For those who dont have any motor problem and that would like to push a little higher the power of your 2010 and 2011 zero S and DS, this might interest you.
A few month ago i talked about a mod to bypass the power limiting feature of the MBB at low speed.
Bypassing this limiting feature does not mean 1000A+ in the agni but would mean that the motor current limit would be determined by the alltrax only and not by the MBB and the alltrax. so if the motor current is set to 400A i the Alltrax wich is the max recommanded, you would get 400A to push your zero from a dead stop instead of 50-100A like the actual MBB is doing.
After few hours of research and test i have discovered the right wires that connect to the controller, MBB and the magura throttle grip. Actually both controller and magura wires pair goes directly to the MBB.
The mod i'm talking about was done by installing a DPDT relay that simply bypass the MBB and that jump the wires directly from the magura to the controller.
Once i put 12V to the coil of the relay The normally close contact that connect the alltrax wires to the MBB output just open and the normally open contact become close and jump the in and out throttle signal of the MBB, allowing the signal to pass directly from the magura to the alltrax.
I use a double pole relay to also switch the ground and the signal wires.
Since the full throttle is obtained with a high resistance, the throttle goes high only diring the relay contact are floating for few ms wich does not damage anything.
Ok now my impresions:
I can say IT WORK YES !! but i have something else to bypass to allow it to fully work. But from now the motor start very quickly and seem to have gained power ALOT!! but i will confirm once i make a road test with the fully completed mod
The blue motor current sensor is detecting a higher current too and i have not bypassed it yet.
The way i thought and tried to do it is to just add a resistor divider to cut by 2 the motor current signal that the MBB is receiving but once i push the throttle a little too fast, i still get the error light indicating that the motor current sensor is having problem... so i see that the resistor divider is not working.. On that current sensor, there is 4 wires. one GND, one 5V and 2 for the output voltage proportional to the measured current.
Next thing i will try is to use an OP amp that will keep the output impedense of the current sensor as is and wshould not be seen by the MBB so that mod should succed to fake a half current signal and allow full throttle and power to the motor.
Here is the thread i made on E-S about that:
http://www.endless-sphere.com/forums/viewtopic.php?f=10&t=39228&hilit=pimping+zero stay tuned!
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Topic: Mod for Enabling full power to the Zero 2010 and 2011 S and DS (Read 2144 times)