The ASI BAC8000 is Overkill for the Sur Ron X 

Such high quality content as always, this is information the people neeeed

Very cool! Love the technical deep dive into how some of this works! Keep them coming!

The technical content and quality of what you are delivering is amazing. There are a lot of guys in the ebike and especially sur ron world that are just trying to get in on the trend and cash out on the easy money selling products that they don't understand the technicalities on. That is clearly not the case with you guys. It's awesome to have the opportunity to own such well engineered hardware. I can't wait to buy a controller from ya'll and excited to see what you guys do in the future. I'm sure the battery you're working on will be a game changer. Bright, young, intelligent and educated. You guys will go far, keep up the good work.

Exactly what I was looking for can’t wait to watch the rest of your videos👍🏻

Awsome video, as a DIY builder working on a 32k (273hub) build..I love the solid info; this was truly a breath of fresh air for youtube. With that said my build is built entirely for street speed runs. More videos like this need to flood youtube. Great work 💪

As an engineer, this was a great explanation and good refresher for me. I just got a surron last year and just started looking into getting some upgrades. Can’t wait to post some videos.

Fantastic informative video. I was looking for this exact information. Thank you!

Awesome video guys!! I'm really glad you focused on "usable power" so many people focus on a single number and making power useable is so much more important than just a single peak power rating. This is the same reason that when MX racers such as Ricky Carmichael first started racing 450cc MX bikes with 50+HP, many of the pro racers actually detuned the engine to make it more usable and win races. Meanwhile ameature racers with the mindset of more power = faster were bolting on aftermarket exhaust and other power enhancers...by increasing power they were actually getting slower lap times. If you ride a modern EFI 450cc race bike and compare it to the early 450cc machines, you find a far smoother power delivery in a modern bike which can actually feel slower to your senses, but the "usable power" dramatically increases your race speed.

You guys are great. This clear some many things i have on my head by what type battery i want to run on my x260..

Thank you so much bro the whole part on phase current helped me so much I think this is why my BBSHD with the asi bac855 keeps getting burning hot despite if I run it in my torque gear aka 1st gear the whole time it still gets burning hot. I was always told to run it this way because I was told on that motor that you want the motor spin as high rpms as possible to keep it running cool and seen some videos with guys pushing high power but on bigger rear sprockets and the motors run cooler (on the BBSHD we change the front chainring instead as opposed to surrons with the rear sprocket due to the derailer as I'm sure you know). This all makes sense to me now after your explanation and I can finally get why a 72v gives more speed despite the bac855 adjust it's amp draw down for the 72v thus producing the same max watts on a 72v battery as it will do on a 52v battery. On the 52v battery the bac855 raises the amps some than what it runs the 72v at. I'm from the drone world and so I always knew about the kv of a electric motor and how it relates to speed and which battery works best with which kV and so on. I sometimes wonder if they make a higher kV motor you can slap in the surrons and that would effectively be similar to running a 72v battery on the stock one.

THANK YOU!!!! have been researching sur ron for 2 years+. Specifically what pros/cons and RISKS of upgrading would be and the upgrade will certainly happen shortly after I buy the Sur Ron. this gave me VERY good info that I didn't find elsewhere about the Upgrade. Thanks SOOO much

It’s a great day when ya have a new video 😁

I've been in the offroad scene for many years, what you guys are learning is its better to be able to control the vehicle, suspension, before higher power outputs.

very interesting! looking forward to the time we finally will update to bac4000 / 72V Batterie

Good video and very well spoken on the subject.

I have been looking for this information thanks!

This is literally the video I needed thank you for explaining.

WOW you guys are awesome !!!!! Im looking at buying a Surron and then your kits.

amazing video thanks guys!!!

Any chance we can get an update on your website for the BAC 4000? Still says next batch expected February.

Amazing information. Thank you.

Thanks for making this!

Perfekcyjnie wytłumaczone 👍🤟🥃

Well explained video bros👍

Hi. I'm planing to upgrade controller, battery, suspension and brakes. In that case, can I buy light bee S as a base? Is S and X frame and motor the same?

Good. I can relax and keep on running my stock motor and bms bypassed battery with your kit. Cheers.

🙌🏻 thank you for this!

That was an amazing video. Very helpful, thank you! Great way to explain field weakening especially. I just bought a Sting R MX4 with a BAC8000 and I'm trying to learn everything I can about it. I'm waiting for GLE to authorize the dashboard app for me right now. Why do they do that?

You guys are freakin awesome. Definitely buying a kit from you guys when your next batch drops. When are you restocking?

Don’t own a Sur-Ron but a very knowledgeable video and well interpreted. Very well don with all the information.

Man. 😳 this is the info I been looking for

This is awesome. I was a physics student for 3 semesters and completed a B.S. in ME yet watching a video about the Surron is the first time I've ever heard of "phase amps" and "magnetic saturation"

When will we see your new tire test video? Any thoughts on the 9 lbs Duro HF308 4 Ply 3.50-19 tire. Also awaiting for you guys to start selling wheels and chain offset shims.

Watching this vid, I feel like I accidentally stumbled into a classroom at MIT on electrical engineering... and I'm like "Oh $4!T, this is way over my head", but I find a seat and sit through the whole class... Awesome vid and explanation. Thank you!

OK OK your qualified to come setup my sur run just let me know when your coming. lol Good video thx for sharing

Are the controllers only for the Surron? Or can I put it on my other 72v ???

Great video! This may save a few speed demons.

Great information and video. Curious tho, I ride 450 dirtbikes that are great on power. Do you still think the 8000 wouldn’t be enjoyable?

Great video, do you know saturation point/curve for surron motor ?

Hey nice vid do you know if I could use the bac 4000 with the 72v lite speed battery

so what would anyone recc for best range setup to have with single track off road riding? not as concerned with speed and toque as range increase

To avoid jerky throttle you can Can change throttle curve or up battery amps and lower max phase amps for more high rpm power. Gotta be careful not to overheat the motor though.

Cheers Professor!

what do you guys think of the ko nano controller?

So a question I have is what parameter does the “power levels” change when switching 1-9? Is it just lowering /raising the wattage?

Can I use the BAC8000 on the Surron Firefly Streetlegal? Or only on Surron X? And does the BAC8000 effect the Lights and Blinkers?

i didn't understand everything the first go. but it's a treat listing to you. no uhms or anything. So you sell the controller with your own tune, so you'd protect that so others don't steal it. I'd really like to have a regen foot brake and a speed limmiter. would i be able to add that myself? or is this already an option on your controller?

Can you explain phase amps and what governs that setting?

Very good video! I'll be using the Nucular 24F controller this year. I race the Sur-ron with 200cc gas bikes in Enduro races. Sticking with the stock battery tho. The 24F and a 72v 48ah would be overkill and too hard to controller in a race like this.

Good points, in the 1940's and 50s there were GP 125 bikes that could do 80% of the top speed of 1000cc bikes. Ebike power posing is normal.

Hey, I'm looking to upgrade my bike. Where can I buy the upgrades?

What about the qs205? BAC8000 OR 4000?

Is a bac 4,000 kit water proof?

looking forward to restock of BAC4000

One more reason for a clutch is the safety aspect of killing power to the rear wheel. It’s kinda crazy that they don’t have a clutch if you ask me. I’ve competed on MC’s in both TRIALS & GNCC/ENDUROS for many many years and couldn’t imagine doing this with out a clutch. What I really Like is the ones used on the ELECTRIC MOTION bikes. They have been doing it for over 5 years now with great results..Yes I’m sure it would have raised the price on the SUR-RON to a price they were not looking for. I’ve been saying that a clutch is needed for electric MC’s when I first saw these bikes coming to market. Once again a great video from y’all and one more reason for you to be the only one’s I’m distributing my parts threw!🤝👊👏👏👍

Is there a difference between 160 and 260 motors? Because I know battery and controller are different

Great video. Where you confused me is when you said that kwh is the most important number to look at when looking at how long a battery will last, and then went on to do an example where you used ah to look at how long a battery would last. My understanding is that if two batteries have equal ah, but one has a higher voltage, then the higher voltage one will go further or last longer given all else is equal. Makes sense because the kwh would be higher. But how does this play into calculating how long a battery will last? In your example, you completely left the voltage of the battery out of the equation, but instead talked about the power draw at 60v. Are you able to shed any light on my confusion? How would the voltage of the battery play into this calculation and change it?

I’m a 240lb guy that overheats the stock surron controller when I do big climbs. I can only imagine the overheating coming this summer. Already running a 58t sprocket. Would it make sense to get the bac8000 and run it at around 9-11kw allowing big overhead to prevent overheating.

There is a lot going on here, but after the second watch thru I got ya

So if I would get the 72v 45 with the asi bac 4000 would that make the bike get too hot i want to be able to do wheelies but I would also like a little distance

Informative as always guys, thank you! Hoping you might consider providing some more in depth info on batteries - proper charging procedures , break in (?), cooling times, and avoiding crystallization. The charging directions from Sur Ron are inconsistent with Retailers forum instructions. More info please ...

I'm ready to buy a 4000 and if I understand you, staying with the stock 60 volt battery and your 60v tune is the best way to go for single track and off road mountain climbing torque. How many controllers are you going to have for sale in this next batch?

I have an x160 can the 4000 be programed to a 48v? so I can upgrade battery later

im just looking for a 60mph top speed to keep up on the highway along with more range im looking at the 60v 42ah because i mostly need range rather than speed. i dont wanna spend a whole 3k plus just for an upgrade but if i was to go with a new controller i would go with e moto bros bac 4000. not only because of the display but the options to limit the power when needed. unfortunately you guys have limited supply so i might just have to get the bac 8000. if im getting a 72v battery i might as well get high AH. surronster has a 32 AH. i might go for the 40ah one last thing about all of this i need the new controllers to be water resistant is the same way the x controller is. i might just have to 3d print something to cover it i ride all terrain. mostly on the road but i want this bike setup to do everything. anyone have any opinions on this?

But...the bac8000 is not worst than the 4000 either. To me it's a in stock issue. I missed yours and with only 50 units coming this batch...I will probably miss it again. I got an bac8000 for only $200 more than a bac4000. It's on stock battery for now so hopefully tune from other company is sufficient for now. I would like to know once I get a battery upgrade will I be able to pay for a tune from you guys? Your tune should work the same regardless if it is a 8000 or 4000 right?

You can put a Hayabusa engine in a dirtbike but you wont win a enduro run with it ;)...Very nice and helpful video, boys! Keep up your awesome work.

New to Sur Ron - the battery power options are pretty overwhelming. Since so many are upping their batteries to 72V, why is it Sur Ron or someone else doesn't produce a 72V motor that is less likely to get fried by over-powering it?

👌🔥

After running your 8000 kit for a while now, I can say forsure that the stock motor can handle more than what the 4000 can deliver.

Do they give the same top speed?

Maybe your BAC 4000 controller s are programmed better . When I had one from those thieves at ERT ( Alan Hu ). It would cut out constantly with the 72v battery. I have the 8000 now and no issues. I would agree at level 9 with the Eggrider/ BAC 8000. It’s borderline uncomfortable.

Very useful in the fact that you can't have it alway there is no magic money tree be happy with what you've got

How do I get a bac4000 ?

E = Mc 2 So how much more efficient is the electric motor compared to a gasoline engine. Can they even be compared? Why is a electric motor considered more environmentally clean when the manufacturing of components is more detrimental to the environment than gas engines? How can the electric motor be more clean when it still takes fossilized fuels to power the battery, and manufacture parts. Why not just build fusion batteries or nuclear powered bikes? Are we building a 3rd world society in America? I really enjoyed your tutorial. I hope one day I will ride one of your bikes. Outstanding ! Never limit yourself or your dreams.

Still - There are new motors in the works that will be released that will fit directly into a surron, the BAC8000 wont be under powered for those - future proof the bike with an 8000! :D

Not hating but can’t the bac8k do max 840 phase amps u said 600 about unless your meaning like average 650 but max 840

Sun in your eyes mate.

ASI 8000 is serious overkill i agree, unless you wanna set ebike top speed records or something but the motor will burn out. Hell even the 4000 is overkill, peak power 72v @ 400amps? 30,000 watts? Thats like death power on a ebike. I built an electric bike long ago, 72v @ 40 amps.. thats 3000 watts.. topping out @ 40mph and that scared me. about efficiency, higher voltage is more efficient, and about 10 years ago, people on endless sphere were making ebikes that topped out @ 120v going about 60mph. But then this dude came out and smashed all top speed records in his sandals on a garage sale looking bmx bike with a welded frame attached to a hub motor. That motor had high wind (i believe) motor.. meaning for a given volt, it will do more turns. So instead of going crazy high voltage, he went small radius tire, high winding motor, medium voltage and LOTS of amps. Since then, people toned down the voltage and got fast spinning motors with lots of amps. Direct drive electrical motors love RPMs. The faster it spins, the better. So if you want more efficiency figure out how to make the motor spin faster.. more volts, or smaller wheels. Mid drive instead of hub motor.

engineer approved explication, nice work.

So,,,,, get the KO controller then?

Wow you guys are so cool and smart!!!

Guys, 😞 i have the money for bike, 72v battery n 4000, but i just don’t know! I’m so lost n stuff ain’t even in stock!😞😞😞

8:00 Google ohms law calculator

The only reason to go with the BAC8000 is that it looks better filling that gap in front of the bike. hahahaha

I've always wanted a surron e bike just cant afford it as i have kids. was going to use it to get to work. until i seen the price 6,398 Canadian. would be awsome if u guys could do little charity work and send me one lol

The bottom line is.... There are many people that have skill levels much more advanced than you. The need for higher power levels are necessary to advance the development for individuals that are in a category above your capabilities along with advancing the development of different models of the bike itself. Not all interested riders are 5'5" 150 lbs, therefore the need for power increase is logical. 🤦.

Overkill isn't always a no go. I want the most power in a sur ron..

Change the sprocket to get more top speed and you will be able to give use to that power.

i like the video but it was a gloomy grey day with glasses? i assume so we are not distracted by your eyes reading the prompt? all this was easy for me to understand as this may be the millionth time i deal with phase motors and electronics. why not shorten the video and over simplify by say volts= speed amps= power or torque watts= heat series= volts parallel= amps oh crap bed time!!! 4am

Is this the kid from modern family?

yo c ronaldo sur mon deuxieme compte

This is not true sorry. I'm 100kg and have MX forks. The bike is underpowered for me on a bac 4k and 72v. Especially on steep trails when I'm stopped midway up it doesn't have the phase amps to start again on stock sprocket

I love this young man's mind and calculating and knowledge. Just think the Woke people are saying Math is Racist!

holy 🤯information overload lol

Yeaaaaah ya lost me. Just tell me what to buy 😂

Still buying one just for he bragging rights.

So i need about 7 thousand for all this

Great video! Dump the sun glasses! Wearing sunglasses when delivering an important message is a bad fopaux.

Gay

Amazing information. Thank you.