Fuel injection on a Boom Vader 125
 

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.

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.

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.
https://www.chineseatvonline.com/ass...25/4pinCDI.jpg
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? :hehe:

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.

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:tup: 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.

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.

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 :hehe:

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.
http://i3.photobucket.com/albums/y78...321_130654.jpg

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.
http://i3.photobucket.com/albums/y78...321_130648.jpg

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.
http://i3.photobucket.com/albums/y78...321_124148.jpg

http://i3.photobucket.com/albums/y78...321_124143.jpg

More to come:thanks:

Thanks for the update. This is one I will be following. What is the inside dimension on the engine side of the throttle body? I trying to figure out what I'll need for the intake manifold. It would be great if it wasn't a flanged throttle body. It would be so much easy to make it work.

28mm is the internal diameter. If you contact him, you can actually get a flanged or a hose connection throttle body :tup:

Edit: check this out.
http://s.aliexpress.com/J7z6FbUr

Thanks, I know what my next mods going to be.:yay:

I have no prevision for fuel return on my tank. I don't see why I couldn't "T" back into the fuel line between the petcock and tank? :shrug: Otherwise I would have to drill and solder in a connection towards the top front of my tank. Just thinking out loud. I'm trying to build this in my head before I order anything.

I had planned on doing the same thing until I found the evap line. No reason that wouldn't work.

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 ��
http://i3.photobucket.com/albums/y78...321_165331.jpg

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