Power comander, o2 eliminator, function.

Recently installed a PCV onto my 6th gen. I was disappointed to find that that eliminators are not included anymore do to legality or liability and emissions. Obviously this didnt stop me me from seeing what if any gains I would get. Running a map from dynojets website i immediately noticed more pull in wide open throttle.

Now for my interest; its said that the o2 sensors must be eliminated or the ecu will trim the fuel and negate the gains from the module. But from what I've read this is generally the case while throttle and/or rpm are constant. So why then does it matter if the ecu leans during steady rpm or throttle? I guess I dont have an intimate understanding of fuel mapping and ecu management but it seems to me if the bike leans out and loses power when I'm cruising down the road I can care less. I want power when I'm accelerating. Not like we are trucks hauling/towing tonnage up hills or are fighting the massive drag a rig encounters on the road.

I guess my question is, besides creating a static fueling map rather than dynamic as is the case with the o2 enabled and the obvious benefits that has in terms of creating the actual tune, why not just leave them?

Next is a curiosity of mine. Again, limited knowledge on the ecu. But our o2 cheaters serve only to put resistance in the o2 heater circuit so as the ecu doesn't throw a code and recognize the o2 as missing. Because of this the sensor side, left open, never sends a voltage to the ecu. As it reads 0.00v it believes the mix is either rich or lean (I cant remember) and try's to adjust accordingly. But after sever minutes with the bike adding or trimming and no change to the input voltage the ecu falls back into a medium fuel trim. Here's where I understand we then tune from. This gives the static fuel mapping we need. I'm curious if this happens every time we start the bike?

Lastly and most practical in nature; without any real benefit to physical removal of the o2 sensors and given they dont come included with the pcv anymore, could we not yield the same end result as the eliminator by simply cutting the sensor wires and leaving the heater wires intact? The eliminator simply plugs into the empty connector left by the sensor. It's just a 330 ohm resistor. But if we cut the sensor feeds and leave the heater feeds then the ecu still recognizes the sensor and still faults to a static median fuel trim.

I suppose the eliminator allows us to use headers that are not equipped with the bungs. And perhaps theoretically there might be a negligible increase in exhaust flow as the sensors are not in the flow path. Hell, its technically weight savings... but otherwise, it's free, leaves the bike intact for visual inspection if anyone has to deal with that.

Unless someone can offer me a reason it's not recommended I think I may try this myself. Perhaps someone already has.

 

All I know is from previous bikes, 02 sensor was left disconnected so it didn't try to "correct" the Dynojet map you loaded/made yourself. You want to use that map exclusively? I do not know the effect of putting a resistor in the heater circuit except to perhaps fool it that it is already warmed up and 02 not needed?

 

I understood that the eliminators, resistors simply allowed the ecu to see something working in the circuit that belongs in the circuit and not go default or trouble map. I ran PCv with just the O2 heater wires for awhile with no ill effect.

When I went to autotune is when I added the eliminators & put in 2 wideband O2s, 1 for autotune (which i love!) And 1 for an AFR guage.

 

Ok, so if I just cut the sensor wires and leave the o2 otherwise installed I can essentially yield the same results as the cheaters then correct?

 

Why cut? Unplug instead. As I said, I can't tell you what eliminators do. Try it both ways if you like and see what the results are, but I wouldn't snip wires.

 

The ecu does have to see resistance on the heaters or it thinks the sensor is MIA. I don't honestly remember which wires but that's easy enough to look up.

You can still buy eliminators online for "off road use only".

 

If I unplug the ecu with throw a code. Not sure if it would run a safety map and reduce power. If I leave the heater and cut (I think) I'll bet the same result as the elim. Maybe I'm lazy or I just dont wanna wait lol. Not sure. I've sunk 3k into the bike since I bought it with upgrades and an my anal retentive need to rid it of any and every seemingly insignificant issue I've found or thought it might have.

It's my first bike and at the moment my singular transportation until I can finally get to the dmv. Given me a chance to really understand the workings of the bike and know what each component "feels" like when I'm riding. I'm very familiar with cars and heavy trucks but I have a much greater appreciation and sense of urgency when things dont feel right on the bike.

 

Best bet until research is done and parts in hand is to leave the sensors alone for now. PCv does improve things even with the sensors intact.

 

All you need to make your own elims are two 330 ohm resistors, 1/2 watt or more - a couple of bucks. I ran them for over 30,000 miles, no issues. Better yet, bin the PC and get a Rapid Bike racing module. It tunes the AFR on the fly using stock O2 sensors. Comes pre-loaded with a suitable map which it then tunes to your particular bike. Make mods and it automatically adjusts. No need to worry about which fixed map to load. RB leaves PC in the dust.