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the new 'yuminashi' ecu and PCV/WB install/ initial test

This is a discussion on the new 'yuminashi' ecu and PCV/WB install/ initial test within the Grom Performance forums, part of the Honda Grom Garage category; Originally Posted by m in sc So, i got the motor settled back and wanted to experiment with that yuminashi/keihin 'plug and play' ecu that ...

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Thread: the new 'yuminashi' ecu and PCV/WB install/ initial test

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    Quote Originally Posted by m in sc View Post
    So, i got the motor settled back and wanted to experiment with that yuminashi/keihin 'plug and play' ecu that was mentioned a few weeks ago.

    I stuffed it in and set the timing to zero on the PCV as i have no idea what the curve is on the new unit. fired it up and left the same fuel trims in the PCV as was in there with the old (stock) ecu.

    Initially, it ran really rich. since the new ecu i am sure had a richer afr target, this made sense. so i set the cells across the board int eh auto tune trim tables to -5, and it then at least got rideable.

    I have to say, the ecu learned very quickly. in the closed loop , the afrs were at 13-13.2 and hit targets in open loop very fast. The bike ran smoother as well, somewhat, and was atad more responsive. since there's no rev limiter in the ecu anymore, i set the fuel tables at 11k and up to 11 to act as a soft limiter, and retarded the timing back 3 degrees.

    I need to get the idle sorted a bit, seems ok but not perfect, but thats about the only complaint so far.

    my plan is to see if the PCV can now be used to tune the cells from 0-60 and not fight the ecu. i'm not sure. i'll get a solid map done, than test this later. BUT, the PCV/WB2 does play with the yuminashi/keihin ecu. IF it can do the closed loop area now as well, us legacy power commander users can now get full tunability in the full range of the map.

    considering the -5 setting in the auto tune helped it settle done initially, i'm guessing it might actually work.
    Hoping this works out good. If so, I'll be buying one to add to my BBK I'll be doing here shortly.
    2017 Grom
    Koso 4V GF Ported / Drowsports 181 piston / Takegawa Oil Pump, Cam Chain Tensioner, Crank Support Kit & Catch Can
    Koso 34mm TB GF Ported / DynoJet PCV, WB2 & AFR / GF Manual Cam Chain Adjuster
    Drow Sports CF Intake & Oil Cooler / Hindle Exhaust / OPMID 2 Temp Gauge
    Kitaco Clutch Cover / SMR 6 Disc Clutch & 60% Springs / Chimera Clutch Plate
    RacingBros Adj Fork Kit and Shicane HLR Shock / Vagabond Fender Eliminator
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  2. #12
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    I was wondering about this ECU as well. Didn't even occur to me to run it with the power commander. Did you disconnect your WB2 from the PCV and stock O2 wire so you can monitor AFR and be truly free of the PCV playing with the closed loop range, or how did you set it up?
    Takegawa 12.5:1 Piston
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    I run my Yuminashi ECU stand alone with nothing else... and it works great.
    2018 GROM: Modified for reliability longevity gas mileage... and fun.

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  5. #14
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    Quote Originally Posted by tooter View Post
    I run my Yuminashi ECU stand alone with nothing else... and it works great.
    Aaaand?
    Takegawa 12.5:1 Piston
    Ported Head w/ TB valves
    2" Intake w/UNI filter
    DanMoto conical exhaust (no kidding)


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    conclusions without measurements or any empirical evidence whatsoever. this is great info.

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    Quote Originally Posted by estallings15 View Post
    Aaaand?
    I'm just running an open intake and open exhaust so I got it to make sure the engine gets enough fuel. It's about half the price of a Finbro, doesn't have any cold starting issues like the Finbro, and it never needs resetting for changes like the stock ECU. I threw away my set of bent paperclips. (lol) Right now my gas mileage average with the Yuminashi is 141.1 mpg.
    Last edited by tooter; 04-17-2019 at 05:47 PM.
    2018 GROM: Modified for reliability longevity gas mileage... and fun.

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    Quote Originally Posted by tooter View Post
    I'm just running an open intake and open exhaust so I got it to make sure the engine gets enough fuel. It's about half the price of a Finbro, doesn't have any cold starting issues like the Finbro, and it never needs resetting for changes like the stock ECU. I threw away my set of bent paperclips. (lol) Right now my gas mileage average with the Yuminashi is 141.1 mpg.
    It sounds perfect for your setup. Not being able to adjust it makes it not very useful for high comp builds. They're a bit...sensituve. OP is trying to see if those of us with PCV's can get the best of both worlds by using the PCV to further fine tune it, which would be amazing. I hate my power commander. Haha.
    tooter likes this.
    Takegawa 12.5:1 Piston
    Ported Head w/ TB valves
    2" Intake w/UNI filter
    DanMoto conical exhaust (no kidding)


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    Quote Originally Posted by Wibbly View Post
    conclusions...
    What's that sound?... it's just the Quibbler.

    The Quibbler returns... the new 'yuminashi' ecu and PCV/WB install/ initial test-thequibbler.jpg
    2018 GROM: Modified for reliability longevity gas mileage... and fun.

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    when your posts become anything but self indulgent and useless i'll back off. but as of now pretty well all your content is either meaningless or misplaced. so we'll consider this your fault.

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    Quote Originally Posted by estallings15 View Post
    It sounds perfect for your setup. Not being able to adjust it makes it not very useful for high comp builds. They're a bit...sensituve. OP is trying to see if those of us with PCV's can get the best of both worlds by using the PCV to further fine tune it, which would be amazing. I hate my power commander. Haha.
    Im running a finbo ecu on my high compression 125 build and it rips, I imagine that the yuminashi would be about the same but with the cold start function working.
    2015 Grom - High Compression 125 Build
    2018 Grom - 143cc BigBore
    1986 Spree - 70cc BigBore
    2017 DRZ400SM

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