Bosch Mid-Drive 250-350W make faster?

[Allex]

Is it possible to modify the speed(25km/h limit) and power on those systems? Anyone tried, I guess it will need another controller but then you would not have the torque sensor capabilities?

 

[sigimem]

I read about a "dongle" that can unlock the speed limit. There are german sites selling it.

 

[mfj197]

Indeed there are a number of solutions, virtually all operating by intercepting the speed sensor signal before it gets to the motor. The badassebikes dongle https://www.badassebikes.com/en/ is one of the most common - battery powered and clips over the original speed sensor so easily removable too. http://www.sx2dongle.com/ make dongles that plug in to a custom loom, so you need to open up the motor to fit this custom loom. SpeedUp Ghost is similar - http://www.speedup.altervista.org/ - although it plugs in and remains installed inside the engine cover. Finally the Bikespeed Key http://www.bikespeed.de/key_en.html takes the form of a USB dongle (so easily removable) but still requires a custom loom to be mounted inside the engine cover.

Of course the one problem with all of these is the displayed speed is also affected. The dongles usually work by dividing the speed pulses by 2 or 3, so the speed indicated on the Intuvia head unit reads half or a third of the proper bike speed (once above a certain cutoff). There are a couple of systems that claim to get round this problem and indicate the proper speed on the head display - ASA eSpeed (http://www.tuningbox.net/epages/Aut.../AutotechnikSaretze_K_43902637/Products/5-003) and another one by Bikespeed, the Bikespeed RS (http://www.bikespeed.de/RS_en.html). Both of these need to be mounted inside the engine cover.

Bosch have also made it clear that their warranty is unlikely to be honoured if the customer has fitted a dongle.

Michael

 

[Allex]

Looks promising then.
"This Chiptuning Box can be installed on your Bosch eBike within seconds. It will increase the max speed of your eBike, enabling you to reach velocities above 30mph" Pretty pricey tho.

What about pwer increase? I doubt that the bike would go 30mph with 250W middrive from Bosch. Could you slam another controller to it or modify existing? I would at least like to have 1kW.

 

[mfj197]

What about pwer increase? I doubt that the bike would go 30mph with 250W middrive from Bosch. Could you slam another controller to it or modify existing? I would at least like to have 1kW.

No, no power increase possible to my knowledge. It's already nearer 500W than 250W apparently. There's not much call for 1kW or above in Europe where Bosch are from - it's all about 250W (the legal limit). Also bikes with the Bosch system are not exactly cheap so people would be rather reticent to take the motor apart. The system is proprietary and apparently has no user serviceable parts inside. It is very nice to cycle though - far more natural and bicycle-like than e-bikes with speed sensors or throttles. I'm hoping that Bafang will produce a torque-sensor version of the BBS01 with motor current proportional to input torque.

Michael

 

[Allex]

250w is crap and they will soon realise it and go for similar USA have, 750W
Yes I hope they release BBS03 soon with torque sensor instead of speed sensor.

 

[littleskull99]

My friend has these dongles on his haibikes and you can get up to around 40mph peddaling hard but then you run out of gears. They do work as advertised though.

Matt

 

[amigafan2003]

250w is crap and they will soon realise it and go for similar USA have, 750W
Yes I hope they release BBS03 soon with torque sensor instead of speed sensor.

I've measured a peak of 800w on my Bosch equipped bike. 250w is just the legal "nominal" rating and it's pretty meaningless.