External tuners like the PCV and others will have a go between the O2 sensors and ECU, or a plug that plugs into the wiring harness for the O2 sensor that basically tells the ECU that the O2 is there and the mixtures are fine.

 

PVCX from Fuel moto plugs into diagnostic port and downloads existing files. You then use USB to download that info to your computer. Send the file to Fuelmoto, they make whatever changes you want according to what you have done to your bike (exhaust, cam, etc) and send it back. Use USB to download file onto your PVCX. Then plug it back into the diagnostic port and download new file. Unplug and ride.

 

He doesn't have O2 sensors that is why he is using the PCV. The PVCX uses the O2 sensors for closed loop operation. Now the PVCX can be tunes to not utilize closed loop, but I have yet to see any that ave completely done that yet.

 

Fm told me they can make a map, but it is sort of eliminating a lot of the benefit of the pvcx. This is why i think pcv is the way to go. I dont really intend on adding any more performance parts, and even if i do a $200 tune isnt the worst thing in the world.

Am i understanding all this correctly though? With no o2 sensors the better option is the pcv?

 

Yes

Fm told me they can make a map, but it is sort of eliminating a lot of the benefit of the pvcx. This is why i think pcv is the way to go. I dont really intend on adding any more performance parts, and even if i do a $200 tune isnt the worst thing in the world.

Am i understanding all this correctly though? With no o2 sensors the better option is the pcv?

Yes, The PCV will properly tune your basic fuel and timing tables and comes with plugs (inserted into your wiring harness connectors) to eliminate the oxygen sensors. I originally used the PCV on my bike and found it easy enough to view and adjust my various tables with a laptop computer. I did not completely know what I was doing with it, but Fuel Moto was a great resource and provided excellent assistance.

 

seems I missed this one. Yes, the PVCX can be used easily without the factory closed loop operation ... in open loop all the time. The ECU runs in closed loop everywhere where the Main Target AFR table carries 14.7 cell values.
So ... putting e.g. 13.8 into all those cells forces the ECU out of closed loop (ignoring the stock narrowband O2 readings). BUT:

To do that a clear warning has to be issued:
- you risk running your engine with completely wrong fuelling which can range from overly rich in the 11s to far to lean in the 16s plus). During our tuning sessions we have witnessed the factory preset VE table being not so accurate in all those areas where closed loop (dynamic correction through O2 sensor data) was expected before! In other words: You need at least wide band O2s and a WBCX to MONITOR and dial in the fuelling. I would never run my skoot blindly in open loop.
- despite having eventually eliminated closed loop operation of the ECU ... you would still need the eliminator plugs (or the factory narrowband sensors still plugged into the harness) to avoid CELs. The VCM/ECU on startup do all kinds of checks on the status of sensors, and the eliminator plugs help fooling the ECU in this regard.
- your fuel economy in "open loop all the time" will never be the same as with wisely preset closed loop areas
- There is no power benefit in running COMPLETELY in open loop with AFRs below 14.7. You can set the idle to low load cruise ranges to closed loop 14.7 (saving fuel) and as soon you slightly twist that throttle your operation jumps to the the higher load open loop areas (where you gave some more fuel).

The only reason I am running completely in open loop is because I came off a PCV (comes with the eliminator plugs!) with dual channel AutoTune (comes with wide band O2s). I ditched the factory narrow bands a couple of years back and welded the 18mm wide band bungs at exactly the same position.

BEST is you have both: the stock narrowbands in place (to selectively keep closed loop in certain areas) and the added benefit of wide bands (WBCX) to do the right tuning tuning for the other areas! (plus there are some more advantages of the narrow bands during tuning ...)

BTW: The PCV is cheating. While the ECU thinks it is in closed loop it actually is NOT. The eliminator plugs do not only avoid tripping CELs but provide constant/same readings all the time. So ... having your PCV tune correct (not only on WOT) is critical for the sane operation of your beloved engine! (Depends on the dynotime the operator invests to cover all areas, not only the areas for the nice peak numbers run!)

i learned today that as of January 1, 2018 DynoJet no longer sells or ships O2 eliminators. F.....

 

You can make your own if you cannot find them elsewhere. You will need the generic physical plastic plugs with internal connections plus a resistor for each one.