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How to perform a speed vs fuel consumption analysis for a Ford F-250

How to perform a speed vs fuel consumption analysis for a Ford F-250

How to perform a speed vs fuel consumption analysis for a Ford F-250

(OP)
Hi All:

I am a mechanical engineer, however, I did not go the ICE route. How do I perform a speed vs fuel consumption analysis for a Ford F-250 pick up truck. Also, can anyone direct me to any internet sites that provide in depth information on this subject. Any help will be greatly appreciated.

Thanks In Advance,
Chris
 

RE: How to perform a speed vs fuel consumption analysis for a Ford F-250

Do a search here.  There was a thread with an EPA fuel economy link with some data.

TTFN

FAQ731-376: Eng-Tips.com Forum Policies

RE: How to perform a speed vs fuel consumption analysis for a Ford F-250

Are you trying to calculate it or measure it?

Cheers

Greg Locock

SIG:Please see FAQ731-376: Eng-Tips.com Forum Policies for tips on how to make the best use of Eng-Tips.

RE: How to perform a speed vs fuel consumption analysis for a Ford F-250

I would accurately measure the fuel used over a know distance at he specified speed. You will need along straight fat stretch of road. Do it both ways for any accuracy. Do it several times both ways for more accuracy.

Regards

eng-tips, by professional engineers for professional engineers
Please see FAQ731-376: Eng-Tips.com Forum Policies for tips on how to make the best use of Eng-Tips Fora.
 

RE: How to perform a speed vs fuel consumption analysis for a Ford F-250

(OP)
Hi All:

Thanks for responding, I really appreciate all of your input. I trying to calculate fuel consumption at various speeds. Essentially, I am developing a fuel consumption calculator to approximate the cost of fuel for a truck traveling at low speeds (5-10 mph) for a mosquitoe spraying operation. Thus far, with the help of this forum, I have located the EPA engine certification coefficients and have calculated the horsepower at various speeds. Now, how do I correlate this with fuel consumption.

Again, Thanks In Advance
Chris

RE: How to perform a speed vs fuel consumption analysis for a Ford F-250

That speed range will most likely be off the bottom end of any scale. The power that it takes to push the truck along is almost irrelevant because the engine will be at idle speed or close to it.

I would be tempted to find out how much fuel the engine uses at idle (or at whatever engine speed it takes to go at that road speed) and then just go with that.

For what you are doing, if the truck is new enough to have OBD-II, you can get the required fuel flow rate from the on-board diagnostics with a scan tool. You've not stated which engine it has, nor what year it is.

RE: How to perform a speed vs fuel consumption analysis for a Ford F-250

The terrain and tyres will have some impact as I expect rolling resistance will become a significant variable depending on surface.

Regards

eng-tips, by professional engineers for professional engineers
Please see FAQ731-376: Eng-Tips.com Forum Policies for tips on how to make the best use of Eng-Tips Fora.
 

RE: How to perform a speed vs fuel consumption analysis for a Ford F-250

How old is the truck?  If it's newer and has OBDII then you can buy a Scangauge 2, plug it into the computer and it'll tell you gallons per hour, instant mpg, and average mpg.

RE: How to perform a speed vs fuel consumption analysis for a Ford F-250

Unless you can locate the BSFC map for the engine then you won't be able to calculate it accurately, and they are rather hard to find. I think testing is the way to go. As Pat says, terrain will have a huge effect.

 

Cheers

Greg Locock

SIG:Please see FAQ731-376: Eng-Tips.com Forum Policies for tips on how to make the best use of Eng-Tips.

RE: How to perform a speed vs fuel consumption analysis for a Ford F-250

You can get relatively close by logging the injector duty cycle, rpm, fuel pressure, and speed.  If it's OBDII(as someone already stated) it will be real easy.  If not, let me know I could look around for some stand-alone data logging equipment.  The idea is that if you know the max flow capability of the injector(can be found in the factory manual) and the duty cycle, you can figure instantanious fuel flow at a certain rpm and load.  You then match the instantaneous flow with the speed.

RE: How to perform a speed vs fuel consumption analysis for a Ford F-250

...and wind and terrain will still have a huge effect.

Cheers

Greg Locock

SIG:Please see FAQ731-376: Eng-Tips.com Forum Policies for tips on how to make the best use of Eng-Tips.

RE: How to perform a speed vs fuel consumption analysis for a Ford F-250

Absolutely....wind and terrain make a huge difference

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