Suggestions for my second gen gng midrive ebike controller

[Josh120669]

there's my project ebike i installed a gng second gen mid drive kit on a mongoose detention stripped of all stickers & mongoose badge & replaced it with a decepticon badge you know megatron anyways the body's blank I plan on laying down some reflective tape a in some pattern kind of way ill put pics up later on my progress its only been a 3 days since I got this kit , I have have a big ass roll of carbon fiber & I have resin kit too but no experience but I'd like to mold something carbon fiber for my ebike here is the controller I'm getting is it compatible with my motor? i have 16 38120s for my power block battery
But yes the motor is it compatible to this controller?

Descriptions:

4 batteries transferred to 48V, 5 batteries transferred to 60V, 6 batteries transferred to 72V.

When a battery is damaged, as long as the width of not less than the minimum voltage power supply controller, to remove without damaging the battery replaced,Remove damaged cells, can still run. This increases the battery life.

Features:

Suitable for Electric for electric bike & scooter
Rated Voltage: 48~72 Volts (48V/60V72V)
(4 batteries transferred to 48V, 5 batteries transferred to 60V, 6 batteries transferred to 72V.)
Rated power: 1000 Watts
Casing material: aluminium
Maximum Current: 35 A ± 1Amps
3 phase 120° brushless motor
Operating Conditions: -20~45 C
Waterproof design
Weight:800g
Connection Table:

1.)Power cables: big red + big black ----- Electric Door Lock Cable: middle red
2.)Motor cables: big yellow + big green + big blue
3.)Hall cables: small red, small black, small yellow, small green, small blue
4.)Reverser cables: small red + small gray + small black
5.)Speed cables: gray + black + yellow
6.)E-brake cables: yellow(high level), brown (low level)
7.)Alarm cables: black+red(power supply), red(e-start)+blue(motor lock cable)+green(motor lock cable)
8.)E-ABS: two blue cables matched
9.)Speed limit cables: white cables matched





Also like to hear about other upgrades to second gen gng midrive kits

 

[d8veh]

The current is too high. I used a 30 amp controller for a short time. The extra high torque from the motor broke the drive sprocket and a replacement one is very expensive in Europe. My 30 amp controller is only 36v. If you run with higher voltage, you should not go higher than 22 amps:

 

[spinningmagnets]

I recommend you swap-in the largest chainring that will fit the frame, bearing in mind the larger chainring will extend downward also , into your ground clearance. Find the balance for you of chainring size in-between larger, but not too large,

This will allow you to use a larger motor sprocket without changing the original ratio. The larger motor-sprocket will lower the amount of load applied to each tooth, and it will also allow you to source higher-quality/stronger sprockets, since the stock GNG-Gen2 motor sprocket is made from Chinese beer cans. The best size of motor sprocket-to-chainring has yet to be determined...

If you change the phase-amps to battery amps ratio on a Lyen controller, it will soften the shock-loads of a sudden/hard throttle and allow you to use more overall power. This will remove the ability to wheelie, but will still allow full power at the higher motor speeds.

Thanks for posting this. Keep everyone updated on how this turns out.

 

[Josh120669]

Thanks guys ill keep updating, I live in arizona the summer heat is crazy here so I want to tap a hole on the top side and put a one way air valve because I want to oil cool it so ill partially fill the hub and the little valve will be on top of the hubmotor to vent as to not have a pressure cocker effect & force oil into and trough the motor shaft, I just want it go help cool the gears II believe that's good it can help keep the nylon gears from overheating & melting , Also I'd like to ask what size is the sprocket 1/8 2/6 so I know what to look for example free 1/5 16t sprocket and how you would go abaut to remove it but any will be better than the original sprocket, hey guys if I use the thumb throttle & accelerate slowly will it be ok or can I just mod the thumb throtle to not let it slide all the way to full throttle. lots of ideas but little me time as I'm a caregiver but I'm determined finish so it will enventually be done & ill put test drive specs

 

[Streamway]

I am new to the sphere and hope I am following forum posting etiquette. Just installed a gen 2 kit on a Sun Streamway for street use only. I will post pics later in case anyone would want to mod a step-thru type bike. Not an easy project due to choice of bike, bracket mods, no tension idler supplied with the new gen 2 kits, tight/loose drive chain, etc. NOTE: this gen 2 kit no longer comes with an idler! I know GNG has a 13 tooth drive sprocket as suggested by Spinningmagnets and that I would also need a larger than 38t driven, like 54t. Again, for street use only so ground clearance is not an issue. Bike tech said a 10t or 11t may take up the chain slack since GNG kits no longer allow for a chain tensioner. The tech spent lots of time on this and says GNG decision to no longer supply a chain idler is a big mistake. The bike shop here does not do a lot of ev work so does anyone know where I could find the larger driven sprocket or if a 10t or 11t drive is available locally? UPDATE: Sent message to Jon at GNG and he said chain tensioner not needed with this kit! Bad answer, one less link is way to tight, one more and chain will jump since motor is WAY too close to the bottom bracket. One other thing, motor sprocket and crank sprocket do not line up by 1/8". Using spacer behind the motor drive leaves almost no threads for the nut. Stay away from these junk GNG kits at all cost! They just want your money with the least amount of effort. Save you money and get a quality mid drive! Wish I had!

 

[d8veh]

We mlght be able to tell you where to get a sprocket "locally" if you tell us where locally is. Please fill in your profile properly with your location!

 

[Josh120669]

View attachment 3 well I've so busy I put the project aside however that changed I saw a milled aluminum sheet & I though mmm perfect for making a carbon fiber pannel to hide my e bike controller wires & a alarm 48to12v converter with a car type socket / USB , I've decided to play it safe for now so I'm waiting on my controller it's ku93 once I get it ill ride it & post results oh btw I haven't used the resin & I still got fine sanding up ahead to smooth & bring up shine on a carbon fiber pannel & I'm not done yet I say 85 I'm going to carbon fiber 1 layer on the bike frame where the pannels miss & ill bring up a full blended cf look oh btw a cd with a little quick steel or whatever makes a nice sprocket cover that fits too good so I carbon fiber a cd to make my sprocket cover ill post more detail later

 

[Josh120669]

The milled aluminum sheet is easy to cut & shape round or square here's the pannels I seamed the edges with crazy glue but before all this I prepared the carbon fiber sheet I hairsprayed it to keep it from fraying then I cut to size put 3m supper 77 then I wrapped it & secured the edges with crazy glue gel now well see how it turns out after my resin / sanding / buffing process