Ok, I understand fuel injection.
I have been reading past posts here, and the system on my 2009 seems to work well, it just has limitations as to the range it can adjust for in its basic form.
People who put less restrictive exhausts on, and/or open up the air cleaner run into a problem with lean running, as the system has limited range and only under some conditions, at other times, it just uses maps (open loop).
The system looks at air intake temps, engine temps, and other things to adjust the mixture, it sometimes looks at the oxy sensors.
People spend lots of money to have the maps changed, or buy gizmo's to 'fool' the ecu into thinking things are different to correct the lean burn.
What about changing things yourself, like, the engine or air intake temp sensors to tell the ecu the intake air, or engine temp is just a little bit cooler than it is?
Most temp sensors vary resistance with temp, so would it be possible to add a resistor to make a sensor read that the temp is just a little bit cooler than it is and the ecu will adjust the mixture (slightly) richer?
The sensor would still have a lot of input, the oxy sensors would still control things, etc.
I don't have the shop manual, which may or may not say what does what, but say the engine temp sensor is used to set the mixture, and it reads 1000 ohms hot, and 100 ohms cold. Could you not put a 1500 ohm, or 2000 ohm resistor across it, and have it read say 800 ohms hot instead of 1000 ohms, and it would still read 100 ohms cold, or about 99 ohms....
Does the shop manual go into details about the sensor resistance, and what the sensor controls (engine temp, air temp).
On some older fuel injection systems, the air intake temp sensor just retarded the ignition timing on intake temp rise to eliminate ignition knock, on modern setups it has an input on the mixture control.
If a system was to use both the engine temp, and air intake temp for mixture control, it would likely use engine temp as the major mixture control input, with the air intake for fine adjustments, which would allow one to play with the air intake reading for changing the mixture a bit....
I am sure the bikes run on the lean side stock, any mods would just make it worse...
Brett
I have been reading past posts here, and the system on my 2009 seems to work well, it just has limitations as to the range it can adjust for in its basic form.
People who put less restrictive exhausts on, and/or open up the air cleaner run into a problem with lean running, as the system has limited range and only under some conditions, at other times, it just uses maps (open loop).
The system looks at air intake temps, engine temps, and other things to adjust the mixture, it sometimes looks at the oxy sensors.
People spend lots of money to have the maps changed, or buy gizmo's to 'fool' the ecu into thinking things are different to correct the lean burn.
What about changing things yourself, like, the engine or air intake temp sensors to tell the ecu the intake air, or engine temp is just a little bit cooler than it is?
Most temp sensors vary resistance with temp, so would it be possible to add a resistor to make a sensor read that the temp is just a little bit cooler than it is and the ecu will adjust the mixture (slightly) richer?
The sensor would still have a lot of input, the oxy sensors would still control things, etc.
I don't have the shop manual, which may or may not say what does what, but say the engine temp sensor is used to set the mixture, and it reads 1000 ohms hot, and 100 ohms cold. Could you not put a 1500 ohm, or 2000 ohm resistor across it, and have it read say 800 ohms hot instead of 1000 ohms, and it would still read 100 ohms cold, or about 99 ohms....
Does the shop manual go into details about the sensor resistance, and what the sensor controls (engine temp, air temp).
On some older fuel injection systems, the air intake temp sensor just retarded the ignition timing on intake temp rise to eliminate ignition knock, on modern setups it has an input on the mixture control.
If a system was to use both the engine temp, and air intake temp for mixture control, it would likely use engine temp as the major mixture control input, with the air intake for fine adjustments, which would allow one to play with the air intake reading for changing the mixture a bit....
I am sure the bikes run on the lean side stock, any mods would just make it worse...
Brett
