[Rosco]

Hi all,

I was wondering if anyone out there knows what the target voltage the stock ECU is looking for from the O2 sensor.

After looking through some threads on this site it seems that it has been found that Power Commanders or other piggy back devices will not work below 5200rpm and/or 19% throttle.

It bugs me to have to buy a race ECU as well as an aftermarket device to allow full tuning of my own bike without specialist devices and dealers.

I assume the Duc ECU like most FI systems when in a “closed loop” mode uses either a default or last saved map from memory then fine tunes its mixture to hit a specified voltage from the O2 sensor.

I am thinking that plugging a simple dummy load on the O2 cable that would present the correct voltage/resistance to the ECU will force the system to hold the map and prevent any error massages from having the sensor unplugged.

Wouldn’t it be nice to only have to buy a Power Commander or similar device, put a terminating plug on the O2 sensor and have any competent tuner with a dyno or yourself do the tuning?

If anyone has any info, ideas or criticisms I am happy to listen.

As my bike is still a couple of weeks away I haven’t had a chance to play around yet.

Cheers
Ross

 

[jlrogers]

rapid bike makes a module already for elimination of the sensor. i think it is like $60.

 

[Dan Kyle]

Hi all,

I was wondering if anyone out there knows what the target voltage the stock ECU is looking for from the O2 sensor.

After looking through some threads on this site it seems that it has been found that Power Commanders or other piggy back devices will not work below 5200rpm and/or 19% throttle.

It bugs me to have to buy a race ECU as well as an aftermarket device to allow full tuning of my own bike without specialist devices and dealers.

I assume the Duc ECU like most FI systems when in a “closed loop” mode uses either a default or last saved map from memory then fine tunes its mixture to hit a specified voltage from the O2 sensor.

I am thinking that plugging a simple dummy load on the O2 cable that would present the correct voltage/resistance to the ECU will force the system to hold the map and prevent any error massages from having the sensor unplugged.




Cheers
Ross

Nope it does not work that way, and it is not simple. And that is why the Rapid bike part will not work correctly. Turning off the light does not make it work correctly.

The O2 sensor is tied to the ECU, the ECU sends bursts of fuel out and if the ECU does not respond to these bursts of fuel correctly it sends more bursts looking for a correct responce.
Since it is not a constant a simple plug in showing one return signal all the time does not work.

You will need a Race ECU or some other complete ECU replacement to use the Power Commander below 5500RPM/17% throttle position.

 

[Rosco]

Thanks for the advice guys,

Looks like I may have to start hunting for a price on a Nemesis ECU.

Cheers
Ross