do i put a return spring on the servo arm or the carbie thoat shaft

won,t the servo be working over time pulling on the spring as well

It depends on what car you have.

Just make sure that it has enough pull to bring the servo arm and throttle arm back to the closed position.

Also get a voltage checker to check the voltage of your batteries before you run.

Here is my RC10GT with Spring.

Racing rules state that the spring must be attached to the arm on the carb and not to the linkage or servo horn.

won,t the servo be working over time pulling on the spring as well
Yes the servo has to work harder to against the spring and some lighter servos may have a hard time doing it.

Let me ask you this... Would you rather have a little strain on the servo so the life is cut down a tad or, would you rather run the risk of having a runaway causing an unknown amount of damage to your vehicle and/ or someone else's and possibly blowing up your engine?

Its a simple choice for me.

Man, pushing the throttle around requires like no work!!
If your worried about the throttle servo, think about what the steering servo has to put up with!

And I've witnessed what a runaway car can do to itself first hand (not my car tho..lol) Its NOT pretty!
-ram

Where would I get a spring to put on the snr I am receiving?

Well.. I screwed down the spring holder eyelet with one of the existing screwes, and I attached the spring to it.
I dont think placement of the spring is such a big deal as long as you follow these "rules"

!) Find a good spot where it has good tension, but isnt stretched so bad that it pops off
2) Make sure it DOESNT TOUCH or RUB ON ANYTHING!
This CAN cause radio noise
3) Dont attach it to something that moves (the other side..)
4) Mine hits the brakes a little if the servo battery dies.. yes the servo has to fight this.. but its soo mild it shouldnt matter!
-ram

What about using a failsafe unit in addition to the return spring. Is this just overkill or worth the 30 bucks? Below is the unit I was looking at.....

http://www.rcxpress.com/dynracguarfa.html

tracy

From what I've herd about a fail safe I would say it is definetly worth the money. A car going full throttle the other direction can COMPLETELY destroy itself. Which is not fun to go and pick up the pieces. When I got my little brother his first RC car he had just got done breaking it in and wanted to run it for a little bit but I had to go out and when I can back I found out that the batteries were bad. And so he started it up and after he got about 30 feet from him the car took off the otehr direction at full throttle and went straight into a curb. I had to replace the whole front end and the top and bottom chassis. So I can say from experience its worth the 30 bucks. I ordered fail safes for my cars and I would suggest you do the same.

I use both failsafe and return spring. It is one of the best few bucks I have spent. I have also experienced a runaway once and swear to myself it will not happen again.

At a minimum, use a return spring. It is like $2.50 for a pair of those safety net.

Easily missed point

WHAT IS YOUR SERVOS DEFAULT POSITION??

IF your reciever loses control of the radio.. this is where it will go

If this is set at full throttle.. God forbid..
I dont care how many throttle return springs you have, your servo is going to fight it and try to crash your car!!
Make sure your servos "default postion" is set to Brake or at least IDLE..

To find out what this is.. leave your radio off and turn on the reciever.. where does it go? does it hit the brakes?
If it does.. this is what it will do when you lose control!

The only time a throttle return spring will help is if your servo batteries die when the throttle is stuck at "full speed ahead"!

I hope all info is correct!
-ram