08 Roadstar, running Cobra pipes and Hypercharger intake. I installed a Power Commander when I put the pipes on. Ended up taking it off because I couldn't get it to run right. I explained this in another section of the forum but didn't get any hits on it. Maybe someone can help me this time. I took it off before because the motor surged or felt like it was sputtering when I held the throttle in one spot. If I run the bike through the gears it doesn't do it. I only does it when the throttle is held in one spot. It feels like one cylinder was not firing all the time. I took it off and the bike ran fine with just the pipes. Just recently put on the Hypercharger and put the Power Commander back on. It still does the surging but I found if I hold the throttle and let it surge, after approximately 30 seconds the motor starts running fine. It feels like the computer made an adjustment. If the bike cools off and I ride again, it goes through the same procedure. Sometimes it takes longer to "smooth out".

I haven't tried it without the Power Commander since I put the Hypercharger on. I was told I HAD to reprogram the motor with the Hypercharger because of the larger air flow. I am just guessing, but the problem feels electrical. I checked the throttle sensor connector and it is tight. The directions on the Commander say to disconnect the fuel sensors on the pipes. I have them disconnected but was wondering if that was a place to start. Does anyone know if I plug the sensors back on the pipes will it damage the on board computer with the power commander installed? Or will it damage the Power Commander? I have e mailed Power Commander and waiting for a respnse. Wanted to see what anyone has to say here.

I have the Power Commander set for my year and model bike with modified exhaust and intake.

Larry

Have you tried disconnecting the battery for a while and then reconnecting it again to see if it resets itself?

did you put the o2 sensors in the new pipes?

I don't know about the hypercharger but I put a K&N BAK on my '08 and after the computer remapped to it automatically (took about 3 seconds), it's run great since. No PC and I do have the O2 sensors hooked up in my Speedstar Dragster pipes.

I have not disconnected the battery since hooking the PC up. It was disconnected while I was hooking it up. But, I'll try this when I get home.

Yes, the o2 sensors are in the pipes. I disconnected them at the electrical connections, as called for in the PC directions.

Larry

power commander seems to be screwing things up... the whole point of the sensors is to let the computer know what the air fuel ratio is... so the computer can adjust the injection to match based on acceleration and cruising.. I would try and run just the factory box and see how it runs...

unless PowerCommander has a fix for you sounds like they have not done the research well or some place in china mislabeled the switch settings and the instructions.

would make me crazy thats for sure...

Good Luck and keep us posted as to the outcome.

bowhunter4265 wrote:
power commander seems to be screwing things up... the whole point of the sensors is to let the computer know what the air fuel ratio is... so the computer can adjust the injection to match based on acceleration and cruising.. I would try and run just the factory box and see how it runs...

unless PowerCommander has a fix for you sounds like they have not done the research well or some place in china mislabeled the switch settings and the instructions.

would make me crazy thats for sure...

Good Luck and keep us posted as to the outcome.

Yep, kind of sounds like the surging is the computer searching for something that is not there (O2 Sensors). After many attempts to read the O2 in the exhaust gases, the computer sets for what is there and disregards what is not there. Next startup initializes another search and it does it again. I would hook those back up and see how it does.

I don't think it's the O2 sensors myself. Power Commander knows what they are doing. I just wonder if you are using the right map ? If so have you tried to adjust it a bit ? I had mine installed by my dealer after I down loaded the map for HardKrome 3" drags and then tweeked it a bit since my bike has the Road Burner 3" pipes. It was running a bit too rich at first but after leaning the first pod about three ticks the bike is running very strong and getting in the low 40's on gas. No surging at all.
Hope this helps
Scooper

I'm not sure why they would advise disconnecting the 02 sensors...

Remember: PCIII is really only there to compensate if there's an issue. Not really a requirement if the bike runs fine without it. Right?

Just my .02


Rich

Okay, here's the fix everyone. Thanks for all the info....
1st I took the PC off just to see how the bike ran and if it surged. The battery is disconnected each time I do this, so the on board computer is reseting. The bike ran fine without the PC, with the Hypercharger and pipes. No surging at all.
I couldn't leave well enough alone, so I put the PC back on being very careful that each connection is tight and fully connected. What Road_Hawg said made sense to me so I wanted to hook the o2 sensor's up and see what happens. I tried the different maps, and tried going to the different extreme's on the PC just to see if there was any effect at all on the surging. No change, so again it made sense what Road Hawg says. I contacted PC (they are very helpful) and they told me to hook the o2 sensors back up on the pipes, it wouldn't hurt the PC. That was the trick. The motor's power band is VERY SMOOTH and starts lower in the RPM's. Very happy.
I contacted PC and told them the results. Haven't heard back from them yet. The instructions clearly say to remove the o2 sensors. I will be waiting for my check for the R&D testing I did for them. I'll share the wealth with everyone that helped.

Thanks again
Larry