I just went from a 6 turn to an 8 turn Mac

[John in CR]

Point being is that if you turn back the throttle on a low-turn/high speed motor it will have performance characteristics very similar to the high-turn/low speed motor, but will be 5%-7.5% less efficient.

About the only thing true here is that turning back the throttle on a speed wind motor will make it slower and lower power like a high turn count motor.

[flathill]

Which wind has the most copper? The other reason the sim may not match the real world is the halls are often misaligned combined with a trapezoidal controller and your harmonic copper losses may be much higher than you expect at low throttle.

a trap (almost square wave clipped sin) controller will give motor more burst power but sinu more continous power (less harmonic losses)

[stripedtuna]

Hi everyone..

I use my 8T for a fairly flat commute to work, and love it.. Most people have talked about how good these motors go when you want to accelerate fast and get high speeds (and i agree totally) , but i just wanted to also state how happy i was with its smooth operation at low speeds.

Some parts of my ride involve bike track sections that are also shared by people walking, with blind bends that have overgrown trees making the track narrow. I only like to go at very low speed (like walking speed) through some of these spots. Also when i get to the carpark at work, I also only go at very low speed through the carpark to the bike rack. The 8T mac does this really well in my opinion. Its take off (im using a 12 fet controller) for low speed is smooth and doesn't jerk between no throttle and then too much at all. In fact the throttle for me is very gradual, thus allowing me to crawl on low throttle with ease. This surprised me. it is my first e-bike so I cant compare to anything else. Are most e-bike setups good at going low speed smoothly with nice gradual throtlle increments?

Ed.

[kfong]

This is one of the advantages of a geared motor. It allows the motor to spin at a faster rate so very slow starts have some degree of linearity. One of the reasons I like the BMC for trail riding, the throttle response is very good for single track. I've used a 9C 9x7 and felt it lacking in low end torque and response was poor for trail use. I still haven't tried my 6x10 yet to compare.

[Toango]

For my first install i have an ebikekit geared reared motor on 52v with 25 amp 6 fet controller on a 20" folding bike and i like how much torque it produces. Enough to pop a wheelie and take off fast on red lights. I also have a 7 turn mac motor that i briefly tested and it does produce noticeably less torque than the smaller ebikekit motor but the speed is faster from 20mph to 27 mph.

Anybody know how many turns the ebikekit motor is? Runs well on my setup for a small little motor.

[neptronix]

This is one of the advantages of a geared motor. It allows the motor to spin at a faster rate so very slow starts have some degree of linearity. One of the reasons I like the BMC for trail riding, the throttle response is very good for single track. I've used a 9C 9x7 and felt it lacking in low end torque and response was poor for trail use. I still haven't tried my 6x10 yet to compare.

I totally agree. I have never got my geared motor to stall. The initial torque and higher rotation speed overcome that problem in a pinch.

The MAC has been holding up against some seriously post-apocalyptic pavement since i put the gray gears in. Your BMC has been putting up with some stuff too. I'm starting to wonder if the warnings about reliability of geared motors on trails still applies.

[kfong]

With the green gears, I really thnk they are quite durable for the trails. I know the white ones were not up to it but my green ones have held up fine and I do mostly trail riding. BMC now have purple ones which are supposedly even better. I jump mine whenever I get a chance, just let off on the thottle to reduce any shock on landing.

[veloman]

Okay, I just ran the 6 turn on the saggy 36v lifepo4 at 43amps peak. It launches from 5-25mph very nicely. I haven't compared that amp setting on the 8 turn yet, but I just wanted to say that the 6 turn is capable of great torque and pull. I was able to get the rear tire loose on loose dirt paths. This is 1500watts, not all that much.

My gf rode it last night to dinner with me. She was scared. Using speed setting 1 which tops at 16mph was a good fix for the touchy throttle. When I told her to WOT it up the 8% hill on the way home, she goes from 15-25mph while on the hill. I'm so glad she could experience some decent ebike power.

Another thing I realized is how much I LOVE a lightweight bike. The 6 turn on the stock black KHS bike I have with basic 36v 11ah lifepo4 weighs about 48-50lbs. It's soo much fun to blast around on, so nimble and lively. I need to get the lipo on there though. I think will order some more to make a 48v 10ah pack.

John, I am *starting* to see what real power does on a low turn motor....