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GT3B Hack Question and Answer Thread

Try contacting him personally. Reason they're not in stock. I believe he builds them to order.

Sent from my SAMSUNG-SGH-I537 using Tapatalk
 
I tried to send him a PM and it says he doesn't accept them so I will go ahead and wait until he responds. If not maybe I can try to contact via his website.
 
I just got a gt3c from him. Not sure exactly what he has going on but is busy with work and takes a little time to hear back but he does respond. I am very happy working with him.
 
I have finally got my moa to a testing status. I have a gt3c with the new firmware that i just purchased from overkillrc. My setup includes gt3c with a 3channel rx, hh dual mini esc, cc bec, and hh torque master motors. I have gone threw the set up a few times on the gt3c with dual esc and dig those functions seem to be working. My problem is sometimes the rear motor works some times it only works in reverse, other times it will work fwd and rev but fwd is slow and not at same speed as the front, and sometimes I can get it fairly close to working the same as the front but when i shut everything down and turn it back on I have to start all over. Also the rear motor is considerably faster in rev than the front motor is in either fwd or rev. I read some posts in this thread today that i will try when i get home from work but figured I would see if i could get anymore tips to try as well or if anyone has had this problem and what they did to resolve the issue. I am going to start by using the servo test and re calibrating the esc's and will see what happens from there. Also I have the dual rate trim switch set to control my dual rate adjustments on the fly, but is there a way to set the dual rate for example at 100% front and 80% rear but will save that setting as a starting point. I am not sure this is how i will be running but I have been messing with it and as say it seems that this setting gets re set every time I power off the tx. I could easily be doing this in the wrong setting as well.
 
It would seem to me you have esc/motor/gearing issues...

But,

How did you setup your radio? Did you calibrate the esc's? What settings are you playing with?
 
I have tried to calibrate esc's not sure if they are calibrated correctly or not but I have tried the servo test.and get the same result from servos as I do with the esc. So I connected 2 servos to channel 2 and 3 on my rx. Servo plugged into channel 2 goes forward and reverse servo on channel 3 barely moves at all forward and moves at the same rate as servo in channel 2 in reverse.to be honest I don't understand many of the new features on the gt3c or should I say what I'm doing to set them. And the instructions seen to be a bit incomplete and I don't understand then much either. But I followed a video and set up dig front and rear on channel 3 trim switch the mixing ratio on three fly to the dual rate switch and the dual rate reset on channel 3 switch.
 
J21 said:
I have tried to calibrate esc's not sure if they are calibrated correctly or not but I have tried the servo test.and get the same result from servos as I do with the esc. So I connected 2 servos to channel 2 and 3 on my rx. Servo plugged into channel 2 goes forward and reverse servo on channel 3 barely moves at all forward and moves at the same rate as servo in channel 2 in reverse.to be honest I don't understand many of the new features on the gt3c or should I say what I'm doing to set them. And the instructions seen to be a bit incomplete and I don't understand then much either. But I followed a video and set up dig front and rear on channel 3 trim switch the mixing ratio on three fly to the dual rate switch and the dual rate reset on channel 3 switch.
Click to expand...

You should not be playing with dual rates. Just because the switch is labeled dual rate doesn't mean you have to assign it to the dual rate function.

This is the official manual. It is 100% complete it's just missing all the fluffy paragraphs.

http://overkillrc.com/GT3X-Firmware/0-6-1/MANUAL-0.6.1.txt

Here is some templates, including how to assign dual esc mixing

http://overkillrc.com/GT3X-Firmware/0.6.1 Programming help cards.pdf

I would recommend resetting your model before you try the above.

Here's the instructions from the manual

Code: 
[COLOR="Magenta"]Standard menu:[/COLOR]
==============
- swapped behaviour of ENTER and END when editing items, ENTER now select
    next value and END (+ ENTER-long) will end editing items

.......

- Model number of channels and [COLOR="magenta"]Model reset[/COLOR]
    [COLOR="magenta"]> choose menu NAME and press ENTER-long
    > menu NAME will blink[/COLOR]
    > choose "C" for number of model channels or [COLOR="magenta"]"r" for model reset
	- reset will show NO/YES[/COLOR]

.......
 
Ok so i r set the tx and re calibrated the esc the system seams to be working ok for now. I am still a little lost as to how some of the dig switch functions and dual mixing functions are and i am sure I will have some more questions but i now know enough to reset and start over if things get to out of whack. Right now im just looking to get it on the rocks one dig. I have 2 questions at this time one is a problem and one is dig question.
1) Both motors turn but they seem to turn at different speeds and start turning at different times. with forward throttle the front motor will start turning before the rear and at a slightly faster pace. with reverse throttle the rear motor starts spinnig first and at a much faster rate.
2) I set the dig function to the ch3 trim and have to push the button forward to have dig push down to turn off and back to have rear dig. I would like to have it set where I hold the switch in which ever direction I would like the dig function to work forward or rear and when i release it returns to 0 or both motors.
Thanks again
 
J21 said:
Ok so i r set the tx and re calibrated the esc the system seams to be working ok for now. I am still a little lost as to how some of the dig switch functions and dual mixing functions are and i am sure I will have some more questions but i now know enough to reset and start over if things get to out of whack. Right now im just looking to get it on the rocks one dig. I have 2 questions at this time one is a problem and one is dig question.
1) Both motors turn but they seem to turn at different speeds and start turning at different times. with forward throttle the front motor will start turning before the rear and at a slightly faster pace. with reverse throttle the rear motor starts spinnig first and at a much faster rate.
2) I set the dig function to the ch3 trim and have to push the button forward to have dig push down to turn off and back to have rear dig. I would like to have it set where I hold the switch in which ever direction I would like the dig function to work forward or rear and when i release it returns to 0 or both motors.
Thanks again
Click to expand...

1.) I'd say calibration issues or the motors don't have matched timing

2.) That second link I gave you. Tells you how to do this. Read it a little closer. More specifically the last page
 
I am working on a video but having some trouble up loading right now but just wanted to update. I got most of the kinks worked out. I made one change to the dig switch and adjusted my esc's via castle link. Things worked well just needed to make some more adjustments on esc's. Turned everything off came back hours later made some changes on esc's then went to test. Now the front wheels and back wheels spun in opposite directions made some changes got them spinning in same direction but only one axle would work in forward and then only one in reverse and it was opposite axles. re calibrated esc same problems so I reset the tx and started fresh then calibrated the esc's about 4 times and have at least got both axles turning and in the same direction. But im back to them not being in sync again. Front will turn first in fwd, and the rear spins first in rev but faster. the rear will do complete rotations without the front ever turning. This occurs even when swapping channels for esc and rx. Not sure what is going on but i would lean toward the tx since both times i have reset it I get to a point where things are functioning well enough to drive.
 
J21 said:
I am working on a video but having some trouble up loading right now but just wanted to update. I got most of the kinks worked out. I made one change to the dig switch and adjusted my esc's via castle link. Things worked well just needed to make some more adjustments on esc's. Turned everything off came back hours later made some changes on esc's then went to test. Now the front wheels and back wheels spun in opposite directions made some changes got them spinning in same direction but only one axle would work in forward and then only one in reverse and it was opposite axles. re calibrated esc same problems so I reset the tx and started fresh then calibrated the esc's about 4 times and have at least got both axles turning and in the same direction. But im back to them not being in sync again. Front will turn first in fwd, and the rear spins first in rev but faster. the rear will do complete rotations without the front ever turning. This occurs even when swapping channels for esc and rx. Not sure what is going on but i would lean toward the tx since both times i have reset it I get to a point where things are functioning well enough to drive.
Click to expand...

Why are you adjusting ESC settings? They need to have Identical settings. The channels in the radio need to have Identical settings.

Stock/default settings are usually best, especially trying to get it a working from scratch. The only setting in the radio that needs to be set is the mix to be turned on, assigned to channel 3, and initialized to 0%

Also. You need to make sure your motors are timed correctly. Having one timed advance and the other retarded will cause them to run at different speeds and start at different times.

If the gear mesh is improperly set or your gearboxes are binding up differently then you'll have similar issues.

If wires are really short to one ESC and really long to the other you can these issues.

There are tons of mechanical/analog issues that can be causing this.

The radio and esc's are completely digital devices doing calculations. The only reason they would cause this is if they aren't calibrated properly or you told them to-do this via the settings.

And since the results don't change after swapping where esc's are plugged into this tells me it's not in the radio.
 
The only setting I changed in the radio was the way the dig switch was working. And when I reset the radio then it starred working correctly again just the motors slightly off in start up and speed. The Holmes esc have adjustments to make to drag brake the Holmes hold and other options. I was setting the Holmes hold and drag brake so they were not as strong. I did each esc identical. The motors are timed identically. I don't know which end of the spectrum lies I'm just trying to figure it out. In one forum people say radio in the other it's the motors or esc. I'm just trying to figure it out not saying it's one or the other. The only thing I find odd is that when I reset the radio things started to work in a more normal fashion. And the only thing I had changed from the last time was the way the dig switch operated.
 
J21 said:
The only setting I changed in the radio was the way the dig switch was working. And when I reset the radio then it starred working correctly again just the motors slightly off in start up and speed. The Holmes esc have adjustments to make to drag brake the Holmes hold and other options. I was setting the Holmes hold and drag brake so they were not as strong. I did each esc identical. The motors are timed identically. I don't know which end of the spectrum lies I'm just trying to figure it out. In one forum people say radio in the other it's the motors or esc. I'm just trying to figure it out not saying it's one or the other. The only thing I find odd is that when I reset the radio things started to work in a more normal fashion. And the only thing I had changed from the last time was the way the dig switch operated.
Click to expand...



If it's getting better when you reset the tx. It's because you are adjusting the wrong settings..

You have setting or calibration issues. This is exactly what you should do.

1.) Radio Calibration Procedure
http://www.rccrawler.com/forum/elec...ck-question-answer-thread-15.html#post3213031

2.) How to turn on DIG Mix
-Reset settings
*Scroll to NAME, press and hold enter
*Scroll to r, press enter
*Scroll to YES, press enter
*Get back to main menu somehow, I don't quite recall what happens after you press yes. But pressing back/end afew times should get you back to the main screen

-Turn on mix
*Scroll to E.Point, Press and hold enter
*Scroll to d, press enter
*Scroll to 3, press enter
*Scroll to 0%, press enter
*Press and hold enter, press back/end afew times

3.) ESC Calibration Procedure (This should be done after radio calibration, and both esc's should be calibrated at the same time with even mix percentage (0%))
http://holmeshobbies.com/downloads/documentation/torquemaster-br-instructions.pdf

^^^ You should also reset ESC to factory default settings before calibrating, worry about drag brake and whatever else after you get a working mix ***


If that doesn't work then you have mechanical issues that you are trying to band aid with digital settings. (I'm including motor timing into this)
 
Last edited:
Overkillrc will be shut down for the next 2 weeks starting tomorrow (friday) morning. The website won't be taking orders and I won't respond or probably even look at any emails.

All current orders will be shipped out tomorrow morning on my way out of town.
 
I just aqired a new GT3C rx with 6 channel tx's. I've noticed the webstore is closed. Will you be reopening soon??.

I'm in need of help with the most current and up todate info. Programming features and options. Also curious on how to water proof the recievers.

Thanks.
 
stelerzman said:
I just aqired a new GT3C rx with 6 channel tx's. I've noticed the webstore is closed. Will you be reopening soon??.

I'm in need of help with the most current and up todate info. Programming features and options. Also curious on how to water proof the recievers.

Thanks.
Click to expand...
Your answer is three posts above>
 
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