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Old 02-23-2009, 05:04 AM   #1
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Unhappy Runaway car

some body please help me my car keeps running away from me. It nearly ended up on the track at knockhill in the middle of a speed sunday and i broke the clutch. How can i stop it from running away from me. please help me
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Old 02-23-2009, 05:14 AM   #2
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Tell it you love it and see if that keeps it around

Seriously though, any idea of what caused the runaway? It could be many things such as:

- Receiver pack run dead
- Receiver pack comes unplugged
- Throttle linkage binding up
- Radio switch turning off/failing
- Stripped gears in throttle servo / stripped arm on throttle servo
- Receiver failure
- Transmitter failure or out of range

You need to find the problem to 100% cure it, so try to think if there was any common conditions when it happens.

You can use a throttle return spring on the carb that might work in a radio/servo failure, but it depends on where the failure is. No spring is going to be strong enough to close your throttle if the servo is working to keep it open, so that really only works on broken links, stripped servos, and the like. Also if your receiver has a fail-safe option make sure it's set, in the event that you're getting out of radio range or losing power on the transmitter or receiver.
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Old 02-23-2009, 05:19 AM   #3
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Unhappy

Quote:
Originally Posted by Miller_Time View Post
Tell it you love it and see if that keeps it around

You need to find the problem to 100% cure it, so try to think if there was any common conditions when it happens.
.
have told it that i love it and showed it but everytime i take it out it works fine for bout 5 min then just runs away in a straight line. have took it about and checked it all but couldnt find anything wrong with it.

i miss her and just want her to work
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Old 02-23-2009, 06:38 AM   #4
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What type of reciver pack do you run? 4 AA batteries in a plastic holder is bad news.

The way the reciever antenna is run can cause problems.

Crystal radio or other?

Definatly instal a throttle return spring.

How bout some pics showing radio instalation.

You might want to have a freind help you do some radio range testing.
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Old 02-23-2009, 06:47 AM   #5
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I use a rubber band on the throttle linkage. It's cheap and saves motors
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Old 02-23-2009, 07:15 AM   #6
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A Rubber band is recommended but not 100% protection. I would start with the battery. Also I had a DX3 radio and the antenna internal connection came loose. I had to take the radio apart and reconnect it. If it is an FM make sure the antenna is straight and high up.
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Old 02-23-2009, 07:23 AM   #7
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Is it a 4pk radio system? LOL Mine over heated with 3 different receivers over the summer. Nice after I spent over $500 over the damn thing!

But I have to say thanks to Scott Cramer for taking care of the problems asap!
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Old 02-23-2009, 07:47 AM   #8
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What type of reciver pack do you run? am not sure but will find out and get bk to you

4 AA batteries in a plastic holder is bad news it defo has these.

The way the reciever antenna is run can cause problems.

Crystal radio or other? eh crystal

Definatly instal a throttle return spring.

How bout some pics showing radio instalation. will put pics up of it soon

You might want to have a freind help you do some radio range testing
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Old 02-23-2009, 07:55 AM   #9
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Quote:
Originally Posted by ukemokid View Post
What type of reciver pack do you run? am not sure but will find out and get bk to you

4 AA batteries in a plastic holder is bad news it defo has these.

The way the reciever antenna is run can cause problems.

Crystal radio or other? eh crystal

Definatly instal a throttle return spring.

How bout some pics showing radio instalation. will put pics up of it soon

You might want to have a freind help you do some radio range testing


get rid of the 4AA batterys, get a good nimh battery.

and since your on a crystal that can cause issues if someone else is on the same crystal as u but you said it happens everytime your as the track so...
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Old 02-23-2009, 08:02 AM   #10
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no it happened at knockhill when all the normal full size real cars where racing but dont know i radios or that could interefer
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Old 02-23-2009, 08:10 AM   #11
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Default Futaba failsafe

Not sure if it will work on what you are running, but I put one of these on my Nitro Rustler about a year ago when my battery tray door fell open on the handheld and I happened to be at full throttle!. Good thing it hit a sloped fence that shot it straight in the air. Any way it hooks in-line with the receiver to the battery tray on the car. If the voltage drops low it will apply the brakes. The only thing is it relies on the pack on the car so you have to have a good charged secure tray on the car. This is more designed for losing handheld transmission or if the onboard tray batteries drop too low on the voltage.

http://www.futaba-rc.com/radioaccys/futm0992.html
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Old 02-23-2009, 09:07 AM   #12
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Quote:
Originally Posted by ukemokid View Post
What type of reciver pack do you run? am not sure but will find out and get bk to you

4 AA batteries in a plastic holder is bad news it defo has these.

The way the reciever antenna is run can cause problems.

Crystal radio or other? eh crystal

Definatly instal a throttle return spring.

How bout some pics showing radio instalation. will put pics up of it soon

You might want to have a freind help you do some radio range testing
The 4 AA batteries in a plastic holder for a reciever pack will cause lots of problems. As the car bounces, or gets thrown around, the batteries loose contact in the holder and the servos stay in the last position until power is restored. There are a couple of short term fixes but they are not very reliable. For example wrapping rubber bands lengthwise around the battery holder and installing a throttle return spring. Best solution is to get a rechargeable reciever pack.

With crystal radios, sometimes the crystal comes loose in the reciever. Be sure it's fully inserted and use some foam around the reciever to help protect it from vibration. Crystals can go bad also. Most last for years but, once in a while you get a lemon.
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