Savage XL outrunner conversion
 

Hi there :na:

I got interested about a direct drive conversion for my savage xl.

so i am looking for a suitable outrunner bl motor.
the problem is that you have to pick the right one for your conversion because of the kv rating.

i am running 4s 5000mAh and a 100A hobbkying car esc.

Well, i choose a few different types:
1st: this one *klick* with 580kv

and here the speed calculation:
2nd: this one *klick*
with 380kv

here the results:
3rd: this one *klick*

results:
Tell me what u think is the best joice. :rules:

Thanks
Regards, DanteX (Andy)

IMO 60 mph is pretty fast for something that big on 4s. I would use the 400kv at 41mph.

Yes, i totally agree with you, 41mph is enough.


I Will order from hobbyking saturday or sunday.

I will keep you guys updated!

Cool, it will be something different!

I have an LST direct drive. I went thru 3 hobbyking motors before I got an AXI. You will want as low a kv as you can get and plan on 6s.

http://home.surewest.net/~myoldjunk2...b/CIMG4017.JPG

old pic, its changed a few times since then

Nice conversion.
I have to plan on 4S because i would need a new ESC for using 6S.

I recently bought a used Revo that will be converted to BL.
So this project has to wait until i have to order something from hobbyking.

You'll need a new esc then. You'll need a motor with a high kv ( relatively speaking) to run 4s, and that means more current draw, especially from a standstill- cogging may become a problem is your esc isnt able to be adjusted for multiple pole outrunners...

here is how it is now.

http://home.surewest.net/~myoldjunk2...b/CIMG1988.JPG

http://home.surewest.net/~myoldjunk2...b/CIMG1989.JPG

http://home.surewest.net/~myoldjunk2...b/CIMG1990.JPG

You'll need a low KV motor and 6s or more to get it going. I tried 4s first since I already had the batteries. Smoked that motor in less than 2min. Then I went 6s and lower kv and the next motor lasted 10min. The axi with a fan is ok but it needs to be a lower kv (4130/16) or a bigger/longer motor. I even swapped the diff gears out for the muggy gears which are a lower ratio. The MGM esc cogs pretty bad and needs to go back to a dead stop allot. The MMM only cogs alittle and almost never needs to restart. once its moving it has the power to wheelie the truck on its roof.

6S? -> So i guess i have to buy a MMM or so.
Oh, no, i have to make a new battery tray when using 6S, now it is bent aluminium with foam inside for protection.


@Desmo: nice ride and thx for the pics :)

Hey guys, found this a really interesting thread.

So I assume you'd need a low KV as it requires a lot more power to get the car moving being direct drive.

Quessies! :rofl:

1. How do you put the driveshaft on the back end of the motor?
2. What are the benefits?
3. With 300-400kv motors they must be excellent runtime and maintain very low amps?

If you can get them to startup properly you will be ok.

Most outrunners have a shaft that can be pressed to stick out the front and back. That way you can install a cup for the dogbones on each end.

6s is the way to go, and I can recommend axi as a good motor choice. I have a few of the 28 and 41 series outrunners and they do very well.

@Nick:

Like lincpimp already said, you can press the shaft out, but i have to measure the diameter of the drive shaft on the stock savage transmission.

If the diameter is not the same i have to turn it down to the right measures.

I planned this conversion because of

• the low center of gravity,
• less gears (-> less abrasion),
• more space in the frame for battery and electrics
• and good looking :yipi:

I have two (soon 3 with Revo conversion) projects going on, the savage and my scale crawler (ax10 with rc4wd wheels and blazer body...) and thats why i have to save the money for goodies like a good (or better) esc. :neutral:


regards, DanteX

I think the drive cups I used on the axi motor are from a savage.

http://home.surewest.net/~myoldjunk2...b/CIMG1991.JPG

http://home.surewest.net/~myoldjunk2...b/CIMG1992.JPG

that's a bad aaa lookin set up. Is that a nitro conversion? of course I know it's home modified.

Home made, it was missing the tranny and the main plate was cut up already so it wasn't a big deal to cut it up some more. Only the main chassis plate is modified.