Muzzy 4 into 2 into 1 Exhaust with Power commander

[Fergi]

I am getting conflicting information between the Muzzy exhaust system tech support and their counterparts at Dynojet (Power Commander). Muzzy provides a boss on their header that accommodates the O2 sensor for the ’08 FJR1300 ECU and they are advising me to hook the O2 sensor to the header.

Dynojet has the following statement in their installation instruction:

Note: It is recommended to disconnect the stock O2 sensor to get the full potential

out of the bike and the Power Commander. Follow the wires coming out of your

exhaust and disconnect these wires where it goes into the main wiring harness.

I called Dynojet and talked to their tech support. They confirmed that they think I should not install the O2 sensor on the Muzzy header. The tech support guy told me that if I installed the O2 sensor that the ECU would revert to the stock fuel curve at or near idle and it would not run as well. One of the main reasons that I am installing the Power Commander is to improve the off idle performance of the bike.

Just wondered if anyone else has had this problem?

 

[Wicked Webby]

I am getting conflicting information between the Muzzy exhaust system tech support and their counterparts at Dynojet (Power Commander). Muzzy provides a boss on their header that accommodates the O2 sensor for the ’08 FJR1300 ECU and they are advising me to hook the O2 sensor to the header.
Dynojet has the following statement in their installation instruction:

Note: It is recommended to disconnect the stock O2 sensor to get the full potential

out of the bike and the Power Commander. Follow the wires coming out of your

exhaust and disconnect these wires where it goes into the main wiring harness.

I called Dynojet and talked to their tech support. They confirmed that they think I should not install the O2 sensor on the Muzzy header. The tech support guy told me that if I installed the O2 sensor that the ECU would revert to the stock fuel curve at or near idle and it would not run as well. One of the main reasons that I am installing the Power Commander is to improve the off idle performance of the bike.

Just wondered if anyone else has had this problem?

Fergi,

If your tuned properly, no need for the 02 sensor.

WW

 

[exskibum]

I got the same conflicting info for my '05 with the map that Muzzy supplied for the PCIII. I went ahead and connected the O2 sensor in the pipe and left the leads to it connected. My bike runs great AND I don't get error messages in the diagnostic readout as I've heard others who have disconnected the O2 sensor do.

On the other hand, I've never had any problem with my bike lurching or surging off idle from the time it was new until I put the Muzzy on 2 years later or afterwards. For whatever it may be worth, I installed the slightly more restrictive "quiet core" in my Muzzy can at the time I installed the system and the PCIII. My power is up and mpg down with the header and PCIII, but I can't say how much of either is due to the longer injection pulses from the PCIII at idle or above.

I would love to hear a definitive answer on this issue one day, though.

 

[Feejer/Weejer man]

All Gen 1 should disconnect the O2 sensor with the PCIII. Plus block the AIS or remove completely which is more difficult and unnecessary. I have a Holeshot full system with the PCIII and a custom map done by Dale Walker and his mechanic on a dyno. All I can say is unbelievable.

 

[Fergi]

After sending Muzzy the following excerpt from the Power Commander installation instructions:

Note: It is recommended to disconnect the stock O2 sensor to get the full potential

out of the bike and the Power Commander. Follow the wires coming out of your

exhaust and disconnect these wires where it goes into the main wiring harness.

I got the following email from Muzzy:

John

08-19-08

I would go with the recommendations from Dynajet.The exhaust was built to accommodate the stock set up.

Muzzy Sales & Technical

I guess that answers my question. Thanks for all your responses.

 

[Bigtime]

Think about it - the O2 sensor works with the ECU as a closed loop system to control fueling and emissions. Now you want to add a PC3 to remap the ECU and control the A/F characteristics of the bike. Do you see the conflict here? Get rid of the O2 sensor.

 

[Geezer]

I run the Muzzy with no PCIII and I have the O2 sensor connected. I believe the ECU needs the input from the O2 sensor in order to compensate for the change in exhaust system, though that compensation is probably minimal. The Muzzy really has nothing to do with the issue of the O2 sensor, it is the PCIII and map that manages the fuel such that you can leave out the sensor. So, I would go with the recommendation from the people who make the PCIII.

 

[Fergi]

I run the Muzzy with no PCIII and I have the O2 sensor connected. I believe the ECU needs the input from the O2 sensor in order to compensate for the change in exhaust system, though that compensation is probably minimal. The Muzzy really has nothing to do with the issue of the O2 sensor, it is the PCIII and map that manages the fuel such that you can leave out the sensor. So, I would go with the recommendation from the people who make the PCIII.

Thanks for your input Geezer, it's confusing when the people who are providing you with the fuel map (Muzzy) are also advising you to do something contraire to the PCIII manufacturer instructions.

 

[I'mAllIn]

I have the same set-up. Put the O2 sensor in (to fill the boss) and unplug it. Load the Wally Smoothness / Holeshot combo map and try to keep that **** eatin' grin off your face!