With the high Kv motors I have it also does cog unless I go with a 15-16:1 ratio. Now it doesn't cog at all when I used a 5.5T (Half the Kv of the 2.5T) in my KX-ONE. That is why I only run them in sensored mode with low gear ratio, which is very smooth. The reason it didn't cog with the Medusa is because of the lower Kv it has.

Yes, that is something the mamba can't do. You have to ease into the throttle to get a higher kv motor going.

When you do your review with the Mamba, try and run the same set up with it.

sensorless startups will always cog with a higher kv motor that has a tall rollout. It just takes too much tire rotation to get a lock on the EMF feedback.


Good job on the ESCs lutach, I like seeing guys get what they want.

You're 100% right John.

These are still being tested and there could be more improvements. The factory will be doing a 40A micro ESC as well (I hope lol) as 2 versions of 1/8 scale ESCs. It's still not easy trying to get them to do exactly what I want and I'm not letting anymore of my ideas out.

I allready know the answer with that one. It' won't do it.

Ok lol.

Did a few test runs with 4S1P A123 in the Rustler geared 58-15 and 58-25, with the Medusa 4800kV motor. Peak Amps between the two gear ratios was off by only a few digits.

I used a Dimension Engineering park bec instead of the built in BEC. I peaked at 1125W, 181.36A@5.58V
Power Graph

Have you noticed any difference between the 2 frequencies?

Was too cold last nite to run both 8 and 16khz to record a difference in efficiency. I will warm up my battery pack before I run the frequency difference test for max output.

Ok sounds good.

I ran the 200A esc on 6s1p A123, medusa 4800 50mm, geared 58/12 and eagletree showed 1700W peak. The pack was cold when I used it.
weather low fifties.
batteries cold
16khz esc setting
timing normal
initial acceleration high

PEAK 1730W=185.72A&6.1V
tires imex 4.25"
motor got to 100F in less then 4 minutes.

You are crazy lol. We definitely need better batteries now. Goodness gracious.

I should try those packs Mike sells and see how low I can pull those with this ESC.

Little video of the 1.5T working:

http://www.youtube.com/watch?v=KC_1VgrSp2c

It takes a little bit of power to get it moving, but the 200A ESC doesn't seem to mind it.

Nice video. That thing must be geared to the moon!

For that motor yes, but it's a speed car lol.

What speed are you hoping to get out of it?

As much as I can. With a 2.5T geared 35T/69T my TC3 went 73mph. If I can get 100mph, I'll be good lol.

Luciano,

Can you post or PM me with the 6s ESC set up procedure? I'm just now getting around to some holiday projects and don't seem to have any reference documents in the package.

how're you going to keep that motor cool? Even just for speed runs I'd imagine it getting red hot...

It's a secrete.

The suspense! :lol:

I can't give away all my secretes :lol:. Plus a certain someone would be on my neck if I tell what it is :lol:.

oh... You better not let anyone know then!:whistle:

Or else..:diablo:

Is that intentionally misspelled to suggest some type of liquid cooling system??? :lol:

If I say it, that person will be in here talking about how he hates it and all :lol:.

English is my second language and Portuguese doesn't come out any better :rofl:. I guess I got eeeeeeeeeeeeeeeee happy :lol:.

That just gave it away. It's OK, I wont tell. :wink: :lol:

I did say it already when the motors came in and even posted pictures of it lol. You guys are lazy lol. All the high Kv motors have a fan.

...... I guess I forgot? :neutral:

Crap, I posted pics in another forum. My fault :lol:. Here they are:

http://i260.photobucket.com/albums/i...h/DSC01710.jpg
http://i260.photobucket.com/albums/i...h/DSC01713.jpg
http://i260.photobucket.com/albums/i...h/DSC01716.jpg
http://i260.photobucket.com/albums/i...h/DSC01717.jpg

What??? Does that say 18102 kV? :oh:

it sure does.:yes:

What speed run car is this going in?

Got to love it. It's awesome how the 200A esc runs it too :lol:. It's going in the same car that's in the video, my TC3 which has been taking the power and beating like a champ.

The 120A ESC armed and ran with 7S1P A123's. Ran a Tekno Neu 1512 2y geared 58/25 in the Rustler and blew a tire doing donuts in my garage.

You're crazy :lol:. I can't wait for the weather to get better :lol:.

How many volts are you using in that video??

2S lipos.

So, umm, that's geared for ~200mph??? Looks like a huge pinion gear for a kV that high... Which means if the ESC can start like that with such a high demand on it, then the rest of us are all set. :smile:

:lol: All I want is 100mph with 2S lipos. The ESC should be more then capable of delivering the power needed. I might also make a custom chassis and see if I can get a custom lipo made as well to be able to handle such a hungry set up. I'm also going to try and get my hands on some crazy powerful lithium cells that will not even break a sweet if the AMPs goes to up to 500A.

Edit: I do have bigger pinions if that looks small :lol:.