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Thread: rancher programmer?

  1. #1
    Join Date
    Dec 2008
    Location
    denham springs, la
    Posts
    11

    rancher programmer?

    anyone know if you need a programmer to go along with a hmf exhaust on a 07 rancher with efi? i was told that all i had to do was unplug negative terminal on battery and let computer reset so when you plug it back up it will learn the new exhaust flow. is that true?
    07 rancher 420
    2" high lifter kit
    27" mud lites
    14" itp ss112

  2. #2
    Join Date
    Dec 2008
    Location
    denham springs, la
    Posts
    11
    damn is this place dead or what? only 8 views and no replies.
    07 rancher 420
    2" high lifter kit
    27" mud lites
    14" itp ss112

  3. #3
    Join Date
    Dec 2007
    Posts
    183
    You are going to need a programmer to make any changes. The FI system does not compensate for things like an aftermarket exhaust. You may want to install the exhaust and see how it runs first. I wouldn't expect to see any performance gains unless you get it properly tuned. Get yourself a Power Commander.

  4. #4
    Join Date
    Oct 2001
    Location
    Indianola Iowa
    Posts
    9,242
    I agree the EFI system used on atvs do not have wide band O2 sensors in them. You will need a programmer I would use the power commander
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  5. #5
    Join Date
    Dec 2008
    Location
    denham springs, la
    Posts
    11
    ok. i have had several people tell me 2 different things. i just talked to a mechanic at the local dealer and he told me that all you have to do is unhook the negative terminal on battery and it will reset computer and it will learn the new air flow. and i am not looking for performance gains, i just liek the lower tone.
    07 rancher 420
    2" high lifter kit
    27" mud lites
    14" itp ss112

  6. #6
    Join Date
    Jan 2006
    Location
    Vernon, BC
    Posts
    99
    Whats better the dynojet power commander or the hmf efi optimizer?
    2004 Honda 450R

    2007 Honda 420 (Rancher)

  7. #7
    Join Date
    Sep 2005
    Location
    Chicora, PA
    Posts
    481
    Originally posted by littlebigman
    ok. i have had several people tell me 2 different things. i just talked to a mechanic at the local dealer and he told me that all you have to do is unhook the negative terminal on battery and it will reset computer and it will learn the new air flow. and i am not looking for performance gains, i just liek the lower tone.
    I dont understand how that would work on an open loop (non O2 sensor) efi system. get a power commander and know that its done correctly.
    08 yz450
    Originally posted by JR3
    im the white quad version so im just as cool

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