Quark fried, blown capacitor...

[gixxer]

I have been running 5s since I set up the 8ight. I would say around february. as for the gearing I am running 16/46 in the buggy, I think I can gear higher but that was the biggest pinion I have. I believe the truggy also has a different gear ratio in the diffs to compensate for the larger tires.

I bought a batch too. I originally bought the wrong kind. The price was right so I went ahead and got the 200, but I really only need less than 20.

[zeropointbug]

What was the original ones you had purchased? Were they not low-esr type?

Let me know how thy work for you? :027:

The ones I got where not low esr. They were these http://www.digikey.com/scripts/DkSea...983-ND&Site=US I'll probably mount some right ones on the Quark first. I have bundled 4 together that I am going to attach soon hopefully.

I think that the older ones handle the 5S better. None of the MMs that I bought in the last few months will do 5S. The two that I bought shortly after their release are the ones that do run 5S. The funny thing is that I blew up both of those controllers running them in my Muggy. 13lbs of truck geared at 10/46 killed them both. The repair receipt that I got back from Castle said that they needed to replace FETs.

I've been running my 8ight T tonight on 5S with the 9XL geared 10/44 with 40 series Proline Moabs. With the standard MT tires and wheels, I'm at a bit of a loss for gearing. Running 4S, I was geared 16/44 with the standard tires/wheels. I would have thought that that would have been over geared, but I'm getting VERY little cogging and only occassionally. I then tried 5S at that gearing. I thought I'd need to go down on the pinion, but I wanted to try it. It ran fine. I know the 8ight is 3lbs lighter than the Muggy was, but at least some of this has to be the result of the cap bank.

i recommend Nippon Chemi-con KY series Caps.
or Nichicon PJ series Caps.

Quark original cap is KY Caps.

[zeropointbug]

The PJ series caps have an ESR value that is over 50% higher than the PL series we are using. 0.096 compared to 0.06Ohm for the PL.

These were a good deal, and readily available.

OK guys, another update. I realized something today. Some of you may have noticed my complaining about the weight of my Muggy, being 13lbs. That's one of the reasons that I got the 8ight T. Well, I'm just an idiot.

I doctored up some Dynamite 23mm LST2 hexes to fit my 8ight T and put some 40 series Moabs on the 8ight T. Get this...with the huge tires on it, 5S2P 8Ah lipo pack, and everything else, it came in at 12lbs 15oz. Go figure.

My point being this. When I was running the MM in the Muggy, at 10/46 gearing, it cogged so badly that it cooked the MM. Now that I'm running the MM with the cap bank, I'm running the Moabs (which are taller than the Mashers on the Muggy) with 12/44 gearing without a hitch. The caps are definitely having an impact on the performance of the esc.

I do have a question though, for you more knowledgeable guys. Can the addition of the caps in some way prevent the FETs from frying? How is it that the addtion of the caps is reducing the cogging so much? I know it is the caps because the esc that I'm running now is the exact same one that I fried on the MM/5S setup before.

[zeropointbug]

Indirectly I guess they can prevent them from being fried/stressed alot. The caps allow for better FET switching (from ON to OFF to ON...). I have prob said that before in this thread, but so ppl know. It also obsorbs all the noise/spikes/all the garbage stuff from the the power stage, basically cleaner power, the 'brains' of the controller maybe does not get so confused then?

I really can not tell you exactly what it can/does do inside the power circuit, cause that's all I know. Apparently it is working great! :027: :027: :eek:

zpb, I'm going to try like heck to get your caps out to you tomorrow. I don't anticipate being in court all day. I'm kind of anxious to see what your findings are relative to all of this. I know that you guys have been talking about this in techno jargon, but all of that went over my head. I'm more of a cause and effect sort of guy. I'll be interested in hearing what your observations are.

BTW, I tried 5S A123 today. I think I'm in love. When my Quark gets back, I want to try 6S A123.

[BrianG]

Originally Posted by AAngel

BTW, I tried 5S A123 today. I think I'm in love.

Just don't let your wife/gf find out!

[zeropointbug]

Originally Posted by AAngel

zpb, I'm going to try like heck to get your caps out to you tomorrow. I don't anticipate being in court all day. I'm kind of anxious to see what your findings are relative to all of this. I know that you guys have been talking about this in techno jargon, but all of that went over my head. I'm more of a cause and effect sort of guy. I'll be interested in hearing what your observations are.

BTW, I tried 5S A123 today. I think I'm in love. When my Quark gets back, I want to try 6S A123.

:027: Your my lover AAngel! Did you run 1p, or 2p? What did you run them in?

Tell me more about how you like the A123's, as I am in love with as well...


Please, I don't want to be out of your way in sending these caps, do it when you can. I don't even know if my Quark arrived at S&T yet.

I ran the A123s in a 5S1P configuration in my 8ight T. Even with the 1P configuration, the batteries only temped 130*F. I know that's hot, but it is within spec, and it tells me that running a 2P configuration is going to run MUCH cooler. These batteries can deliver punch. The 5S1P A123 pack had as much, if not more, punch than my 4S2P 8Ah lipo pack. What was also great was that I had forgotten to set the voltage cutoff. I ran the pack until is dumped, which is ver abrupt. One second I was doing wheelies and the next, the truck would hardly move. Since I was running a 2S pack and 3S pack in series and only had one charger, I had to charge them individually.

True to the claims, each pack charged in 15 minutes. I won't say that the performance is the greatest advantage of these cells, because in my setups, the lipos do fine. I think the greatest advantage is going to be in not having to worry about fires due to a crash or charging error. I have to say that I am sold on the cells.

I don't like the form that the premade packs come in, but I will be getting some loose cells.

This is what I was running them in...

Just as a point of reference, that tire on the right is one of the stock MT tires.

Brian, you're right. What she doesn't know won't hurt her, right?

[BrianG]

lol, I guess not. Hopefully she won't come here and see that you said that! :)