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Old Nov 07, 2014, 03:31 AM
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Think it's trying to bind with the car when flashing
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Old Nov 15, 2014, 01:04 PM
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i have some problem, my l939 don't want to drive back - what can it be?
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Old Nov 16, 2014, 08:05 PM
XFM
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If you mean backwards, adjust the throttle trim (white wheel on the back of controller)
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Old Nov 17, 2014, 02:32 PM
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yes i mean backwards, i tried adjust the throttle trim but it's don't work
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Old Jan 22, 2015, 04:42 PM
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Hey, did any of you guys find how to take the battery out for replacement? I was thinking of buying one of these but probably won't if I can't change the battery without tearing up the car.
Also, would like to have the L929 instead but not sure I can find one of those with proportional steering.
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Old Feb 11, 2015, 07:33 AM
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Quote:
Originally Posted by Sky_Captain View Post
Hey, did any of you guys find how to take the battery out for replacement? I was thinking of buying one of these but probably won't if I can't change the battery without tearing up the car.
Also, would like to have the L929 instead but not sure I can find one of those with proportional steering.
was looking for the same thing. i wanted to put a bigger battery too (from one of mini quads) will probably buy one and try it myself.
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Old Feb 16, 2015, 01:06 AM
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Anyone come up with any mods to make it drive better? I wanted to try to put bearings in the front wheels somehow but I don't see how it would be possible. I think the front wheels are a major problem with the straight line stability, at least on mine one front wheel seems to bind a little while driving sometimes and I can watch it as the vehicle steers in that direction.

Another thing I was thinking of is to add a pot on the tx for steering rates. It seems like the other problem with control is that the steering is just to sensitive, no matter how gentle you are. This car has insane turning, it's actually too much imo.

I guess it's not really worth it to go crazy on, but it would be cool to make it handle a little better. It's still fun to play with either way. It's my sacrificial car when a kid asks me to drive one of my cars .
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Old Feb 17, 2015, 01:43 AM
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Guys, do you know if the A999 has the same problem with slowing down when turning left/right? I would like to try a999 this time, but I am affaid, there will be exactly the same problem...
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Old Feb 17, 2015, 10:33 AM
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Annandale, VA
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From this video it doesn't look like it does.
Wltoys A999 1:24 RC Car Outdoor Ride (2 min 12 sec)

I'm checking this one out, says it has proportional esc and steering but the question is, how proportional?
http://www.banggood.com/KD-Summit-S6...-p-968162.html
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Old Feb 17, 2015, 11:11 AM
Poland - Warsaw
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Poland
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Thanks. I am looking at this movie about 5 times and I am not sure. Most of turning left/right is made without full throttle...
Maybe somebody has this car? It would be great car after l939 which is not best with its slowing down...
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Old Feb 17, 2015, 12:42 PM
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Wouldn't the car flip at least 50% of the time if you were turning at full throttle?
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Old Feb 18, 2015, 03:02 AM
Poland - Warsaw
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Yes, that's why I am not sure about exactly this case with the video.
I have the L939 and the slowing down is a problem for me. OK, maybe it do not flip then, but it also is not able to dritf when you drive on slick surface...

That's why I am looging for another one mini car for my child. But this time, whithout the slowing down
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Old Mar 26, 2015, 12:18 PM
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Joined Dec 2003
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How much to freak out about sticking rear wheels

Howdy everyone! Welcome me back, after a long side trip in quadcopters I'm back in the fold of RC cars. :-)

I picked up an L939 and I really like it! But when I unboxed it, the rear wheels wouldn't turn. A little wiggling and more force than the motor could ever put on the axle and it turned.

The problem is, when I stop suddenly (even without hitting anything), sometimes the gears are binding again and the car won't roll forward, I just have ~1 turn of slop in it. Often, going back and forth (reversing and forward) like being stuck in the snow will get enough momentum to overcome the defect.

My question is: How abnormal is this? I've seen it in other, very old, abused cars. But in a brand new one? Ick.
L939 Drive Wheel Binding, "DOA"? (0 min 26 sec)


Quote:
Originally Posted by Raposo View Post
I think is a collateral effect when the steering is activated. So the battery can not supply enough charge/current at the same time for both motor and steering device. Just a guess.

In fact the drop in speed should not happen but I found acceptable.
I definitely agree with that assessment - since hanging the car in mid air, giving gas and steering input simultaneously slows the motor down. Releasing the steering brings the speed back up - this is repeatable.
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Last edited by AbeFM; Mar 26, 2015 at 12:49 PM.
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Old Mar 26, 2015, 02:25 PM
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San Diego, CA
Joined Dec 2003
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I dug into the gearbox - a couple teeth were monkied up. Also the gear that contact the axle has a LOT of slop in it. Probably this is on purpose, but it means only the edge of the gear contracts its own driving gear, and that's where it was messed up.

I shimmed it with 0.01" of teflon, greased it. It's a touch slower (probably too much/too heavy a grease) but it seems a lot smoother, and stopped hanging. Basically, "1st gear" is not always enough to get it moving - no different than it was. 2nd is good indoors, just enough to get some throttle steer on sheer surfaces.
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