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What’s up guys! New to the forum and honestly new to the grom world. I’ve always wanted one but never pulled the trigger. Until a few weeks ago.

I was and still am a huge supporter of Alta Motors. A company that unfortunately folded last year who made race ready electric dirt bikes. So....

I managed to get my hands on an complete Alta Drivetrain as they where shutting down. My wheels where spinning for a few months on what to do with it. Then it hit me... Grom Time! It’s just too perfect of a combo!

So the goal of this project is to be the fastest Grom imaginable on an unmodified chassis. I will be documenting the entire thing from idea to race results on my social media.

Some details:
-2019 Unmodified Grom Chassis
-Alta Redshift Drivetrain
-Batteries: 350v li-ion
-Capacity: 5.8kwh
-Range: 50+ Mile combined (estimate)
-Horse Power: 50hp (stock)
-Torque: 42 ft/lbs (stock)
-Weight: 250lbs (estimate)
-Top speed:120mph (estimate)

Latest video: https://youtu.be/aHfxI57jozM
Instagram: https://Instagram.com/electrobraap
 

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Sounds cool man. Interested to see the practical range of that battery. There's only 9 mins of battery at rated output.


The unmodified chassis makes me nervous though.


I seriously considered building an electric but was turned off by the price of the batteries.

I presume the alta system is AC with regen?
 

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Welcome to the forum, can't wait to see how you approach this build. Good luck
 

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When photogromer and Wally came to San Francisco to pick up two new stock Honda Groms for their ride across the USA to Florida there was a guy that met up in San Francisco who worked for Zero Motorcycle who had a electric grom using Zero electric motor. The rear sprocket was hugh, I'm not sure how many teeth was on the rear sprocket.
 

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When photogromer and Wally came to San Francisco to pick up two new stock Honda Groms for their ride across the USA to Florida there was a guy that met up in San Francisco who worked for Zero Motorcycle who had a electric grom using Zero electric motor. The rear sprocket was hugh, I'm not sure how many teeth was on the rear sprocket.
Found an article on it...

Grom Reaper: What Zero designers get up to after hours | Bike EXIF

gromzero.jpg

"The Grom Reaper has more than double the power of a stock Grom, with 27 hp rather than a humble ten. Torque goes up by a staggering +800%, from 8 to a heady 66 ft lbs. (That’s almost as much as a Harley-Davidson Sportster 1200.)"

"It shouldn’t work, but Cole is a designer for Zero Motorcycles, so he had a head start on the engineering front. And the resulting ‘Grom Reaper’ screams out to be turned into a kit for other owners of the Honda MSX125."

"A Honda Grom with a lithium ion power pack and more torque than a Yamaha MT-09."



 

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Discussion Starter #9
Sounds cool man. Interested to see the practical range of that battery. There's only 9 mins of battery at rated output.


The unmodified chassis makes me nervous though.


I seriously considered building an electric but was turned off by the price of the batteries.

I presume the alta system is AC with regen
Based on experience with my other Alta (my complete dirt bike) this thing should get around 50 miles or more of regular riding. People have been known to kill the battery on these in 20 mins If they are savages though. I just don’t see that kind of load being possible on the Grom.

It does have regen but as expected it only helps a tiny bit.
 

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Thanks for the hospitality everyone. I’ve taken out life insurance since I started the project. 😇🤞

As for the zero build, it’s aways been awesome... And I want to beat it. 😂
 

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You're probably not doing 120mph on the dirt bike.

The dirt bike will have much shorter gearing on it than a practical street bike.


I'm not nay saying at all and I look forward to seeing this thing. This kind of project is right in my wheelhouse, I'm a VFD tech with an automation company, I eat sleep and breathe AC drives.

But it is a brushless DC (AC) motor yeah?
 

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You're probably not doing 120mph on the dirt bike.

The dirt bike will have much shorter gearing on it than a practical street bike.


I'm not nay saying at all and I look forward to seeing this thing. This kind of project is right in my wheelhouse, I'm a VFD tech with an automation company, I eat sleep and breathe AC drives.

But it is a brushless DC (AC) motor yeah?
Absolutely. I imagine most of the time riding this thing will be between 25-45 mph. I don’t think I’m looking to race circuit style on it. Just horse around and break some straight line records if possible.

Correct. this motor is made my fakuta. I believe special for Alta.
 

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awesome. i look forward to this.


i'm really tempted to do an electric build as well, but probably not in a grom sized bike. i think i'd also use equipment i'm more familiar with.


but yeah if you're babying it your range might be decent? 8 horsepower for an hour might get you a decent distance.



but please do consider the frame. the stock grom frame is pretty sad. it gets wallowy with the standard horsepower the grom produces. i couldn't imagine it with 50.
 

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updates? pretty pumped on this
 

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I despise electric. We are rushing into it way too quickly.
I think its more like, we should have rushed into it 100 years ago. There was a man who had an electric milk truck in... 1910? Can't remember the exact year. His battery was good for 14 miles, and his daily route for work was only 12 miles. Charged it up at night, worked all day delivering milk to people. Now just think what could have been, with 100 years worth of development into that instead of the turd that is the IC engine. 75% energy dissipated as heat?? ... pfft gtfo of here with that trash! lol just my 0.02.
 

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I think its more like, we should have rushed into it 100 years ago. There was a man who had an electric milk truck in... 1910? Can't remember the exact year. His battery was good for 14 miles, and his daily route for work was only 12 miles. Charged it up at night, worked all day delivering milk to people. Now just think what could have been, with 100 years worth of development into that instead of the turd that is the IC engine. 75% energy dissipated as heat?? ... pfft gtfo of here with that trash! lol just my 0.02.
I looked this up and here's what I found.

"These trucks had a 3.5 HP electric motor that was powered by many batteries to produce 66 to 80 volts and a maximum of 40 amps. The driving range of these trucks was about 50 miles and the maximum speed was 10 to 12 MPH."

That's not a truck. That's a scooter that happens to haul things.

Battery technology has developed slowly. I don't know that it could have been rushed too much faster. I say that because batteries have seen widespread use for decades. Forklifts, vehicles, equipment, toys, etc. Are you telling me these industries didn't care about developing batteries and making their products more attractive? I don't buy that at all.

Sure, electric motors and batteries are efficient and clean. But manufacturing and charging batteries is very destructive to the environment. Then there's the fact that modern power plants are extremely inefficient. If you think ICE's are inefficient checkout the efficiencies of power plants. You'll probably laugh because it's quite pathetic. ICE's are quite efficient in comparison. Those are the dirty little secrets that electric fans and the electric industry love to omit.

Yes, batteries are cleaner running than ICE's, but current electric power is by no means clean or efficient. It's just cleanER.
 

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the thing with electric is that they have a one-time cost. as recycling and manufacturing improves the costs will decrease.

when it comes to charging, as power generation cleans up so do the cars


ICE cars will pollute the atmosphere from the day they start being built to the day they finish their life cycle. individual cars don't get cleaner as time and tech improves, they usually get worse as lack of maintenance reduces their efficiency.



battery tech recently has exploded. look at the capacity of your cell phone battery and the size of it. saying it sucks and writing off its viability is pretty closed minded.


i can't wait to be all electric, not only for the insane performance but also the lack of maintenance but also never having to fuel up again.



power generation is the focus of pretty well the whole world at the moment. the thirst for energy is ever increasing so you'd be foolish to think it's not a key concern.
 

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the thing with electric is that they have a one-time cost. as recycling and manufacturing improves the costs will decrease.

when it comes to charging, as power generation cleans up so do the cars


ICE cars will pollute the atmosphere from the day they start being built to the day they finish their life cycle. individual cars don't get cleaner as time and tech improves, they usually get worse as lack of maintenance reduces their efficiency.



battery tech recently has exploded. look at the capacity of your cell phone battery and the size of it. saying it sucks and writing off its viability is pretty closed minded.


i can't wait to be all electric, not only for the insane performance but also the lack of maintenance but also never having to fuel up again.



power generation is the focus of pretty well the whole world at the moment. the thirst for energy is ever increasing so you'd be foolish to think it's not a key concern.
Power plants, like individual cars, wear over time and thus they also become less efficient. They pollute more for less output as they age. That's not only true for ICE vehicles.

You bring up a great point about cellphone batteries. Most of them don't even last two days with moderate to heavy usage and some won't even make it through a day. Their claimed run time is nowhere near reality. And that's only a phone, but the same goes for cars. Tesla may claim you'll get 300 miles per charge, but in reality you aren't even going to get close to that. Battery technology has come a long way, but it still has a long, long way to go. I believe battery technology will ramp up even faster since so many companies are focusing on them, but we still got a long road ahead of us before every vehicle, even every passenger car, is electric powered. In our life time we, thankfully, will not see a time when every vehicle on the road is electric.

Internal combustion engines and the experience they provide are worth the maintenance. Electric, as powerful as it may be, isn't as fun to me. The sounds, the smells and the feel are just gone.

I agree with you there. Power is an issue in cities when heat waves come around. If you think we have the infrastructure to support all of our creature comforts as well as all of our vehicles you are crazy.

And at the end of the day the thing that nobody likes to talk about is that electric still leaves us in the hands of fossil fuels. Each day these natural resources become less and the pollution grows. That's not even mentioning the fact that raw materials for batteries are also limited resources and mining them absolutely destroys the earth as much as extracting fossil fuels.
 
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