tuning my bike for more speed

[Kudoscycles]

Abbott....the importers of e-bikes are as confused as everybody else,why our government just didn't sign up to EN15194 I don't understand,we would have a level playing field with the rest of Europe.
This allowance to have throttles with type approval is a distraction, for most of the UK importers are small companies and these e-bikes change models so often that type approval is not practical on our small volumes.
My e-bike supplier forces me to have the same spec as mainland Europe and is not really interested in producing a full speed throttle option.
I will continue to supply bikes to EN 15194 and pretty much ignore whatever comes out of the DfT,we are supposed to be part of Europe.
I will continue to supply throttles with a set of fitting instructions as service items to pre 2016 models that historically had a throttle,if my customers choose to buy those throttles and fit them to post 2016 models,well it's a free country,there's nothing to prevent them.
KudosDave

 

[Tomtomato]

I often ride at +20 mph on my pedelec, it cuts out at around 16.75 mph (15.5 +10% tolerance) and I provide the extra Watts to take it up to that speed on the flat.

I am assuming you are providing all the watts at 20mph, and not just the extra ones, as there would be zero assistance!

 

[anotherkiwi]

From 27 kph up to 32 kph I am providing all the Watts. The ones that I had saved up between 0 and 27 kph

 

[Tomtomato]

Your bike must be different than mine, because on mine, the motor cuts off at around 15mph, so I am providing 100% of the effort above that speed.

 

[anotherkiwi]

??? That is what I just said above -> 27 kph 100% of Watts.

 

[SteveRuss]

Here's a question. Why has the US come up with a 750w (wattage I know I know) rule that allows 20mph (if that's actually correct).

Is it a historical thing or are the American regulators actually cleverer or more stupid then us?

 

[anotherkiwi]

"Bigger" riders?

 

[selrahc1992]

"Bigger" riders?

very good point - since cars power/torque isn't limited by law but related to their weight/acceleration, why isn't it the same with ebikes? why should eric pickles have to put up with the same nominal 250 watt I do when he's trying to shift four times as much mass and as a result not able to reach 15 mph (let alone climb hills)?

 

[Deleted member 4366]

Their allowed power is 750w maximum. Ours is 250w nominal continuous rated power, which is about the same.

Think about the old Heinzmann motor with a nominal continuous rating of 200w. It gets 28 amps at 36v (actually 42v max), which is 1176w maximum input power. With an efficiency of about 75%, that will be 882w of output power.

Your average 250w Bafang at 15A is 504w maximum output power and some high torque bikes, like Woosh and Ezee run at 20 amps with efficiencies of around 80%, which is 672w maximum output. There's nothing to stop you from increasing the current further.

 

[Cyclezee]

According to Grin Technologies, with a 20amp controller and 36v battery the Bafang BPM is 79.7% efficient and produces 65 Nm peak torque in comparison the figures for the eZee motor are 81.2% efficiency and peak torque is 80 Nm.

 

[SteveRuss]

"Bigger" riders?

You're funny.