Other findings

Running the Aveox system, there is an intense amount of torque using 7 or more cells.  Running parallel 7-cell packs, there is actually more noticeable initial torque than running 12 cells in series.  However, 12 cells gives the Aveox system the greatest speeds and still has significant and impressive torque/acceleration.

The Aveox ESC gets very hot, very fast running 10 or more cells, especially using BEC.  To keep from thermal-shutdown every 5 minutes, I have run different heat sinks and fans which help out tremendously.  Even with the heat sink, 14 cells brings the Aveox ESC to thermal way too fast.  Since 14 cells is too much for even maximum RPM on the motor, I would not recommend going over 12 cells with this motor.

The Aveox motor gets warm to hot running long periods with 10 or more cells.  It never gets too hot to run, though, using a standard motor heat-sink.  No fans are necessary on either motor or ESC if good heat sinks are used to dissipate the heat.  Depending on your truck and driving style, you may need additional cooling.

And, as expected, the sensored-type Aveox system has no sign of cogging ever.  That's nice.  It would be nicer with the addition of a forward, brake, and reverse mode on the ESC.  Currently, you must decide between proportional brake or reverse.

The Hacker Master Car Sport ESC continues to amaze me.  It will thermal only after being abused by over-gearing or running a hot motor on too many cells.  Otherwise, it is nice.  It took several hard runs on 14 cells (pushing the B50 8S motor) to get the Hacker system to high temp's.

The B50 7L, too, stays under high-warm temp's.

My first observations on the Hacker B50 7L system indicate that there is about as much torque as with the Aveox system but hardly noticeable difference if there is much.  It also takes over 12 cells with similar gearing to get the same speeds as with the Aveox on 12 cells.  This is due to the RPM per Volt rating on the B50 7L motor being lower than that of the Aveox.  The Hacker motor can spin faster, so 14 cells on this motor is actually faster than the Aveox was ever capable of going.  I believe 16 cells on the B50 7L motor would bring the E-Maxx right up to 40 MPH without breaking a sweat (getting too hot).

Cogging is noticeable with the Hacker system, as with all sensorless motor systems.  It's just something you get used to.  I notice it most if the car comes to a stop on large rocks, when I'm trying to ease over them.  The throttle catches and it just launches at times.  That's not always fun, but it's a trade-off for extreme power and speed that I'm willing to pay.

After running a full run on (14) 3000 mAH Sanyo 3000 cells with the Car Sport ESC pushing the Hacker B50 8S motor, I was finally able to thermal the ESC.

With the Hacker B50 8S on the Car Sport ESC, I'm getting right around 10 minutes of run-time on 2000 mAH Sanyo cells.  Nothing spectacular, but right around stock and a little better.

The B50 8S is a very speedy motor, but heats the system up way too fast on more than 10 cells.

Impressions of the Dual B50 8S and Hacker Comp ESC dual setup are WOW.  There's too much torque and power in this setup.  I'm having a hard time dialing the gearing with the gears that are available on the market now.  I had a custom spur gear made to help dial-in the gearing.

The transmission, even with SuperMaxx steel idler gears, is not strong enough to withstand the power it takes to move the 14+ pound dual B-Maxx past around 50 MPH.  Standing by for after-market transmission gears now...

The RS4 MT with Lehner / Schulze brushless system is way over-geared at 18/96.  The system (motor and ESC alike) gets hot after 5-8 minutes on 6 and 7 cells, but has never thermalled.  It also coggs noticeably when beginning to roll.  I gotta' hand it to Schulze for making a controller that can get that hot without any means of cooling that can handle the temperatures.  This would be a great setup for someone who plans to gear appropriately.  I'd knock a good 2-3 teeth down on the pinion size if I were you.

Aveox's 36/24/1.5 motor is an excellent 10-12 cell motor for the E-Maxx because of its extreme torque and smooth operation.  Anything over 12 cells is thermal-city.

The Hacker C50 13L heli motor is the most intense motor I have run yet.  However, it takes a lot of cells (16+) to feed enough voltage to it, to be crazy.

The good news is, there is now a transmission gear set at www.thewebmine.com that can handle the power I'm running in the heavy truck.  Thanks Dan!