alright guys i know this is prolly a noob question but i am a noob lol... anyways here is the deal, i have a 2006 f4i and it comes stock with a 02 sensor. well, the o2 sensor is bad. i am ordering a new exhaust in the next couple of weeks and was thinking about running the o2 eliminator from dynojet but i have some mixed info about it. i have read that it will make ur bike run perfect and other info says that it will make ur bike run lean causing ur plugs to foul rather badly. any information on this situation would be very helpful.

 

You shouldn't have any plug fouling issues but a lot of people noticed a drop in mpg when they eliminated the O2 sensor.

 

Your spending money to either fix it or eliminate it so why not just fix it?

 

the reason i would want to replace it is becuase its $20 to eliminate it and $50 for a new sensor. and how much of a mpg drop are we talking about?

 

20-30 miles per tank is what I've read, that's if you fill up when the reserve light comes on I think. I'd just replace the sensor if I was you.

 

Yeah, if it wasnt going to be much of a drop I was not going to worry about it but after hearing that I'll just stick with fixing it.... However, eventually I want to get a pc3 on my bike and that requires o2 sensor elimination correct? And lets also hope my new slip on that I just ordered has a bung for my o2 sensor

 

That's what it says on their site, keep in mind the pc3 will kill your mileage as well.

 

I don't understand why a pc3 would kill ur mpg cause it makes ur air to fuel ratio perfect .... If u get it set right

 

Factory you bike is lean. Lean means not enough fuel, which means better gas mileage.

 

I have a 2006 with a PCIII USB (just installed the other day), stock exhaust and O2 sensor.

Just read this on another site: Honda CBR 1000RR - Power Commander III USB
The stock ECU is designed to meet EPA requirements and runs very lean in the lower RPM ranges and then becomes rich in the upper RPM ranges. Getting the proper amount of fuel and air to the combustion process at the proper throttle position and RPM is paramount to performance.

I can't verify this for sure, but I can tell you that when I popped a wideband O2 sensor in my old Saturn, basically the same thing was happening with the stock PCM/ECU. Low RPMs were lean and high RPMs were rich. I have no idea what tuners and or the PC maps aim for in the A/F ratio at low RPMs or partial throttle, but I know that 13:1 is approximately/usually the target A/F ratio for most bikes for making power. I also want to make note that the majority of the time, during normal driving under partial throttle conditions (in the car), A/F ratios were very close to stoichiometric. I would be willing to bet that the same happens for our bikes, or maybe a bit richer, but probably not close to 13:1 under partial throttle and it probably dumps too much gas at WOT.

With that being said it would seem to me that you might get a tad better gas mileage at the track and or when you're driving like an *******. On the other hand you would probably see less gas mileage under normal riding with a PC in general.

Either way, I would keep the sensor. If the rumors are true about reduced gas mileage, it will be worth it to keep the sensor.

I will monitor my mileage and make a guesstimate over the next week.