ninjette.org - View Single Post - Is the Power commander what I'm looking for?

DannoXYZ · May 13th, 2018, 10:47 PM

You're welcome!

I also forgot to mention that while older flow-based load-sensing algorithms such as AFM or MAF requires separate altitude sensor to make adjustments, MAP-sensing does it automatically!! At sea-level under WOT, MAP sensor would register about 100kpa and at 5500ft, it would measure around 80kpa and send that to ECU. The ECU would know that there's less air going into engine and will meter out the correct amount of fuel anyway.

At idle and partial-throttle, due to restriction of throttle-plate, intake-manifold will be under vacuum condtions and that won't vary as much with altitude. MAP sensor should be registring around 33-36kpa at idle. Verify that with vaccum gauge with T-connection at MAP-sensor nipple.

Even with carb, the 20% difference in fuel requirements wouldn't cause that much soot on your exhaust. Something's off.

If your bike is CA model, it will have an oxygen sensor. Make sure it's plugged in and not bypassed with resistor. If you have oscilloscope, you can also inspect output waveform of O2-sensor. Should be roughly +/- 0.4v sinewave above & below 0.485v.

Also check your TPS sensor. Measure output voltage and idle and WOT.

May 13th, 2018, 10:47 PM	#9
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	You're welcome! I also forgot to mention that while older flow-based load-sensing algorithms such as AFM or MAF requires separate altitude sensor to make adjustments, MAP-sensing does it automatically!! At sea-level under WOT, MAP sensor would register about 100kpa and at 5500ft, it would measure around 80kpa and send that to ECU. The ECU would know that there's less air going into engine and will meter out the correct amount of fuel anyway. At idle and partial-throttle, due to restriction of throttle-plate, intake-manifold will be under vacuum condtions and that won't vary as much with altitude. MAP sensor should be registring around 33-36kpa at idle. Verify that with vaccum gauge with T-connection at MAP-sensor nipple. Even with carb, the 20% difference in fuel requirements wouldn't cause that much soot on your exhaust. Something's off. If your bike is CA model, it will have an oxygen sensor. Make sure it's plugged in and not bypassed with resistor. If you have oscilloscope, you can also inspect output waveform of O2-sensor. Should be roughly +/- 0.4v sinewave above & below 0.485v. Also check your TPS sensor. Measure output voltage and idle and WOT.