Fuel milage display

ziggo_2 · Posted: Wed Aug 20, 2008 6:45 pm Post subject: Fuel milage display

I was thinking of glassin' a new headliner. I wanted to install one of thos fuel milage gauges. Has anybody done this before? How do I do it? or cant I? Thanks

badsam · Posted: Thu Aug 21, 2008 8:48 am Post subject:

Anything can be done... if you can figure out how to do it. I don't know but I think there is a problem with the store bought fuel mile gages from plugging into an OBD 1 car.

No one to my knowledge has done this as yet... probably because most people on here are trying to build fast cars. Well.. fuel mileage and built engines are, virtually, mutually exclusive.

However there are those of us that are trying to go the other way... looking to get the best possible mileage without sacrificing current (stock) performance standards.

I would be most interested in your findings.

easye · Posted: Thu Aug 21, 2008 10:09 am Post subject:

I know that some "fuel mileage gauges are simply vaccum gauges. I've never seen one that plugs into the DLC

cavi_rs_94 · Posted: Thu Aug 21, 2008 6:16 pm Post subject:

cavdaddy05 · Posted: Thu Aug 21, 2008 8:49 pm Post subject:

how about that cool ass display that GPs have?/ MY 03 GTP has this little screen that tells you fuel effeciency, oil life, mileage, how many miles worth off gas you have left, etc

How could one get that in their J?

cavi_rs_94 · Posted: Thu Aug 21, 2008 9:01 pm Post subject:

thats what i am working on right now have been for about 4 months now. Im making it basically look like a edge tuner. I just have to finish the coding and hook it up.

cavi_rs_94 · Posted: Thu Aug 21, 2008 9:06 pm Post subject:

heres what it looks like right now, i know its not much but its a work in progrss

blackwidowz24 · Posted: Thu Aug 21, 2008 10:08 pm Post subject:

Lookin good Kyle.....so any estimations on when it'll be done?

whitelightning2 · Posted: Thu Aug 21, 2008 11:12 pm Post subject:

my cousin's old caddy had that, iirc it was OBD1 as well, i'll ask to make sure though.

cavi_rs_94 · Posted: Fri Aug 22, 2008 5:42 am Post subject:

hopefully soon josh. ( month or so) I have a had a few issues with it but overal its comming along nicely.

cobra17st · Posted: Fri Aug 22, 2008 7:11 am Post subject:

ziggo_2 · Posted: Fri Aug 22, 2008 8:17 pm Post subject:

whitelightning2 · Posted: Fri Aug 22, 2008 8:40 pm Post subject:

Cobsux may be on to something, the old ones might have just been a tap off the MAP sensor and be displaying the same thing that a manual economy vacuum gauge would say..

to accurately calculate MPG on the fly you'd need to be able to get MPH and Injector pulse width from the ECM and you'd have to know how many gallons/hr the injectors are. You'd need an ALDL connection running datalogging software with a $A1 code mask on a seperate computer to do all the calculations and display them in real time.

OBD2 systems have the programming to calculate all this and output it to a display, OBD1 does not.

88ragtop · Posted: Mon Aug 25, 2008 1:15 pm Post subject:

scott0999 · Posted: Mon Aug 25, 2008 4:34 pm Post subject:

sounds like alot of work for something that prolly wouldnt be accurate

instead of putting time & $ into that how about you change the o2 sensor, air filter, fuel filter, plugs, check tire pressure, remove excess weight, and go 60mph on the highway when you can..

if your really concerned about MPG that is..

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