Steady driving does it alter the ecu
07 July 2003, 06:31 PM
#1
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Gents
Can someone tell me if i drive the scooby steady for a fair distance over a few weeks does the engine management adjust and reduce the power output and increase the mpg? The reason for this question is that i have been doing a lot of short journeys and have not given it any real boot,but when i just gave it some the response was a bit restricted then at about 5000rpm there was sudden surge and it was back to normal Thirsty and Quick from 3000rpm upwards.....(MY00)..
Powerman
Can someone tell me if i drive the scooby steady for a fair distance over a few weeks does the engine management adjust and reduce the power output and increase the mpg? The reason for this question is that i have been doing a lot of short journeys and have not given it any real boot,but when i just gave it some the response was a bit restricted then at about 5000rpm there was sudden surge and it was back to normal Thirsty and Quick from 3000rpm upwards.....(MY00)..
Powerman
07 July 2003, 10:37 PM
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Err, 'no' springs to mind 
I'm pretty sure that the ECU will retard where necessary, but that's about it. It will also slowly advance over time as well (to a point - the same point as when it was reset, if it is able to).
More advance will give better economy, but really that's only an issue at cruise. Unless something was seriously wrong, the advance at cruise won't be retarded anyway, so it won't be advanced again when it's safe to, so wouldn't make a difference.
I'm pretty sure that the ECU will retard where necessary, but that's about it. It will also slowly advance over time as well (to a point - the same point as when it was reset, if it is able to).
More advance will give better economy, but really that's only an issue at cruise. Unless something was seriously wrong, the advance at cruise won't be retarded anyway, so it won't be advanced again when it's safe to, so wouldn't make a difference.
08 July 2003, 03:23 PM
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Powerman
What you're describing is the ecu "bug" that allows imprezas to pass the european 50kph noise regulation drive-by test. If you hold about 50kph in second for more than a couple of seconds, then floor it, the ecu restricts boost to 7psi upto 5000rpm and then allows full boost to develop, hence your experience. Subaru found the standard impreza couldn't pass this regulation on full boost. You can drive around it relatively easily, or just fit another method of boost control to get rid of it completely
Simon
What you're describing is the ecu "bug" that allows imprezas to pass the european 50kph noise regulation drive-by test. If you hold about 50kph in second for more than a couple of seconds, then floor it, the ecu restricts boost to 7psi upto 5000rpm and then allows full boost to develop, hence your experience. Subaru found the standard impreza couldn't pass this regulation on full boost. You can drive around it relatively easily, or just fit another method of boost control to get rid of it completely
Simon
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