Hello,

I am driving my new buggy in the parking lot to break in the engine but after 4 tanks of fuel the buggy is like is not responding. Basically when I turn the buggy left and the car slides it tries to turn right on its own or goes a bit crazy.

I hold it in the air and I press full throttle and I see the front wheels turning left right very fast. I charged the receiver battery for a couple of hours but the same happened. My transmitter is a Futaba 3VCS 2.4 Ghz and I synched the transmitter with the receiver a couple of times to make sure it wasn't the problem.

Any clue?

do you have a fail safe fitted if not you have to charge the rx battery at least 8 hrs ie over night to get a full charge into it

Hi

I dont have a fail safe. How much does it cost and what is it exactly :D

8 hours whatever the charger whatever the receiver battery?

the fail safe works like this if you get interference it shuts the throttle down and goes into brake mode and also if your batteries are low it does the same if the charger you have plugs into the wall then more than likely it a slow charger then yes best to get a full charge will be 8hrs for any type of battery

fail safe are about £9.99 upwards

Seriously worth £10 for a fail safe. Charge all batteries absoultely full before you can go ahead trying to change parts, complete the obvious first.

http://cgi.ebay.co.uk/Nitro-RC-Fail-Safe-C...=item3efc1ee2c8

http://cgi.ebay.co.uk/MICRO-WATERPROOF-INT...=item439efc5945

http://cgi.ebay.co.uk/Fastrax-Micro-Failsa...=item4a9e3d06b2

:thumbs_up:

Hi again,

my transmitter is a Futaba 3VCS 2.4 Ghz which has a fail safe installed on it I believe.

However I have charged up the battery for 8 hours, checked its voltage with a battery checker and it is full but still the car at some point went crazy. I am quite sure that when the engine is off the response of the car is ok. But when the engine is on and I press full throttle or break then it somehow looses it.

The antenna of my receiver is not fitted in the antenna tube and I am still running the car without a body shell. Is it possible that this is causing the problem?

Thanks

you need the aerial to point upwards to gain range if it laying down it wont help it very well

The interference was due to loose exhaust system. When I tightened it to the chasis the problem stopped. Now the other problem is when I brake the car suddenly throttles for a split second. Is this some kind of setting on the Futaba 3VCS?

Hello again,

its been a month now and I have tried everything mentioned in this thread and many more. I have send the receiver to Futaba and they state that nothing is wrong with it. The only thing tha they suspect is that my servos could be drawing to much current and thus causing a problem. Has anyone heard of such a thing?

Thanks

What size receiver pack are you using? 4.8v or 6v ?

6v

Please people I really need your help here!

I have sent the Futaba receiver to Futaba service center and they say there is no problem with it. They said it might be the Savox servos drawing to much current which the receiver can't handle. I took the eceiver to an electrician and he reenforced the wiring to be able to draw more current. I also checked the receiver battery with a battery checker after I charged it and it is Fully Charged!

The problem occurs when the engine is ON and not when it is OFF.


Any ideas are welcome since its been now 6 months and I haven't figured out the problem! PLEASE ;)

This is a tough one..... andvery difficult to solve for us unless we are standing in front of it. Savox servo's have caused this issue with my Spektrum receivers, be cause they draw so much power. I added a receiver capacitor pack and had no more issues.

http://www.spektrumrc.com/Products/Default...?ProdID=SPM1600

Alternatively, get rid of the futaba and switch to 2.4ghz!! :thumbs_up:

Thanks for the reply. The futaba I haave is a 2.4 ghz

Sorry, I was having a blonde moment :P

It has to be a drop in power then, which means you need the power cap. :thumbs_up:

I've heard very little about issues with 2.4ghz suffering 'interference' issues. ;)

Is there a receiver cap suitable for my Futaba?

They are pretty standard, but I would ask the question of Futaba themselves, just to make sure. :thumbs_up:

Never used a power cap on my Futaba 2.4 ghz 3Pk.
I also used Savox servo's.
20kg on steering & 12kg on throttle/brake.
Sounds like your end points are set incorrectly.
This means your servo's are straining against the steering stops or full throttle/on the brakes.
Hope this helps?

thanks for the reply

wouldnt the problem be hapening though with the engine off if this was the case?

hi mate, i had the exact same problem with my schumacher riot, the steering would turn itself left and right real quickly.
in the end i just changed servos, problem solved. never had that problem again.

:thumbs_up:

Thanks for the reply.

Its a bit costly to change the servos without trying everything else but thanks :P

Its a bit risky as well! If I change servos and I have the same problem then I would go crazy :jump:

Well the engine is OFF no problem, the engine is ON we have interfirence. What are my options?

Collin d you said: This means your servo's are straining against the steering stops or full throttle/on the brakes.
Since I am still a novice could you please explain a bit more
:D Also wouldnt the problem be happening with the engine off as well?

yes mate, im pretty sure it would still be happening when the engine is off too.

hmm your problem really is a hard one.

as it does originally sound like a flat reciever battery problem, but if you have charged it fully and it still does it then obviously that one is counted out.

you sad you have sent it back and it came back not faulty, so thats not it either then.

so all i can think of is the servos mate, the same problem i had.

because i have never heard of any interfierance when using 2.4ghz technology

:thumbs_up:

On your radio you have EPA (end point adjustment).
You can alter this so the servo's are not straining, should explain it in your radio's manual.
What buggy do you have??
Some people have had trouble with the receiver overheating.
This appears to be on buggy's with the receiver mounted close to the engine.
Do you have the receiver padded with foam?
Could be a vibration issue on the receiver, if it is mounted solid to the car?

I have set the EPA from before. It was one of the first things I did so I guess its not that.

My car is an XB808 2010 specs.

Its not overheating since it happens even at the very begining when I start it up.

The receiver isn't padded with foam but its not mounted solid on the car either. I tried padding it with a few pieces of cloth once just to see momentarily if the vibrations caused the problem but it didn't fix anything. I also asked in a couple of rc shops if it needs foam padding and they said that this receiver shouldn't need any.

This may sound odd, but do you turn on your radio first then reciver?
Have seen a few people have a problem, as they turned on receiver first. Then radio.
Where are you based? is there a local club to you?
If there is a local club, pop down with your car & ask a few people who are using the same radio. If they have had the same problem?
As I said before I use Savox servo's & Futaba 2.4 in a CRT.
Only time I had trouble was a runaway,caused by a faulty/old receiver battery pack.

Just another thought.
As you have the 3vcs radio, do you know anyone who has a futaba set up on crystals?
Borrow their transmitter module & receiver, & see if it still does the same thing.

I know that my battery has a capacity of 1600 mA but when I discharged it completely and charged it again the charger indicates that it charged it with 980 mA. Does that seem odd?

Also when I begun to discharge the battery, the battery checker indicated that the battery wasn't "safe" and it was in the "attention" levels and I only used the battery for 3-4 minutes of buggy runtime. Does that seem odd as well?

if u still having this problem what it is is the batter
what is happing in the e soldering has come slighting lose
so when then engine is off it will work fine
but when the engine is on it shakes the battery and the conneshon comes and goes
this happend on my buggy at the weekend
just get a new battery and try it
but i am 75% shore this is what it is


hope this helps
adam