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Aftermarket ecu

This is a discussion on Aftermarket ecu within the Monkey Talk forums, part of the Honda Monkey 125 Forums category; Originally Posted by Wibbly the stock o2 sensor cannot report that AFR yuminashi is likely just loading an open loop map in these ECUs, hence ...

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  1. #21
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    Quote Originally Posted by Wibbly View Post
    the stock o2 sensor cannot report that AFR


    yuminashi is likely just loading an open loop map in these ECUs, hence the "you must install the right injector" because the ECU cannot actually verify the AFRs and adjust pulse widths. because of this they depend on a larger injector to deliver more fuel, instead of the ECU adjusting pulse widths (it can't, because it is without feedback)


    using the stock o2 sensor the ECU can only tune to stoich. their "target AFRs" in open loop will be based on their mapping. the stock grom ECU does the same.
    Could they just be using the stoich voltage of the narrowband o2 sensor to equal 13.2:1 instead of 14.7:1 in the ecu then when it goes rich/lean it tunes back to the 13.2:1 (kind of simulated stoich if you catch my drift) or are you saying it’s just like using a pcv without the wb2 so anything under 60% would be 14.7:1 then over 60% it would go to 13.2:1?


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  2. #22
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    Quote Originally Posted by Wibbly View Post
    you must install the right injector
    With regard to that, you have to change injectors with any ecu if you’re going bbk due to maxing our the duty cycle of the injector, you wouldn’t get far with a full on 210 with aracer rc1 ecu and a stock injector.


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  3. #23
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    The sensor cannot report 13.2. It can only change state (voltage) between low and high. It doesn't sit at a voltage at stoich it switches. There's a very narrow window there hence the name of the sensor.

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  5. #24
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    Quote Originally Posted by Parksie View Post
    With regard to that, you have to change injectors with any ecu if you’re going bbk due to maxing our the duty cycle of the injector, you wouldn’t get far with a full on 210 with aracer rc1 ecu and a stock injector.


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    Yes of course, however I still very much doubt the ecu is adjusting injector pulse widths to achieve 13.2 afr with feedback. It can't happen with the standard sensors.

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    I believe that the Hoedar stand-alone ecu is able to use the stock o2 sensor, how would that be any different to this?


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    A narrowband o2 sensor cannot report actual afrs.

    If you offset the voltages that does not give you actual afrs, it gives you a "richer than stoich" or "leaner than stoich". Not actual.


    This is why companies use wideband sensors. They can tune to actual values.



    Without proper feedback, a control loop cannot match the output to the setpoint.

    The feedback from the narrowband is two values very near stoich. One above and one below. By fueling such that time spent above equals time spent below, then averaging the output, the computer can figure out what value produces stoich.


    If the feedback to the ecm does not indicate actual AFR, then the system cannot output to actual AFR.

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    The factory ECU is "self learning" just as much as these yuminashi ones. In fact I doubt they changed the open loop fuel maping and even if they did, there would be a very small chance that it would be the correct map for the exact modifications that have been done to one's bike. I think the term "self learning" is a bit vague.
    Wibbly likes this.
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  9. #28
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    Awesome info. Thanks, now I understand a little more. I was drawn to dynojet, but it seems Aracer is the choice of the super high performance guys. I said seems, I know some of the heavy hitters use dynojet. The local dyno is dynojet, but I am going to get the RC1, their AF1 autotune, and the iMode. Should I install the 181 neo first? Problem is, I want my bbk afr to be correct from day one so I might want the aftermarket ecu to be up n running. Btw, I am looking for contrary opinions. I like the Pod 300.

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    I've been riding around all day running errands and the engine revs a freer at high rpms, likely because it's getting more fuel at high rpms. Overall the throttle is more crisp and responsive even at low rpms, probably from the different ignition timing curve. The bike keeps up with traffic easier without having to wring out the engine. Comparing the Yuminashi to the stock ECU, it seemed to have been holding back the engine at high rpms. It took a few cold starts and about 60 miles of riding for it to dial itself in. During that time the engine ran weak, but that quickly passed. I'm quite pleased with how this is working out. Still running the modified stock exhaust on it for this week to log some gas mileage. It makes a nice compact little package tucked under the engine with nothing sticking out anywhere. I like it.

    Aftermarket ecu-rzl9rgc.jpg

    Aftermarket ecu-uf01ukz.jpg



    After that I'll put the TOCE exhaust back on to see what happens with it.
    Last edited by tooter; 04-01-2019 at 06:49 PM.
    2018 GROM: Modified for reliability longevity gas mileage... and fun.

  11. #30
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    Thanks for posting. How much re-pinning was involved? I am tempted, but then I am planning on going to an Aracer in a few months. I have an aftermarket pipe and the chimera intake. I am running 16f and 32r sprockets. And a lot of expensive stuff that doesn’t make it faster.

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