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DannoXYZ · April 11th, 2018, 09:02 AM

If you've got more ignition-advance than stock, I'd bump up octane-rating. It's actually the other way around, with higher-octane fuels, you can run more ignition-advance for more power. This allows the entire air-fuel mixture to be combusted and exerting maximum-pressure closer to piston's TDC position to extract as much expansion power as possible. This optimum point is about 18-degrees ATDC, but in practice, ignition isn't advanced enough and we get 25-30 ATDC for safety from the manufacturers.

Easy way to find flow-rate of injectors is to pull them and look at part#. Stock 300 injectors are:

Kawasaki# 49033-0558
Denso# EAT-811
Flow = 175cc/min @ 43psi

RC Injection's website has handy calculators to let you play "what ifs" with injector sizing. Above injectors will support 53bhp @ 80% duty-cycle.

Note Power Commander will only allow you to adjust fuel-injector duty-cycles only so much away from stock. If you change injector-sizes, best to re-flash the ECU to incorporate new injector-size into baseline map. Or go with aftermarket standalone EFI system.

BTW - anyone know if the 300 gets 3D ignition maps that also accounts for load rather than simple 2D RPM-based one from 250?

April 11th, 2018, 09:02 AM	#18
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	If you've got more ignition-advance than stock, I'd bump up octane-rating. It's actually the other way around, with higher-octane fuels, you can run more ignition-advance for more power. This allows the entire air-fuel mixture to be combusted and exerting maximum-pressure closer to piston's TDC position to extract as much expansion power as possible. This optimum point is about 18-degrees ATDC, but in practice, ignition isn't advanced enough and we get 25-30 ATDC for safety from the manufacturers. Easy way to find flow-rate of injectors is to pull them and look at part#. Stock 300 injectors are: Kawasaki# 49033-0558 Denso# EAT-811 Flow = 175cc/min @ 43psi RC Injection's website has handy calculators to let you play "what ifs" with injector sizing. Above injectors will support 53bhp @ 80% duty-cycle. Note Power Commander will only allow you to adjust fuel-injector duty-cycles only so much away from stock. If you change injector-sizes, best to re-flash the ECU to incorporate new injector-size into baseline map. Or go with aftermarket standalone EFI system. BTW - anyone know if the 300 gets 3D ignition maps that also accounts for load rather than simple 2D RPM-based one from 250? Last futzed with by DannoXYZ; April 11th, 2018 at 10:26 AM.