New ET48 build, basher, long can motor

[Slevin]

All are good ideas. I personally went with the m2c game changer chassis because I think it is worth it. Someone else may not think so.

 

[smirkracing]

All are good ideas. I personally went with the m2c game changer chassis because I think it is worth it. Someone else may not think so.

Do you happen to know what it weighs relative to stock?

 

[Overkill]

 

[smirkracing]

Definitely heavier but how much difference does say 5% make (I am counting 4kg as the base weight).

The huge tires I am running are at least 500 grams heavier than normal truggy tires and that is not only mass, but rotating mass.

I don’t disagree that more weight is definitely more stress on the entire vehicle, just wondering if 200 grams is a lot. The motor I am running is about 100 grams more than a typical motor.

 

[Overkill]

Even if you don't use all the other features of the chassis, the reduced chassis flex is very much worth it. The M2C wide chassis can handle anything without bending.

 

[smirkracing]

Update for folks who are evaluating motor choices for their own builds.

For my build, I knew I would run 6s, and I relied on forum recommendations to select tires (Arrma Backflips).

I selected a TPPower 4050 motor, aiming for a "middle of the road" result, which is to say, not quite at the overkill level, but way more power than a racer would run. The most important thing to me was the ability to run two battery packs, back-to-back (spoiler alert: I failed).
You can read the motor specs on the website, but the important ones are:
--40x80mm (roughly)
--420 grams in weight
--5000 watt peak, 2350 watt continuous
--1700kv

I went with 1700kv because that number was roughly in the middle of the KV range for motors that were listed as being capable of handling 6s:

(TPPower website motor selection table)

So here's the part I got wrong: the ET48 being my first Tekno, I hadn't realized the 15t was about the smallest pinion that would fit without some amount of surgery (i.e. grinding the motor mount, or other modifications). Combining a 15t pinion with the Backflips (which are 6.8in in diameter) produces a relatively high final gear ratio.

So, although the performance I get is absolutely phenomenal, the motor temps are too high (around 190-200 degrees), and I definitely can't run two full packs back-to-back.

So far all my testing has been at 50-60 degrees ambient, so this problem will be worse by about 30 degrees in the summer.

Now, if I step down to a 6" diameter tire, or even 5.5" like a standard truggy tire, then I don't break 140 degrees on the motor.

I am currently using passive cooling only (i.e. a motor heatsink) because I know I can always get a final improvement in temps by adding fans, but I like to save that for last.

For those of you getting motors for your builds, you might want to think about which tires you will run, and if they're over 6" in diameter, you might need to lower your KVs to make up for that (because you can't correct the gear ratio with the pinion, below 15t). I think a 12-13t pinion would be ideal for this 1700k motor with the big 6.8in tires.

If you were running a longer can more (85, 88mm) you might be ok, though. That's probably my next motor, but I might still aim low on the KV because there is plenty of room to increase the size of the pinion gear, just not much room to decrease it.

Happy over-powering!

 

[Timzzer]

I have a 2050kv on 6S and Trencher 40 series on my mt410. I grinded the motor mount to fit the 12T pinion. After a 4000mah 6S pack today, the motor was 56°C (with an outside temp of 18°C) and that's without a fan. I might need one for the summer tho. So i recommend you to grind the motor mount. You'll still get 60mph but with more run time and less heat.

 

[smirkracing]

Can you show me where you ground your motor mount? I actually tried removing some material but must have done so in the wrong place, because the motor mount didn't move in any further.

 

[DSMMOTORSPORTS]

Here is my set up now thanks to @Overkill ideas this one step further than his now its a 6s 1550kv w/18T it runs 57mph. Arrma dboots backflip lp tires
I went all-out it weights in at 15lb full dress

 

[Mt410dude]

Hey smirk I now it's been a while , but where is your motor timing at . Delta winds like low motor timing on the esc 0 degrees for the tp motors works best .