Which brushless system is best for the MTDT?

[XPLORx4]

From what I've read so far, it looks like the VXL runs OK, but the ESC is too big to mount in the tub and lacks top end with the stock gearing, the Tekin 8.5T runs too hot with the stock rotor, and the Sidewinder/5700kv is too fast.

So, what's a good motor/ESC combo to replace the stock electronics? I was thinking maybe a Mamba Max Pro with a Velineon 3500, using a 15T pinion and 3S 4000mah Lipo.

If it's too fast, I can dial down the Throttle EPA.

Thoughts?

[wolf16731]

I know that my Tekin RS has a small footprint. It will also run any motor, sensored or sensorless, all the way down to around 4.5T. I don't remember the lowest motor you can run, but as you said, the 8.5T runs too hot so that number shouldn't be an issue. I would imagine the Velineon would run fine, as would the Castle 4600kV or maybe for sensored I think a 10.5T would be about right, if not 13.5T.

Besides, the Turbo feature is too fun not to have on a basher. My Blitz runs like a bat out of hell with that RS w/13.5T and the turbo turned on.

[badger]

Originally Posted by XPLORx4

From what I've read so far, it looks like the VXL runs OK, but the ESC is too big to mount in the tub and lacks top end with the stock gearing, the Tekin 8.5T runs too hot with the stock rotor, and the Sidewinder/5700kv is too fast.

The VXL runs great IMO, yes it doesn't not have a ton of top end with the stock gearing (neither did the Tekin 8.5) but because really is a 550 you can geared up without increasing the temps to much.

I'm guessing that Mamba 5700 was getting hot, yeah it's a fast motor but with all the ones I had (including the 4600) they always ran hotter then any other setup I've used.

Originally Posted by XPLORx4

So, what's a good motor/ESC combo to replace the stock electronics? I was thinking maybe a Mamba Max Pro with a Velineon 3500, using a 15T pinion and 3S 4000mah Lipo.

The Mamba Max Pro won't fit behind the motor where the stock ESC is.

The stock ESC location dimensions in the chassis (behind the motor) are:

L 43.29mm / 1.70" (that's with a 12.80mm / 0.5040" space between the ESC and Traxxas VXL motor endbell (without the plastic protector cap)

W 35.80mm / 1.40"

L 56.09mm / 2.20" (From end of chassis to the VXL motor endbell)

The Mamba Max Pro dimension are:

L: 1.79” (45.5mm)
W: 1.44”(36.5mm) Slightly to wide.

Originally Posted by XPLORx4

If it's too fast, I can dial down the Throttle EPA.

Thoughts?

From my understanding (and experience) brushless systems do not like to run at half throttle or with end points turned down from full unless the ESC has a mode or a way to program it into the ESC. It seems to overheat the brushless system if I ran at half throttle for extended periods of time or lowered the EPA down to let a not so experienced driver get the hang of driving my R/C.

[Nitrox]

Originally Posted by badger

From my understanding (and experience) brushless systems do not like to run at half throttle or with end points turned down from full unless the ESC has a mode or a way to program it into the ESC

The new ESC firmware (v1.28) from Castle allows you to adjust that.

[specgie]

I run a ballistic 10.5 motor (19t pinion) & LRP Sphere competition esc in my MTDT. LRP esc's have small footprints & fit perfect in the stock location behind the motor. I like the speed & power of the 10.5 but for some jumps & runs I could use a little more. The 8.5 seems like a perfect motor for this car, granted one can handle the squirelliness of the power.

[STANG KILLA SS]

whats the KV of the 10.5?

ive got a EZ run 4000kv i was gonna try with a sidewinder or BR-XL on 3S

[badger]

Originally Posted by STANG KILLA SS

whats the KV of the 10.5?

The Novak Ballistic 10.5 is 4200kv

[Duster666]

So I guess this thing has the Hardened Gears in the diffs? Not the pot metal ones....

[slackerman]

I had my 5700 sidewinder in until my esc went up in flames yesterday, so i got my Tekin RS 13.5 and i love it soooo much more, a ton more controllable.

Did a few mods for some more suspension travel today. ill post pics tomorrow.

[blitzracer]

I'm running a sidewinder 4600 in mine and everything fits in the stock location and I like it so far. Top end with stock gear is prolly close to 30 mph and it launches like a bat out of hell with 4 wheel drift on asphalt. After about 15 mins of pretty hard running the motor temp was around 180 but this motor has got pretty hot in everything it's been in so far and it needs some new bearings I'm sure so I cant complain. For the price I would definitely recommend it. I am runnin a 5000 2s btw

[Duster666]

So no one has had a problem with the stock diff gears with the brushless system??? Because in the Manual in has the Hardned gears as an option so I wonder what the stock ones are made of....

[blitzracer]

No problem yet and iv been abusing the drivetrain alot tryin to keep the nose up on jumps and hard landings on throttle

[Duster666]

Strange cause when people were putting brushless in the wheely/crawler kings they were melting the diff gears. Maybe the hardend ones are already in there. I guess we will find out when a diff gets opened. Awesome

[WilliamG]

Originally Posted by Duster666

Strange cause when people were putting brushless in the wheely/crawler kings they were melting the diff gears. Maybe the hardend ones are already in there. I guess we will find out when a diff gets opened. Awesome

The WK also has a much taller tire that also probably outweighs the mini's tires 3x over.

[Duster666]

Alright guys just tore down the rear diff. The Gears are definetly Steel not Pot Metal so I guess they are a step down from the optional Hardend gears available. Phone is dead so no pics. But certainly good for the brushless crowd.

[WilliamG]

Originally Posted by Duster666

Alright guys just tore down the rear diff. The Gears are definetly Steel not Pot Metal so I guess they are a step down from the optional Hardend gears available. Phone is dead so no pics. But certainly good for the brushless crowd.

Then HPI probably used the E-savage gears in it. That's a good thing if they did.

[DarthRacer]

So I put a VXL motor and Sidewinder ESC in mine. The ESC fit great in the stock location. I also removed the plastic guard on the end of the motor like Badger did I believe.
Has anyone changed the gearing from stock yet that put a BL system in? My VXL and battery got pretty warn tonight, but it may have been from running in the grass. I want to see what you guys have done before I go tearing into it again to change pinions.

[WilliamG]

Originally Posted by DarthRacer

My VXL and battery got pretty warn tonight, but it may have been from running in the grass. I want to see what you guys have done before I go tearing into it again to change pinions.

nimh or lipo?

nimh will get warm because of amps drawn, if you can barely touch it for 5 seconds it's probably best to go down 1 pinion tooth. If you can't at all better drop 2 or 3. If you can hold it your fine.

lipo should be cool not even warm or something is wrong

.

[DarthRacer]

Originally Posted by WilliamG

nimh or lipo?

nimh will get warm because of amps drawn, if you can barely touch it for 5 seconds it's probably best to go down 1 pinion tooth. If you can't at all better drop 2 or 3. If you can hold it your fine.

lipo should be cool not even warm or something is wrong

.

Lipo battery. It got warm so I knew it was because of a) gearing b) running in grass or c) both.

[badger]

Originally Posted by DarthRacer

Lipo battery. It got warm so I knew it was because of a) gearing b) running in grass or c) both.

It got "extra" warm because of running in grass, that will add extra heat to any system. I haven't tried gearing mine up at all but I am planning on changing the stock 18t pinion to a 20t to see how that feels. The VXL system has so much lo end torque and power I don't think it will have any issues.