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Old 21 Nov 2011
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Join Date: Jan 2008
Location: UK
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Quote:
Originally Posted by AliBaba View Post
Are there any other bikes then BMW that use a knock sensor? Do you know if it alters the mixture (on the BMWs)? As far as I know they can use Super on the emission-tests so it should be possible to pass the test on Super and run fatter on low-octane.
Can you wire a knock-sensor to MegaSquirt and use it for mapping?
The BMW F800 (actually not a BMW but a ROTAX engine) doesn't use a knock sensor. There are more knowledgeable peeps on here about that bike them me but I seem to remember reading that BMW dealers will download a new map for lower octane fuels if you ask them nicely. That engine probably runs high compression and has a good combustion chamber design. Also it's a light(ish) weight bike, well geared hence the good fuel economy. The GS has knock sensors though.


Honda's super sports bikes have had knock sensors on them for a while now ( NGK SPARK PLUG CO., LTD. | Others ) but to me they seem very useful on a ADV bike where you might encounter the different conditions likely to cause knock, factors like unknown fuel type, air temperature extremes, coolant temperature extremes, air/fuel mix, air density, etc, etc. and you have tuned the engine to the extremes of lean to get extra range out of it. Best of all is to have a simple motor that will be unlikely to knock in the first place 'cos it's knackering to the engine!


Third party sensors can be wired to Megasquirts and you adjust the software to suit



but to counter knock the ECU will retard the ignition not enrich the mixture.
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