Quark on 6S with Mega 6 pole

[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.

[lincpimp]

Yep, I forgot to ask about the bec, use a ccbec if you can.

A fan and good heatsinking is a must, but it is good to test on lower gearing and them gear up until the equipment starts to overheat.

[sikeston34m]

The Quark line of ESC's are not over rated. They will deliver the amperage they advertise.

The catch is the liniar Battery Eliminater Circuit they have built in, isn't capable of carrying the Receiver/Servo's when powered by more than 4S.

The internal BEC just creates soooooooo much heat. Even on 4S, by adding a Castle Creations BEC circuit, ESC temps will be reduced alot.

In other words, if you're NOT using an External BEC, the majority of the heat that you are seeing isn't necessarily coming from the Power FET's inside the speed controller. Most of the heat is coming from the internal BEC that just can't keep up.

The Castle Creations BEC is soo nice also. It gives you the option to adjust the amount of voltage supplied to the Receiver/Servos. I have mine set to 6.0 volts. This makes the Servo's stronger and faster than powering them by an ESC (5.0 volts).

Look in your Quark manual under "Opto-mod" for more information on using an external BEC.

[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?

[speedracer1129]

Originally Posted by jhautz

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?

I understand what you are saying. However, I design the system based on the RPM I want out of the system. That is why I am saying I am suprised of the heat issue. Pulling 60k out of a 2S and pulling 60k out of a 6S is a world of a difference in heat!! I agree with linc on the gearing issue. I am going to change it and see now that I FINALLY got my V3 in I will keep you guys posted.