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Help with wl toy a979b please, losing my mind!

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Help with wl toy a979b please, losing my mind!

Old 03-24-2020, 11:20 PM
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Default Help with wl toy a979b please, losing my mind!

Im losing my mind on this thing. I bought it about 6 months ago, took it out and loved it, but the range was horrible, like maybe 100 feet(guessing the antennae wasnt connected inside). So I knew it was a one piece esc/receiver and I figured instead of buying one and replacing it, why not upgrade it to brushless. I had an extra receiver/transmitter, so I ordered a new esc/motor combo and a new servo. I also ordered an aluminum frame since they were cheap and I figured the extra weight may give it some stability from flipping over so much. Anyway, got all the parts, put it together. Held it in my hand, steering worked great, motor worked how it should when I was holding it up. Thought it was done. took it outside to test it out, put it on the ground and it just struggled to get moving, like it was stuttering, but once it started going it took off and worked fine. Its just when it starts off it was a problem. I figured I must have gotten a bad esc or maybe motor, so I returned that set and got a different brand (60 amp 3900kv). Put it together again and it did the same thing. So then I took it apart again greased up the rear end internally, lubed and checked the bearings, everything looked fine. Still doing the same thing. If I hold it in the air, it works fine, but put it on the ground and it stutters when starting. I even changed to bearings on all the wheels to see if that would help, nope, though it seemed to tighten up the steering a lot. Anyway I just cant figure out what it is. oh ya I swapped trans/reciever out just to be sure, no help. Really hoping someone else has had this happen and can tell me what Im doing wrong, Im just lost at this point and want my dam car to work lol Thanks
Old 03-28-2020, 03:36 PM
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Sounds like cogging .
Most common cause would be too high a gear ratio . You could try a smaller pinion gear . I would drop down 3 - 4 teeth and see if it helps .
Check motor wires for damage also . Kinks or bad connections .
Old 04-13-2020, 12:05 PM
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As mentioned already, cogging seems to be what you're experiencing. Smaller pinion would help but since WLtoys uses a quite uncommon gear pitch of mod 0.7, you only have, to my knowledge, the choice of the stock 27tooth pinion or the 17tooth pinion from the a959a (which appears only available for the 380 motor shaft diameter). You're using a fairly low kv motor, so it shouldn't be expected to cog too much, and from experience even a 4300kv motor will have minimal cogging.

Make sure the motor pin connection to the ESC isn't loose. Though having the correct diameter interface, there is still some variation depending on the type of motor connector pin and this can cause a very loose fit, which will cause the cogging you described. On some connectors it is possible to slightly bend the individual "fins" outward to achieve a snug fit.

If none of this helps, you can try adjusting your ESC punch setting. A higher value may give you more available initial torque to prevent cogging.

Old 04-18-2020, 12:17 AM
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Yeah, itís just what sensorless brushless motors do when overgeared.
Those WL toy things are pretty fast, but the price You pay is gearing thatís actually a bit too high.

Sensored brushless motor and esc is the solution. Only disadvantage? Eh.. well.. the motor/esc combi needed may cost more than the whole car ever cost, especially when itís a 380/400-size motor. Oh, and a tad hard to find. 400-size sensored sets are pretty recent.

Maybe try to get the original esc/rx combi from Ali express, banggood or gearbest? I wouldnít be too surprised if the range problems are no longer apparent. ( china assembly and soldering is always a bit suspect on these toys. ) And guaranteed more affordable than awhole sensored bl-set.

Last edited by Jay-Em; 04-18-2020 at 12:20 AM.
Old 05-24-2020, 01:30 PM
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Sounds like you have your answer taken care of.

Side note, be careful with the ESC motor combo sets. I've noticed more often than not, the ESC doesn't support the maximum amperage being drawn by the motor. All over YouTube, people are using those combination sets. Some haven't had problems, but according to the math, it looks like they're barely holding on. Check the specs. ESC amperage needs to be higher to tolerate the motor amperage draw.

And don't forget about the battery. That needs to have the most tolerance for amperage. A high C rating, you can afford to have a lower Mah battery. The opposite is also true. a lower Mah battery will need a higher C rating to achieve the same amperage. Mah x 0.001 x C rating = amperage.

Last edited by funcentric; 05-24-2020 at 01:32 PM.
Old 09-16-2020, 11:19 PM
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Have you tried to search on the brand official website, I guess that there you can find some information about it

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