Annm - I bought the cheapest dir drive 350 watt front tire fat bike kit I could find @ $250, local (ebay).
* I stuffed 2 controllers in the sondors box.
* Brake defeat - front brake defeats the front motor, rear brake defeats the rear motor. Hit both when braking.
* PAS on rear motor only. I found the PAS for the cheapo dir drive to just act like an ON switch to highest rpm using up too much battery.
* 2nd batt is a frog type chinese battery on the seat post. 36v 10ah.
* top speed with sondors tires no PAS = 25mph. top speed with single drive sounders = 19.5mph. Now top speed with vee8 tires = 22mph (no pas).
* distance with 2wd - I was running 20 miles with single sondors motor and 2 batts..... was curious how batt life would be with 2 motors..... I rode 21 miles yest, and sondors motor batt had orange level, and front motor batt down to red, but still both running good with 22 mph top speed no PAS..... no appreciable loss in range, which I attribute to being in the sweet spot of each motor for the speed/range covered.
*** caveat - I add PAS with the two motors to get the range..... I have not yet tested no PAS range with both motors pinned!
another unintended bennie with this arrangement: the stock geared sondors rear motor is for getting up to speed (19mph), and for hills, offroad stuff..... with front motor assist...... then above 19.5 mph cruising..... no power goes to sondors geared motor.... just cruise with the front dir drive motor..... which is prob why the sondors had more batt life left.
One thing to watch is the stability of the front fork with the new 350 dir drive motor assy..... with the big sondors tire up front a no hands ride @ 26mph yeilded bad wobble/harmonics shaking..... dangerous. This is corrected with the vee8 tire.... but still some funky stability up front with the mass of the motor and the fork size/design/angles...... so BOTH HANDS ON THE BARS with 2WD.
Another safety note.... I've got a tq arm coming for the front forks. (Overkill for 350 watt I'm sure).
I also have some aircraft SS safety wire I'll use to lock the front axle to the forks just in case one of the course nuts backs out. I'd prefer a more fine thread....but you get what you get.