My Stampede 4x4, with datalog of the Castle 3800

[What's_nitro?]

Originally Posted by _paralyzed_

you're going down nitro?

Is that a question?

Hey it's nothing serious. I haven't recieved any packages yet.

[_paralyzed_]

Originally Posted by What's_nitro?

Is that a question?

Hey it's nothing serious. I haven't recieved any packages yet.

It has a question mark doesn't it? I was using suggestive thought. And you sir, thought about it

[pinkpanda3310]

Nitro if your going down and not expecting a package, then....

[MiRatlhed]

Nice video man. Those new Pedes rock. I was excited to see the Monster Jam Pede till I realized it was a 2WD one. What a shame....

OK, so I'll admit, I'm a little surprised. Ran the 11/54 on SPC 8000mah 2s, 20c, almost a year old, with we'll call it 40 cycles. GPSed at 34.6mph. But what surprised me is that it pulled 116.02 amps, at 6.54volts, or at 14.5c load, it was holding 3.27 volts per cell, but again, that was well into the pack . So it's basically the same amp draw. Why this surprises me is because I thought it should have pulled more amps, with the higher voltage, using the same gearing.

I was excited to see the Monster Jam Pede till I realized it was a 2WD one. What a shame....

I know, what a waste, to have a 4wd based vehicle, then use a 2wd vehicle to represent it, when there is a 4wd that would have done better.

[lincpimp]

I got my sc sytem going again, and ran it today till I thermalled it. Was doing alot of half throttle running on a very slick surface, drifting. Power is great, most likely leave it as in.

If they came out with 5mm shaft versions this 1410 and the 1415 would be great motors for all kinds of applications, escically the 4x4 sc trucks that are based off 10th stuff. I am pretty sure the 1415 motor geared right would make a stock emaxx go just fine!

[bruce750i]

Sounds fishy to me Asheck. Both testing out to be within one amp of each other. What amps is the ET rated for again? OTOH did it weight less with the 3s?

[josh9mille]

Originally Posted by asheck

This sytem has been very impressive, so far. I started with the esc down in the chassis, and it was getting much warmer.

Here a little vid, of it doing it's thing. This is basically the kind of driving I was doing for the log. http://www.youtube.com/watch?v=9hlVG9EeqbY

If you watch nothing else, the 1:00 minute mark is a must see. Truly displays this things power.

I am really curious to see how the drivetrian holds up to that power over time. If it holds up and doesnt self destruct it would be an excellent backup basher to my savage. It seems to have the same driving characteristics as my savage but in a much lighter and cheaper to operate package.

Sounds fishy to me Asheck. Both testing out to be within one amp of each other. What amps is the ET rated for again? OTOH did it weight less with the 3s?

I do only have the 100amp version, but I think it's still pretty accurate to about 125. No, the 3s weighs substantially more.

But here's another run. Geared 13/54 SPC 8000mah 2s , radared at 41mph
Full run was 5988mah, and the lvc had not cut in. Pulled 117.35 amps.
Temps were 125 esc and motor, with ambient of 64



An expanded view of the first 4 minutes.

I am really curious to see how the drivetrian holds up to that power over time. If it holds up and doesnt self destruct it would be an excellent backup basher to my savage. It seems to have the same driving characteristics as my savage but in a much lighter and cheaper to operate package.

Me to. All I can say is I've been pretty rough on it, and it's going strong. These tires make this truck. I'm so much happier then with the other tires I've tried, Talons, 30series Badlands, and Losi 320s Zombiemax tires.

[lincpimp]

Hey asheck do you have any info, pics, whatever on the mods you did to the bumpers? The front looks like a 2wd pede rpm part?

Yeah, I actually modded these for my Slash 4x4. But have always broken plastic wheelie bars, and didn't like the functionability of the Pede front, so went with these on here. The front is a Slash 4x4, that I cut off, then screwed a RPM 2wd front bumper to. I left the handle on because the bumper will bend back relatively easy, but it then hits it, and transfers all the energy nicely.


The rear is just a Slash that I cut down, and srewed back together, like this.



I did break the plastic, at one of the screws, but it still functions fine as a wheelie bar, and I haven't been taking it easy.

So, I ran 13/54 on 3s. It's really to much for the ESC. I had temps get up to around 150, with an ambient of 40, so issues were only a warm up away. But before I geared down, I tried to test the speed today, it wouldn't let me hit full throttle . http://www.youtube.com/watch?v=6pzwnOfRV5A Before sending a broken wheel flying anyway.

This motor is an absolute beast.

[BrianG]

For some reason, I just now saw this thread.

It's hard to see from the graphs posted, but it sounds to me like your 100A logger is not reading high enough to see the real story. If you look at the datasheets for the actual hall-effect devices these loggers use, you'll see they lose accuracy almost exponentially above their rating - there's just not much more headroom in those things.

I've 147A on a CRT.5 on 3s geared for ~35-40mph, so it's very possible your 4x4 is pulling more than 117A.

To see if your logger isn't enough, you can study the graph a bit more. Look at all the peak currents. First of all, the current waveforms should look almost exactly like the voltage waveforms at that point in time, just reversed (voltage dips while current peaks). If the voltage has a negative peak, but the current peak looks flat, then the logger is chopping the rest of the peak off. Also, take a look at all the places where the voltage is the lowest - the currents at those times should be higher in proportion. If not, the logger is limiting the reading. You could also take readings of the battery voltage dips at various points in the graph at (10A, 20A, and so on), calculate the battery internal resistance at those points , get a graph of battery resistance over load, and then see if the current draw matches voltage dips at suspect points.

BTW: If you want, zip up and attach the raw logger file. I can load it in the ET software and see the details and let you know what I find...

Thanks for the reply, Brian. Any input would greatly be appreciated.
Let's see if I get this right with the files.

I also included a little E-revo run that I did. It shows 120 amps, but it was only geared 24/68, 42mph, pretty conservative by my standards, yet I was shocked to see the amps of the 2 vehicles so close. The Stampede is half the weight, on half the voltage, same speed, within 3 amps of each other, I have been checking the graphs, in small increments at my highest amp points, and have always seen the max amps, and the lowest voltages at the same points. But I'm very new with this, so maybe your eye will see something my doesn't.

[lincpimp]

Originally Posted by asheck

So, I ran 13/54 on 3s. It's really to much for the ESC. I had temps get up to around 150, with an ambient of 40, so issues were only a warm up away. But before I geared down, I tried to test the speed today, it wouldn't let me hit full throttle . http://www.youtube.com/watch?v=6pzwnOfRV5A Before sending a broken wheel flying anyway.

This motor is an absolute beast.

OK, pretty sure I am running 14/58 on my 2wd pede. And I run 3s. You have a bit more reduction in your diffs vs my trans (2.72 for a pede 2wd trans vs 2.85 revo spec diff) but it is very close. I got high temos with alot of loose surface spinning but get better temps with higher traction surfaces. Must be keeping the motor loaded and in the sweet spot rpm range?

Anyways, I have a spare MM so I plan to swap it in. Pity the sidewinder sc won't do 4s as I have a very light 2wd tc that I would like to run a 1406 2y on 4s...