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Originally Posted by Stu
I can't believe it is anything other than psychological benefit at other than low revs.
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As far as I know all modern engine management systems have a throttle position sensor. This sensor does not just tell the fuel injection system when to start adding more fuel but it is also used to determine how much. The management system will be monitoring the quantity and possibly density of the air entering the engine and read messages from the TPS of what the rider/driver wants to do i.e go faster, stay at a constant speed or slow down. Hence the adjustment of this sensor is important for the whole rev range not just low revs. If incorrectly adjusted the fuel mapping for the engine can be completely wrong throughout the whole rev range.
On more complex system a knock sensor will be used, the ECU will use this information to constantly adjust the ignition timing for maximum effeciency. If the SV had one of these you would get the full benefit of fuels like Shell V Max.
Kind regards
Tim