This batch is for our APRIL shipment (arriving April 21st)!
Buying power upgrades from us comes with a phone consultation so we can custom tune your BAC4000.
Our BAC4000 controllers come with the superior APT display, which gives you the choice of 5 or 9 power settings of usable power. EBMX worked with some of the best professional ASI tuners (and EV Racers) in the world perfecting these tunes, they are 2nd to none. Fun fact, we have local wheel and battery customers with tunes from other vendors (all with EggRider displays). Where other tunes are cheaper, they feel cheaper as well. Error codes when rolling backwards, no automatic motor heat protection, no battery voltage cutoff protection, and they ride more like an on/off switch. When swapping bikes, we often get asked to install the EBMX tune over their existing tune. Simply put, the EBMX tune is as good as you've read about.
This is the full kit and includes everything you need.
- ASI BAC4000 Controller (tuned for 8.5kw power) with mounting brackets
- Plug-and-play Harness with custom made cable extensions to better fit the controller on the frame.
- APT display screen and thumb controller for up to 9 power adjustments
- BMS bypass cables
Charged Cycle Works opinion on BAC4000 vs BAC8000 vs 72v vs 60v 53ah
We ride our bikes pretty hard (exclusively off-road), and we value controllable power OVER maximum power. Max power with battery upgrades on these 115lb bikes is nearly uncontrollable in most riding situations, and potentially dangerous for inexperienced riders. To keep the front wheel down, controllable smooth power delivery is key. We typically only recommend our BAC8000/72v combo to bigger customers (200lb+), motocross tracks/racing hare scrambles, or where riding at full speeds for long periods of time (like on the road). Our sweet spot is the BAC4000 + EBMX 60v 53ah battery. This is an ideal setup which almost doubles the range of a stock SurRon and has more power than you'll need (you'll likely only use 50-60% of the power output from this setup in most conditions). Almost all customers (ourselves included) run our tunes at 2,3,4 (out of 5) the majority of the time, rarely using the full power settings.
If you've seen our YouTube or IG videos, Nate (6ft tall and 160lbs) runs a 16/19" wheel setup with BAC4000 (tuned to 8.5kw) and EBMX 60v 53ah battery. Brian (6ft tall and 195lbs) runs our bigger 18/21" setup with BAC4000 (tuned to 12kw) and EBMX 72v battery. We can ride almost the same speeds and achieve similar range when riding together.
BE SURE TO WATCH THE INSTALL VIDEO BELOW BEFORE PURCHASE IF YOU PLAN TO DIY INSTALL. SPECIALIZED TOOLS AND GLUE ARE REQUIRED TO PERFORM A BATTERY BYPASS.
BMS bypass lead and detailed instructions are provided by EBMX and SurRon Mod Shop to perform a BMS Bypass on your stock SurRon 60V battery here.
WARNING: The battery bypass procedure is very dangerous, a mistake could cause a Lithium Ion fire (like all those Tesla Videos you have seen) or worse electrocution! This procedure should only be performed by a license electrician and Charged Cycle Works is not responsible for any damage or injuries or death caused by this procedure.
Tools Needed to Install:
- Non-Corrosive Silicon
- HD wire crimper
- Extra heat shrink 1 inch
- (Watch the video for all of the tools needed for the install)
- Add this labor fee to your cart if you would like CCW to install this for you.
Frequently Asked Questions
SurRon Mod Shop vs other Surron ASI BAC4000 and BAC8000 Tuners
|NO phase current errors hitting throttle too hard||✅||❌|
|NO phase current errors after jumps||✅||❌|
|NO rollback throttle issues||✅||❌|
|Low Voltage Cut Off Battery Protection||✅||❌|
|Motor Temperature Protection||✅||❌|
|Regen Functional with Protection||✅||❌|
|eBrake Cut Off||✅||❌|
|Walk Mode 3kmh||✅||
What makes the EBMX tune better than others?
First, we use the APT display which is a physically larger LCD with much more information on it and easier to use. What isn't seen or obvious in this difference is how different the tune is. The tunes developed by EBMX are deep/native tunes that actually live inside the ASI controller and these were developed by a team of ASI professionals who have many years of experience racing EV's and developing ASI tunes. These are the the best tunes that can be made on the ASI controllers. In contrast EggRider tuners are building the tune files and loading them onto the EggRider which then performs an "override" of the native tune on the controller. This translates into a less responsive and less powerful tune, but these tunes are easier to create and load into the EggRider which is why they are so popular.
Will installing this kit void my warranty?
Yes, installing this kit will void the warranty on your SurRon Light Bee Battery, if it is still under a warranty period. Please understand this is a powerful upgrade that will fundamentally change the how the bike rides. It will be much faster, more responsive, and much more dynamic than ever before.
What is the difference between the Stage 1 and Stage 2 Upgrade Kits?
The key difference between the Stage 1 and Stage 2 Power Upgrades is which battery you are using or going to use in your Light Bee. The Stage 1 Upgrade is designed to work with a BMS bypassed 60v SurRon Battery, and can work with either a BAC4000 or a BAC8000. The Stage 2 Upgrade is designed to work with a 72v Battery.
What Kit should I get the BAC4000 or the BAC8000?
The BAC4000 is perfect for the 60v SurRon BMS Bypass upgrade. The BAC8000 Upgrade is specifically designed for people who plan to invest in a 72v Battery either now or down the road. This means – that you do not have to upgrade your ASI controller again. The BAC4000 is compatible with 72v, however their are some advantages such as larger heat sink and additional power that come with the BAC8000.
Will doing a bypass decrease the life of my battery?
Yes, this may decrease the life of your battery. It depends on a lot of factors exactly how much this will decrease the life of your battery, e.g. age and health of the battery before the bypass, correct maintenance and care for the battery after the bypass, etc. Lithium Ion batteries lifetime are primarily affected by heat and number of charge cycles. If you ride for long periods at full throttle with a high power tune, you will likely reduce the life of your battery because the BMS bypass allows a faster discharge rate and increase in temperature. However, your right hand has full control over how fast you discharge your battery, small sprints of power are not damaging like extended periods of high power can be.
How much power can I expect to get from this upgrade?
The Stage 1 tune is between 7.5kW and 8kW. This is a (75-90%) increase in power. With this upgrade you get significantly more torque and acceleration at the rear wheel, and your max top speed will depend on the rear sprocket size you are running (i.e. 42-64 teeth are possible)
The Stage 2 tune gives you approximately 14.5kW. This is a (175-300%) increase in power. With this upgrade you get almost twice as much torque and acceleration at the rear wheel as the stage 1 kit, and your max top speed will depend on the rear sprocket size you are running ( ie 42-64 teeth are possible)
Can I turn regen on or off in the tune?
YES! Some people like regen, some do not, we can not only turn it on/off but also set it to a specific speed you would like it used above. For example if you don't want regen below 10mph for technical terrain we can set it to only be used above 10mph.
I do not live near an SurRon Mod Shop supplier. Can I do the upgrade myself?
If at all possible please allow Charged Cycle Works located near Ogden, Utah (or other Surron Mod Shops) to do the installation for you. If you are unable to provide your bike to a SurRon Mod Shop supplier, then you may install it yourself. Please view the installation video below and ensure you have the proper tools and are confident in your skills prior to ordering. If you are not confident in installing this yourself then we highly recommend you do not. This installation REQUIRES a very large (and expensive) wire crimping tool and other tools and glue that you might not have and will be required to purchase yourself in order to perform this installation safely.
Warranty registration and Troubleshooting guide
*Neither EBMX Pty Ltd, nor Charged Cycle Works, accepts liability for any DIY Battery bypasses or installations on our range of ASI and SurRon modifications. Although we supply fitting instructions with our kits, we do not recommend that you install the equipment yourself. If you purchase the kit to install yourself, you can contact us if you have a problem and arrange for remote support at a rate of $75 USD per hour. Email us at firstname.lastname@example.org for more information.