Date: Tue, 11 Aug 1998 12:24:08 -0700
From: Justin VanAbrahams <jvanabranopsamnet>
Subject: Re: '98 SID II - mileage doesn't match odometer


Duncan Elkins wrote: > > I clear both the mileage on the "distance" function of the SID and the trip > odometer at the same time (e.g., when I fill up with gas.) I've noticed, > however, that they don't read the same after I've started driving. The > difference seems to increase with the miles recorded (i.e., the error > accumlates.) This seems odd to me. Has anyone else noticed this? Do the > two displays sense distance travelled differently? > > -Duncan Elkins I assume you're talking about the "distance remaining" function of the SID, yes? If so, they do in fact get their readings from different places... the odo is purely mechanical - it gets it input from the speedo.... the SID gets its info from the fuel level sender in the gas tank and an output from the fuel injection computer (to know how much fuel is being dispensed). Since there is so much variation in driving - hills, acceleration, coasting, idling, etc. - gas consumption is not constant... The SID makes a mighty good guess at current remaining distance based on how much fuel is *currently* being used and how much is currently left... If you change driving style, say from coasting to idling it will revise its estimate... -Justin

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