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-   -   Official Tekin RX8 GEN2 ESC Thread (https://www.rctech.net/forum/radio-electronics/726576-official-tekin-rx8-gen2-esc-thread.html)

natious 04-12-2014 08:00 PM


Originally Posted by Randy_Pike (Post 13179595)
On a Futaba make sure your throttle channel is reversed, epa's set to 100/100. Then radio calibrate.

If you still have an issue there. Make sure your NW is set to at least 10.

Still no luck, seems the problem is happening when I brake hard, I think it might be a transmitter problem as the little bar on the screen jumps instead of moving smoothly when I apply brakes :/

Neutral With is set to default 25

Thanks

ta_man 04-12-2014 08:11 PM


Originally Posted by imrob (Post 13178840)
hey that looks like a good job. what heat setting did you use i used 650 for mine. but i had to send it back in for some reason. i hear some guy going to 750 what is to much heat for the esc. I just want to makes sure my second one dont go to crap when i get it back.

I use a 45 watt Weller 4033S heater (really big chisel tip) that fits in a screw in handle. The rated tip temperature is 1100F (yes, over 1000). It is not temperature regulated. I pre-tin the wires, then squeeze them in a vise until they just fit in the slots. Put some flux in the slot, put the wire in the slot, flux on top of the wire, a little solder on the iron, and I can solder a post in a second or two.

High temps like this are too much for the ESC only if you hold the iron on the post for too long. I know 1100F sounds like overkill, but the hotter the tip, the faster the heat gets into the joint and the less time the heat has to get down the post to the electronics. If done correctly, it ends up being less stress on the rest of the electronics. It is essential to use flux with this technique because that gives the instant heat transfer that lets this work. I've been soldering stuff for about 50 years and this works for me.

Pic, for reference: http://s92437987.onlinehome.us/ebayp...ight-3-rx8.jpg

iamahuman 04-12-2014 08:14 PM


Originally Posted by Randy_Pike (Post 13178829)
IT's not bad. But if you do the "Squeeze" trick in my video, that wire would be all the way down into the slot. :)

I'll get an iron rated for 80W, 920F. That should do the job quickly.

EDIT: @ta_man: Do you have to clean the flux off or can you leave it as is?

kahuna2793 04-12-2014 11:14 PM

Randy pike you have pm

Randy_Pike 04-13-2014 11:12 AM


Originally Posted by natious (Post 13179752)
Still no luck, seems the problem is happening when I brake hard, I think it might be a transmitter problem as the little bar on the screen jumps instead of moving smoothly when I apply brakes :/

Neutral With is set to default 25

Thanks

That would make sense....If you see the transmitter screen showing erratic behavior that's the sign of a bad "pot" on that channel. Time to send it in :(

natious 04-13-2014 02:24 PM


Originally Posted by Randy_Pike (Post 13180870)
That would make sense....If you see the transmitter screen showing erratic behavior that's the sign of a bad "pot" on that channel. Time to send it in :(

Damn, hope not, it's brand new. I will take a video of the problem and post it up.

Edit: here is the link youtube.com/watch?v=HB9mPMdFiXo

When I reverse the channel it happens on the opposite side, so I don't think it's a pot problem?

Mind_Blower 04-13-2014 07:25 PM


Originally Posted by natious (Post 13181240)
Damn, hope not, it's brand new. I will take a video of the problem and post it up.

Edit: here is the link youtube.com/watch?v=HB9mPMdFiXo

When I reverse the channel it happens on the opposite side, so I don't think it's a pot problem?

Turn off the ABS (anti-lock brakes).

natious 04-13-2014 08:35 PM


Originally Posted by Mind_Blower (Post 13181963)
Turn off the ABS (anti-lock brakes).

Ok thanks, I'll give that a try and see how it goes, do you think that could be effecting it all?

Randy_Pike 04-13-2014 08:50 PM

Your throttle channel should be reversed PRIOR to the radio calibration, not after.

Yes ABS can affect radio calibration in some cases.

natious 04-13-2014 10:11 PM


Originally Posted by Randy_Pike (Post 13182178)
Your throttle channel should be reversed PRIOR to the radio calibration, not after.

Yes ABS can affect radio calibration in some cases.

Ok thanks I will disable abs and recalibrate when I get home.

Matt1970 04-14-2014 06:45 AM


Originally Posted by Matt1970 (Post 13179681)
I'm running a RX8 Gen2 whith a 4300hd in a pro 4 short course. I ran about 3 laps today and it stopped but steering still works. When I squeeze throttle it just barely bumps forward and quits. Lights 5,6, and 7 flash. If I try reverse, lights 1,2,3 flash. Manual talks about high and low neutrals when this are flashing. I have everything set back to zero and have tried recalibrating radio and also rebinding radio to receiver. It also takes a long time to find neutral, forward, and everse when calibrating.


Anybody??? :confused:

fq06 04-14-2014 06:50 AM

What is your neutral set at in the ESC? What radio are you using?

Mizchief 04-14-2014 07:21 AM


Originally Posted by iamahuman (Post 13178040)
I tried soldering up my rx8 again and here's one joint. Could you guys take a look at it and let me know?

I can't get the wire flat enough to go into the posts despite using a pair of pliers and a lot of force.

The strength is good but the colour worries me. The solder I'm using always cools off to give that colour though. If this isn't good enough, I might use a bigger iron. This was done with a 40w iron.

Yea that's looking pretty rough bro. Cold solder joints are no joke, if a battery lead comes loose and touches one of the other posts, your going to lose the ESC at a minimum, if the fire gets to your battery, you'll lose the whole car.

It took me awhile but got halfway decent using the Weller station and stock tip, but picked up one of these:

http://www.amazon.com/gp/product/B00...?ie=UTF8&psc=1

And their 5.5mm flat tip and it made wiring up my latest ESC a breeze. Default setting is 750f and I found it worked pretty well. Hot enough to get the job done quickly and didn't need any flux to get things started just a dab of solder on the tip.

mconway 04-14-2014 07:44 AM

Current Limit and heat
 
There has been a healthy debate recently at our local track. When setting the current limit on an RX8 Gen2 to say 70% does that increase of decrease heat in the ESC? There are two camps one saying it would increase heat in the esc as it is needing to act as a current block others feel it should be cooler as its not allowing the motor to draw more current. This would be in an SCT or 1/8 buggy application.

Mizchief 04-14-2014 07:52 AM

I would think it would reduce heat, but depends on how the feature is actually implemented. I figured it would reduce throttle input when the current limit is reached, which would mean lower temps as the higher current never comes across the esc.


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