Like when you reconfigure a Lehner from delta to wye; you multiply torque by 1.73, but also divide the kv by 1.73.

Yeah, but that changes the KV, which also takes the torque with it;

What if you have a Y with a kv of 2000, and a delta with a kv of 2000, in that case, the torque isn't sqrt 3 higher for the Y. So it's not a fact a Y has more torque than a delta. Get my point?

Yes, i agree, it's whatever Kv. you have. It is per equivalent turn count.

I just read briefly over most of the posts in here (good stuff guys; understood a good deal of it, woooo!), and I may have missed it, but could it be perhaps Aveox (as was copied and posted by the OP) was referring to sensored motors?

The only way I've experienced a wye wound motor acting poorly is running my Novak in reverse direction (this is on a sensored ESC though; I've never tried it on my mamba or anything yet). Performance goes down hill big time. The timing in those motors is "built in" by the Hall sensors, so it's like running retarded timing when run backwards, no?

If they're referring to strictly sensorless wye and delta winds, then I have no idea what the hell they're talking about, and you should probably ignore my post.:D