How to 'Shunt MOD' your Bosch Gen4 for 70+ km/h and 729+ Watts

Mod the Bosch gen4 eBike motor shunt circuit to increase the maximum power : First you need a way to derestrict your eBike ( my SpeedX2 , SpeedBox ... etc ) .... Second you need to mod the pcb ....
With good wiring 800+ Watts is possible .

[rirrid]

Thanks for posting the only diy mod for the bosch gen 4 in existence. Just wondering how it is holding up for you and has it proven reliable?

[Johnny_Stargate]

Hello, great mod I love ❤️ it. Any news about custom battery build for this engine there is advance BSM that is difficult to replace?

[smubro]

this is exactly what i was looking for, gerat job!

what do you think is the amp limit the gen4 can handle continuously without getting too hot or frying the bord?
thinking of building my own battery with better cells - lower V drop and capable of higher Amps.

also im currently trying to spoof the torque sensor input to build a an adapter to fit a hall sensor thumb throttle.

cheers

[alexblome]

Amazing work. Thank you! Will try this within the next week an post my results.
Do you have also have a throttle-mod-solution for the Bosch CX4 Gen 2 (2020)? So using the power support at the handle bar without paddling? Would appriciate any help.

[upanddown]

hi, what are the results today? did you need any more modifications? did changing the resistor greatly affect the resource? does this system still work or did you have to modify the shunt in the battery?

[tonyhill]

Hi where are you based is it poland? It looks really nice, certainly compared to the UK !

[hellraiser]

hello! very nice work! i have speedbox3.0 and bosch gen4. cx line. i was wondering is there a way to "erase"-motor memory? (i had one 504 error, but ok now)? thank you

[harisbuza]

Does this work in all the modes or just the turbo mode? Keen to try this mod, very cleaver!

[Vedrinec]

Battery will have voltage sag, and controller is not easy to take out, so people will brake motors if you dont warn them .

[CATA]

Ai pus divizor peste rezistentele de la filtru differential de la shunt. Tin feturile/motoru la curentul crescut? Pinionul mare de la pedale e din plastic? rezista la acel cuplu?

[WimHgH]

Have u ever tried this or do u have any expierience to do this on an Bosch Gen2 CX

[MrINKOMPATIBEL]

Great work! Is there a documentation?

[vagabondus]

Salut am si eu un motor bosh gen5 si vreau sa-l pun la un proiect nou ai putea sa ma ajuti sa-i fac cablarea contra cost ?

[ebiketraffic]

salutari. Am si eu o intrebare un pic off topic. Poti adauga acceleratie la deget pe un bosch gen 2? Multumesc.

[stratosaba]

i need to mod the pcb for 20% increase. The resistor must be close to 700 ohm? Can you tell me the formula that calculates the increase, or the max Watts, or the max Amps, in relation to the resistors you add?

[Nicu-mh]

Salut!

Vreau sa imi schimb motorul un bosch performance line cx gen 4 smart ca a decedat si nu stiu daca necesita ceva configurare specifica, fiind noul smart system ma gandesc sa nu ceara configurare ca n-am la mine in oras pe nimeni cu diagnostic

[stoiansebastian]

Salut! Ce metode sunt de a scoate limitatea la un BOSCH Mittelmotor Gen.4 "Performance CX", 36 V, 250 W? Am nevoie de limitatea scoasa pt off road . Mersi!

[silviu.filipescu]

Intre banci si Galacta mai sta radarul, vezi sa nu te ia!
Nu stiu la ce-ti foloseste acest tuning e MTB nu cursiera. Eu am prins cu Cubeul meu electric 60km/h la vale si fara speedbox.

[stratosaba]

Please tell me how many Wh battery did you use?

[Loveiceolator]

hello, I have just soldered the resistors again on an R&M charger 3 rohloff HS, 1125wh unlocked by Ribell chip. it works until the moment of error 606. when I use the engine at full load in turbo and sport mode... Should I review my battery wiring, my lighting, the Rohloff?
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