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Re: improving fuel consumption & SID response
Posted by Bill D (more from Bill D) on Wed, 19 Dec 2001 19:47:05
In Reply to: improving fuel consumption, Dean, Tue, 18 Dec 2001 09:21:26
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Dean, the SID essentially counts the pulses triggering the fuel injection. IE if you push the gas pedal down, the fuel injection will work faster and the SID will count more pulses = more gallons used. Now if the gas gets colder = more dense, for same gas pedal position, you will (initially) feed more volume of gas than needed (as gas is denser). But O2 sensor will detect rich condition and cut back on fuel injection pulses for that gas pedal position. And so the SID will count less pulses and should report less gallons used = better mpg. The above assumes the SID is fed the same info as the fuel injection system and converts those pulses correctly to gallons consumed. In practice, the fuel injection system may receive adjusted data that is not fed to the SID e.g. because the fuel inkection system may use a fuel mapping based on a number of variables, but the SID does not recieve the same info.
posted by 24.30.2...
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