Quark on 6S with Mega 6 pole

[speedracer1129]

OK. I have just built an Inferno GT for a customer and I am having some huge problems!! Here is the setup:

- Quark 125
- Flight Power 6S2P 4350 EVO25
- Mega 22/30/1e 6pole
- 25/46 Gearing

First night out, 12 seconds into the run the controller blew up!!! Quark sent me another one within 4 days. Setup the new one. Now, on 4S test, it ran decent for the 5 minutes we tested it. Everything temped ok and the car did 69mph while spinning the tires the whole run. When we slapped the 6S, it thermalled almost immediately in the first pass!! It seems like there is a compatability issue with the Mega motor and the ESC.

SOOO...........

a: Anyone running this setup of motor/ESC successfully??
b: Has anyone ran a Feigao/Quark setup successfully as Quark told me to try another motor but I am afraid of blowing another controller or more......

[lincpimp]

Your gearing is most likely overdrawing the esc. The quark is a solid 5s controller, but very load sensitive on 6s. So try gearing down. It should not have any issues with the 6 pole motor, the quarks can run just about anything.

[bdebde]

6s is most likely the problem.

[starscream]

I agree with linc,
Wow, if you are doing 69mph on 4s and then add more voltage you've gotta be taxing the esc. By the sound of that, it doesn't suprise me that the Quark thermalled on 6s

[lincpimp]

Yeah, that car must be geared for about 100 on 6s. May want to drop the gearing down to about 70 mph top speed, 18t? pinion maybe?

[speedracer1129]

Well, the car was built for speed only! THis is a purpose built car for a max of 5-6 passes and then shut it down. I am going to gear it down and see what happens. Funny thing, you would think it would run cooler with the higher voltage??

[sikeston34m]

I have heard no mention of a BEC being used.

Are you using a BEC with this? Because if you're not, it's going to fry the internal bec very quickly.

The Quark 125 amp version is capable of alot. I've ran 6S on 2 of mine without any issues using multi-pole motors.

As far as heat issues go, you're alot better off to mount it to an aluminum surface, if you have one available. Coat the underside with thermal heat sink compound, then secure it with ties or something.

A fan doesn't hurt anything either, especially if you're going into that upper realm of it's ratings.

I hope this helps.

[jhautz]

Originally Posted by speedracer1129

Well, the car was built for speed only! THis is a purpose built car for a max of 5-6 passes and then shut it down. I am going to gear it down and see what happens. Funny thing, you would think it would run cooler with the higher voltage??

Not a funny thing at all that it doesnt run cooler at a higher voltage in this setup.

There is a fatal flaw in you higher voltage runs cooler logic here....

A system designed to generate the same amount of power on 6s vs 4s will run cooler on the 6s. But if you are just leaving the motor and the gearing the same and spinning the motor 50% faster on 50% more voltage, you are generating WAY more power with the 6s setup so of course its not going to run cooler.

Say you were generating 1200watts on the 4s setup, now your generating 1800 watts or more on 6s. How could that system possibly run cooler.

In order to run cooler on higher voltage you have to choose an apropriate KV motor and gearing so you are only generating the same 1200watts as you were with the 4s system.

Get it?

[What's_nitro?]

The controller is thermalling so fast mainly because of the 6-pole motor. Think about it. If 2 poles = 6 pulses per revolution, then 6 poles = 18 pulses per revolution. The ESC is working 3 times harder than usual. Add higher gearing and maximum voltage and that's pretty hard on a controller. Do you have a fan you could use on it? I think 5s with a fan would work fine.

[speedracer1129]

Sorry, Yes, I am running a CCBEC. I have heard rumors that the 6S rating is not a "comfortable" rating....which makes me wonder why they would rate it at that level?? I am running the same setup with a CC 5700 motor on 4S in a 1/10 and doing 95mph very reliably which further leads me to believe the whole 6S rating rumor!! I am going to the smallest gear I have which is a 22T as I am running the 2 Speed adaptor and using LST2 2nd gears to drive the 46T spur. If I see it gets better, than I will have to order some Mod1 pinions from Mike to continue testing. I have already blown 1 controller while running it in outrunner mode and Quark immediately sent me a replacement as they said it sounded like faulty programming. I am now running in inrunner mode and it is holding up fine, but still thermalling 10-15 seconds into the run on 6S. I will be getting my Eagletree this week so I will know for sure what is going on on the next test run!!

[speedracer1129]

Originally Posted by What's_nitro?

The controller is thermalling so fast mainly because of the 6-pole motor. Think about it. If 2 poles = 6 pulses per revolution, then 6 poles = 18 pulses per revolution. The ESC is working 3 times harder than usual. Add higher gearing and maximum voltage and that's pretty hard on a controller. Do you have a fan you could use on it? I think 5s with a fan would work fine.

I would agree with you, but I can't due to the following. Mega recommends only CC ESC's and they have no issues running a CC ESC that was designed to run a 2 pole motor?!? This leads me to believe that the Quark programming has alot to do with it. Worst case scenario, the guys at CC could maybe speed up the MMM a little( ugh, ugh) and I will go that route. We will see....

[lincpimp]

still...holding...breath...for...mamba...monster.. .maxx!

[What's_nitro?]

Could it be a timing issue? Depending upon the position of the rotor magnets relative to the stator windings, it can draw much more current when the stator is energized. I don't know which way you would try adjusting the timing to correct the problem, but it was just a thought.

[MTBikerTim]

Originally Posted by lincpimp

still...holding...breath...for...mamba...monster.. .maxx!

DON'T DO IT LINCPIMP! DON'T DO IT.

[lincpimp]

Originally Posted by MTBikerTim

DON'T DO IT LINCPIMP! DON'T DO IT.

Cough Cough. Help CC I don't think I can hold much longer!