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Old 08-31-2008, 12:16 PM   #1 (permalink)
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Join Date: Nov 2007
Location: 1000 Islands, Ontario, Canada
Posts: 22,119

Blackfly - '98 Geo Metro
Team Metro
Last 3: 70.09 mpg (US)

MPGiata - '90 Mazda Miata
90 day: 53.56 mpg (US)

Winter beater Metro - '00 Chevrolet Metro
90 day: 61.98 mpg (US)

Fancy Metro - '14 Mitsubishi Mirage top spec
90 day: 58.72 mpg (US)

Even Fancier Metro - '14 Mitsubishi Mirage top spec
90 day: 64.03 mpg (US)
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MPGuino installation/setup: 1998 Geo Metro (Pontiac Firefly)

dcb recently sent me a "care package" with a couple of components my small town rat shack didn't have. To my surprise there was also an "evaluation" MPGuino in the box!

I hooked up to the car (1998 Pontiac Firefly 1.0L TBI 5-speed) this weekend.

Random observations:

1) COOL!!!

2) finding the injector & VSS wires was easy, mostly because dcb has the same car as mine and has blazed that path already (with pictures!):

3) with those settings, the MPGuino was showing half the MPH that the speedometer/ScanGauge showed, so I halved the VSS Pulses/Mile value in the MPGuino setup (to 8204), and that seemed to fix it.

4) I still need to factor in an additional offset for VSS Pulses/Mile, because the transaxle I swapped into my car (with a taller final drive ratio) was originally calibrated with a smaller tire size (diameter) than my tires.

5) The car's MPH display is jumpy, as dcb already noted with his Metro, though he also found that despite this, the total distance traveled seems accurate.

I was thinking I could calibrate my car's VSS pulses/mile setting by jacking up the drive wheels and idling the car in 5th gear to rack up some mileage without having to drive around unnecessarily. It seems to idle @ about 30 mph.

Any technical reason I shouldn't do this? (Aside from the fact it'll pad my tank MPG with some awesome numbers - seems to get about 150 mpg idling in 5th on jack stands. )

I probably won't have a chance to calibrate the MicroSec/Gallon until I get back from the tall ship race though, because I'll have to do some actual driving to tweak it.

Honda mods: Ecomodding my $800 Honda Fit 5-speed beater
Mitsu mods: Oops, I did it again! Bought another cheap, 3-cylinder Mirage. Mods in progress...
Ecodriving test: Manual vs. automatic transmission MPG showdown

has launched a forum for the efficient new Mitsubishi Mirage - fuel efficiency info for Geo Metro owners - electric car conversion on a beer budget
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