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SkyRC 8.5T motor in 1/10 buggy - goes slow after short run on full throttle

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  • 1 Post By craigparris1

SkyRC 8.5T motor in 1/10 buggy - goes slow after short run on full throttle

Old 03-28-2019, 04:17 AM
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Default SkyRC 8.5T motor in 1/10 buggy - goes slow after short run on full throttle

Hi guys,


After reading various reviews, and seeing plenty of posts with people putting the same motor in similar cars, I recently bought the SkyRC Cheetah 8.5T / 60A ESC combo to install in my HSP 1/10 buggy. It runs fine (actually, it's super-quick compared to the stock 540 motor that came with the buggy) - however, if I run it at full throttle for maybe only a couple of minutes, the motor suddenly just slows right down and won't go any quicker. After a short rest it will run again, and in fact if I only get the throttle to about 3/4 it will run fine for 10-15 minutes (and it still zips pretty quick). But give it a burst at full throttle again, after only a minute or so, it will slow right down to a crawl.


There was no specific manual provided for the motor (and I can't find one), but the ESC light (which begins blinking red) goes to solid red and in the ESC manual that states that "motor turbo timing" is on. I'll admit that I don't really understand what that means, and stuff that I read about timing doesn't really make all that much sense to me ....


So, a couple of questions:

- is the motor speed being automatically reduced because it's running to quick for too long?

- have I bought a motor that's got too much grunt for the buggy that I have?

- is there anything that I should change in relation to the "timing"? (I'm guessing not, but not sure)

- or do I perhaps need to alter the current gearing to reduce the overall top speed (and therefor the motor won't think it's running too fast)?


Or, do I just not know what I'm talking about and there's something completely different going on?


Any information or advice would be greatly appreciated. Ultimately I just want to get everything tuned up just right, and I know that with some regular maintenance on the brushless motor I should be able to get a reasonable life out of it.


Thanks,

Craig
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Old 03-29-2019, 06:38 AM
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I have never had much luck with SkyRC ESC's I went through 6 of them in a very short period of time and lost confidence in the brand.

Anyway... are you using a NiMH pack? If so, then you might need to disable the LVC which is designed for LiPo's... if you don't have a programming card then it will be extremely difficult, but possible to do with button press sequencing and listening to tones... you will need to RTFM very closely.... good luck!
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Old 03-30-2019, 02:26 AM
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Hi Bill,
Thanks mate - yeah, it appears that turning off the LVC setting did the trick. A programming card came with the bundle, so that made it easy.

The motor is super quick (maybe too quick - a bit scary when it's flying at full throttle!). Had one bad stack and broke a couple of small parts ..... but hey, what else am I going to spend money on?
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Old 03-30-2019, 07:50 AM
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Something to watch out for (at least this is problem that repeated for me) is that if you take a hard hit or land with a chassis slap, the ESC can start to do strange things like momentarily go full throttle with complete loss of steering. I race at a club, and it wasn't that big of a deal to me until car "ran away" from me right into a turn marshal and left a huge bruise on his shin that lasted 8+ weeks... I still feel bad about that incident and have stopped running SkyRC ESC's since.

When your ESC fails, I would encourage you to consider HobbyWing, I have switched to that brand for all 5 classes that I currently race and they have been extremely reliable over the years
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