Quark 125b post thermal behavior

[natrix]

I'm still trying out gearing on my BPP LSP. With the Neu 1515 1y, 16/51 gearing and 4s2p 8000mah maxxamps packs...she thermals after about 1 minute of running. If I let her cool for about 1 minute...and then turn the epa down to 60% I can run her for another 5-6 minutes continuous, but she will often cut out. If I tap the brakes after she has stopped, she can go forward again. Is this normal behavior once the quark has thermaled?

Well, when i had my brushless lsp, i ran a 9xl with 16 cells on the Quark 125 geared 15/51 and NEVER EVER thermaled the controler. This is running for about an hour, under race conditions, in 85F+ weather too.....

Also, try and reprogram your controler.

Come to think of it, i have never had the Quark over 140F.............



Hope this helps.......

Bye :018:

*EDIT* BTW i am running heat sinks on my Quark..............

[smhertzog]

Originally Posted by cemetery gates

Well, when i had my brushless lsp, i ran a 9xl with 16 cells on the Quark 125 geared 15/51 and NEVER EVER thermaled the controler. This is running for about an hour, under race conditions, in 85F+ weather too.....

Also, try and reprogram your controler.

Come to think of it, i have never had the Quark over 140F.............



Hope this helps.......

Bye :018:

You're a very lucky man I and others on this board have not had quite as good of luck. Check this out:
http://www.rc-monster.com/forum/showthread.php?t=3405

http://www.rc-monster.com/forum/showthread.php?t=3861


natrix you're not the only one, but a a heat sink, case modifacations, and or fans will all help. I,ve been running my Quark with the modified (removed) case that you'll see in the second thread I listed above. I have tried to overheat it by overgeraring it and running lipo pack after lipo pack with no cool downs and heated up my 7xl but the quark has never thermaled. Mike also sells a heatsink in the brushless section of the shop.

You might be overgeared if you are thermaling that quickly. I would try some smaller pinions first. Even if you put heatsinks and fans I think you will still overheat with that kind of gearing. In my hyper 7 I run 12/51 on 4s and it is perfect. So you might want to start with lower gears and go up from there if there is no problems.

[natrix]

I kinda knew I was overgeared but I wanted to try and push it as far as possible with gearing. I'm going down to 13T on the pinion to see if I still get the cutting out/reverse to re-enable effect.

[coolhandcountry]

well for one the 1515 1y is a lot hotter motor than a 9xl. To get the same temps would need to gear lower than 9xl.

[glassdoctor]

16/51 with a 2200kv is overgeared for all but speed runs imo.

I don't gear that tall even with my 1700kv 1515.... I think I would be running about a 12T pinion with your setup.

Still... maybe you have an esc issue, like the fets not getting good contact with the case.

[neweuser]

I have this same problem. I'm going down to 4s instead of 5s. and changing from the 10xl, 9xl to the neu 1515 1/y. I was hoping this would change things. From this thread, it does not sound like it. ARGGGGGGG
What is up with these Quarks? I'll say it's the last one I buy!

And I don't think 16/51 is over geared for an emaxx at all. 18/51 or 20/51 maybe, but not 16T.

[neweuser]

Originally Posted by coolhandcountry

well for one the 1515 1y is a lot hotter motor than a 9xl. To get the same temps would need to gear lower than 9xl.

what pinion would you suggest Leroy? The Neu should be a cooler motor than the 9xl do to it's efficiency?

[natrix]

My wattmeter showed a 100 watt difference between the neu 1y and the feigao 7XL at WOT. Both motors never got very hot with 16/51 gearing. I'll post some numbers when I run my new setup tonight. I'm going to try 14, then 13T pinion. I epoxied new heatsinks to the quark and twin novak 25mm fans to cool them off.

[glassdoctor]

Is this a truggy correct? That's what I was basing the gearing for...

[natrix]

After a quick run today, I saw a spark coming off the ESC wires on the quark. Very shortly after, the ESC stopped working. I let it cool down but now it has a really bad hesistation from a standstill, and it smells like something has been burnt near the wires. I think I may have toasted my quark. @#$%!

[nbcaznmaster]

BURNT TO A CRSIP! Bad luck man. Loosing a esc is like losing a part of your heart. You'll probbably lose a kidney too, cuz u'll need to sell them to buy another esc!

[natrix]

I have to wonder why this happened. What caused the spark? If I plug her in she runs intermittently and only at a slow speed. The wires leading to the motor also start to warm up. Is this something I can fix on my own or should I send her in?

Perfect timing too, the last race of the season is this Saturday.

[natrix]

I tried reprogramming the quark in case it was a programming issue. It is still cogging ocassionaly but still works. Wierd. After this weekend I am sending it in to see if their techs can get rid of the cogging.