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Old 10-16-2010, 09:36 PM   #1 (permalink)
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Instantaneous fuel consumption datasets?

I see a lot of people talking in generalizations and estimates about these figures, and that really got me wondering. Is there a place where I can find such numbers? Are they even available?

And part 2... if there isn't such a place to get those datasets... would anyone here mind posting some up? There would need to be a standardized way of measuring, though. Those scanguages just might do it. There would need to be a standardized method (and format) as well. Once some samples are taken in a standardized way, it would be a matter of a little calculus and all that guesswork could be replaced with valid, reliable data (and corresponding 'rules') on a per-model basis. But that's if it already doesn't exist.

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Old 10-16-2010, 09:41 PM   #2 (permalink)
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I don't have a data logger, but I'm curious... what numbers did you want to crunch?

Myself, I'm interested in seeing the way people (myself, especially) actually drive, and how much of their energy is divided between aero, rolling, inertial, and gravitational loads.
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Old 10-16-2010, 11:03 PM   #3 (permalink)
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As far as i know most people here have a scangauge like device which doesn't typically have datalogging capability. I happen to have made my own scangauge like device and i have specifically put datalogging in the design. It shows me what condition my largest fuel usage occurs in and where my best or easiest gains can be found.

My system will log speed and injector on time for every second.

I like your idea, I had a similar idea which is why I put datalogging in but I have tried to evaluate mods with this data however it is not as straight forward as we would like. Calculating fuel usage change of a particular modification from these datasets has the same pitfalls as calculating fuel usage from an MPG read out from one of the gauges.
I have tried to measure fuel usage difference for several mods 3 times and every time there is a problem which makes the data unreliable. Any of the following variables influence fuel usage
- change in road gradient
- wind
- rain
- other cars (even very distant cars)
- starting and stopping location
- How the cruise control is working

for large impact on fuel efficiency these variables get washed out but you have to have more than around 3% efficiency change before this happens.

if your after more info on testing, metroMPG has done a whole lot of tests and generated and posted a lot of valuable data on modifications (with his method of testing and experience testing i trust the data he generates without question). There is also a thread somewhere about the best way to test.

Either way if your still after instantaneous data sets im happy to post up whatever you want. I can post highway driving, a set of my drive to work and back or anything else that I regularly do.
I did put a dataset (graph) for a before and after when doing my cold start idle reduction. I mostly put this up to better explain what the mod does and to give some proof for the results. The page it was posted on is here
Cold Start idle reduction - EcoModder

if you want datasets let me know and if i miss you requesting on this thread feel free to PM me as i only check the recent posts so i sometimes miss posts if i am not on for a while

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