DHM Performance ECU Flash for the 2022+ Honda Grom

DH Motoring

Sale price $159.00 Regular price $199.00

Shipping calculated at checkout.

Customer Reviews

Based on 3 reviews
Scott Kilbourn
Stage 1 reflash

Thank you for the quick turnaround first, 4 days and I was riding! My reflash is absolutely perfect! No more flat spots in the rev range anywhere. It also idles better for some reason. And I picked up 3 MPH on my top end. If you are thinking about getting the reflash, just do it! Take it from me, it is awesome!

Julie Shiflett

Now it goes 74MPH! All we need now is the MGP shift...where can i find this?

DHM Tune

DHM Did a fantastic job with my tune. Highly recommend them for all your go fast parts!

After months of development, we're now offering ECU flashes for the 2022 Honda Grom!
The 2022 Honda Grom doesn't run as lean in the lower RPM as the previous generation, but still runs lean at higher RPM once an intake and exhaust are added. Honda was also very conservative when mapping the new bike, and has left a bit of power and throttle response on the table. As seen in the dyno graphs, we've been able to pick up quite a bit of mid range power and we've also smoothened out the awkward power hiccups that the stock mapping had. 
The DHM ECU Flash modifies the following:
  • Fuel mapping - we remap the entire fuel table to help your bike run safer while also making more power than the factory mapping. We can maintain factory fuel economy at part throttle while also making sure the bike runs safely and effectively under load. Fuel mapping is essential to keeping engine temps down.
  • Ignition timing - we modify all spark angle maps to increase throttle response and power while keeping temps down. This can also help with fuel economy at part throttle, while allowing gains across the board when under load. We've altered the timing to eliminate the factory power dip around the 5,000rpm mark.
  • SOI - Injection timing is modified to make sure that fuel is delivered at the most precise moment to increase efficiency and power. 
  • EOT Tables - We alter engine operating temperature tables to make sure the ECU compensates for high engine temps. This failsafe helps prevent engine damage when extreme temperatures occur.
  • Optional - Tip sensor delete and Cold start delete.
We have maps for nearly every combination of intake, exhaust, and cam, and are currently updating our library daily. If you don't see your mods listed, feel free to inquire, we may just have a setup for you. 
We currently have maps for the following exhausts: Yoshimura, Hindle, Vance&Hines, Anodized Racing (Amazon), Over High mount, and the Zoom loop and Brute.
We have maps to work with the following intakes: Chimera, MNNTHBX, Airbox mod, and Dinger Short and Mid.
We can map for the following cams: DHM S1, CJR, DCR
Our S1 cam for the 2022 model can be found HERE.
ECU updates will be free until further notice. So if we release an update to this flash, you can send your ECU in for the free update, you'll just need to cover return shipping.
New ECUs are not yet available from Honda so we aren't able to offer preflashed ECUs at the moment. We will be offering this option as soon as they are available.
***After checkout, you will receive an email confirmation that will include shipping instructions, as well as a link to an online form that will ask for your specific mods.***



  • Red: Bone Stock
  • Orange: DHM Short Intake and stepped exhaust, stock unflashed ECU
  • Green: DHM Short Intake and stepped exhaust, DHM tuned ECU
  • Blue: DHM Short Intake, stepped exhaust, and S1 cam, DHM tuned ECU

  • Blue: Stock 
  • Green: Chimera Intake, Yoshimura Exhaust, DHM S1 Camshaft, DHM Tune