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| Instant mpg / fuel flow sensor https://slantsix.org/forum/viewtopic.php?t=46414 |
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| Author: | PauloftheWest [ Thu Sep 22, 2011 10:17 am ] |
| Post subject: | Instant mpg / fuel flow sensor |
I'm very interested in my mpg--especially a digital readout of my current mpg (just like on fuel-injected systems.) My current problem is finding a reasonable fuel flow sensor, but let me explain where I am on my stock '65 dodge dart... So, the formula seems simple: current mpg = current mph / current gph. So, I wanted to first figure out how feasible this is. Speed can be retrieved from the speed cable. Since the speed cable rotates with the transmission, I count the number of rotations per second and calculate the speed based on tire size/ratio in the tail. This will require making a rotational sensor, wiring up a microprocessor (to calculate speed), a timer to trigger when a second has passed, and an small display. O, and program the microprocessor, of course. So, that last paragraph I can do for < $20. What I'm having difficulty with is finding some information on fuel flow senor at a reasonable price (to retrieve gph from the carb intake.) The best I have found is: http://www.amazon.com/Eagle-Red-Fuel-Fl ... B000Y845QS Which is $80, and uses NMEA 2000, which would require me to build a NMEA bus (something I haven't looking into the cost of nor the effort level.) Anyone know of a better alternative? I'm interested in calculating mpg while driving, not doing some trick, like wait till gas tank is empty, fill with a gallon, drive 55mpg until dead. calc from there... Anyone know of a better(cheaper) place for a sensor? Someone mentioned that old cars would have a fuel flow sensor in front of the carb. Does anyone know what cars do? Maybe I could hit up the junkyard. I feel like this should have been done before, but I haven't found anything that doesn't significantly modify my current setup. |
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| Author: | SlantSixDan [ Thu Sep 22, 2011 10:28 am ] |
| Post subject: | |
This what you describe was available in the 1970s/early 1980s. See here and here and here … maybe check eBay for NOS kits? |
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| Author: | PauloftheWest [ Thu Sep 22, 2011 3:48 pm ] |
| Post subject: | |
Dan, Thanks, there seems to be a lot of 'FloScan' devices around. 'Spacekom', and 'autocomp' seem to be harder to find. I'll research the 'FloScan' stuff, maybe I get a system or get, at least, the flow sensor for cheap. I have not dealt with NOS kits before. Do some hook up to the fuel line? The one I looked at http://www.amazon.com/NOS-07001-Sniper- ... B000COXACE seems to hook into the square bore, which would not provide any type of flow sensor/mpg meter. Now if I'm in the junk yard I know what to look for. ~PauloftheWest |
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| Author: | SlantSixDan [ Thu Sep 22, 2011 4:09 pm ] |
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Er…oops! NOS = "New Old Stock", a car part that is new (never been installed on a vehicle) but old (was made many years ago). It's confusing because "NOS" is also a brand of nitrous oxide systems, which are not applicable to any but race vehicles and have nothing to do with measuring fuel consumption. |
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| Author: | kesteb [ Thu Sep 22, 2011 8:02 pm ] |
| Post subject: | |
Quote: which are not applicable to any but race vehicles and have nothing to do with measuring fuel consumption.
Let's see, stomp on the gas, hit the button, watch the gas gauge go down. There seems to be a direct correlation to mpg...
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