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Differences between the new Yuminashi ECU and Finbro’s ECU ?

This is a discussion on Differences between the new Yuminashi ECU and Finbro’s ECU ? within the Grom Performance forums, part of the Honda Grom Garage category; Originally Posted by CiscoSanJose I would not sweat my balls over the internet gurus who are well versed in any topic, I had the same ...

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Thread: Differences between the new Yuminashi ECU and Finbro’s ECU ?

  1. #21
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    Quote Originally Posted by CiscoSanJose View Post
    I would not sweat my balls over the internet gurus who are well versed in any topic, I had the same problem when I was DIY testing my groms back in 2014-15 time frame trying to make it run faster or better. I always had members who are smarter than me tell me I was wrong or doing something wrong or posting facts and such. Yes some of the data they spooled were true, but in the real world testing you have variables that could and will change your final out come.

    For me I just ride, DIY testing, change things and see what works and what doesn't and yes sometimes things break, blowup, but the learning curve is always changing.

    Just ride it like you stole it and have fun and piss off the cagers and other MC that think you are riding a toy.

    Ride safe
    Thanks, man.
    I'm the same. My own actual experience is my guide. I'm always experimenting... like this long intake I modified for more low rpm torque.


    -sbmovbz.jpg

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    I'm averaging 139 mpg because I don't need to rev up the engine so much to get the bike moving.
    Last edited by tooter; 04-04-2019 at 11:08 AM.
    2018 GROM:
    TOCE Dual Exhaust
    Yuminashi ECU
    TST Rear Fender Eliminator
    TST Taillight +Signal Lights
    TST Front Signal Lights
    Dinger Built Extra Long Intake
    Honda Monkey Rear Sets
    Honda Monkey Front Fender
    Honda Monkey Fork Guards
    Honda Black Plastics
    G Craft Rear Rack
    Cargo Crate

  2. #22
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    i drug mine out from the warehouse today with this ecu and the PCV/WB2 at work over lunch. populated the less than 80% portion of the PCV table to 12.9 afr just to see if it would map to it, it does. rode around for about 35 minutes. was wathing the gauge adjust and the trim tables populated under 80%. The 80-100% were mapping just fine like a stock ecu with a pcv. target is set to 12.2 at 100%

    when it was set to zero in that range, it ran to about 13-13.2 on the afr gauge but then i think the pcv was fighting the ecu and it just kept getting richer over time before.

    considering nobody on here actually knows 100% what the mods to the ecu programs were, this is def one of the times testing is needed to verify.

    It DOES run warmer with this ecu though, so i am sure it has an aggressive timing table.
    tooter and Djezspin like this.
    Too many toys? nah. 09 Ducati sport classic, 74 rd350 LC hybrid, 73 RD350, 73 Kawasaki S2a, 67 Kawasaki C2TR 120 Roadrunner, 71 Kawasaki G3SS powered by a CR85 liquid cooled lump, 74 Moto-Morini 3 1/2 strada, 84 Yamaha RZ350, 1962 Ford falcon, 76 Ford maverick, very early 1970 non-us Spec Yamaha R5, 89 Yamaha DT50 bought NEW in 2015, 2015 KTM 390 Duke, 72 yamaha CS5.. . oh.. and 2014 Honda Grom with lots of mods.. (some useful, most not)

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    Hold on let this old curmudgeon get his popcorn. Greetings from the Florida Keys to all the heavy hitters AND our troll. Wanna race? Stock 125cc, 16 front 32 rear. Getting the Neo 181 and Aracer RC1, AF1, and iMode next. And some Michelins.
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    Quote Originally Posted by m in sc View Post
    It DOES run warmer with this ecu though, so i am sure it has an aggressive timing table.
    Funny, I just noticed something similar today...
    After a trip to town and back, I put my hand on the TOCE muffler and it was hotter, I almost couldn't keep my hand on it even though the ambient temp is cool. Normally it would just be warm to the touch with the stock ECU. I can also tell the ignition advance curve is different from the way the throttle responds. When I swapped out exhausts yesterday from the modified stock cat to the TOCE, I didn't have to do anything. The ECU adjusted for the difference in engine operating parameters.


    Cold starts are just a little different because there's no fast idle function. During cranking I manually crack open the throttle just a little bit and then let go once the engine starts. Then even cold it idles fine without dying.

    All in all, I'm pleased with the performance of the Yuminashi.
    Last edited by tooter; 04-04-2019 at 06:55 PM.
    2018 GROM:
    TOCE Dual Exhaust
    Yuminashi ECU
    TST Rear Fender Eliminator
    TST Taillight +Signal Lights
    TST Front Signal Lights
    Dinger Built Extra Long Intake
    Honda Monkey Rear Sets
    Honda Monkey Front Fender
    Honda Monkey Fork Guards
    Honda Black Plastics
    G Craft Rear Rack
    Cargo Crate

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    My friend and I have identical mods, he has the Yuminashi and I have the Finbro ECU. In a few hundred more miles when his is mapped a bit better I will report back the results. As of now I cruise about 65 pretty easily and can get to 70-73 tucked regularly. Rad hose intake, cheap thai yoshi exhaust, 150 injector, TB cam, and the ECUs
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    fyi, dead cold motor start this morning. yuminashi ecu, pcv and wb2 on 1704v. excuse the pollen. http://www.2strokeworld.net/wp-conte...10_0927141.mp4
    shush319 likes this.
    Too many toys? nah. 09 Ducati sport classic, 74 rd350 LC hybrid, 73 RD350, 73 Kawasaki S2a, 67 Kawasaki C2TR 120 Roadrunner, 71 Kawasaki G3SS powered by a CR85 liquid cooled lump, 74 Moto-Morini 3 1/2 strada, 84 Yamaha RZ350, 1962 Ford falcon, 76 Ford maverick, very early 1970 non-us Spec Yamaha R5, 89 Yamaha DT50 bought NEW in 2015, 2015 KTM 390 Duke, 72 yamaha CS5.. . oh.. and 2014 Honda Grom with lots of mods.. (some useful, most not)

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    Quote Originally Posted by m in sc View Post
    fyi, dead cold motor start this morning. yuminashi ecu, pcv and wb2 on 1704v. excuse the pollen. http://www.2strokeworld.net/wp-conte...10_0927141.mp4
    wonder why your A/F gauge reads 10 on startup first start, my Aracer gauge reads 11.2 and jumps around until warmup where it goes 13.2

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    because, i have it set to not auto tune for initial fire up. power commander setting. you had one, you should know this.
    Too many toys? nah. 09 Ducati sport classic, 74 rd350 LC hybrid, 73 RD350, 73 Kawasaki S2a, 67 Kawasaki C2TR 120 Roadrunner, 71 Kawasaki G3SS powered by a CR85 liquid cooled lump, 74 Moto-Morini 3 1/2 strada, 84 Yamaha RZ350, 1962 Ford falcon, 76 Ford maverick, very early 1970 non-us Spec Yamaha R5, 89 Yamaha DT50 bought NEW in 2015, 2015 KTM 390 Duke, 72 yamaha CS5.. . oh.. and 2014 Honda Grom with lots of mods.. (some useful, most not)

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    Quote Originally Posted by m in sc View Post
    fyi, dead cold motor start this morning. yuminashi ecu, pcv and wb2 on 1704v. excuse the pollen. http://www.2strokeworld.net/wp-conte...10_0927141.mp4

    Started easier than I thought. Appreciate the vid. That 1704V sounds nasty!

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    Quote Originally Posted by c0rkscrew View Post
    My friend and I have identical mods, he has the Yuminashi and I have the Finbro ECU. In a few hundred more miles when his is mapped a bit better I will report back the results. As of now I cruise about 65 pretty easily and can get to 70-73 tucked regularly. Rad hose intake, cheap thai yoshi exhaust, 150 injector, TB cam, and the ECUs
    I'm not so sure Finbro and Yuminashi might not be the same product, or at least very similar. Since mine has set itself, the engine cold starts really easy now with no throttle input. And even though there's no fast idle, it doesn't die.
    2018 GROM:
    TOCE Dual Exhaust
    Yuminashi ECU
    TST Rear Fender Eliminator
    TST Taillight +Signal Lights
    TST Front Signal Lights
    Dinger Built Extra Long Intake
    Honda Monkey Rear Sets
    Honda Monkey Front Fender
    Honda Monkey Fork Guards
    Honda Black Plastics
    G Craft Rear Rack
    Cargo Crate

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