Horrible glitching problems! [Archive]

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Helgaiden

12-21-2007, 02:44 AM

im having a really weird glitching issue. Was happening back when my setup was Cyclone Tc2, Standard steering servo, and aitronics FM receiver that came with my MX-3 a while back (a long time ago actually). I have a carbon fiber chassis, but it never glitched at all for the longest time. I put the tc3 down for a while, then picked it back up this year and when i took it to La Mirada for OC circuit, it would glitch like crazy. I put it down again for awhile then went back to La Mirada for Toys4Tots...glitched worse. At this point, i was using a JR z590 steering servo, an XBR, and the same airtronics 75mhz FM receiver. I cleaned the receiver out, put double sided tape under everything (two layers), and put electrical tape around any touching wires in an attempt to insulate them more to keep the glitching down. Didnt help at all. Now here i am in San Antonio visiting my brother who wants me to race with him, and i got out to practice and its glitch city. I come try a different set of crystals and its no use. I try those crystals (and my original crystals) in an M11, no change. I go back to my mx-3 and try a different antenna...a tad less glitching but its still there. Now im back in my brother's street and it begins glitching when i go like... less than 30ft away but more than say...10-15ft. The throttle seems to studder heavily and after the throttle studders, sometimes the steering glitches too but the steering will never glitch if thats ALL i touch or move. Everything goes wrong once i hit the throttle (and this was with both the mx-3 and the m11). I had electrical tape across the bottom of the chassis and under the antenna and stuff to help insulate, no dice. I took it off and it seems better, oddy enough, but still bad. I switched to a different aitronics FM 75mhz receiver and try 2 sets of crystals in it both with the mx-3 and m11, still glitches (but alot less, though enough to anger me). Again, no glitching AT ALL unless i get on the throttle. This time i even put the receiver on top of the servo to keep it off the carbon fiber chassis and away from the ESC and its wires.

what the heck can this problem be? If i glitch tomorrow at the track again...im calling off racing on saturday with my bro because it would be a big waste of money. $20 and a toy donation for toys for tots and i glitched every single heat and was never able to really do my best because of it. :mad:

the really confusing part, if you backtrack a little, i went to SoCal on the friday before their last sunday race before they closed up... NO GLITCHING WHATSOEVER. But now here i am, glitchy as crazy again.

any ideas?

pics: the motor wires are long because i swap this between my buggy and my tc3. The same glitching issues were experienced with a cyclone tc2/co27 combo that had super short motor wires...and this is the setup (nearly) that didnt glitch at all at SoCal...

http://img.photobucket.com/albums/v330/Helgaiden/tc3.jpg
http://img.photobucket.com/albums/v330/Helgaiden/tc33.jpg
http://img.photobucket.com/albums/v330/Helgaiden/tc32.jpg

rccardude04

12-21-2007, 11:14 AM

This sounds an awful lot like the issue I was having with my stampede.
I was running a Futaba PCM setup with a Mamba Max brushless. You appear to have the Novak in your car, with about the most jumbled mess of wires I've ever seen in my life. I assume it's messy just because you were testing, but that's honestly probably about 90% of the problem, if not more.
Get that antenna AWAY from the esc as far as physically possible, and as close to the receiver as you can. Any wire or electronic thing near your antenna will induce a current in the antenna through a magnetic field that is created when you have a change in current in the wire. Basically, when you accelerate, your battery/motor/esc wires all cause huge amounts of interference. If you use really cheap batteries, the current draw will go down and less interference will be generated.
If possible, I would even go so far as to put the receiver in the foam bumper and run the wires through the shock tower towards esc/servo. Then with all your battery and motor wires, run them straight towards the back as best you can. Try that and see how it goes.
-Eric

rccardude04

12-21-2007, 11:16 AM

Actually, one other question...
Can you get us pictures of your current setup?
-Eric

terrible-t

12-21-2007, 11:54 AM

Helgaiden

12-26-2007, 05:14 PM

I don't see much why you have glitches. I trust the RX & M11. The only thing is location of the RX. Maybe its getting interferance from the servo. Try relocating it on your battery strap with double stick tape.

La Mirada! have been there for 7 years now. Are the races held at the High School???I heard the moved the location. SoCal I heard the lease was up 6 months back. Are they still open?? Nice to keep the home of B.Kinwald open.To bad the on-road track closed @ Revelation, last June.

the track is at the Civic center right near a fire department. Fairly near Imperial and La Mirada blvd. OC circuit comes every 2nd sunday of the month.

anyways, the pictures are my current setup. I think i may have turned my receiver around too to face the antenna toward the front shock tower though. It still glitched a little driving it in front of the house, but it worked flawlessly at the track and thats what matters to me. Also, there is a center brace under the shaft that someone pointed out to me might be the culpirit as well because the battery bars touch it. I figure the bars touching it may cause the center brace (since its woven carbon fiber) to generate some sort of electricity and cause some glitching. It only happened on throttle power and since the servo draws very little, i figure that may very well be the case. I make sure the battery doesnt touch that now. Between those two things, it seems the glitching has gone away.

InspGadgt

12-27-2007, 01:46 PM

Those power wires are what are causing your issues most likely. You want all power wires as far away from the antenna and reciever as possible. Your reciever is far enough away on the servo but the power wires are leaning right up against the antenna! Maybe you could zip tie the power wires to the rear shock tower or something along those lines. I keep my wires nice and short even on equipment I switch between cars. I just keep a seperate wire harness for each car then re-solder the appropriate wire harness for the car to the ESC.