O2 sensor eliminator and Powercommander

Discussion in '6th Generation 2002-2013' started by kware4, Feb 7, 2011.

  1. havcar

    havcar New Member

    Joined:
    May 2, 2008
    Messages:
    1,266
    Likes Received:
    1
    Trophy Points:
    0
    Location:
    Denver CO
    Map
    I'm not sure as to why, but despite the fact that they themselves have designed and boxed a specific part, the VFR seems to be a major source of confusion for some.
     
  2. Spike

    Spike New Member

    Joined:
    Aug 26, 2006
    Messages:
    1,579
    Likes Received:
    2
    Trophy Points:
    0
    Uhhhh, pretty sure all the bikes, at least the VFRs, sold in the US have all been CA compliant for quite a while now. I think since at least version 6, but I am not sure, maybe version 5. Honda just decided it was easier as more states adopted the CA rules it wasn't worth them stocking 2 different versions and keeping track of them. Especially on a bike that isn't their biggest seller, and isn't an all out performance model.

     
  3. Spike

    Spike New Member

    Joined:
    Aug 26, 2006
    Messages:
    1,579
    Likes Received:
    2
    Trophy Points:
    0
    I can't remember exactly as it was several years ago that I did it, but it is real real easy. At least on the 04. Do you have access to a shop manual? The sensors screw into the stock muffler/header pipes. So you unscrew them, use a bolt to plug the hole (depending on your pipe) and then follow the wire from the actual sensor back to the wire harness where it has a plug type connection. Install the eliminators into the plug, on the side of the harness). Done, really it is easier than this makes it sound. For added protection, I covered the plug with electrical tape to keep water and debris out. But that could just be me over doing it.

     
  4. Spike

    Spike New Member

    Joined:
    Aug 26, 2006
    Messages:
    1,579
    Likes Received:
    2
    Trophy Points:
    0
    When I bought mine, it did not come with the eliminators. That may be a time issue, as I bought mine several years ago. It also did not come iwth the plugs for where you remove the 02 sensors from your pipes.

    I installed mine under my seat, way in the back near the tail light.

     
  5. CbusVFR

    CbusVFR New Member

    Joined:
    Apr 14, 2010
    Messages:
    7
    Likes Received:
    0
    Trophy Points:
    0
    I gutted my stock exhaust and the bike had a hesitation/sputter at light part throttle. I ordered and installed the PCIII and it didn't help. I installed the included O2 sensor eliminators with the PCIII and it cleared up. O2 elims really do make a difference.
     
  6. 04viffer

    04viffer New Member

    Joined:
    Aug 22, 2010
    Messages:
    104
    Likes Received:
    0
    Trophy Points:
    0
    sorry to bring up a old thread, but I have the opportunity to buy one of the older PCIII models for the 6th gen(111-210), what are the major differences in the older unit and the newer unit beside one being serial and the other being usb?
     
  7. Mohawk

    Mohawk New Member

    Joined:
    Jun 8, 2010
    Messages:
    559
    Likes Received:
    5
    Trophy Points:
    0
    Location:
    Bristol
    04viffer, the old serial units had less functionality, but as all of the USB upgrades (TPS, Accel, quick shifter etec) are NOT available for the VFR then there is NO practical difference other than the means to connect & update maps etc. The USB is great, as it gives you the PC3 interface on your laptop. I discovered that my rev counter was off by about 400rpm from this, so reset my idle using the PC3 readings on my laptop & its much better !

    With regards to the PC3 & O2 eliminators, you do NOT need O2 eliminators with PC3 as it is NOT a dynamic mapping system & the ECU will never fight with it. Obviously some people are not aware of how the PC3 works. It is a simple table based system that modifies the fuel injector firing signal from the ECU. For example if at 5000rpm the ECU sends a trigger with a value of 50 & from the dyno work the PC3 programmer saw that the bike was lean there, then the PC3 map may add to this signal, say 5, so the injector gets a 55 instead of a 50. thus adding more fuel. So that's the basic function & the PC3 allows you to alter the signal in 250rpm chunks by a + or - amount over what the ECU sent out.

    Now the O2 circuit on the VFR is ONLY active during cruise conditions, these are constant REV, constant Throttle position & only in the higher gears. When the O2 economy loop sensors kick in, if the ECU was sending 100 & the O2 sensor sees that the A/F ratio is rich, then the ECU will REDUCE its signal, say to 90 to try to reduce the A/F ratio to the ideal 14.7/1 as indicated by the O2 sensor. Now if you have a PC3 it may be adding to or reducing the signal from the ECU, but it will be doing so by a FIXED amount, regardless what the ECU sends. So if the ECU+PC3 signal was 95 instead of the 100 the ECU sent (PC3 reduced signal by 5), then the O2 sensors will still try to reduce the ECU signal to get to the ideal A/F ratio. So if the ECU reduces its signal to 90, then 85 is what the injector would see. i.e. ECU-5 (PC3 set to -5) thus 90-5=85 at the injector.

    This works fine on my 5th gen & improves the fuel economy when crusing. Unlike some people I have never had a cough, rough spot or surge when coming back on the throttle from cruise.

    So don't waste money buying O2 eliminators, unless you want to, they don't do anything, other than increase fuel burn at cruise, as the ECU still modifies the signal to the injector based on the eliminator, which should be set to emulate the ideal ratio. The only thing they really allow you to do is remove the O2 sensors from the exhaust ! but they don't come with bolts to plug the holes in the exhaust, so are pointless, IMO.
     
  8. jetdoc

    jetdoc New Member

    Joined:
    Feb 5, 2009
    Messages:
    54
    Likes Received:
    0
    Trophy Points:
    0
    I put a power commander 5 on my 07. It came with the 02 sensor eliminators, but fro about a hundred bucks more you can purchase an extra module and 2 02 sensors that adjust the fuel flow accurately to the map in the PC. I haven't bought that device yet, but I'm thinking about it.

    The eliminators are basically load resistors that just apply a certain constant resistance to the PC module.

    Cheers
    John
     
Related Topics

Share This Page