15mph speed limit

[amigafan2003]

From reading those instructions I got in to the speed settings of the controller but it's already set to Max 40kph but tops out at 25-27kph with no assistance after that speed. . Strange. I have adjusted the wheel size but although the speedo reads faster and slower depending on size the wheel seems to spin at the same speed, haven't confirmed this with a separate speedometer but just by eye.

In that case it sounds like you're volt or watt limited or a combination of both. One option from here is to try a higher voltage battery.

You can do a cheap test by getting a 6s lipo pack and wiring it in series to your existing battery and see if road speed improves. If it does, then you know a 48v battery is the solution and will increase your top speed by around 30%.

You might be also be watt limited, which sounds likely as the no load speed increases with wheel size changes but load speed doesn't change. You could try opening up the controller and soldering a third of the shunt to increase current delivered to the motor. Although the advantage of trying a higher voltage battery in the first instanbce is that it will also increase the current delivered without having to solder the shunt.

 

[danielrlee]

Doesn't work on geared motors, only works on direct drive.

That's probably a good point..... Does the LCD continue to display a speed while freewheeling?

 

[sloth1178]

That's probably a good point..... Does the LCD continue to display a speed while freewheeling?

Yes it does

 

[Deleted member 4366]

Doesn't work on geared motors, only works on direct drive.

Woops! I think you need to think about it again.

 

[Twangman]

I have a volt metro, had it 2yrs but I have an older display than yours. Motor is the same though. I can cruise on flat rds at 31.5 kph if I have it on the highest power setting with me just light peddling. Throttle only it will do 28kph. There is a school nearby were I live which has a speed display It shows me doing 19mph.so i know the display on the bike reads about right. On mine there is a sensor behind the pedal crank. Not sure if it controls the overall speed or just evens the power output as you pedal. The bike does seem to have become faster over the last 6 months, so have been wondering if there is a fault or a sensor or controller has been damaged? On the Volts as far as I can tell there is no sensor on the back wheel. Wires from the motor are fed into a box which sits under the frame. It's like spaghetti junction in there and it's hard to tell which wire you can cut if any to derestrict. I know people say cut the white wire but there's more than one set so I would not advise that!