Bosch gen 2 and gen 3 hacked: double the torque

[Batteryrepair]

I'm still working on this, but with some CANbus spoofing and torque sensor modding, we're able to increase the torque of gen 2 and gen 3 Bosch mid drives.

As you can see, the max current increases from 14A to 28A. Max speed remains of course. So the bike is still legal.
Normally the battery stops working at around 24A, but we've been able to circumvent that, but only with appropriate cells of course.
Measures needed to be taken to reduce voltage drop over the cables, as this can trigger an error code.
The motor itself seems happy to take it, still not hot to the touch after 35min of driving with the brakes shut, average current of 24A.
We are also able to make the torque sensor more sensitive, for older people or disabled riders.
www.driveunitfix.com

 

[stancecoke]

As you can see, the max current increases from 14A to 28A.

You should post this on the german pedelecforum, it is full of Bosch Fan Boys, as the Bosch middrive is a german phenomenia mainly

https://www.pedelecforum.de/forum/index.php?forums/bosch.30/

 

[Batteryrepair]

You should post this on the german pedelecforum, it is full of Bosch Fan Boys, as the Bosch middrive is a german phenomenia mainly

https://www.pedelecforum.de/forum/index.php?forums/bosch.30/

For some reason many Bosch repair shops like that Bosch isn't repairable of moddable... For most, Bosch is holy. Until their battery has water damage from light rain.

 

[neptronix]

I don't have a Bosch but thanks for sharing for the benefit of others

 

[qwerkus]

For some reason many Bosch repair shops like that Bosch isn't repairable of moddable... For most, Bosch is holy. Until their battery has water damage from light rain.

It's not so much that it technically not repairable, but more like: if you touch it, all warranty is voided, and if you have an accident and someone can prove you touched the motor, you're 100% liable + fined - even if you did not mess around with top speed. I live in Europe, and it's really a stupid situation. Bike shops around here can only do 2 things: check/update the firmware or replace the entire thing. And that's supposed to be sustainable. I really hope bosch and co will go the way of the german car industry, they only exist because of ultra protectionist laws.

 

[Batteryrepair]

This Bosch motor first pulled about 10A at 40V, so 400W peak. Quite far from the claimed 586W.
After the mod, it pulled 15A, so 600W peak at 60Nm.
Well we are working on a reliable way thats not detectable by the Bosch system, to boost the torque. The internals of the gen 3 motors are generally the same. The performance line has a steel gear but then the motor rotor tends to fracture. So we keep the replacable nylon gear.
We're still looking for a one way needle bearing that can take way more torque.

 

[Batteryrepair]

A nice side effect of this mod is that the Bosch battery now takes up to 8A quick charge, without even needing the proprietary Canbus 6A charger. Anything past 4.5A requires canbus normally.

 

[oneiro]

A nice side effect of this mod is that the Bosch battery now takes up to 8A quick charge, without even needing the proprietary Canbus 6A charger. Anything past 4.5A requires canbus normally.

How is it going after a couple of months, is it avoiding Bosch lockdown errors?

 

[Batteryrepair]

How is it going after a couple of months, is it avoiding Bosch lockdown errors?

Oh yep, so far every bike from 2014 until 2024 works with the mods, no errors after updates

 

[antonio6019]

interesting, it would be possible to have some more information on how to act, it would also be enough to be able to stay within the limit imposed by the battery

 

[DPC18RI]

Looks like on TikTok that person has a programmed device to check the torque sensor in Bosch motor. Interesting, i forgot about that back in the days.
For non smart systems, Taking an existing device, used for open the output of a battery and disable in the code the "keep alive" ID's and replace some of the displayed data (ID's) with the one for the torque sensor. should it work? I can not test it myself anymore because i sold my Bosch.