07-04-18, 09:54 PM
(07-04-18, 04:53 PM)agricola link Wrote: I ve recently fitted Scorpion end cans and de-cat pipe. My understanding is that on fuel injected machines, the ecu adjusts fuel supply based on information sent to it by the O2 sensor, so aftermarker exausts/air filters are compoensated for automatically. Is that correct?
Only partially. The type of O2 sensor used on motorcycles is 'narrow band' and is only used when the bike is running at steady throttle [cruising along] to keep the bike as close to stoichiometric fuelling (14.7:1), it effectively gives a high-low output and does not tell the ECU the exact amount of fuel being burned. In all other conditions - closed throttle, under load, WOT etc - the ECU looks at the map in it's rom. That's the purpose of things like the power commander, they pull the map nodes in the direction required by the tuner. A 'wideband ' O2 sensor can be used to alter fuelling at all points and it's why you buy 'autotune' or similar devices [I dont rate them for motorcycles, as the response is too slow compared to the fuelling change rate].