Savage on 6s which motor, 10XL or KB45 8XL???
 

My setup is....

FLM extended 12-13lb Savage
zippy-R 4500 21c 6s lipo
Turnigy HV 100amp 2-12s lipo esc
cc ubec

Which motor do I want, a feigao like a 10XL or something or go with the big can KB45 8XL? Will there be a big power difference between these two motors, they both have very similar kv ratings. I leaning towards the feigao 10xl because the heatsink clamp that I already have will fit it and mainly because there are specs on it showing that its max amp draw is only 66 amps which is way below my esc's ratings.

I dont know if the kb45 8XL will draw too many amps and not have a reliable system. And they are priced about the same so I am kind of torn between the two at the moment, any help on picking the right motor will be greatly appreciated.:smile:

My number one priority is reliability, my last setup of cc phoniex 125 esc and 7Xl on 5s lipo cogged like crazy no matter what esc settings I used, I think the motor was just too hot especially considering the voltage being used on it.

I think that a 10XL would be too hot for that setup. I'd go with an 11XL.

and yeah, the 7XL 5S combo was WAY too hot. 5S + 10XL is a nice running system.

Sleeb

i agree id go with the 11xl its should run nice and be very reliable

Yep, 11xl would be the way to go on 6s. I have the same setup and will be using a 14xl on 9s or 10s.

I take it the big kb45 8xl 1700kv is also too hot for a 6s setup???

Is a 11XL and 6s setup going to be faster than a really fast nitro engine? With my previous setup of 5s and 7XL when it wasnt cogging which was 99% of the time I could tell its power would totally destroy any nitro engine out there.

I plan on sticking my cc phoniex 125 esc and feigao 7XL in my jammin buggy and using mechanical brakes on a 4s lipo setup, hopefully that setup wont be too hot and work good. The 7XL with 14 gp3300 cells worked fine with the phoniex in my savage it just wasnt all that fast, but my buggy is alot lighter than my savage.

The kb45 8xl would be fine I think. I think the 7XL/4S combo will be a good one too.

Yeah the 11XL/6S will be fast. Faster than you want, probably.

There is a HUGE difference in power output between a Feigao 540XL and the KB45XL . Just out of curiosity I bench tested a KB45/10T spinning a 14/6 aircraft prop , you may not see it in the video but it turned that prop with as much ferocity as a 60size nitro motor

http://www.youtube.com/watch?v=wqN4fsWxKrU

Now the kb should be more powerful than the feigao. However, it uses a 6mm shaft and 30mm bolt pattern for m4 thread screws. That means that it will not bolt up to the motor mount, or use std pinions.

Main problem is the larger diameter, which will most likely cause the battery not to fit in the chassis. I was going to use a kb xl in my savage and then found the motor issue with the batteries. Now I am using an aveox 1300kv motor on 8s lipo. Same diameter as a feigao xl, so my batterys will fit.

My Savage broke the magnet of a Feigao 12XL on 10s2p A123 geared for 60-70mph, but my KB45 10XL has been pushing the truck just fine, doing the same thing. It doesn't even get as hot :angel:

I have a kershaw design motor mount so its way out of the way of the battery. And drilling a new hole for the kb45 motor isnt a problem nor is turning the shaft down to 5 mm for me. The thing I am worried about the most with the kb45XL is will the can fall apart without a clamp like a feigao motor does during a crash?

If the kb45 8XL is more powerfull and runs cooler that sounds what I want especially on a big heavy 13lb savage thats locked in second gear.

The only thing I see with the KB is the amp draw. 136 according to that video and on a svage I would imagine it would be a good bit more since the load will be alot more.

hmmm....

Thats not good, I need LOW amps with a 100 amp plane esc. I think I will stick with either a feigao 10XL or 11XL.

That was a huge load on that motor spinning a 14 inch prop , no Fiegao's would have even come close to swinging it that fast and the amp draw would have gone well beyond what the KB drew given the same load . all motors have there sweatspots and ultimate setups KB's would be good on models that go well beyond the 10 pound mark . I have had both motors taken apart to compare the guts and the KB is is atleast 50% larger than a Feigao

Ok, so the kb may be the better choice. If you can mount it and turn the shaft down you should be good to go. I would suggest a higher mah lipo, as that one you listed is only good for around 2.5hp, and that is pushing it.

what about going with the 1200kv kb45xl and using higher voltage? i have the 1700kv in my maxx and its a monster. running 6s2p a123, so a little lower voltage, i put it on a whatt meter and it pulls over 1100 watts with the wheels off the ground. i couldn't run fast enough to see what it does under load since the meter doesn't log anything. i wouldn't choose the 1700kv on a 100amp esc, although i ran mine for a while on a bk9920 on 5s2p and it seemed to do fine until i hit some water.

also, as far as the motor coming apart, mine did on the front endbell. it would pop over the threads and start to spin. some thread lock fixed it.

go higher than the 10, i run an 11 XL and my bro a 12XL both with that esc and 6s.

Lincpimp I hope I didn't offend you.....:oops: the point I was trying to make was that if you can shoe horn the motors in they are great for the heavier models

You have a revo with the turnigy HV esc and 11XL right? How fast is that setup on 6s, what kind of lipo are you using? What kind of temps are you getting, and runtime?

Sorry to sound like a question box but not too many people have experience running the exact same setup I am looking at getting.

I run my own made packs, they are two 3s1p 4000mah HECELL U series Gen 1 cells (toted as 20C continuous, 25C surge) run in series.

I haven't been able to take it for a real good run since completion - I love building them but rarely get a chance to run it. I ran it with full packs for about 10 mins out the front, did a few high speed passes and generally just drove around a bit on the empty road - I haven't gone through a full pack yet, but with my batteries I'd estimate at least 15min runtime in my driving conditions.

I run 16/38 and the top speed is pretty nuts - easily as quick as the stock 3.3, even a bit quicker with heaps more torque - it wheelies in second pretty easily.

I haven't noticed the batteries get any warmer than ambient. The ESC gets maybe marginally (4 or 5 degrees C) above ambient, and motor is running a RCM heatsink and is the warmest of the setup - but nowhere near bad warm. I haven't got a temp gun, but can easily hold my hand/finger on the motor can for as long as I want without it burning. Just feels a little warm, maybe 40-45C at a guess?

I'm sure if you were going hard in the dirt with the motor revving a lot harder you would get higher temps.

That said, its a pretty sweet budget setup - don't count on racing with it though. The air ESCs have a soft, low torque start to protect aeroplane gearboxes. While this (i imagine) would massively reduce peak current draw, it also leads to a bit of a delayed response if you back off then gas it again. This pretty much makes it near impossible to power slide or balance it properly in mid air.

Also as a warning, on my brothers (running in a savage), his brakes were very slightly engaged when he first set it up, blipping the throttle with the wheels in the air made smoke pour from the ESC after about 30 seconds. Disassembly of the ESC revealed a black mark on the PCB, but nor near any components at all. It hasn't seemed to affect the function of the unit at all, but maybe he was lucky.

Sorry for the long post :oops:

Cheers

Sam

Not at all Peter, you have more experience with the KB than I do! I have 3 of them, 10l, 8xl, and 10xl. I have not had a chance to run them in anything yet, but I have purchased a few 6mm bore pinions and removed the front endbell and tapped it for a conventional bolt pattern.

I need to get the Aftershock conversion started, as I intend to run the 10xl on 8s-10s thru a HV85 esc. The motor should be ideal for the heavy truck, just hope my lipos can keep up!

I originally thought that BOOGIE was using the rcm chassis, and there is very little space for batteries with a motor bigger than 36mm in diameter. Since he has the kershaw mount and access to machine equipment, I see no reason for him not to run the KB.

one thing about the kb's i'm kindof learning about is some of them have a balancing issue according to the folks at rumrunner forums. i haven't really noticed this much from mine, but i do know my bearings are due for replacing. i'm going to pick up the high speed bearings sold at off shore electrics.

I think there was a bad batch that had balance issues a while back mine included but I am pretty sure that has been resolved , I had mine dynamically balanced . was smooth as silk after . I turned two shafts down in my lathe for RRR KB owners and both there motors were very smooth also

Well I decided to go with the KB45 8XL 1700kv with my 6s lipo and turnigy 100 amp HV esc. I hope it runs good as the turnigy esc is supposed to be pretty cog proof and I am still under 40,000 rpms.

I havent decided which will be easier drill a new hole in my savage motor mount or remove the KB45 end bell and drill and tap a new hole. I am leaning towards drilling and tapping.

Drilling and taping.........:yes:

What is the amp draw rating on the KB45 8XL???

Also if it only has a max of 40000rpm why is it rated to 36V max, when the 1700KV and 36V's places the motor over 60000 rpms? Another thing is according to the specs with the voltage rating and max watt rating what they are the motor is a nice 100amp draw motor,unless the specs are off somewhere.

Well I bought everything this week should be here in the next week or two from hobby city.

I ended up getting....
Turnigy 100amp HV esc
Zippy-H 4000 mah 25 / 35c lipo
And a KB45 8XL from offshorelectrics.com

I wanted to get the korean made zippy-R but they were all out of stock, but the 4000 mah pack should work good as its constant current rating is at my esc limit and the burst is far above my esc's burst current so I should be good to go.

I think next time I will go A123 though, maybe have battlepack.com make me a 6s pack in the near future.

Just a update for you guys....

I tried out my savage with the turnigy HV esc and a feigao 7XL I had laying around with a zippy 4s 4500mah 21c lipo and it kicked some major butt. Yes the turnigy does have a soft start to it which I kind of like. Anyway I was either using a 16 or 18T pinion with the 7XL and the top speed is about the same as when I was running a axial .32 nitro engine in it.

Wheelie's are still possible with this setup but also avoidable too if your smart with you trigger finger. Anyway I am very impressed with the turnigy esc, lotta bang for low buck.

I plan to install my kb45 8XL in the next day or two and try it out with my 4s and 6s batteries. I am starting to think that the kb45 8XL & 6s lipo will be way too much power after seeing this thing go on ONLY:intello: a feigao 7XL & 4s setup.

I will keep you guys posted....

Hav u considered goining higher voltage

:oops:I wish i could find someone to turn down the shaft of my kb for me:whistle:

Do you want me to have that done while I have it apart?

Mike should start doing it and drilling and tapping the holes as well. Or Linc lol ^^^

Not going to even try to compare to Mike! I do have a really good machinist that is a good friend of mine. I have him do alot of my gunsmithing, and he does not mind fooling with rc stuff!

if you want crazy power, go for the Kb8xl, but be prepare to pull some crazy amps..... it's not too hot for this motor.. if you want some powerful.. go for the 11XL or 12XL.. it's already plenty for the savage... :)

It would make things on my end much easier. Should I run my kb45 8xl on 5 or 6s? anybody have any suggestions?

Ok, I will have it turned down. You want 1/8" pinions to fit, right?

my votes for 6S.. only 38K rpms...

ha ha. 5mm. Thanks man, I don't have access to any worthwile tools. aqwut is right 6s, just need an MMM...............................

You guys watch Peter Zichas dyno pull with the kb? I cant wait to see this thing rip!

Aqwut what is the amp draw on that KB45 8XL on 6S??? Any guesses....I need a good basher motor for an Emaxx of mine.

on my MGT.. about 86 Amps with my gearing... geared for 48MPH with 6S...
I hold the truck on cement and give full throttle.. it pulled less than 90 Amps...
52 Spur, 18 Pinion... 6S 3700 25C....