I saw this happen I decided to purchase an OBDLink Blue Tooth. It just arrived. I will be testing this new dongle on the way home tonight and hopefully report the results back here in a more timely manner than this last post.

Thanks for the hard work on this, Ian.

Nate

Wow! The new OBDLink adapter made a huge difference. All the dials were smooth and accurate and did not drop connection at all. I was little skeptical about the reports on how bad the Chinese dongles are. Now I am a believer.

So the mpg calculation seems pretty darned accurate. My dash.computer is off a little. I do hand calcs and know the dash reports a slightly better number than is accurate. Torque's numbers were a lot closer to the numbers I hand calculate. About half way home I reset the dash and torque at the same time and when I got home they both were within .5 mpg. Tongue seemed to be closer to real time. Tue dash computer seems to have more of a curve to smooth out peaks and valleys.

Nate

I've run into these same issues. Running the latest version, and have an 07 Silverado. Hope that the tweaking is on-going as I have the same desires, using for towing heavy loads.
Thanks Ian!

I am using Torque v 1.5.11 (which I think is the latest) on a Chinese generic ELM bluetooth adapter that appears to work fine. The car is a Hyundai i30 cw crdi. My main interest in this setup is for fuel consumption feedback while learning to drive this car efficiently, as I am unfamiliar with diesel engines. I have not yet calibrated fuel usage readings against topup quantity since refuelling is a mercifully infrequent event for this car. Meanwhile I have done a few trips using Torque to log every variable in sight then picked through the entrails with a spreadsheet to investigate relationships.

I know my car's OBD readout does not include a fuel usage or efficiency value so I was curious to know how Torque calculates fuel usage. Dividing Torque's litres/100km value point-by-point by the corresponding speed in km/hr, I derive a fuel usage rate series which turns out to exactly track the MAF reading, as suggested by other bloggers. This seems to assume a constant fuel-to-air ratio which is not right for a diesel. I expected some formula involving the product of MAF with %load and a factor involving the stochiometric reaction ratio on the assumption that %load corresponds to the fraction of maximum burnable fuel actually injected. The calibration factor probably needs impirical fudging anyway.

I don't know whether there is also a complication with EGR, which moves in mysterious ways on this vehicle, both EGR Commanded and EGR Error values flipping incoherently between bimodal values. I don't see any correlated reduction in MAF readings which I assume measure fresh air intake, so it seems recirculated exhaust gas just adds to the fresh air MAF going into the inlet. The question is whether that changes the relationship between MAF, %load and the fuel injection rate. My best guess is that it doesn't.

The engine compartment is so tightly packed that it is hard to see where the different pipes, valves and sensors are. There seems to be an unexpected butterfly throttle in the inlet tract but this is maybe the EGR actuator. I would dearly like to get hold of a workshop manual for the i30 crdi but these are hopelessly expensive and Hyundai seem to think that it is none of my business to know how the engine works.

I look forward to enlightened explanation of these mysteries.

Hi

1.5.11 isn't the latest version, and the fuel usage is currently bugged in that and the current version for some diesel vehicles. This will be fixed in the latest update due out this week (1.5.16)