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Has anyone here done the ECU reflash for the Grom from DHMotoring? I've been looking around but haven't heard peoples reviews or thoughts about the reflash. Just wondering if it has made the bike feel any different.
 

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for me I say you would be better off finding a used PCV with WB02 or get a used Aracer mini 2+ because you can tune to the various type of hardware you buy for your grom, or buy a Finbro ECU.

Here is the info on their website and only works on OG ECU, but can be used with SF grom with I guess some wire changes

We're now officially offering an ECU flashing service for your Honda Grom! Our stage 1 software cleans up the air/fuel ratio and optimizes ignition timing on bikes with intake and exhaust modifications.Looking at the dyno graph, you'll see the blue and green lines that are the graphs for the stock, unmodified ECU. It runs extremely lean up top and therefore only makes around 6-7HP at 9200rpm. By controlling the air/fuel ratio we're able to extract up to 3HP more in the higher RPMs. The peak number is only about 1hp but in a race on the street the tuned bike will continue to pull gear after gear because it does not lose power after 7,000rpm.Our ECU flash not only increases horsepower, but it also makes the engine run safer now that it has adequate fueling. We've also calibrated the flash so that it is still perfectly safe to run with 87 octane fuel!***This is the best alternative to a fuel controller, especially at the price point. You no longer need to spend hundreds of dollars on a tuner if you only have simple bolt-ons on your bike. If your bike is running a modified intake and exhaust this is your ticket to a smooth running bike with OEM like ride-ability. Since we retain the stock ECU, the bike will start, run and idle like normal, but will produce more and safer power throughout the rev range.

The bottom line: Up to a 3HP gain compared to an untuned ECU!
How to order:Currently this service is only available for the OG ECUs, ending in part number 911 (All US-spec OGs have this ECU). If your Grom is an SF, we can provide instructions on how to retrofit the OG ECU in to your SF. It's a simple process that takes about 5 minutes once you've removed your side fairing.The price for the stage 1 reflash is $105 which includes return shipping to you in the United States. You will need to send us your ECU and we will flash it and get it back in the mail by the following business day (1-day turnaround time). If you do not wish to have the downtime, I can provide a core flashed ECU to you. You will have to pay a $100 core charge which will be refunded once you send your original ECU back.If we revise the stage 1 software in the future we will update your ECU for free (you just pay shipping both ways). If you'd like to update to a different setup later on (big bore, cam, etc) we only charge a $35 upgrade fee which includes return shipping to you as well.
 

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I have been wondering the same thing. Given that the stock engine only makes about 9 HP, I would think that an ECU swap-out which results in a power increase approaching 3 more HP would be a very dramatic change indeed. Even 1 HP (at peak) should be quite noticeable.

I have been cautiously waiting -- considering the idea of placing an order -- but I wanted to hear from a few other early-adopters first. If this proves to be valid, it seems like this is the easiest significant performance upgrade ever......weird that there has been so little discussion.
 

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David Is on this forum also, I believe he is flashing the sf ecus now also.

Im not running one of his flashed ecus, but I am running one of his high compressing 125 pistons, and he's going to be building me a large valve head soon. Hes a great guy and very easy to work with.
 

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for me I say you would be better off finding a used PCV with WB02 or get a used Aracer mini 2+ because you can tune to the various type of hardware you buy for your grom, or buy a Finbro ECU.

Here is the info on their website and only works on OG ECU, but can be used with SF grom with I guess some wire changes

We're now officially offering an ECU flashing service for your Honda Grom! Our stage 1 software cleans up the air/fuel ratio and optimizes ignition timing on bikes with intake and exhaust modifications.Looking at the dyno graph, you'll see the blue and green lines that are the graphs for the stock, unmodified ECU. It runs extremely lean up top and therefore only makes around 6-7HP at 9200rpm. By controlling the air/fuel ratio we're able to extract up to 3HP more in the higher RPMs. The peak number is only about 1hp but in a race on the street the tuned bike will continue to pull gear after gear because it does not lose power after 7,000rpm.Our ECU flash not only increases horsepower, but it also makes the engine run safer now that it has adequate fueling. We've also calibrated the flash so that it is still perfectly safe to run with 87 octane fuel!***This is the best alternative to a fuel controller, especially at the price point. You no longer need to spend hundreds of dollars on a tuner if you only have simple bolt-ons on your bike. If your bike is running a modified intake and exhaust this is your ticket to a smooth running bike with OEM like ride-ability. Since we retain the stock ECU, the bike will start, run and idle like normal, but will produce more and safer power throughout the rev range.

The bottom line: Up to a 3HP gain compared to an untuned ECU!
How to order:Currently this service is only available for the OG ECUs, ending in part number 911 (All US-spec OGs have this ECU). If your Grom is an SF, we can provide instructions on how to retrofit the OG ECU in to your SF. It's a simple process that takes about 5 minutes once you've removed your side fairing.The price for the stage 1 reflash is $105 which includes return shipping to you in the United States. You will need to send us your ECU and we will flash it and get it back in the mail by the following business day (1-day turnaround time). If you do not wish to have the downtime, I can provide a core flashed ECU to you. You will have to pay a $100 core charge which will be refunded once you send your original ECU back.If we revise the stage 1 software in the future we will update your ECU for free (you just pay shipping both ways). If you'd like to update to a different setup later on (big bore, cam, etc) we only charge a $35 upgrade fee which includes return shipping to you as well.
The aRacer is a more complete and powerful option, but it is a bit more expensive.

That data is actually a little old, I am now capable of flashing all Grom ECUs, including the 2017-2019 and can now extend the rev limiter as well.

The 3HP is number is not a peak number, the peak gain was only 1hp, but at high RPM the difference is nearly 3hp. I'll get the site updated tonight.
 

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That data is actually a little old, I am now capable of flashing all Grom ECUs, including the 2017-2019 and can now extend the rev limiter as well.
That's great news, well done!

Any chance you could flash EURO ecus? Part number 38770-K26-931
 

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....I am now capable of flashing all Grom ECUs, including the 2017-2019 and can now extend the rev limiter as well.

The 3HP is number is not a peak number, the peak gain was only 1hp, but at high RPM the difference is nearly 3hp. I'll get the site updated tonight.
This is indeed wonderful news. I plan on sending you my ECU in the very near future.
 

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Hope to have the DHM 186 tune on a 2018 ECU in the next couple of weeks. *crosses fingers*
 

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......I am now capable of flashing all Grom ECUs, including the 2017-2019 and can now extend the rev limiter as well.
David,
I would like to send you my Grom ECU for a re-flash. My Grom, however, is a 2017, so I have the "SF" version. Your website currently indicates that you are only re-flashing the OG series ECUs.........I am just wanting to confirm details before I send in my SF ECU. Any guidance is appreciated.
Paul
 

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David,
I would like to send you my Grom ECU for a re-flash. My Grom, however, is a 2017, so I have the "SF" version. Your website currently indicates that you are only re-flashing the OG series ECUs.........I am just wanting to confirm details before I send in my SF ECU. Any guidance is appreciated.
Paul
Hi Paul, I just updated the site to reflect the current offerings. I can flash the 2017 for you.
 

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The aRacer is a more complete and powerful option, but it is a bit more expensive.

That data is actually a little old, I am now capable of flashing all Grom ECUs, including the 2017-2019 and can now extend the rev limiter as well.

The 3HP is number is not a peak number, the peak gain was only 1hp, but at high RPM the difference is nearly 3hp. I'll get the site updated tonight.
I am super curious to your ECU reflash. I currently run the finbro ecu, and while it has done well with my 164cc bbk, big valve head, kitaco type 2 cam, and CBR150R injector, it does have its shortcomings.

Does your ECU reflash retain the automatic cold start enrichment / high idle solenoid? Proper use of the Intake Air temp sensor (which the finbro ecu does not)? Ability to reset the ecu (like stock)? Throw engine codes like stock? ability to set initial starting altitude map like the stock ecu? Retain kickstand safety shutoff?

Sorry for all the questions, but those are my gripes with the finbro ecu and if your ecu reflash can be done and still retain those stock functions and say set the revlimiter to 10.2K rpms, and simply work with a bbk with a proper sized injector ALA finbro ecu style.... IM SO DOWN!
 

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I am super curious to your ECU reflash. I currently run the finbro ecu, and while it has done well with my 164cc bbk, big valve head, kitaco type 2 cam, and CBR150R injector, it does have its shortcomings.

Does your ECU reflash retain the automatic cold start enrichment / high idle solenoid? Proper use of the Intake Air temp sensor (which the finbro ecu does not)? Ability to reset the ecu (like stock)? Throw engine codes like stock? ability to set initial starting altitude map like the stock ecu? Retain kickstand safety shutoff?

Sorry for all the questions, but those are my gripes with the finbro ecu and if your ecu reflash can be done and still retain those stock functions and say set the revlimiter to 10.2K rpms, and simply work with a bbk with a proper sized injector ALA finbro ecu style.... IM SO DOWN!
If I remember correctly back in 2015-16 time frame I meet a grom rider from San Francisco who was using the Finbro ECU with WB02 unit and was able to run his grom engine pretty good. That was be another option.
 

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I am super curious to your ECU reflash. I currently run the finbro ecu, and while it has done well with my 164cc bbk, big valve head, kitaco type 2 cam, and CBR150R injector, it does have its shortcomings.

Does your ECU reflash retain the automatic cold start enrichment / high idle solenoid? Proper use of the Intake Air temp sensor (which the finbro ecu does not)? Ability to reset the ecu (like stock)? Throw engine codes like stock? ability to set initial starting altitude map like the stock ecu? Retain kickstand safety shutoff?

Sorry for all the questions, but those are my gripes with the finbro ecu and if your ecu reflash can be done and still retain those stock functions and say set the revlimiter to 10.2K rpms, and simply work with a bbk with a proper sized injector ALA finbro ecu style.... IM SO DOWN!
Yes. I'm just calibrating the maps within the stock ecu, so all of the functions remain the same (cold start, check engine light, kickstand safety, altitude settings, etc.). Do you have a wideband gauge installed?
 

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Yes. I'm just calibrating the maps within the stock ecu, so all of the functions remain the same (cold start, check engine light, kickstand safety, altitude settings, etc.). Do you have a wideband gauge installed?

Oh man thats awesome. I have really wanted to retain the stock functionality for a just get on a go ride.

I do not have a wideband installed as the finbro ecu i currently run has done a good job of keeping things fueled proper enough.


Does the 186 kit have a different flash vs your standard flash? If not it sounds like your standard flash with say a PCX injector for my 164 kit would work well as it should be plenty of injector and be able to trim down.
 

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I'll just keep spamming... lol
I have sent US spec ECUs to Australia and the UK and they have confirmed to function just fine, but I have not tried to reflash one here before. If you'd like to purchase a core and try it in your bike we can definitely work something out.

Oh man thats awesome. I have really wanted to retain the stock functionality for a just get on a go ride.

I do not have a wideband installed as the finbro ecu i currently run has done a good job of keeping things fueled proper enough.


Does the 186 kit have a different flash vs your standard flash? If not it sounds like your standard flash with say a PCX injector for my 164 kit would work well as it should be plenty of injector and be able to trim down.
Yes the fuel curve of the 186 is much different than a stock bore flash. I actually don't have a "standard" map that I send everyone unless they have a basic intake/exhaust. I have different files built for different cams, etc. For example, the fuel curve for a Hindle pipe is much different than it is for a Yoshi/2bros/Akra since it's so big and doesn't make any sort of torque in the lower rpm range.

I couldn't in full confidence send you a tuned ECU that I know would work properly with your setup. If you have a wideband gauge we can maybe work something out if you're interested.
 

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I have sent US spec ECUs to Australia and the UK and they have confirmed to function just fine, but I have not tried to reflash one here before. If you'd like to purchase a core and try it in your bike we can definitely work something out.



Yes the fuel curve of the 186 is much different than a stock bore flash. I actually don't have a "standard" map that I send everyone unless they have a basic intake/exhaust. I have different files built for different cams, etc. For example, the fuel curve for a Hindle pipe is much different than it is for a Yoshi/2bros/Akra since it's so big and doesn't make any sort of torque in the lower rpm range.

I couldn't in full confidence send you a tuned ECU that I know would work properly with your setup. If you have a wideband gauge we can maybe work something out if you're interested.
ah gotcha, makes sense. I dont know exactly how the stock ecus work just figured you targeted AFR's but the stock narowband can only do so much.
 
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