GMan Bully 2011 C50T - Page 2 - Suzuki Volusia Forums : Intruder Volusia and Boulevard Forum
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post #11 of 19 (permalink) Old 10-25-2012, 03:38 AM
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Disconnected the O2 sensor and yes the FI light cam on.
Eventually found the ECU and pulled out Pin 23 as per your diagram and taped it up. FI light out.
So far so good.

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post #12 of 19 (permalink) Old 12-06-2012, 09:10 PM
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Originally Posted by WabRida View Post
Hey Ozrider, looks like I have to also disable the O2 Sendor. Do you have any pics or more info on where the plug you mentioned is located and if it is the same for a 2008 C50?

Also, your post mentiones that your "disabling the FI Warning light" WHen I installed the GMan bully, the FI warning light doesnt come on. I havent yet noticed any increase or decrease in power with the bully so I presume its due to the O2 sensor as you mentioned, but I dont have an issue with the FI warning light.

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That would be because the O2 sensors are telling the ECM to subtract fuel the Bully is adding. Sort of fighting each other. Sorry, but those O2 sensors have to go off line.
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post #13 of 19 (permalink) Old 12-06-2012, 09:11 PM
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Oops...missed your last post.

Hey, I've done that before. Nothing a little walking away and settling down doesn't usually fix though. Congrats!

BTW, you needn't ever worry about calling Gman (Gary) for help. Few know our bikes as well as he does and he's very personable. He's also Pacific West Coast time. Gman Industries rates in the tops for me!

Glad you got it figured out.
You are too kind, but still a learning process on them there 'Down Under' Bikes. They have a 4 wire O2 sensor, nothing like overkill!
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post #14 of 19 (permalink) Old 02-10-2013, 09:08 PM
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That would be because the O2 sensors are telling the ECM to subtract fuel the Bully is adding. Sort of fighting each other. Sorry, but those O2 sensors have to go off line.
Gman, I am just about to fit your Bully controller on an Australian delivered M50.
I am asking this question as a general post rather than a PM, as it may help other members.

When you say the O2 sensors 'have to go off line', I have already disabled the pair valve using Moccs kit. I gather I have to pull the pin on plug #23 when fitting the GMan Bully processor. Is that correct? Thank you

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post #15 of 19 (permalink) Old 02-13-2013, 01:02 PM
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Gman, I am just about to fit your Bully controller on an Australian delivered M50.
I am asking this question as a general post rather than a PM, as it may help other members.

When you say the O2 sensors 'have to go off line', I have already disabled the pair valve using Moccs kit. I gather I have to pull the pin on plug #23 when fitting the GMan Bully processor. Is that correct? Thank you
I believe so form what I am reading. The O2 sensor needs to be disabled or it will remove the fuel the Bully is adding and net you less than favorable results. Only the California version of the C50's have O2 sensors and they are a 2 wire version, while yours seem to be a 4 wire version. Go figure.....we are on the same planet are we not??????? LOL
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post #16 of 19 (permalink) Old 02-13-2013, 02:49 PM
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The difference between 2 wire and 4 wire sensors is the 4 wire sensors have a heating element to make them function sooner. Don't have too wait for the Exhaust to Heat up the O2 sensor with the 4 wire heating element.

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post #17 of 19 (permalink) Old 02-13-2013, 04:12 PM
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GMan - have you come up with a solution for the Cali version with the O2 sensor?


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post #18 of 19 (permalink) Old 02-13-2013, 05:30 PM
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My quess is the O2 sensor produces a specified voltage when the O2 level in the exhaust is good. If the above is correct the best solution would be a fixed voltage to simulate a good O2 reading. Rather than just disabling the FI Fuel Injection warnings light. The FI warning light might still be useful for other warnings rather than not indicating a defect from no reading from the O2 sensor.

With a definite system fault (and a good O2 sensor) an engine running lean will cause the sensor to swing around a relatively low voltage (0.2V) and richness will cause the output voltage to swing high (0.8V) If no faults are present and everything is operating correctly the output will rapidly swing between 0V and 1V.

All O2 sensors are vented to the atmosphere which contains Approximately 21% oxygen. The exhaust of a gasoline Powered engine typically contains up to 2% oxygen. The Sensor's output voltage depends on the oxygen content of the exhaust stream. That is, if the exhaust has 2% oxygen, it is lean. This produces a low voltage, below .3 volt (300 millivolts). If the exhaust has near 0% oxygen, it is rich. This produces a high voltage, above .6 volt (600 millivolts). These voltages are sent to the computer and it reacts by adjusting the air/fuel ratio. This is commonly known as the O2 feedback system and when this system is operating it is said to be in "closed loop".

http://www.ibmwr.org/ktech/O2-sensor-testing.shtml
http://www.therangerstation.com/tech.../O2Sensors.htm

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Last edited by Two Red Ryders; 02-13-2013 at 06:14 PM.
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post #19 of 19 (permalink) Old 02-14-2013, 03:47 AM
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Thanks GMan and thanks 2RR for the helpful explanation.
To me, it seems the 02 sensors employ a great deal of technical sophistication to achieve what amounts to a marginal difference in output.

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