BGX, My newest build

biknut

biknut

Well-Known Member
This is Bullwinkle, my new build. The donor bike for this project was a Bigniu BGX. It's one of the new generation high speed, low torque eBikes coming out in the last year or so. It wasn't too shabby in stock form, with a claimed 1500w motor, and 40 amp controller, which actually put out over 2000w. I probably could of lived with that but it had one major flaw. It's gear drive hub motor has too much noise coming from its metal gears.. Besides that, it's the best looking eBike I've owned. That makes it a prime candidate for upgrading. This is the most extensive build I've competed so far.
The first thing I did was rebuild the stock 48v battery, turning it into a 72v 20ah pack. I replaced the stock 40 amp controller with a Russian Thermo Nucular F24, adjustable up to 500 amps. I'm running 80 amp. The new motor is a no name ,but probably QS, direct drive 5000w hub motor. My goal was to keep the bike looking as stock, and turn it into a decent street bike capable of keeping up with traffic. I feel like I achieved my goal. Changing the settings is easy, but for now I'm running it at a modest 80 amp, 5000w good for about 50 mph.
Bullwinkle sighting at the bluffs..jpg
wiring side cover.jpg
It's alive 1 2 25.jpg
 
biknut said:
This is Bullwinkle, my new build. The donor bike for this project was a Bigniu BGX. It's one of the new generation high speed, low torque eBikes coming out in the last year or so. It wasn't too shabby in stock form, with a claimed 1500w motor, and 40 amp controller, which actually put out over 2000w. I probably could of lived with that but it had one major flaw. It's gear drive hub motor has too much noise coming from its metal gears.. Besides that, it's the best looking eBike I've owned. That makes it a prime candidate for upgrading. This is the most extensive build I've competed so far.
The first thing I did was rebuild the stock 48v battery, turning it into a 72v 20ah pack. I replaced the stock 40 amp controller with a Russian Thermo Nucular F24, adjustable up to 500 amps. I'm running 80 amp. The new motor is a no name ,but probably QS, direct drive 5000w hub motor. My goal was to keep the bike looking as stock, and turn it into a decent street bike capable of keeping up with traffic. I feel like I achieved my goal. Changing the settings is easy, but for now I'm running it at a modest 80 amp, 5000w good for about 50 mph.
View attachment 116933View attachment 116935View attachment 116936
Click to expand...
How much did that little baby cost you? It's got to be upwards of three grand.
 
I love the wide tires on it. You can't really do that with a gas motor because the tire rubs the chain unless you get this big ass adapter thing put on there and that's awkward as heck.

So, the battery is in the frame and the gas tank is actually storage or do they keep the battery in there? I think they would put it in the frame to help balance the bike instead of of high like that I dont know,
 
Would you be so kind as to post a couple pictures of the underside of your seat I want to put a bobber seat on my bike and I'm not quite sure how I can do that with no eat post cuz I don't want the post on there.
 
Wevil Kenevil said:
So, the battery is in the frame and the gas tank is actually storage or do they keep the battery in there? I think they would put it in the frame to help balance the bike instead of of high like that I dont know,
Click to expand...
What looks like a gas tank really is the battery. The only difference is originally it was 48v 50 amp. I rebuilt it to 72v 80 amp. It's a little top heavy, but it's not an issue when riding. Probably would be if it was more than 20 ah.
 
There's a flat 1/4" aluminum plate welded to the frame under the seat. The factory that built this bike did a good job on a lot of little things.
 

Attachments

  • under seat bgx.jpg
    under seat bgx.jpg
    88.3 KB · Views: 11
  • under seat.jpg
    under seat.jpg
    87.2 KB · Views: 11
You must log in or register to reply here.
Back
Top