Speed hacking Bosch (or Yamaha) drive - efficient? detectable?

Aleks

New Member
I am looking for electric bike and really have preference for 28mph version. I also prefer mid-drive system. This leaves very few options - and even few that are available are pretty expensive - so I am strongly considering getting 20mph one and if that's not sufficient - using dongle or move magnet to crank arm methods to raise speed limit. I spoke to few dealers about effectiveness and implications and got mixed messages.

First question - would tricking speed sensor on computer result in similar performance as unmodified version? Assuming up to 20mph of course. Or would modified version be substantially sub-optimal because the "speed+torque to assistance" mapping would be off?

Second question - in case service is needed - and modification is removed - is the fact that speed sensor was modified detectable by dealer (assuming there are no cable cuts, etc). I was told that by reading computer data it is possible to tell. I have hard time understanding how that is possible - since computer does not really know how fast bike is going - just what sensor is telling it. Is answer different for Bosch vs Yahama (e.g. does Yamaha have a computer port to read from)?

Thank you
 

TimmCVR

New Member
Hey Aleks,

visit:
www.chefvomradweg.de

We launched some Videos how to use/install the TuningKey (for BoschDriveUnit),

We, the Dealers, cannot see with the BoschDiag SW, when you hack the Speed...
Bosch said they can, but, who cares...

timm
 

jasond1979

New Member
I put the dongle on my Bosch system and couldn't be happier. I don't notice a difference in the speed/torque ratio as far as I can tell its the same. Your just not artificially limited by the 20MPH limit. Today going to work I was able to keep up with a 5K+ carbon fibre bike and a rider that was at least thirty years younger than me. We were both going about 28MPH for about a mile, that's about the limit I've found on the Bosch system.
 

Aleks

New Member
I put the dongle on my Bosch system and couldn't be happier. I don't notice a difference in the speed/torque ratio as far as I can tell its the same. Your just not artificially limited by the 20MPH limit. Today going to work I was able to keep up with a 5K+ carbon fibre bike and a rider that was at least thirty years younger than me. We were both going about 28MPH for about a mile, that's about the limit I've found on the Bosch system.
Which dongle did you use?