You've got the r&p ratios backwards. The RR is 42/12 (3.5:1) and the BR is 40/14 (2.85:1) so the stock baja rey gearing is considerably faster.
What is your aversion to spinning your motor faster? I generally shoot for a max of ~50k rpm for a given voltage, which is around 3900kv for a 3s, or 6000kv for 2s, then gear down for the desired speed. A fast motor geared low will run smoother and cooler than a slow motor geared high...so the fast motor geared way down will actually have a smoother, slower startup GROUND speed.
My vote is to give the stock motor a try, but gear your pinion down (10t is a good starting point) for 3s. If it's too fast for your intended useage, switch to RR r&p's instead of a lower kv motor. I definitely wouldn't consider a lower kv for 2s use.
First, thanks for the reply. I know you've had your BR for a while, so I'm certain you know what you speak of (plus, you've been in the RCC forums for quite some time). I don't have any "aversion to doing my motor faster"...remember, almost all of my earlier vehicles are for off-road racing. [emoji16] However, as you said, guess I did have the BR & RR r&p gearing thing backwards (had I done the math, if have known that - 2.85:1 for BR, 3.5:1 for RR). Such is life.
Touching on the 2S vs 3S matter, to start work, I'll be running only 2S. While I plan to give it plenty of outdoor use, it will have to start it's life as a 2S-only vehicle. I live in San Jose, CA, and there's not exactly a lot of outdoor places to run in. Thankfully, we do have an excellent indoor track at one of the LHSs), but only 2S is allowed. However, once I can afford a second motor (2-3 months), which would be for 3S-only use (read my previous posts for my 2-motor/pinion idea), then if have the option for running 2S indoors, and 3S outdoors.
So...once again...I'm back to not knowing which motor to go with. You say "nothing higher than 4100kV, except that the only higher-kV options for the ROC412 HD are 3100kV (what I was looking at), and 4200kV. If I were to go back to considering the Pro4 HD, the choices are 3500kV & 4300kV, which, by your wording, would appear to be "worse" choices. Now, I could go back to what my original choice was - a Holmes Hobbies Puller Pro R 540-L V2, which is 4100kV, but can also hit up to 60K RPM. All of these choices are powerful, but also efficient, motors. The only other thing I can think of would be to go with an all-Castle combo, except I don't find any 550-can motors in the 3500-4100kV range.
EDIT: I almost forgot...another party of the reason for replacing the motor is that I'll be replacing all electronics. Obviously, the underpowered stock servo needs to be replaced, but I'll also be replacing the Rx (I prefer to use my 7PX for all my vehicles), and the ESC (with Mamba X). In replacing 4 of the 4, might as well replace the fourth. Also, some brands of ESCs don't work with certain brands of receivers. I discovered this when I went to replace the receiver on my first Traxxas vehicle. Let's just say the Traxxas-branded ESC "doesn't communicate well with Futaba receivers".
~ More peace, love, laughter & kindness would make the world a MUCH better place [emoji1690]
