Consumption function |
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phb10186
Really Senior Member I Joined: 18-April-2005 Location: North London Status: Offline Points: 331 |
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Posted: 21-August-2006 at 10:01 |
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Could somebody please explain how each of the 2 fuel-o-meters work, and their relative accuracy. I have the updated trip computer from '84 on. Where do each of these take their info from, and does the computer regard enriched running when the car is cold e.t.c e.t.c? I have always thought that the one below the tachometer is not really worth looking at unless you are cruising at a sensible speed. |
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1985 635 CSI with Style 134's 1998 Z3 2.8i |
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AndyS
Really Senior Member II The Last of the Few Joined: 21-August-2003 Location: 55 � North Status: Offline Points: 1365 |
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IIRC the computer takes a reading every 30 metres, calculates & updates the reading.
The Swing-o-meter is neither use nor ornament as far as I'm concerned. I'd rather have the oil temp gauge from the M cars. |
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phb10186
Really Senior Member I Joined: 18-April-2005 Location: North London Status: Offline Points: 331 |
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but where is it taking the reading from, and what is it measuring?
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1985 635 CSI with Style 134's 1998 Z3 2.8i |
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m3Cecotto
Bavarian-Board Forum Sponsor Joined: 29-September-2003 Location: Scotland Status: Offline Points: 791 |
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Induction vacuum I believe, but how valuable that is in terms of measuring fuel economy is beyond my ken. Edited by m3Cecotto |
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Brucey
Really Senior Member II Joined: 07-March-2004 Location: United Kingdom Status: Offline Points: 744 |
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it is also related to road speed/ engine rpm as well; induction vacuum is related to throttle opeing and hence fuel consumption BUT only if the engine is at constant temperature. Thus the readings are only evenremotely accurate if your engine is fully warm and your injection system is working properly. I believe the OBC reads injector pulses; not sure if it reads the cold start injector as well or not. cheers
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~~~~~~~ Brucey ~~~~~~ |
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