Need help, Open to suggestions
 

I want to get a new motor for my Hyper 9E Buggy with a lower KV and I'm torn, I'm currently running a 1515 1Y/2200KV

Here's what I'm considering;

NEU 1512 3D 1700KV
OR
Tekin 1700KV

I'm open for different suggestions if anyone has one for different KV's ???

FYI- Running 4s with a 40T spur, My local tracks are small so 40ish MPH max is all thats needed.

Why not just gear down a little? Are you just looking for lower speed, or is the 1515 a little too torquey for you?

Other than that, either of those would be good choices, although I personally would opt for something with a little bit higher kv, like between 1900-2000. 1700kv on 4s is only around 25k rpm, which is fine I guess, I just prefer between 30-40k rpm on the better motors.

I'm running my Tekin 1700 at 19/40 on 4S, and I like how it runs.

Mr. B.,
The smallest Pinion I can run is a 13T, and the tolerance of the fit is very tempermental between to loose of a mesh or rubbing on parts. I had to file fins off a perfectly good new NEU to get the 13T pinion on.
The 1515 1Y runs well and doesn't over heat but I inspire to have cooler temps and the lower KV should achieve this ,yes ?
I have no problem purchasing a new motor, The 1515 1Y will find it's way into another Revo anyway I just want a Lower KV mill to have some gearing options and with the lower KV motor I can run 5s also if I wish, I hope ?
The diffs are geared 43/11, If getting what I want and need requires me buying another motor I'm fine with it, I want my buggy perfect.
With this being said, would you still recomend 1900-2000 KV Mr.Brian, ?
I respect and appreciate your input and suggestions sir, after all I still have a LOT to learn.
Thank You

Reason he can't gear down is that there is limited gearing room on the Hyper 9E with the Neu and Tekin sized motors. I would say that the Tekin 1900Kv motor would be a good choice or if you want a Neu motor you could look into the Neu 1512 2050Kv motor, if you are looking into the later drop me a as I have one I am not using recently serviced. You trim the lower fin and you probably can gear to a 13T pinion I am thinking.

Or, you could do a 3S setup with your current motor. That should work really well too and I have heard of others doing it.

Hows the top end ?
Nice cool temps ?
What Buggy is this in ?

I appreciate that Cain, I may consider that. But with my thinking If I go to the lower KV 1700-1800KV I can run a bigger pinion and have the top end I need with out cramming the motor so tight to the center diff assembly ?
I dont Know, I get what I think is a good idea and confuse myself by thinking to much ? :neutral:
I want to stay away from the 3s, I have one only and don't wish to purchase any more. I just dropped another 400.00 on several HC 4s packs.

I have the Tekin 1900 and I can't imagine a motor that is better than what I use it for. On 4s I can gear it up to 20/46 in my 8ight with temps barely hitting 140f, but typically a 14-17 tooth pinion is enough for most tracks with temps between 110-130. The equivalent pinion in the hyper 9e is about a half a tooth larger than that in an 8ight. 16/46 in the 8ight should be just short of 40mph.

One thing about the Tekin 1900 is that it is Y wound which means it is slightly more efficient than D wound motors and responds better to changes in timing. I stick with zero timing, but if I want a little more punch and rpm, i could just bump up the timing a little. You can't really do that with D wound motors.

You are spot on with your thinking. I think that is why the 2200Kv is somewhat popular on 3S as you get more gearing range, and , its a good motor for the money. Ideally more voltage is better for sure.

I don't think you will have a problem with your KV range, from what I have been reading, seems some of the RTRs are coming with motors in the 1800Kv range now on 4S usage.

Pardon my ignorance, Whats the diff between Y wound vs D wound.
Please explain ??

D is short for Delta and means the coils are arranged in a triangle formation, with the motor wires at the corners.

Y is short for wye and means the coils are arragned in the form of the letter Y, with the motor wires on the ends of the Y.

Thank You for explaining Brian.
Heres the set up as to why I'm considering the much lower KV motors, Whats your final suggestion sir about what KV I need be sticking with ??

http://i88.photobucket.com/albums/k1...z/P9180004.jpg