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Old 09-14-2008, 09:09 PM   #11 (permalink)
dcb
needs more cowbell
 
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Join Date: Feb 2008
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pimp mobile - '81 suzuki gs 250 t
90 day: 96.29 mpg (US)

schnitzel - '01 Volkswagen Golf TDI
90 day: 53.56 mpg (US)
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Ok, married the meter to a MPGuino for a road test, piece of balsa/hot glue, my fave





OBSERVATIONS:
1. The refresh rate of 1/2 second makes the meter seem very un-analog. While having a refresh rate works well with an LCD (gives you a chance to read it), the analog gauge should probably be updated with every injector pulse and the average 1/2 second of speed.

2. It needs a backlight.

3. It was a bit bouncy with the road, one of those aftermarket tachs might make a better in-car meter for this sort of thing (might even have a backlight).

So room for improvement certainly, and an instant mpg without a trip mpg is of dubious value unless you are a complete hiway star. But it is certainly a doable thing with very little hardware.

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