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Registered
Join Date: Dec 2006
Posts: 213
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Mpguino fuel metering
Has anyone played with the MPGuino open source boards available? See http://opengauge.org/mpguino/
I would quite like something that gave me a clue about fuel efficiency as my best mpg figures have been obtained when thrashing the car.. but an instant readout would be quite good fun. I would need to identify two signals, the injection pulse at a single injector (going to 12V for the pulse duration; think this just needs inverting as I seem to remember reading we have a line that is pulled low when the injector fires. The other is a pulsed signal that equates to speed: I know we have reference sensors that trigger off the flywheel, but is the speedometer electronic or mechanical? Otherwise a hall effect device on an axle shaft might be required, anything else that could be used relatively easily? regards Rissole
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944 Alpine White '89 2.7L |
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12-12-2009, 02:15 PM
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Redline Racer
Join Date: Jan 2007
Posts: 2,444
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On 85.5 and later cars, the speedo is electronic and has the sender on the transaxle somewhere, I can't remember exactly where. The early cars are mechanical driven off the left front wheel, but if it has the upshift indicator and/or a fuel consumption guage, then there's a small hall sensor on the back of the speedo for those functions.
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1987 silver 924S made it to 225k mi! Sent to the big garage in the sky |
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12-13-2009, 03:13 PM
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