Fuel injection on a Boom Vader 125

[Lucas@Air_Lift]

Shot a quick video of startup and idle. This was after about 5 minutes of tweaking the tune

[JerryHawk250]

Sweet So does the ECU come with a good base tune to start with? I wonder if there is a way to install a knock sensor so you could tune for max timing? Would that tuning program have the capability to monitor knock?

[Lucas@Air_Lift]

Originally Posted by JerryHawk250

Sweet So does the ECU come with a good base tune to start with? I wonder if there is a way to install a knock sensor so you could tune for max timing? Would that tuning program have the capability to monitor knock?

The basemap is ok. It is not ideal for a 125cc engine as I think it was originally designed for 50cc engines. I ended up using the megasquirt basemap generator online for my VE and ignition tables. As for knock, you would need a genuine ms3 to do it right. I am running a ms3x with the dual knock board in my drift car and it works great. Problem is a ms3x would be way overkill for a single cylinder engine and would add about $600 to the cost. I plan on just slowing turning up the timing until I can hear knock, then back it off like 2 degrees. The great thing about these chineese bikes is everything is dirt cheap, so if I kill a piston its only like $30 and a few hours time.

[JerryHawk250]

Originally Posted by Lucas@Air_Lift

The basemap is ok. It is not ideal for a 125cc engine as I think it was originally designed for 50cc engines. I ended up using the megasquirt basemap generator online for my VE and ignition tables. As for knock, you would need a genuine ms3 to do it right. I am running a ms3x with the dual knock board in my drift car and it works great. Problem is a ms3x would be way overkill for a single cylinder engine and would add about $600 to the cost. I plan on just slowing turning up the timing until I can hear knock, then back it off like 2 degrees. The great thing about these chineese bikes is everything is dirt cheap, so if I kill a piston its only like $30 and a few hours time.

Thanks for the info. $600 would be more than half the cost of the bike lol. With HPtuners It was so nice to be able to log a few runs and go back in adjust the timing where there was knock. So for a 230cc engine i'll need to use the megasquirt basemap generator before I even think about starting the engine. Did you take it out for a run yet?

[rys]

This is great! Will you be publishing the base map? Also, I understand you're using the original evap line as the fuel return. Is there any concern over negative pressure in the tank, or is it vented some other way?

On some other forums there have been incidents where negative pressure in the gas tank is not released (due to a crimped line or other issue) and it causes a "dent" in the gas tank from the suction.

[Lucas@Air_Lift]

Originally Posted by JerryHawk250

Thanks for the info. $600 would be more than half the cost of the bike lol. With HPtuners It was so nice to be able to log a few runs and go back in adjust the timing where there was knock. So for a 230cc engine i'll need to use the megasquirt basemap generator before I even think about starting the engine. Did you take it out for a run yet?

Haha yeah that is why I went with this $250 kit! I agree that a well tuned knock sensor makes ignition tuning much much easier, but remember that an analog cdi and a carb will have no where near the tuneablity of an EFI system. And with the engine between your legs, you will hear knock if it is happening.

Yes I would generate new VE and ignition table before attempting to start. I'm going to say that it is a bitch, because the included EFI Tune software does not let you import tables directly from the generator, so you will have to punch the values in one by one. I opened tunerstudio, transferred my table to a test tune, then opened the maps side by side and started typing.

[Lucas@Air_Lift]

So also a quick update. I revised my basemap and now the bike runs awesome! I have not taken it for a ride yet as I need to redo my return line, make a new throttle cable and put all the plastics back on. Oh yeah, and Boom still hasn't sent me my damn MCO title! I also found a huge vacuum leak at the intake manifold that needs to be fixed. I am hoping to ride it around the neighborhood this weekend.

[StarBen]

Subscribed to this thread.

Here i was thinking that this thread is several years old then i noticed the date posted.
I admit it made me sign up here just to post in your thread

Will watch your progress

[Lucas@Air_Lift]

So a quick update. I redid my fuel return line as jerryhawk suggested and it worked great! I also found that the vent tube was pinched my the fuel tank cover, so that is fixed and is now vented to atmosphere. You can see the return line in this picture. I just used a tee fitting after the shutoff valve and before the filter.


What fuel injection?!


I have the bike running ok on the current tune. But, I have noticed that these engines do not produce very much vacuum. I am working on converting to Alpha-N or throttle position based control. I did take it out for a ride around the block and it feels so much smoother.

Unrelated note. Anyone with a Vader have issues getting your MCO from Boom? Its been over a montu and they have supposedly sent it out twice, but I have not received it. It really sucks as the weather is nice and I want it legal!!

[JerryHawk250]

Glad that worked out. By the time I buy the kit you will have all the bugs worked out . lol I'll just have to pick your brain when I do get it. As far as your MCO satiation that sucks. There's no excuse for them not sending it out yet.

[Lucas@Air_Lift]

Yeah the MCO is dumb.. but usps probably lost it as our local branch is terrible. I also forgot that I had to make a custom throttle cable. The stock one was not long enough and had the wrong end for the throttle body. I used a Venhil (i think?) Cable kit I got on amazon for like $15. Super easy, you just need a soldering iron and about 20 min. The instructions it comes with make it very easy to figure out.

[prismways]

I am having issues receiving my MCO too. My seller said they have sent it out twice already and are resending it again today (from Arizona). Not sure what is going on.

Originally Posted by Lucas@Air_Lift

Yeah the MCO is dumb.. but usps probably lost it as our local branch is terrible. I also forgot that I had to make a custom throttle cable. The stock one was not long enough and had the wrong end for the throttle body. I used a Venhil (i think?) Cable kit I got on amazon for like $15. Super easy, you just need a soldering iron and about 20 min. The instructions it comes with make it very easy to figure out.

[Lucas@Air_Lift]

Originally Posted by prismways

I am having issues receiving my MCO too. My seller said they have sent it out twice already and are resending it again today (from Arizona). Not sure what is going on.

I STILL don't have a physical copy of it. They scanned in and sent me a digital copy but I doubt the DMV is going to take this. Going to try this week as it is insured now. If they don't take it I am going to fill out the proper forms and have a cop come out and inspect it to register the damn thing as a "assembled vehicle" which is a nice loophole we have here in michigan.

[Lucas@Air_Lift]

Quick video update of my progress. Now running on Alpha-N and still no MCO from Boom

[Azhule]

I like that throttle response! Can't wait to see how it does after a bit of tuning

They need to hurry up and get the MCO to you