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fuel controller advice

This is a discussion on fuel controller advice within the Grom Talk forums, part of the Honda Grom Forums category; Originally Posted by Old Goat Ninja I'm going to do a slight piggy back hijack on this thread. I'm ridiculously uneducated in this department. Stock ...

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  1. #21
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    Quote Originally Posted by Old Goat Ninja View Post
    I'm going to do a slight piggy back hijack on this thread. I'm ridiculously uneducated in this department.

    Stock bore, full exhaust, and intake, no more plans to anything performance wise to the engine, it sounds like Finbro ECU is a good choice? I don't know how to tune, etc. I could literally plug and play, or am I misunderstanding? Finbro ECU will tune itself to mods like exhaust and intake?
    Stock ECU should be fine too, its going to tune it to stoich, but meh. And if it does run over stoich/too lean, a bigger injector will fix this.
    Or Finbro, with a correctly sized injector. (putting a big one in with the stock ECU and the ecu will tune it correctly back to stoich too, except WOT will be very rich)
    Or an EFIE with stock. It will just reduce the AFR in the closed loop area and trick the ECU, much like the WB2's green wire does.
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    humilde_s13's Avatar
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    I'll run the finbro ecm on stock bore.


    #Aracer rc mini plus 2 #Takegawa 181cc #finbro 125cc head #yoshimura cam #koso 34mm tb #finbro 6 hole injector #brocks exhaust
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    Takegawa 181cc
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    Koso 34mm
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    Aracer rc mini plus 2

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    Quote Originally Posted by turpinator View Post
    Stock ECU should be fine too, its going to tune it to stoich, but meh. And if it does run over stoich/too lean, a bigger injector will fix this.
    Or Finbro, with a correctly sized injector. (putting a big one in with the stock ECU and the ecu will tune it correctly back to stoich too, except WOT will be very rich)
    Or an EFIE with stock. It will just reduce the AFR in the closed loop area and trick the ECU, much like the WB2's green wire does.
    Forgot all about the EFIE.
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  5. #24
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    Ive got one that ill be selling in the next week, if anyone wants it, or wants to call dibs on.

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    going efie on my ktm here soon, too bad I already bought one. natch.
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    Doesn't modifying the O2 signal (EFIE) eventually allow the stock ECU to tune the open loop areas as well?
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  9. #28
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    Nope. Theres no feedback, which is why its called open loop.

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    That's what im talkin' bout.

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    Quote Originally Posted by turpinator View Post
    Nope. Theres no feedback, which is why its called open loop.
    I thought I read on this forum that several people have confirmed that the closed loop "information" (using that loosely, but guessing that it could be TPS voltage, injector duty cycle, etc) eventually tunes the open loop to close the gap (piggyback tuner thread?). IMO this sort of defeats the purpose of "open loop," but I would love to know more.

    EDIT: EFIE Fuel Management
    and original post I was referring to: O2 sensor on the Grom and piggyback tuners
    Last edited by nnamssorxela; 01-11-2017 at 02:42 PM.
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