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  1. #1
    rrt898's Avatar
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    EFI Controller...2005 GP1300R

    I have a 2005 GP1300R. I just had my entire engine rebuilt from the crank up. I did install higher compression heads, 4* keyway, air cleaner, reed stuffers, and a D-plate and exhaust. All the other parts are OEM from Yamaha. My mechanic doesn't want me to install an EFI controller. He doesn't like them. The shop did warranty the engine but; from everything I read I would think I need one.

    Any thoughts????


  2. #2
    logan9806's Avatar
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    Yes with the higher compression head and the keyway you need one I wouldn't chance it !! Just did this my self. Higher compression more heat need more fuel to cool it down read through some of the stickes on here there is one called when do I need a efi tuner there is some good info there.

  3. #3
    powerstroke specialist mikegp's Avatar
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    Quote Originally Posted by rrt898 View Post
    I have a 2005 GP1300R. I just had my entire engine rebuilt from the crank up. I did install higher compression heads, 4* keyway, air cleaner, reed stuffers, and a D-plate and exhaust. All the other parts are OEM from Yamaha. My mechanic doesn't want me to install an EFI controller. He doesn't like them. The shop did warranty the engine but; from everything I read I would think I need one.

    Any thoughts????
    your mechanic don't want to install a efi cont? how does he plan to increase fuel delivery ? . if he can answer this one let us know please..
    now seriously , do not run that engine w/o one , it will not pass go and will not collect $200

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  5. #5
    rrt898's Avatar
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    I guess I am buying an EFI Controller...........

  6. #6
    steach's Avatar
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    Quote Originally Posted by mikegp View Post
    your mechanic don't want to install a efi cont? how does he plan to increase fuel delivery ? . if he can answer this one let us know please..
    now seriously , do not run that engine w/o one , it will not pass go and will not collect $200
    -1 I'm on your mechanic's side on this one.

    This engine screams for higher(highest) octane fuel but not necessarily more fuel...at full throttle. The EFI will only smooth out the transition from 3.5k - 5,000 rpm.

    If you notice a big stumble when pulling WOT from 4k R's than the EFI will help. (mainly shows up while jumping wakes)
    -If I was to warranty your engine I would also ask you not to use it, cause they can fail and cause big trouble. (worse than if it wasn't there at all)

    Drain ANY old fuel, fill her up with 93 and let it rip....following his break-in recommendations.

  7. #7
    powerstroke specialist mikegp's Avatar
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    Quote Originally Posted by steach View Post
    Quote Originally Posted by mikegp View Post
    your mechanic don't want to install a efi cont? how does he plan to increase fuel delivery ? . if he can answer this one let us know please..
    now seriously , do not run that engine w/o one , it will not pass go and will not collect $200
    -1 I'm on your mechanic's side on this one.

    This engine screams for higher(highest) octane fuel but not necessarily more fuel...at full throttle. The EFI will only smooth out the transition from 3.5k - 5,000 rpm.

    If you notice a big stumble when pulling WOT from 4k R's than the EFI will help. (mainly shows up while jumping wakes)
    -If I was to warranty your engine I would also ask you not to use it, cause they can fail and cause big trouble. (worse than if it wasn't there at all)

    Drain ANY old fuel, fill her up with 93 and let it rip....following his break-in recommendations.
    so you are basically telling him there is no need for one using high compression heads and 4* keyway?
    OK that's fine . rrt go ahead and just take it for a nice cruise around 4500 to 5000 rpms and you will see whats going to happen. just get back with us please and let us know.
    the people who actually play with this things while we were playing video games , have mention 100 times that you will need one if you increase comp or advance timing.

  8. #8
    powerstroke specialist mikegp's Avatar
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    again this is from rossnemo.

    Exactly right JKR, thats why in my post i listed a controller as required after any compression or timing keyway mods. They increase cylinder temps dramatically and the added fuel is necessary to cool the burn, especially in the midrange. Pistonwash can be used as a general indicator, but the wash left is from the entire rpm band, from idle to 7300 rpm. You can be ok at idle, and ok at WOT, but lean in the midrange and not know it till its too late. 1220 egt degrees at 4400 rpm, and 1065 degrees at 7150 rpm.. Huge difference, and those numbers once again are with the efi controller running at 5-6 on the midrange pot, on a non ported 1300.

  9. #9
    powerstroke specialist mikegp's Avatar
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    and this from WFO. to my opinion one of the best.

    At the request of one of the top tuners on the forum, me and Rossnemo have decided to put up some threads about the Riva and R&D EFI controllers. Hopefully this will help people decide what settings to use and when a controller is actually needed. Settings vary from boat to boat, but hopefully some of this info will be a good starting point. This info is from my personal experience and not just "I read somewhere" facts.

    The Riva controller has 3 mixture settings (idle/midrange/high speed) and a crossover setting. You should read the dials like you read a clock. Also read the controller with the wires coming out of the right side. Top dial is idle circuit.

    -First off when is a controller really needed ?
    Contrary to popular belief, you do not need a controller when adding an air filter or freeflow exhaust. The WOT fuel mapping is pretty rich already on top end from the factory. This also applies when installing a D-plate, an aftermarket prop, a rideplate or any aftermarket handling parts.

    -Do I need one when adding just aftermarket reeds ?
    Reeds help with air/fuel delivery. I feel a controller is really not needed for WOT circuit, but I do recommend adding one with aftermarket reeds because it helps smooth out midrange circuit.

    -Do I need one with higher compression ?
    Yes recommended

    -Do I need a controller when installing just a Jetworks modifiction ?
    Not at all

    -Do I need a controller with a keyway ?
    We have run a stock 06 with just a 3degree keyway with no EFI controller and had no problems. Pistonwash looked fine.

    -Do I need a controller with porting ?
    Absolutely. Porting an engine is when you really need the controller the most. Obviously along with porting you will add compression, aftermarket reeds, exhaust freeflow, and air filter.

    Lets look at some combinations...
    -Aftermarket air filter and freeflow- no controller needed
    -Milled head, air filter, freeflow- yes recommended
    -Air filter and reeds- not needed but recommended
    -Milled head, reeds, airfilter, freeflow- yes needed
    -Milled head, air filter, advance timing keyway- yes needed
    -Porting with all the goodies- yes needed

  10. #10
    Happily Self-Employed WFO's Avatar
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    Im afraid it will be a little lean in the midrange with out a controller

    -Milled head, air filter, advance timing keyway-

    also the biggie is that the fuel that is available now sucks compared to years ago when we did all our testing

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