My Honest BAC4000 Review (for Sur Ron)

I've had the BAC4000 controller upgrade for the Sur Ron for about 5 months now, these are my thoughts and experience.

Sur Ron upgrades and mods:
Power upgrade: BAC4000 + Egg Rider + BMS bypass kit

It costs about $1000 and you can get it from a multiple places. Green Line Engineering and EMoto Bros are two of the more popular options to buy a BAC4000. I got mine from emoto bros, and in this video I'll explain my experience with this sur ron controller upgrade and whether i'd do it again or not.

[Buffetology]

GLE also has four braking modes and it’s plug and play and you can tune a substantial amount of things including after market motors.

[Tonybob_Skinnyjeans]

I had the same issue with my throttle. So the reason it kept applying power to the bike after letting off on the throttle is because of the throttle threshold response.nThere should be a way for you to tune it and increase the gap in the app. It essentially just thinks that the throttle is applied when you aren’t touching it. If you increase the gap, it should stop but don’t increase it too much or your throttle response will be wacky

[Tonybob_Skinnyjeans]

I had the same issue with my throttle. So the reason it kept applying power to the bike after letting off on the throttle is because of the throttle threshold response. There should be a way for you to tune it and increase the gap in the app. It essentially just thinks that the throttle is applied when you aren’t touching it. If you increase the gap, it should stop but don’t increase it too much or your throttle response will be wacky

[sunnydays]

Would you rather go with EMB or Interesting free Eggrider vs Regenerative brake plug-n-play. I feel like the regen brake lever could save a lot of money on brake pads

[mikeinfpstwitch.tvaliber]

Nice, great vid tons of info here. Really helps with people "on the fence" when it comes to performance upgrades. Have alot of upgrades on my ride except performance 🤣 but at least i feel i could "talk" my way out of having problems with the po po (have the petal kit) not fully functional but ha ha /yeh, after changing controller etc and other mods, prob not so much. Anyway great stuff, great video editing also btw. -Cheers

[seanssends]

Sick video. Debating whether I will make the investment or not. Thanks for pointing out the pros and cons as opposed to just one or the other.

[yafois]

sounds like the Ctl is supplying trickle voltage. Perhaps looks at the wiring and install a zener diode on a wire to then readout to block parasitic voltages the shouldn't be there., Or maybe the throttle is not going back to zero positions should inducing slight throttle request?
Need to examine these things.

[bubblybrody]

Thanks for the information on the suRrOn, i’m glad you kept identifying the sUrRoN so I was never confused that you were clearly talking about the SuRrOn. Just say the name fucking normal please

[MotoRiff]

I stopped spending crazy money on the ebike and bought a motorcycle but it was fun to have

[exploringbc]

After some time, would you still recommend this controller? I have the 2023 surron c w the 38 ah battery. Planning on getting the controller soon and keeping stock battery for now.

[jasonhartless]

Can you help me with configuring the settings on my eggrider v2 to gle bac4000 on 60v battery not bypassed? I can't get help anywhere, I've tried contacting every person you can think of.

[patrickmckowen]

Good vid 👍
So you had to bypassed the batteries BMS which was limiting the current draw? Are you not worried to over draw current and over heat the batteries, potential fire?
Cheers

[dexgray]

Great video as always! I meant to ask you, have you had any interactions with police officers positive or negative? I’m planning on getting the electric power pedal kit, and not cutting the wire to keep it at 28 Miles per hour, however it seems the SurRon has gotten a lot of negative attention because of the many kids in my area ripping wheelies down busy streets going 45+ miles per hour :-/
I’m in orange county.

[EDM-Jigger]

Everyone who purchased ABCA 4000 or an 8000 for their seron or any E bike. literally has wasted their money. Those controllers are not made. for E bikes. They're literally made for farming. equipment and that's why you have laggy input. and not as customability. as an actual ebyte production controller like Torp TM500 or the TM1000 and kind of sucks to see everyone recommending that controller and people that really haven't researched. the ins and out of E bikes to the. extent that they can actually make their own informed decision knowing the specifications of that control

[ethanweckwert]

Hey man! was curious, are you running 19" wheels and shinko 244? Got 12" mini motos but really wanting to put bigger wheels back on as its super limiting on the off roading you can do

[JayOh]

sounds like your throttle was not returning to 0? the grip can get frictiony on the end of the bars if its too far on

[therealbojak]

Sounds like your throttle wasn't calibrated or it was incorrectly calibrated. You are kind of at the mercy of the dealer to "tune" your bike. I would like to tune/edit my controller myself... I bought the KO motor controller for this reason.

[gregorypatzelt]

Can the bac4000 be used for the stock battery bypassed and also a 72v when you have a chance to upgrade? On the website it asks if youll be using a 72v or a bypassed stock battery. Can the same bac4000 do both? Im new to this so any info is helpful. Thanks!

Also, from what i understand, buying it from emoto bros comes tuned whereas green line engineering versoon does not? As in the emoto bros version has an app and software to tune it. Is this true?

[JohnDrach]

In a nutshell, why do you want this thing? What are the differences and gains from the stock controller?

[markedwardhosinski]

What is the new top speed when you had the bac4000 and the stock bypassed battery I’m thinking of buying one but I can’t find a vid where it says it