Mamba Max in a Savage?

[Finnster]

Originally Posted by Rtsbasic

I'm trying to avoid smoke coming out hence staying with the 8XL :)

Them temps are very impressive, can't be anymore than what my 9920 gets at the moment with my 9XL. How much does your Revo weigh?

I'm aware I'm riding the limits of the controller..but I think its a safe gamble based on input from your and other people. Never hurts to push the limits a little does it. Well till it actually blows and your $140 out of pocket! :D

RTR it weighs 5.2Kg w/ 14 cells

[aqwut]

Brushless LST 18 Cells RTR, 7XL and 9920, 2 40mmx40mm fans... 7.08KG(15.61Lbs)

[aqwut]

Is that Mamba Maxx really rated at 100A continuous?....

[BrianG]

That's what the specs say. Some people are using them on 1/8th scale applications with XL sized motors without thermaling, so I would say yes.The actual FETs are probably rated for quite a bit more, but the circuit designers have most likely "derated" the rating somewhat to take temperature and other factors into account. Plus, if they rated it for what it could actually do, then people would still push the limits.

[Serum]

Their relative low temperatures are a big plus.

[Rtsbasic]

Wow, 7KG!! Hows that shift? Does 18 cells really make that much of a difference or does it come out a bit under powered? Guess at least you can brag about having a massive truck :D

Finnster, nice, my Savage is only 450g heavier RTR than your Revo, my setup and projected speed should end up rather similar to yours then? With mambamax, 8XL, 14 cells.

[aqwut]

yeah.. the 18 Cells do make a big difference... I will buy a Mamba maxx controller.. and convert 2nd my Nitro LST to a brushless ... again.. I will use the 7XL, I really like this motor...

[Serum]

Yeah, the 7XL is a nice motor, that's the main reason why i think i will love the neu 1515 with 2200 kv as well.

I wanted to tweak it down a bit, but on 4S a 2200kv is nice.

[captain harlock]

Sorry to hijack the thread, my friends, but I have something to discuss regarding low amp controllers with hi voltage capability.

I have the Kontronik Jazz controller which can juice out 70amps surge and 55 cont. It has no heatsink, though.

Is it gonna be a BIG mistake if I use it with 8s lipos ( it can handle 10s easily) with a 1950/10 geared 24/51 in a SuperMaxx?

They say if you use a slower motor with hi voltage, your controller will suck less amps and stays a bit cooler.

So I'm thinking about using that dude in my truck and I dont even care if it blows up, since no one is really interested in it.

[Serum]

1950/10 is too hot. 55amps is nothing for a car. (remember, even the mamba-max controlers are for 1/10th vehicles and can do 100A continues.

but with 8s lipo the 1950/10 is still around 40000 rpm.

bottom line;

your theory is okay, the more volts the less current is needed to get a certain amount of power.

The maxximum power of the setup on 8s would be 1628watts, while a 9920 on 6S can deliver 2200 watts.

if you want to go with that controller i would look into a 700-750kv motor.

with the current setup you are planning on gearing it for 56 mph.

[captain harlock]

I was just thinking on using it to see if it can do me any good.
Right now the 18.149 controller is in the truck. I'll be using 6s for sure. 8s is just a thought.

[Finnster]

Originally Posted by Rtsbasic

Wow, 7KG!! Hows that shift? Does 18 cells really make that much of a difference or does it come out a bit under powered? Guess at least you can brag about having a massive truck :D

Finnster, nice, my Savage is only 450g heavier RTR than your Revo, my setup and projected speed should end up rather similar to yours then? With mambamax, 8XL, 14 cells.

I would think it would be pretty close.

My Revo is a bit of a :040:, but its not too bad. The motor and batts alone are over 1.5 kg! Otherwise the conv did not add much weight. Everything other than the BL is bone stock, so there is a bit of fat to trim, but that's the next project.

[Finnster]

Originally Posted by Serum

Yeah, the 7XL is a nice motor, that's the main reason why i think i will love the neu 1515 with 2200 kv as well.

I wanted to tweak it down a bit, but on 4S a 2200kv is nice.

That's the motor I'd like to get if I replace the 8xl. For now its working well tho.:)

[Rtsbasic]

Thanks for all the help guys, I have a Mamba on its way to me now to test.

Used my new temp gun today, my 9920 was hitting 160F when I was driving the car quite agressively on dirt and grass. Motor can didn't seem to go over 130F though. These felt like the typical temps I'm used to. When this setup is in its next truck I'll make sure theres a fan installed over the warrior.

[neweuser]

the fan on the 9920 will make a huge improvement, should stay very cool.