So gearing up a 1950-8 will not cause excessive esc heat? The whole reason I want to upgrade is to avoid heat. I feel like Im constantly walking the line of to much heat in either the motor or esc.

On 5s (18.5v) the 1950-8 will only be spinning at around 30k rpm. The 1950-7 will be at about 35K rpm. Will I have a problem with the 1950-8 not hitting its sweetspot ''powerband'' at only 30K rpm?

Which of the 2 would be better for nice cool running and 40-45 mph but still have nice punch? Any sugested gearing for the 2 motors for 40-45 top end on 5s? I'm running a Gmaxx revo with an emaxx tranny and revo diffs and a Quark 125.

My calculations say that it would need to be arond 51/18-20 on the 1950-7, and 51/20-22 on the 1950-8 to reach 40-45mph on 5s. Does this sound reasonable?

Yea, that sounds about right. I run a 10XL (somewhere inbetween the 2 as far as KV) and it runs pretty cool on 16 cells geared 20/51.

I see that the Lehner 1950s are all called out as 1800 watts and the 1940s are listed at 1450 watts. What are the Feigao XLs?

Can anyone give me an assesment from experience on how ''powerful'' the Feigao XL motors are vs a Lehner 1950. How are the 1940s vs the 1950s. I'm assuming that both the 1940 and 1950 are more powerfull than the XL's.

Just trying to get a feel for how much more powerful a lehner might be vs a feigao XL.

The XL's I believe have around 1800 watts also. Not positive on that. But the main thing about the 1950's is that they have segmented magnets, run cooler, smoother, and more efficient.

To make things more confusing, I emailed Mike about getting a 1950/8 and he said it may be awhile, and that he was going with Neu motors now. More efficient and cheaper than the Lehner he thinks. It's a 4 pole design and looks to have an open endbell from what I've seen, but there sure are a lot of choices in that brand, that's for sure. I dunno which one would match to a 1950/8 though, Mike never got back to me on that one.

http://www.fastelectrics.com/blmotors.asp

I'm thinking a 1515/2.5D or 1515/1Y? Looks like they are available with cooling fins, too. I'd buy it from Mike of course, just sharing the motors I've found so far.

The 1515/1Y is tyhe motor I have been running - around 2200 Kv. The 1515/2.5d would be similar to the 1950/8, bu the Neu motors have a little more torque so you can actualy push the a little further than the Lehners. I will get a few choices when they arrive. I will still carry the Lehner motors as well, so the 1950/8 isn't going anywhere. The Neu motors have a few advanatgages, though, so I will stock these up first - anyone needing the 1950/8 will certainly be taken care of.

the feigao xls are probably rated for around 1200-1500 watts or so. Don't let that figure get stuck in your mind, though. The Feigao xl motors will feel similar to the 1950 motor in power output - it will just overheat and fail much sooner.

Mike, how do the Nue motors like the 9920? As long as it doesn't cog worse than an XL (which doesn't hardly cog at all)...

Neu motors are 4pole, the 9920 doesn't like 4pole motors.

Exactly - the BK controllers run the Neu motors, but they end up with the strange breaking phenomenon that the MGM controller had before the recent software update(if you coast before braking, the rotor locks when you hit the breaks).

When will the Neu motors be in stock, Mike?

Next week with any luck.

I'm also curious when the Neu motors will be in stock. If the price tag on the 1515/1y (seems to be the best motor all around for 4s Lipo) isn't too bad, I might consider saving up for one for my new 1/8 buggy.

EDIT:
Nevermind, Mike beat me to it.

So the Quark is the chioce for running these Neu motors?

If it is.... It looks like I will be trying one of these ''new'' :rolleyes: Neu motors as well.

The price list on www.neumotors.com lists the 15 seris Neu motors at $280. So they should be cheaper than the Lehner 1950's.

The Quark and MGM controllers both work well with the Neu motors. They are the best available motor IMO. Lehner "19" motors are still high on the list, but the Neu motors are more for less or the same for less - and they have slightly longer threads for the motor mount screw area as well. I am extremely impressed with my current setup on my g-maxx. I haven't gotten either component over 145F during hard running in relatively hot weather.

Did you dialed back your system, Mike?

They look nice. You got the one with the heatsink, right?