New Slash with Mamba seems slow (New Motor Here)

[nascarkeith]

I am running a a stock slash except for a Mamba Max 7700kv motor with a venom 7 cell 3000 mah battery. I get about 8 minutes of run time and it seems slow. I have tried to understand lipos but they just seem to comlicated. Below is a video. Any help or advice to get this thing running like I know it can would be appreciated.


www.youtube.com/watch?v=oaJgO0_sEOI

I found a way to help keep the velcro on the side of the chassis. I put a zip tie aroung it.

So far it seems to be stuck to the body pretty well

[canucklehead]

Looks to me like you have it in training mode.

[daddydancool]

did you set you esc to your radio? because with your setup your suppose to be hell fast! actually a bit too fast, you will overheat your motor and esc with a 7700kv for offroading, unless you have a really large spur and really tiny pinion. and even with this setup, it will probably overheat,
if your esc is already set properly with your radio, connect the mamba max esc to your PC and reset all the config, the curve throttle might be wrong right now.
hope this help!

[nascarkeith]

Good info guys, thanks. This is my first brushless set up so I am learning all the set up type stuff. I was unaware that the mamba esc had a training mode. I bought an XTM X-cellerator that had the motor and esc in it for $60. I doubt the guy ever cleaned it so I am going to clean and lube everything this afternoon. Then, set it back to the factory settings in castle link, program it to the Rx, and see what happens.

[konaman]

far as i know the mamba does not have a "training mode"... but it could be programed to only out put what ever % of power you want between 0 - 100%... as you said go ahead and reset the settings with the castle link and program it to the radio... also what is your gearing with that 7700kv motor.
.

[nascarkeith]

Gearing is stock. Thanks for the help.

I'll post some feedback tonight after I get off work and check things out.

[robbo89]

i am honestly surprised it is running as well as it is on that battery. i installed a sidewinder with the 5700 and tried to run it on my venom 5000 nimh battery, it would only make the truck move about five feet and then go into an auto-protect mode and shut it down for a few seconds. i called castle and they said buy a good quality lipo. i bought the maxamps 6500 30c lipo and it is almost too much for me to handle now. long story short, you will probably need a new battery.

[nascarkeith]

Thanks for all the help so far. I think I am on the right track.

I couldn't get the screws out of the motor to fully clean it but I did manage to get some lube inside of it. If you got any tips for taking apart a Mamba Max, I'll be glad to hear them. I noticed that there was a new version of castle link so I downloaded that. Then, it updated the firmware in the esc. After that, I reset everything back to the original settings and programmed it to my Tx/Rx. I also changed my pinion to a 15 tooth. I took it out for a spin and it did fine.

I came back in and changed the start power from low to high to see if the battery would puke out but to my surprise it did fine and even had a little more punch.

I didn't have a good charge on the 7 cell so I ran a 6 cell 3000mah battery in it. I think it did as well today on 6 cells as it did before on 7. That was on an old battery that has been used in a rock crawler for over a year.

Here is a video comparison.
www.youtube.com/watch?v=Rsz66Dix9BM
By the time I got my 7 cell charged it was to dark to get any video. It seems pretty fast to me. Fast enough to hit a jump wrong and cartwheel for about 20 feet.

I have seen a slash on 7 cells wheely on youtube. No telling what the gearing was though. I really can't afford to go lipo right now. I think I will be happy with it on 7 cells and maybe get an 8 cell battery later. I just can't afford a new charger and all the stuff to convert to lipo.

Thanks for helping me out. Let me know what you guys think and if you have any more suggestions.

[daddydancool]

but still, it's suppose to be faster. Did you pull the trigger to full throttle before turning on the esc, than full brake and everything? i run mine with a 18t pinion, mamba 4600kv motor and 2s li-po and it's way faster and you setup is suppose to be faster

[nascarkeith]

Nov 12, 2008 22:22:45 GMT -5 daddydancool said:

but still, it's suppose to be faster. Did you pull the trigger to full throttle before turning on the esc, than full brake and everything? i run mine with a 18t pinion, mamba 4600kv motor and 2s li-po and it's way faster and you setup is suppose to be faster

Sure did. I don't know what the deal is.

[Steve]

My opinion is that you are running a way to high KV motor in your Slash. There have been a bunch of guys running the 5700kv and over heating their electronics.

The 7700kv motor draws ALOT more current then the lower KV's. Plus your a running a fairly low MAH pack so its not going to last that long. If I were you I would step down to a 4600kv motor. It will still be plenty fast, but you wont have to worry about over heating and I think you would be much happier with its overall performance.

And dont be scared of Lipos, just read up on the dangers of them and what you need to do and your set, its really not that bad. Just make sure your charger is Lipo specific.

[idrockcrawler]

I am thinking there are a couple things going on... I'd use the above advice and change things one at a time until you get it running how you want. I have a 5700 in mine and I am running 7 cells 4800mah and can wheely and run for 25 minutes. Lipo is nice, but I am in the same boat as you.... it's expensive to make that switch, and for now, I think "old school" Nimh will work fine for me.

First step I'd try is a new battery with as high a mah as you can afford. I'd also see if you can find someone willing to swap their 4700 or 5700 or a vxl motor with your 7700... good luck!

[Steve]

The VXL motor is another great option. You can use your Castle ESC with it and sell your 7700.

[nascarkeith]

More great info guys. I basically got the motor for free that's why I have a 7700kv. I bought the motor set up in an X-cellerator for $60 then took the motor out and sold the truck stock for $74.

I think I can work with switching motors. I just can't afford the switch to lipo. First baby is due any day now. I found a 6900kv motor I can get shipped for $61. Would that be any better?

I basically have more motor than my batteries can power, correct?

[robbo89]

it is really just the wrong motor for the application. it is drawing too much power and producing more high end power than usable low end power, it will eventually burn up in my opinion, partially due to the lack of battery. from what i understand running an insufficient battery will actually damage the esc more than the motor. i am running the 5700 with 16/86 gearing and it will get up-wards of 180 even with a heat sink and cooling fan on the motor. it is kind of a package deal the battery, esc, motor and gearing all have to be appropriate for the application. i do not think the 6900 motor will be any better at all, someone will trade you a vxl for that 7700. that is what i would do personally