Mike Chino's Ridgeback

[MikeChino]

Frustrated! I got my ridgeback up and running, it has a mg90s servo, 90t Danally motor, 250ma s2 lipo. I fire it up and test, turns left turns right, pull the trigger and motor sings, but when I give it full throttle the front wheels turn left, the old servo I had in it did the same so I believe I can eliminate that, motor is new, so I'm thinking radio or speed control, anyone have any other suggestions before I tear it back apart? this thing has no room so I really didn't want to put the Sumo receiver in, I did try to bind the speed control to another Losi radio I have but it didn't work, I was holding the button on the speed control down with the radio on, I'm not sure if that is how to bind, anyway any help or ideas are appreciated.

[MikeChino]

Frustration continues, i took out the old Losi receiver/speed control and bench tested the sumo receiver/speed control, works purfect, so for kicks and giggles i hook up the old Losi reciever/speed control and it works purfect. i think im going to just use the Sumo one and put it all back together and see if its ok and save the losi one for another project down the road. only other thing i could think that was different with the bench test is that it wasent under any load spinning the tires. not sure

[89redranger]

No idea on the electrics, but nice rig! What are you using for links and ball ends. Those sure don't look like Losi.

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[MikeChino]

There Traxas ball ends with 4-40 allthread cut to length, and covered in styreen tube. it does give it a nice look but wayyyyy over kill in the Beef department, just using what i have on hand

[89redranger]

Did you drill the axles out to M3 for the Traxxas balls, or they pop onto the Losi balls? I have a TON of these rod ends in my 1.9 MRC parts. They are way overkill, but won't ever break and look good on a comper.

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[89redranger]

I wanna drill them for 1/8" carbon rod links anyway...

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[cjgotch]

Originally Posted by MikeChino

Frustrated! I got my ridgeback up and running, it has a mg90s servo, 90t Danally motor, 250ma s2 lipo. I fire it up and test, turns left turns right, pull the trigger and motor sings, but when I give it full throttle the front wheels turn left, the old servo I had in it did the same so I believe I can eliminate that, motor is new, so I'm thinking radio or speed control, anyone have any other suggestions before I tear it back apart? this thing has no room so I really didn't want to put the Sumo receiver in, I did try to bind the speed control to another Losi radio I have but it didn't work, I was holding the button on the speed control down with the radio on, I'm not sure if that is how to bind, anyway any help or ideas are appreciated.

I had the same setup almost and had the same problem, new motor changed the servo(mg90s), then the ESC and even the receiver but it kept happening. I can't tell if its the battery. I ran a 25c 2s 250 lipo but at full throttle its more like 50c according to manufacturer. Try a 15c or 20c.
FYI...I just put a stroker 180 motor in my ridgeback and the problem is gone, same ESC and servo.

[LavaCapCrawling]

I believe the twitching servo is a matter of wire routing. If the motor and battery wires are intertwined with the servo wire the voltage in the motor wires induces the servo twitch. Probably only happens at full throttle or close and only when everythings in the rig? When I decased my esc I had this problem for a while. Try to rout the high voltage wires away from the low voltage wires as much as possible. It's hard on the tight rigs and may require wire length mod.

[MikeChino]

That would explain why it didn't do it when everything was spread out on the bench, gona put the Losi one back in and re wire fingers crossed.

[MikeChino]

The bottom links are the old style Losi balls and cups, again extra left over stuff. and no i didn't drill anything. Once i get it running i will get better pics of everything.

Originally Posted by 89redranger

Did you drill the axles out to M3 for the Traxxas balls, or they pop onto the Losi balls? I have a TON of these rod ends in my 1.9 MRC parts. They are way overkill, but won't ever break and look good on a comper.

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[MikeChino]

Made sure nothing was touching, and it still does it, tried another servo, and even put the sumo one in and it did it, im going to try mounting the reciever on the front axle, i dont know. lol

[89redranger]

Low battery in tx or truck?

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[BerticusPryme]

I have had this exact problem. Its the higher wind motor and a cheap servo. Mine was an 80t and a MG90s. Same failure with a 80t big block and a MG90s. No matter how I routed the cables it did it. Bought a new MG90s and it stopped. Out of the 5 of them I had on hand it would do it on 3 of them. I swapped over to hitec servos and never had an issue after that. I figure it is the motor throwing off a field and the servo just picks up on it.

[MikeChino]

WOW you guys must be looking over my shoulder, i got the mg 90's in a 4 pack, and i tried another one and its working for now with the sumo reciever, charging the batt wile i take care of a few hunny doo's and i should b testing again in an hr, thanks for all the help guys it figures it would be something simple. see it does pay to get into the hobby late, that way most of you will have had the same thing happen, thanks again.

[MikeChino]

OK, lol i am using the Sumo radio and receiver/speed control, no glitch. so i say to myself ok lets try the Losi receiver/speed control, in foward its fine, but reverse it starts twiching, so i go back to the Sumo, all is good, set the trim and go hit the rocks, well after a min i pick it up to just check it and the trim is off, hmmmm, so i re adjust it and back to the rocks again the trim wacks out again, so i am going to head to the LHS in the morning to get a new HiTec servo. I aim dying to crawl with this thing, it needs more weight up front but it climbs like a goat.

[89redranger]

You can send the rest of those MGs my way if you want...lol. I've had nothing but good luck with them, but some do have trouble. DANALLY says something like 1/5 have problems. Still not bad if you consider the price.

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[MikeChino]

The only prob i had at the end was the trim setting, i am not sure if it wasen't the servo horn slipping, I will try a different one in the morning before i go to the LHS. And for the price i couldn't resist it was like 4 of them for $20, I will continue to use them because i have also herd good things, just trying to rule out whats up with the twitching in reverse on the Losi receiver/sc and the trim.

[BerticusPryme]

Oh yeah don't get me wrong I have run the snot out of them. In my smaller crawler built along the old thought"When in doubt; throttle out" I run a mg90. In my trekker with the 80t big block and neo mags I couldn't keep a mg90 in it. After about 4-5 runs it would just foul out like yours are.

[MikeChino]

I Really appreciate all the comments and ideas, tomorrow will tell. With everything i have into this rig another $25 isan't going to break the bank. and 89redranger if the new servo is the fix you pay the postage and i will send you 2

[89redranger]

It was just a joke buddy. I really can't believe these servos are giving you that much trouble though. I'm almost wandering if I shouldn't switch to Hitec next time I need servos. I've got an Xmods car I'm converting to 2.4ghz, which does something similar. Involuntary steering under load. I'm using a Sumo micro truggy board, an MG90s (just for mockup, a smaller 5 gram will go in the car), and the Xmods 130 motor. It's been apart for a month trying to figure it out. Now I'm wandering if that servo wasn't my problem as well...

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