Upgrading the stock bafang 750w rear hub on Juiced Ripcurrent S

[330rcs]

I have a Juiced bikes Ripcurrent S it has a 750w rear hub bafang motor. The bike has 26" wheels with 4" fat tires. I am wanting to upgrade the motor and I'd like to know what my options are, is 1500w possible? I know a local ebike mechanic that would be doing the work but I want to want to be sure I order the right parts, motor etc I don't want to order something thats not compatible. I was told I will need to upgrade the motor, controller and display just know idea what would be compatible with this ebike.

Thanks!

 

[linklemming]

Not sure if there is an easy off the shelf solution but it sounds like what you want is what the juiced hyperfat 1100 was...basically a ripcurrent with a MAC 12t motor. Perhaps contact Juiced to get all the parts to convert your ripcurrent to a hyperfat.

Another option is to replace motor controller and use the stock motor with more amps. Many options here including KT controllers with open source software which could utilize the torque sensor on your ripcurrent.

I mention this because my Juiced CCX with a Bafang SWX02 motor (rated at 500W at 48v) easily did 750w to 1000w at 52V in the rolling hills north of you near boulder without any issues. Who knows what the upper limit is for your setup(likely the Z910 motor plug connector).

Hopefully more people can chime in hear

 

[m@Robertson]

What is the amperage of the controller? Its a common upgrade to put a 35a controller on a Bafang 750w motor. With a 52v battery that gives you a peak of (58.8 x 35 = 2058) over 2000w.. In actuality those peaks are momentary but the "true" Bafang 750 is easily capable of taking those peaks and the continuous 1000w you'll deliver to it for a minute or so going up a hill.

I know of people who have used custom Lyen controllers on that motor to achieve 2 kw *continuous* and the motor can take it.

Also, a balls-of-steel upgrade to a 60v system, with a 35a 60v-capable KT controller and associated 60v-compatible display yields a bike capable of 40 mph. Wattage peak is (67.2 x 35 = 2352) over 2300 watts. And again that motor can take it.

Assuming Juiced didn't play the same game Rad did and put a 500w motor core into a casing labeled for a 750, you can leave the motor alone. Spend your money on other bits around it.

 

[m@Robertson]

2058W you're referring to is when the battery is 100% charged.
It's quite unrealistic because of voltage sag.
For example, if your battery's resting voltage is 50V (for example), as soon as you put power, it may go down to 47V.

Yeah sure but peak power is peak power. Its a benchmark.

Voltage sag will change from pack to pack. My little 2P pack vs. a 10P pack is going to exhibit entirely different behavior. And if you change cells from say GA's to 25R's, it'll be different for a different reason. One more reason to use a benchmark. Control your variables and from there work in how your pack/cell construction will affect your performance. Then look at your controller behavior etc. etc. etc.

 

[m@Robertson]

Interesting to run a comparison of the GMAC vs. the fat Bafang 750. On a flat grade they will both run forever. The Bafang is a bit more efficient and as a result has a longer range on the same battery. Also more initial torque than the GMAC which is also not a surprise. The GMAC has decent specs, but across the board its not a whole lot different if you go apples to apples on the variables. Where you see a real world difference is when you throw an incline at it and make it work hard. At that point you see it overheat twice as fast as the Bafang on a 5% grade. Part of that is likely the lower efficiency of the GMAC which makes it eat more amps so more heat.

None of this makes the GMAC a bad motor by any stretch. The G060 with its full-on bigfoot core is a powerhouse. @330rcs - leave the motor alone and focus on the bits around it. You've got a solid performer - assuming you take it apart and find it has the real deal inside. Given what Rad did with theirs you can't count on that so open that sucker up before you commit to it... and if you find a small core... buy the big one for $225 or so and plug it right in!

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