Search found 1057 matches

by flat tire
May 21 2019 9:31pm
Forum: E-Bike Non-hub Motor Drives
Topic: Cyclone motor problems
Replies: 22
Views: 1934

Re: Cyclone motor problems

I've bought and killed a bunch of cyclones and seen some pretty sketchy stuff from the factory so a rewould one would be preferable in my eyes other things equal. I would be skeptical about someone who offers to rewind motors for minimum wage however. That's why they suck in the first place. Also, t...
by flat tire
May 21 2019 9:26pm
Forum: EV Business World
Topic: Dreams into reality
Replies: 2
Views: 34

Re: Dreams into reality

You know elon didn't actually inhale, right? Try it that way.
by flat tire
May 21 2019 9:25pm
Forum: E-Bike Technical
Topic: GMAC vs MAC and Infineon vs Phaserunner
Replies: 5
Views: 103

Re: GMAC vs MAC and Infineon vs Phaserunner

The phaserunner is a badass little controller if it meets your power needs.
by flat tire
May 21 2019 7:28pm
Forum: General Discussion
Topic: Can a 48V motor controller work with 36V?
Replies: 1
Views: 32

Re: Can a 48V motor controller work with 36V?

First of all don't run a controller off a DC DC converter use a proper voltage battery bank. Hopefully you're not doing that and those are separate devices on the same bank. Second, if the issue still exists after rectifying the above, run a proper gage cable. Easy. Third, the controller will probab...
by flat tire
May 21 2019 4:24pm
Forum: E-Bike Build Threads / Photos & Video
Topic: EM3ev vs Luna Batteries and Kits
Replies: 8
Views: 143

Re: EM3ev vs Luna Batteries and Kits

What makes you think I didn't?
by flat tire
May 21 2019 3:52pm
Forum: E-Bike Build Threads / Photos & Video
Topic: EM3ev vs Luna Batteries and Kits
Replies: 8
Views: 143

Re: EM3ev vs Luna Batteries and Kits

EM3 is probably more professional than Luna. I don't want to worry about whether the person processing my order is on acid and sends me bottom brackets when I order a motor.
by flat tire
May 21 2019 3:49pm
Forum: Battery Technology
Topic: What is the Best BMS for LG Chem batteries?
Replies: 8
Views: 262

Re: What is the Best BMS for LG Chem batteries?

I say scrap it all and get some worthwhile hardware. 15 years ago it was interesting to have any EV at all just because they were so rare. That time has long passed so why put effort into making something redundant and lame? If you see things differently and have a good use for the car then by all m...
by flat tire
May 21 2019 3:19pm
Forum: Electric Watercraft
Topic: How can I get more speed 12v 45lb thrust
Replies: 11
Views: 267

Re: How can I get more speed 12v 45lb thrust

Water is a fluid so you have a drag is the cube of your speed problem. To beat this you either need a more efficient hull, less wetted area, or a shitload more power. Making your electric kayak fast will be expensive, but also very possible. Maybe the prop isn't that efficient, but solving that issu...
by flat tire
May 21 2019 1:11pm
Forum: Stand-up E-scooters and E-skateboards
Topic: Power of a 250 w LIME Motor
Replies: 10
Views: 191

Re: Power of a 250 w LIME Motor

No, you can't make any rules of thumb like that whatsoever. It will depend on a ton of factors like how fast and efficiently the motor is running, how heavy the rider is, what the effective reduction is, how hot it is, whether there's mud on the motor...

Use your head guys.
by flat tire
May 21 2019 1:08pm
Forum: Items for Sale - Used
Topic: 2 Surron MX - Colorado
Replies: 6
Views: 1026

Re: 2 Surron MX - Colorado

The inverted forks will be stiffer the non inverted have less unsprung weight (really, have you ever disassembled a fork?) The idea that inverted have less unsprung weight is popular but usually untrue. Personally I prefer non inverted forks on bicycles because they don't need the extra stiffness up...
by flat tire
May 20 2019 10:27pm
Forum: E-Scooter and Motorcycle Photos & Videos
Topic: Nomad - Brat Enduro ASI8000 build
Replies: 11
Views: 374

Re: Nomad - Brat Enduro ASI8000 build

DIY Zero FX for pennies on the dollar, nice!
by flat tire
May 20 2019 8:58pm
Forum: E-Bike Technical
Topic: Recommend me a hub motor
Replies: 1
Views: 77

Re: Recommend me a hub motor

If you want that much power and a hub motor, and don't want to resort to extremely short runs or exotic cooling, 20+ lbs is about right. QS motor and Leafbike also make motors in that price range. 1500W nominal is what you're looking for. Their 3000W motors are like 30 lbs and will do 10+kw.
by flat tire
May 20 2019 8:54pm
Forum: E-Bike General Discussion
Topic: Is it worth it?
Replies: 8
Views: 220

Re: Is it worth it?

Higher voltage and or phase weakening will work up to 60 or 70 but to go faster than that without unusual aero you'll need over 10KW which is probably pushing thing with that hub. Also why would you post this and not mention critical information such as your battery, the controllers you have and the...
by flat tire
May 20 2019 5:25pm
Forum: Battery Technology
Topic: Calling all battery surgeons! Have you seen this?
Replies: 18
Views: 312

Re: Calling all battery surgeons! Have you seen this?

Your BMS is ruining your pack, I would consider all those cells suspect and definitely damaged at this point.
by flat tire
May 20 2019 5:24pm
Forum: E-Scooter and Motorcycle General Discussion
Topic: Affording a powerful battery
Replies: 12
Views: 177

Re: Affording a powerful battery

"Hey guys I'm on a budget so I'm going to build a battery in a way I've never done before that requires additional hardware I don't have and non-trivial setup cost. Oh and by the way, I'm going to choose a really stupid cell seemingly at random. But it costs too much! Help me afford a battery!" Get ...
by flat tire
May 19 2019 5:01pm
Forum: E-Bike General Discussion
Topic: "the one"
Replies: 12
Views: 369

Re: "the one"

That thing is such a compromise you would be better off with a unicycle / scooter / onewheel.
by flat tire
May 17 2019 4:07pm
Forum: Battery Technology
Topic: what Voltage for CycleTruck??
Replies: 11
Views: 214

Re: what Voltage for CycleTruck??

Cyclones are duck sick and require too many modifications for reliability even at standard power level. I would recommend a more reputable mid drive like BBSHD. It is nominally less powerful (depending on the setup) but very much able to fulfill your mission, just pick a gear.
by flat tire
Apr 30 2019 10:03pm
Forum: Motor Technology
Topic: High Voltage versus High Current
Replies: 13
Views: 2255

Re: High Voltage versus High Current

John in CR wrote:
Apr 30 2019 8:49pm
Struggling to find a correct statement here.
You're the one who posted an essay last time, so go ahead and correct me.
by flat tire
Apr 30 2019 10:00pm
Forum: E-Bike Non-hub Motor Drives
Topic: 1kw rc car brushless motor for e-bike.
Replies: 13
Views: 419

Re: 1kw rc car brushless motor for e-bike.

Attaching as a friction drive automatically gives you a gigantic reduction gear ratio, No, it doesn't. It's not intuitive, but using a motor to drive a tire does not change the speed/torque of the motor at all. It is exactly as if you were driving the motor on the ground surface. Well, duh, an idle...
by flat tire
Apr 30 2019 7:50pm
Forum: E-Bike General Discussion
Topic: Juicing Up Pictures
Replies: 19
Views: 876

Re: Juicing Up Pictures

I solder all my xt90s putting the untinned cable in. If you use a flux core solder the xt90s take so damn much solder to fill the cup that there will be tons of flux swimming around. So you'll easily wet everything with solder. Make sure to fill em up all the way, but don't dwell long or the termina...
by flat tire
Apr 30 2019 6:58pm
Forum: E-Bike Technical
Topic: How work ca3 for 3kw ?
Replies: 4
Views: 105

Re: How work ca3 for 3kw ?

First, your post is unclear. We need to resolve the confusion. Is the throttle smooth, but the bike too powerful? Or does the throttle function unreliably, with no power one second, and full power the next? Please clarify! A few notes: Don't use the CA to limit performance unless you can tune a PI c...
by flat tire
Apr 30 2019 4:48pm
Forum: E-Bike Non-hub Motor Drives
Topic: 1kw rc car brushless motor for e-bike.
Replies: 13
Views: 419

Re: 1kw rc car brushless motor for e-bike.

Attaching as a friction drive automatically gives you a gigantic reduction gear ratio, but as you noted without the hassle of a belt. If you're just looking to get rolling, try it. It should work ok. But be warned, you will probably love the concept of a motorized bike and are heading for a slippery...
by flat tire
Apr 30 2019 3:38pm
Forum: E-Bike Non-hub Motor Drives
Topic: 1kw rc car brushless motor for e-bike.
Replies: 13
Views: 419

Re: 1kw rc car brushless motor for e-bike.

You will need an extremely large rear sprocket, probably around the size of the rear wheel itself to gear that motor down to be usable in a bike. That motor will turn 15K RPM with only 24V. You are looking at more like 50:1 reduction to get ~35mph. Also if the bike is full suspension, you will not b...
by flat tire
Apr 29 2019 5:31pm
Forum: Items for Sale - New
Topic: Accelerated Systems ASI BAC 4000 & BAC 8000 FOC BT Controllers
Replies: 65
Views: 6879

Re: Accelerated Systems ASI BAC 4000 & BAC 8000 FOC BT Controllers

It takes a very very long time because the owner of the business is a dishonest buffoon and extremely unprofessional. Alan runs ERT like a hobby he resents not a business. Aside from the very long wait after purchase, you are at the mercy of using his shared login to ASI's app against their TOS to p...
by flat tire
Apr 28 2019 8:17pm
Forum: E-Bike General Discussion
Topic: Link to ebike basic knowledge?
Replies: 6
Views: 169

Re: Link to ebike basic knowledge?

First read up on the scientific method, skepticism, rational thinking.

Then learn the fundamentals of math, physics, and the marriage of those two with insanity, engineering.

At that point you will really be ready to start getting into ebike basics.