Neu 1515 or 1521??

[Purplefade]

OK, thanks to all of your input, suggestions and guidence, I've managed to compile everything I've wanted and needed to build my new Savage but the motor. Originally I was going to go with the Neu 1515 2.5D (1700Kv) on 6\7S A123s. Having continued to read post after post after post, I've noticed and started considering the Neu 1521 1.5D (1860Kv) and the Neu 1521 1Y (1577Kv). Not liking to push my motors to the bleeding edge, I thought the 1521s may offer me some additional over head while running considerably cooler with the right gearing and give me more gearing options as well. Cash not being an obstacle at the moment, let me know your thoughts. I want the best possible option to lug around my heavy weight Savage, reliably without having to wait 20 minutes for cool down between packs

THANKS!!
Purp

[crazyjr]

Not sure on the 21's but i got the Neu 1515/2.5d/f (1700kv) and its awsome at 5s, I plan to go to 6s when my MGM 16018 comes back to me, and see how it does

[Purplefade]

Originally Posted by crazyjr

Not sure on the 21's but i got the Neu 1515/2.5d/f (1700kv) and its awsome at 5s, I plan to go to 6s when my MGM 16018 comes back to me, and see how it does

crazyjr, any idea what your truck weighs? I expect my Savage to be in the 11, 12 pound range when it's built.

Thanks!

[jhautz]

I have both the 1515/2.5d and the 1521/1Y. They have both been in my revo. running on 5s and 6s. I setteled on the 1521/1y for the revo just because it was WAY to much motor for any other vehicle I own. They both run without any heat issues on 5s and both get warm (150ish give or take depending on the gearing) on 6s, but still no issue what so ever. In the monster truck I like the feel of the big motor. It winds up a litlle slower than the smaller motor, but it is winds up way faster than the tires can keep grip or send it wheeling onto its lid.

My revo is fairly light for a MT, but I would have to say that either motor will be plenty for your Savage. Neither one even breaks a sweat. I also have a 1512/2.5D which gives a little snappier feel than the biggger motors. I actually like it better for a track motor on 4s than the big motors on 5s. It winds up quick but has a little more reasonable power band to control.

If money is no object then the 1521 is sure a hell of a beast. IMO it just looks bad ass. Pop the lid off and people ususally do a double take at the size of it. Most folks are used to seeing a MM or Novak motor when you say brushless. The 1521 is easily twice the size of a MM motor.

[nl12]

I would use the 1515, are you going to run 6/7s 2p?

[zeropointbug]

Seriously, I have a 1512, and I am NOT running anywhere near it's bleeding edge, this little power house is awesome, like JHautz said, it's very snappy, and 'agile' so to speak. I am running a 1512/3D (1700kv) on 7s A123 and this would probably be a beast of a racing truck, or a basher! If running a 1700kv motor, go with at least 7s A123 when 1p is used, and at least 6s when 2p pack is used.

If you drive it to at least 45,000rpm, the 1509 would probably be enough motor for a MT. The Neu motors like the higher rpms, and to be gear lower, unlike Feigaos.

But, seeing as the price isn't much more, just get the standard 1515 Neu motor, probably the 2.5D if running 7s A123.

A Savage is a beast of a truck. I tried running my 1515 2.5d on 6S and it does get warm, depending on the gearing and that is in a truggy.

For the heavier Savage, I'd try the 1521. Besides, I don't think that a motor being able to spool up quickly will matter with a Savage. If you do go with the 1515, I'd go with the 1500kv motor for 6S

[nl12]

he is running a123s not lipo cells, I think 1700 kv would be better; I agree 1500kv would probably be better for 6s lipo

[zeropointbug]

Yeah, just to add to my post, I think you SHOULD go 2p configuration, a 1p will be worked pretty hard in a Savage. 2p will give you much better performance, and won't add much weight, % wise for the Savage.

[Purplefade]

jhautz - I was thinking the 1521 based on the sheer weight of the Savage, as AAngel says "the savage is a beast of a truck". I did have some concerns about spool up, but am hoping that the offset of the two speed tranny will help with that. But like you said, it's still going to spool up way faster than the tires can take And I couldn't agree more that the 1521s sure look good in a truck!!

nl12 - I'll be using 6\7S2P, one 6\7S1P pack on either side. Depending on the overall Kv of the motor I pick, I'll solder may packs up. I'll probably end up building myself a couple of 6S packs for routine running and a set of 7S packs just for the heck of it

zeropintbug - My MT will be solely for bashing and I'll probably end up with 4 packs. Think the 1515 can handle 60 minutes of "continuous" runtime on 6S2P (assuming about 15 minutes per set of packs)?? I know AAngel mentions that his does get "warm", nothing to be concerned about, but warm and my setup is probably going to be 11\12 pounds loaded and ready to run.

AAngle - Any idea on what your Truggy weighs in at? I know my Revo hit the scale at about 9.5 pounds and my 9XL got REAL hot when I really ran it for any length of time. That said, you get what you pay for in quality, hence my desire to step up to the Nues - can the 1515s take potentially 12 pounds for "a days" worth of running?

nl12 - Yea, I'd probably end up with the 1515/2.5D if I go with 6S. If I end up with the 1521 1577Kv, I'll probably go 7S.

zpb - Yea, I though about that as well, running the Nue to its potential would draw a ton of AMPs from a 1P config, will be xS2P for sure. - Would 7S be to much on the 1521s? I've seen mixed messages saying potentially keep the 1521s to about 28\30K RPM or so or is this just to keep the overall power in check??

Purp

[zeropointbug]

Originally Posted by Purplefade

zeropintbug - My MT will be solely for bashing and I'll probably end up with 4 packs. Think the 1515 can handle 60 minutes of "continuous" runtime on 6S2P (assuming about 15 minutes per set of packs)?? I know AAngel mentions that his does get "warm", nothing to be concerned about, but warm and my setup is probably going to be 11\12 pounds loaded and ready to run.

zpb - Yea, I though about that as well, running the Nue to its potential would draw a ton of AMPs from a 1P config, will be xS2P for sure. - Would 7S be to much on the 1521s? I've seen mixed messages saying potentially keep the 1521s to about 28\30K RPM or so or is this just to keep the overall power in check??

Purp

The 1515 could handle a whole day of continuous driving, I'm serious. Ask any Neu owner.

I don't know how much the Savage weights, but it will be AT LEAST 12lbs

Yes, you will want to keep the RPM of a 1521 down around 28,000rpm, 30,000rpm for the 'Stupid Fast Events'

Here is my scoop on the Neu for trucks, for everyday bashers, or even racing power levels.

1512= choose kv. to achieve ~38,000rpm

1515= choose kv. to achieve ~32,000rpm

1521= choose kv. to achieve ~28,000rpm

This is just based on my experience with my 1512, and you can somewhat guesstimate based on the rotor length between them.

[jhautz]

P-fade,

I didn't realize you were planning to keep the 2 speed. I run my savage with the 2 speed as well.(most people lock it in 2nd gear from what I have seen) Its a prettty fat boy loaded up with the a123 packs too. BUT, with the 2 speed it makes a hell of of difference in the amount of torque you need to get it all rolling. I run my savage on a Lehner 1940/7(2239kv) and 5s2p a123 and it can wheelie at will up to 25mph or so and hits a gps verified 52mph on the top end and I can run it all day long no heat problems. If you are planning to keep the 2 speed you dont need the big beast 1521 in my opinion stick with the 1515. I would almost recomend getting the 1512. My 1940 is probably a 1512 equivilant. Remember with lower gearing in first gear you will want faster spool up to get the acceleration you want at the bottom end in first gear. The lower resistance of the shorter first gear allows less resistance on the motor so it has less resistance to spinning, but it also means that it takes a bigger motor rpm change to get the mph change on the bottom end. Also motors get hot if they are not loaded enough, and 1st gear on a big 1521 could possible be worse for heat than a smaller motor.

The 2 speed is alot of fun for bashing IMO. You can play with tuning the shift point to get the most out of the setup also. I finaly have mine dialed in just right. It actually pops the front wheels off of the ground when it shifts into 2nd gear now. With the electric setup on the 2 speed you will want to move the shift point higher than it is set for a stock nitro savage or it will be shifting way to early and you will only be using first gear for 10 feet and it will shift.

Only downsides to the 2 speed are you need to keep mechanical brakes , and there is no reverse. But the mechanical brakes are actually good in the case of a heavy savage IMO. Braking that heavy load puts alot of stress on the ECS and getting rid of that load helps keep the esc cool.

What speed control are you planning to use? I personally think that you will have more problems keeping the speedo cool on that heavy truck than you will keeeping the motor cool.

BTW: here is a link to my savage thread in the old temp forum. http://www.rc-monster.com/tempforum/...ghlight=savage
The fan on the motor was put on there before I relaized that I didnt need it so dont let that throw you.

I was just making a statement regarding running the 1515 2.5d in my truggy on 6S and it getting warm. In fact I think that I got it up to around 165*F once, but that was geared to bust butt and I was running in grass.

As for monster trucks, I run the 1515 2.5d in my Monster GT on 4S and 5S lipo geared conservatively for about 35 mph. I can run all day with no issues. My MGT goes about 13 lbs with the 40 series Moabs on it.

I just made the above recommendations because it's what I would do if I had it to do over again. I just have to comment again, that when the going got rough the 1515 2.5d did heat up a bit on 6S.

Contrary to what some are advocating with regard to the Neu motors, I still believe that keeping the rpms to about 30,000 is a good target for a truck that's going to get bashed hard. For a 1515 2.5d, that means running it on 5S lipo or something similar.

My only concern with going with the 1521 is the torque. I already break tranny parts with the 1515. With the 1521, it might be worse.

[Purplefade]

jhautz - Love the savage, nice build! What are you using for your motor mount? I've been using the ring mounts from FD for quit a while with good luck, but am looking for something maybe a bit "tougher"? As for bulks, I've found the Golden Horizon 6065 bulks to be very nice and not toooo heavy for what they are. I also use a NOVA RC 7075 diff cup in the rear with K4.6 gears and have had no issues with my setup running my 9XL on 18.5v - its actually held together very nicely.

Thanks for the advice on the 2psd, I'll certainly be bumping my shift points up from what they're at now... Had been playing with it for some time but hadn't considered the troque of the brushless throwing it into 2nd right away... I've also kept the mechanical brakes as I figured for what it was worth it took some of the heat load off the motor and esc.

For speed control I'll be using a modded Quark, love'em and have always had good luck with them. Thought about going with the MGM, but I already own the Quark and it works



AAngel, I hear you on the torque from the 1521s, I can only imagine they're drive train killers if you don't have a light finger!! Also good to hear on your 13 lb MGT, makes me feel better that I shouldn't have any issues with the 1515/2.5d in my Savy. Heat considered, maybe I'll put together some 5S2P packs, see how things go and up it from there temps permitting


I think you guys have once again solved my issue for me, it looks like with the two speed, the right gearing and pack setup that I'll be going with the 1515/2.5D (1700Kv) motor. Shouldn't pose any issue for it with the "lower" gearing of the two speed and give me much quicker spool up than would the larger 1521 as well as save me BIG TIME in replacement drive train parts!!

Many thanks again,
purp

[coolhandcountry]

I got a concern. Is the savage going to have the room for the 1521 neu in the spot you going to mount it.
It does have limits if you put the motor in some spots. Just like to add that. :)