ninjette.org - View Single Post - Fuel injected 08-11 ninja250r help

DannoXYZ · October 11th, 2020, 05:42 PM

This is 2 independent settings:

1. Idle-screw should be set so engine has factory idle-speed. Around 1300-1400rpms or so

2. Injector turn-on RPM. When you close-throttle, most ECUs turns off fuel momentarily. Then as engine speed slows to certain RPM, ECU turns injectors again to give engine “soft landing” to idle speed. Factory ECU has this programmed around 3500 RPMs.

Issue is you now have something in intake blocking air-flow. This causes engine to decelerate faster than stock when you close throttle. So it’s best to re-program this injector turn-on setting to higher RPM so engine doesn’t drop too far before injectors are brought back online. Any aftermarket programmable EFI system like Mega/Microsquirt, Electromotive, MoTeC, etc. will allow setting this to any RPM you want.

Also due to less flow than stock at lowest load row on 3D map, you may be too rich there. Try reducing fuel in lowest-load row in 5% increments to see if behavior changes. If it gets worse, then adjust in other direction.

Other thing to check is if TPS’s idle switch makes contact properly when you close throttle.

October 11th, 2020, 05:42 PM	#12
DannoXYZ ninjette.org certified postwhore Name: AKA JacRyann Location: Mesa, AZ Join Date: Dec 2011 Motorcycle(s): CB125T CBR250R-MC19 CBR250RR-MC22 NSR350R-MC21 VF500F CBR600RR SFV650 VFR750F R1M ST1300PA Valkyrie-F6C Posts: A lot. MOTY - 2018, MOTM - Nov '17	This is 2 independent settings: 1. Idle-screw should be set so engine has factory idle-speed. Around 1300-1400rpms or so 2. Injector turn-on RPM. When you close-throttle, most ECUs turns off fuel momentarily. Then as engine speed slows to certain RPM, ECU turns injectors again to give engine “soft landing” to idle speed. Factory ECU has this programmed around 3500 RPMs. Issue is you now have something in intake blocking air-flow. This causes engine to decelerate faster than stock when you close throttle. So it’s best to re-program this injector turn-on setting to higher RPM so engine doesn’t drop too far before injectors are brought back online. Any aftermarket programmable EFI system like Mega/Microsquirt, Electromotive, MoTeC, etc. will allow setting this to any RPM you want. Also due to less flow than stock at lowest load row on 3D map, you may be too rich there. Try reducing fuel in lowest-load row in 5% increments to see if behavior changes. If it gets worse, then adjust in other direction. Other thing to check is if TPS’s idle switch makes contact properly when you close throttle. Last futzed with by DannoXYZ; October 11th, 2020 at 07:14 PM.