Fuel injection on a Boom Vader 125

[Lucas@Air_Lift]

Hello everyone! After watching and reading MaxiPad's reviews as well as others on the Boom Vader, I pulled the trigger and bought my own. I always wanted a Grom but could never justify the price tag. The main difference between these two bikes it the the Grom is fuel injected while our vaders are not. I am going to change this! I found a full efi setup on Aliexpress for about $250 that included everything needed to get this bike injected. The kit (I ordered kit #4 http://s.aliexpress.com/FnA73Y7z) is based on a modified version of the fantastic Microsquirt ecu. I run megasquirt products on all my race cars (currently running ms3x on my 1JZ swapped IS300 drift car) and I figured my bike could use it too. Now, this is not a genuine B&G ecu, so you cannot use the full version of tuner studio or the current msextra code as that would be illegal. Anyway, I am going to document my progress here to hopefully help someone else out in the future.

[JerryHawk250]

Thanks for posting and welcome to the forum. I've been looking for something like this ever since I purchased my Hawk 250. I to have used Microsquirt in the pass and HPtuners for tuning force induction. I have lots of experience in tuning . Looks like a nice kit. Please keep us updated.

[Lucas@Air_Lift]

Originally Posted by JerryHawk250

Thanks for posting and welcome to the forum. I've been looking for something like this ever since I purchased my Hawk 250. I to have used Microsquirt in the pass and HPtuners for tuning force induction. I have lots of experience in tuning . Looks like a nice kit. Please keep us updated.

Thanks for the warm welcome! I plan on keeping this updated with all my progress. If you look at the link I posted for this kit, they have throttle body and injector options from 50 to 300cc engines. If you have any basic experence with tuning, this should be a breeze. They have enabled the self tuning feature in the ECU, so once you have your baselines set, the ECU will update and tune itself as you ride I hope to have it running on this ECU by the weekend.

[JerryHawk250]

Originally Posted by Lucas@Air_Lift

Thanks for the warm welcome! I plan on keeping this updated with all my progress. If you look at the link I posted for this kit, they have throttle body and injector options from 50 to 300cc engines. If you have any basic experence with tuning, this should be a breeze. They have enabled the self tuning feature in the ECU, so once you have your baselines set, the ECU will update and tune itself as you ride I hope to have it running on this ECU by the weekend.

After looking at it the only issue I see for my application is the throttle body flange will not work on the Hawk. I'll have to look into different manifolds and see if I can make it work.

[jsumd]

Nice! I will def be following this! I also always wanted a grom but couldnt justify the price. Still waiting on my vader to be delivered.

[Lucas@Air_Lift]

I figured I would share a little more info on the kit. This "MotoEFI" kit uses may of the Ecotrons efi components. The main difference is the ecu. MotoEFI uses a ecu based off of microsquirt architecture, where as Ecotrons is its own proprietary unit. I think they can get away with selling this because they made subtle hardware and firmware changes so it cant use megasquirt software. For tuning it uses a modified version of the legacy EFITune software that was used to tune megasquirt back when it was first released. Anyway, the ecu does not have a connector, but is fully potted and waterproof. Note that connectors should be used at all wiring connections so it can be removable.


The wires are all clearly labeled, and it even has a ring terminal with a temp sensor epoxied into it for "coolant temp" which will really be cylinder head temp.


My favorite part of the kit is the throttle body. That little black box has a throttle position sensor, manifold absolute pressure sensor and intake air temp sensor all integrated in to one unit.




More to come

[Lucas@Air_Lift]

After pulling the plastics off, I realized this should (in theory) be a very simple job. The bike uses a 4 wire DC CDI box that has all of the needed efi connections broken out to a single connector! I have to verify this still, but it seems that switched 12v, ground, crank trigger and coil trigger are all on this connector. I just so happen to have a spare mating connector for a CDI box, so I am hoping I can wire this up without cutting a single wire on the factory harness.

As for the fuel pump, Boom was nice enough to put a vent hose to the charcoal canister for emissions. I am going to use this vent hose as my fuel return line. I am also deleting the EGR.. because who needs that?

I already welded in the needed O2 sensor bung in to the exhaust, and also did a little port matching a smoothing of the intake manifold I will be using. The Vader uses a very small intake manifold, and I am replacing it with a rotating flange and a 56-2 intake pipe. This fuel injection kit was originally designed with GY6 scooters in mind, so the flange of the throttle body is rotated 90* from where our bike carbs normally sit. I fabbed up a small flange on our CNC plasma table at work, but I may not need to use it. Here are a few more pics of my progress.

[Azhule]

Looks like some new EFI sellers have shown up on AliExpress... the 2 I tried to contact and the 1 I ordered from basically gave me the run around for several weeks...

Might be time to order a 200cc and 650cc kit for my 2 motos

[Lucas@Air_Lift]

Last night I confirmed that the cdi box has all of the wiring connections needed, so I went ahead and soldered on a mating connector. I also learned the the kill switch shuts power off to the coil and not the cdi, which is awesome as the ecu will stay powered as long as the ignition is on. I am still hoping to have it running by this weekend ��

[_MaXiPaD_]

This is awesome! I'm glad you hopped on here to document your progression! I'm definitely going to keep close tabs on this thread. I just don't know if I'll ever grow the balls to do it lol

[Lucas@Air_Lift]

The efi kit is noe completely installed, but it doesn't want to run yet. The ecu is not seeing a crank trigger, so I will diag that this week. I would habe done it over the weekend but I had to pickup the drift car from the shop. Anyway heres what I did..

Intake rotator installed


I removed the charcoal canister to install the high pressure fuel pump






The new cdi box installed where the stock one went


My fuel feed line. I added a shutoff valve and high flowing cleanable filter on the inlet


I attached the ecu under the gas tank with a few zip ties


Fuel return line


Intake manifold amd throttle body installed. The fuel line is very close to the starter so I will but something between them to minimize the chance of chafing.




Exhaust and oxygen sensor installed


And it looks like I can still use the stock airbox!


More to come

[Lucas@Air_Lift]

I just verified on lunch that the ECU is getting a proper crank signal, but for some reason it is not registering any RPM. I plugged in the stock CDI and gave it a spray of starting fluid and it fires right up. Still haven't figured out what is going wrong here. I am starting to suspect a faulty ECU but we will see.

[JerryHawk250]

Hope you get it figured out. I really want to see how this works out. I like to see how much more power EFI has over the Carburetor.

[Lucas@Air_Lift]

It runs! Turns out i had a bad connection on the crank trigger. Also, my return lime seems to have a blockage and isnt returning fuel to the tank. Either way, she lives! More to come soon

[JerryHawk250]

Now waiting for results.