Neu 1515 or 1521??

[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.