Guys,
Highsider989 asked me if I would chime in on the large fuel injector that is available from Japan.
First, give me a second to let you know what I do. I work for one of the oldest & largest industrial engine manufacturers in the US. I'm presently working on their latest prototype engine program. I designed all the induction, including the cylinder head ports. I also am in charge of all the testing. My last project was their EFI engine, converted from carburation.
OK, so much for that:
All most all EFI systems monitor:
intake temperature, intake pressure and air density - what kind of day is it, IE, hot & muggy, cold & dry, how much air is being sucked in by the engine
crankcase oil temperature - does the system need to be enriched for start up
throttle blade position - closed idle, mid throttle, wot & the throttle is pegged
air flow in CFM - cubic feet per minute - I don't think this system has this - my bike is still 2 weeks away
ECU - with a closed or open mapp - calibrated at the factory to pass emissions, etc
Lastly - a narrow or wide band O2 sensor, calibrated to 14.7 air fuel ratio, for the cat./emissions system
The ECU sends out a signal based on all those inputs, and opens the injector circuit for a predetermined pulse width
This bike having a narrow band O2 sensor just turns on & off sensing whether its at 14.7/1 or not.
The ECU sends out the same signal regardless of the size of hole in the injector, IE, rich fuel condition.
Without a wide band O2 sensor to monitor the mixture, or at least tell you whats going on, it's a crap shoot
I contacted my friends @ Dynojet this past week to see how far along they are on there PowerCommander for the Grom.
It's going to be a fairly simple box that can alter the mixture - lean/rich, @ idle/mid/top end
I do not know if it wil have a wide band O2 sensor
I'm putting my Grom on the dyno after it has 100 miles on it, & I'm welding a fitting, before the cat, for a wide band.
I'll have a much better idea of the workings of the system in about 3 or 4 weeks, and what it will take for modification
Hope this helps, more to come
Brian S
Highsider989 asked me if I would chime in on the large fuel injector that is available from Japan.
First, give me a second to let you know what I do. I work for one of the oldest & largest industrial engine manufacturers in the US. I'm presently working on their latest prototype engine program. I designed all the induction, including the cylinder head ports. I also am in charge of all the testing. My last project was their EFI engine, converted from carburation.
OK, so much for that:
All most all EFI systems monitor:
intake temperature, intake pressure and air density - what kind of day is it, IE, hot & muggy, cold & dry, how much air is being sucked in by the engine
crankcase oil temperature - does the system need to be enriched for start up
throttle blade position - closed idle, mid throttle, wot & the throttle is pegged
air flow in CFM - cubic feet per minute - I don't think this system has this - my bike is still 2 weeks away
ECU - with a closed or open mapp - calibrated at the factory to pass emissions, etc
Lastly - a narrow or wide band O2 sensor, calibrated to 14.7 air fuel ratio, for the cat./emissions system
The ECU sends out a signal based on all those inputs, and opens the injector circuit for a predetermined pulse width
This bike having a narrow band O2 sensor just turns on & off sensing whether its at 14.7/1 or not.
The ECU sends out the same signal regardless of the size of hole in the injector, IE, rich fuel condition.
Without a wide band O2 sensor to monitor the mixture, or at least tell you whats going on, it's a crap shoot
I contacted my friends @ Dynojet this past week to see how far along they are on there PowerCommander for the Grom.
It's going to be a fairly simple box that can alter the mixture - lean/rich, @ idle/mid/top end
I do not know if it wil have a wide band O2 sensor
I'm putting my Grom on the dyno after it has 100 miles on it, & I'm welding a fitting, before the cat, for a wide band.
I'll have a much better idea of the workings of the system in about 3 or 4 weeks, and what it will take for modification
Hope this helps, more to come
Brian S
