Bionx 250 extra speed

[Wcarrothers]

Well put around 100 miles of commuting so far.. And I really like it..

One thing I want to work on is setting the regen breaking back to give full regen when activated by the brake sensor. I can't remember which of the commands took that away. course it might be one that causes another thus might be this way for ever. But basicly now you get min regen with the brake switch but could switch it on full with the - button.

Now for the fun.

for the most part I run 3 blips of assist and only some times go to 4. If I run 4 the entire way I end up draining the batterys to much to make it back and forth (24 miles total) with out completely draining one battery or the other (I charge the bionx battery at home and the other at work so they are some times out of balance).

Now with 3 blips you still have assistance above 20mph which is the best part of this mod. or in other words the system no longer gets you to 19mph and then leaves you with no help.

I can easily average 20mph on my commute and best is 22.6 so far.

b.

[Wcarrothers]

Well for some reason, I thought I read a while ago that the bionx controll used 48v FETs. Not sure why I thought that but thought that is what i read some where and had not had time to double check. But reading around sounds like the newer ones (mine is a can based system that I got in 2011) it should have the 75 v parts. Which got me thinking, I have a second 2590 battery sitting here which would give me another 14-16 volts. Which wold put the max voltage maybe around 60 when fully charged ( my 26v bionx battery measures 28 when charged and the others can gt to around 16). I am sure the voltage when in use drops some so would have a good safety margin. Wondering if that would be to much. I work with fets all the time at work, so i know they can be easily damaged, but also ive swaped plenty of them, assuming when they nuke they dont damage the boards, or take the gate driver chip out should be fixiable.

Anyway thinking about giving it a try, if nothing else to see what another 15v might give for a top speed. Guessing it probably is a moot point as I would suspect the extra voltage would cause my range to drop making even more making running that way impractical. Course also the issue that there would not be enough time to charge 2 2590 batteries during y work day seeing I only have a single battery charger.

B.

[Wcarrothers]

Well some where between 45 and 61 v the smarts in the bionx will refuse to turn on the FETs in the hub. .

Anyone know where the actual high voltage cut off is set?

B.

[Wcarrothers]

any way, I did get a chance to wire up 2 of the 15v 2590 batteries on top of the stock 26 and connected up, measured about 60-61 v at the hub connection. With the 2 batteries when testing in the basement the throttle would not respond after peddling to get the wheels started. Normally with the stock or single 15 v in series it would accelerate to 19 or 27 mph. With the e tra voltage I'm guessing the hub was detecting and disabling the FETs to protect for over voltage?

Can anyone verify a programmed voltage max for the hub power input on bionx systems?

B.