Single speed ebike build

[Vagos]

More updates...
I upgrated my brakes to dual pivot calipers, new brake levers and i also bought a golden handle bar to match the calipers ( i thought it would look really cool),
but it came in silver ( how hard was to send the correct color?)
I just took it for a quick ride and i saw massive improvement in breaking power!

 

[Vagos]

Just a small video of the bike and how i build it...sorry for the quality and my accent.

 

[Vagos]

Hi, my motor has these writings on it
SY73626OL0517S1. Do you know what they mean?
And the p1 setting is 87. Anyone knows if it is the correct one? That's how I bought it.

 

[Nealh]

Hub motor is from Suzhou Shengyi Motor Co.
http://www.syimotor.com/product.html
SY = Shengyi, 73626 serial no, OL may be factory code,
0517 production date & S1 maybe the quality checker ?

87 suggests about 5:1 reduction ration and 16 magnets poles = p1 or 4.3 reduction and 20 magnet poles.
P1 has a correlation with real time road speed in, so can be checked against any satnav/gps readout. Lowering the mean value adjusts speed read out lower and raising mean value raises speed reading.

 

[Vagos]

Hub motor is from Suzhou Shengyi Motor Co.
http://www.syimotor.com/product.html
SY = Shengyi, 73626 serial no, OL may be factory code,
0517 production date & S1 maybe the quality checker ?

87 suggests about 5:1 reduction ration and 16 magnets poles = p1 or 4.3 reduction and 20 magnet poles.
P1 has a correlation with real time road speed in, so can be checked against any satnav/gps readout. Lowering the mean value adjusts speed read out lower and raising mean value raises speed reading.

Thank you. So the p1 doesn't have to do with motor performance, got it. I will check the speed with my phones gps and if it is correct I don't have to change anything?

 

[Nealh]

Thank you. So the p1 doesn't have to do with motor performance, got it. I will check the speed with my phones gps and if it is correct I don't have to change anything?

If speed matches quite well then no changes needed, you can go up or down the scale to see if it affects the pas pickup/motor timing. No harm or damage will be caused by doing so and you will also see the speed read out should be not as accurate.

Hub performance may suffer if P1 value is completely out by a wide margin, my Q128c suffered pickup/timing issues with a wrong P setting whilst using PAS, throttle power was unaffected.

 

[Vagos]

Question...
Is there a way to trick the motor in order to get a higher top speed?
Micah from ebikeschool just uploaded a new video and one of the tips for higher speed, was to change the wheel settings on your display. I run on 28" wheels, if i change it to 26" will that do anything? The speed on the display will be wrong obviously, but what about the real speed?

 

[Nealh]

You might see a km/h or two more if you aren't bothered about correct speed/odo reading set the wheel size to 24 for more speed.

 

[Vagos]

You might see a km/h or two more if you aren't bothered about correct speed/odo reading set the wheel size to 24 for more speed.

So the smaller the wheel setting, the higher real speed i can get?
I will check the speed accuracy now and after the "hack" to see if it will work...thanks!
Edit. I just took a quick spin and tried a couple of settings ( 24inch, 22, 700c), but didn't notice any difference. My battery is at 37v right now,, i don't know if that is a big deal.

 

[BG bicycle]

Some LCD controllers have an absolute top speed. The LCD SW900 is 50kmh, no matter the wheel size the LCD panel limits speed to 50kmh.

 

[Vagos]

Question... Is it possible to swap the 250w geared motor with a 500w DD and that procedure will be a simple swap? Or do i have to change everything?

 

[Nealh]

A 500W DD is unlikely to gain you more speed, if you want more speed you need to up the voltage.

 

[Vagos]

That's exactly what i was hopping for , you got me. I will not bother then... Thanks.