Throttle Return Spring

[godale03]

Hey Guys,

Are throttle return springs generic, or are they specific to model? I am doing a search on where to buy one, and when I find them they are all for specific models. Am I not looking at the right ones? How exactly to they install? I have never run a throttle return spring before... just an Ofna micro failsafe... but then again I have never owned an RC that cost what the CRT did. I think I am going to get a spring.... If I can find one. Thanks

Tom

 

[RatzoRC]

A TRS usually mounts one end to a motor mount screw, and the other to the carb.
You will have to have a good throttle servo to make up for the extra work it will have to do, do to the tension on the spring.

 

[Lessen]

some vehicles has specific TRS's but I just do mine the generic way. I take one end of an extra medium manifold spring and attach it to the carb arm, bring it around the carb and attach the other end to the manifold spring that goes around the engine (if you have one). This way you can adjust the tension by moving the makeshift TRS to different coils on the manifold spring.

 

[godale03]

Believe it or not this is a new step for me... I have known about the throttle return spring, but being the simplton I am I thought that would be enough... wrong again. So now I am scrambling to find one and figure out how it goes on, and as usual I do not know anything! LOL

Tom

 

[SkyMaxx]

You can mount a TRS just about anywhere that allows it to properly perform its job without interfering with the other moving parts of the RC.

Some mount them to the servo arm on the throttle servo so that the spring returns the servo arm to neutral or closed carb. Not recommended as this ends up not working out so well if the servo arm departs the servo...the carb can still remain wide open.

Mount your TRS to the carb arm in such a way that you get a linear pull from the spring on the arm. The spring should pull the carb to a closed or damn close to closed position. You can mount the other end of the spring (the side not attached to the carb arm) on any portion of the RC that makes sense and keeps it away from rapidly moving parts (ie spur gear or any other engine drive gear, chain or belt).

Hope this helps...

-SkyMaxx

 

[robriguez]

Due to the required strength of the spring, make sure that the part that you are mounting the spring to can with stand the pressure/force/whetever... is strong enough to hold the spring. Dont use something flimsy because it will just break possibly causing something else very expensive to break.

I learned this the hard way causing my spring to go loose and get caught up in the CB. Killed the CB, Clutch, bearing, spur, misc plastic parts near the CB, body, etc...

 

[godale03]

Thanks for the info guys. I was able to procure a spring this weekend and will try to get it installed sometime this week. I think I have it covered as to how this thing will install. I think I will attach an end to the motor mount screw and then obviously the other end to the carb. A couple of questions though.... One, how much extra stress will this put on the servo? I am running a Hitec 5998. Also when I bought the spring.... I was told that it was not nessesary because the Ofna micro failsafe would stop my rig even if the battery did dump. Is this true? Thanks guys.

Tom

 

[robriguez]

well, with no battery, where would the servo get the juice to move? A failsafe is good if you go out of range, if someone else is on your signal, or if your battery runs low. It doesn't help if you lose your battery completely like in a crash or bad landing etc... Thats where the TRS comes in because its a mechanical device and doesn't rely on the battery.

 

[godale03]

That is what I thought too... I mean unless the failsafe holds some sort of charge just enough to lock the brakes up. Who knows... I just wanted to put one on so I didn't end up with a very expensive missle! Thanks guys.

Tom

 

[SkyMaxx]

Locking the brakes up versus a WOT engine...that would be an interesting battle to be certain, but I believe the engine would win as the minor charge in the failsafe would eventually give out. Who knows perhaps the guy at the store is fast enough to catch his runaway rig.

 

[godale03]

No doubt! I bought a spring anyway though.... I would rather be safe than sorry! Besides he didn't have to pay for that CRT.

Tom

 

[Supernitro17]

so I'm guessing the best "new" way to mount a TRS is just hook a spring up to the carb arm and then to pretty much anything else ?

sounds much simpler and more reliable then my old servo mounted jobs...

 

[godale03]

That was what I took from the thread. I am going to mount mine to the carb arm, and the other end to one of the motor mount screws.... Sounds pretty simple to me now.

Tom

 

[SkyMaxx]

so I'm guessing the best "new" way to mount a TRS is just hook a spring up to the carb arm and then to pretty much anything else ?

sounds much simpler and more reliable then my old servo mounted jobs...

Depends on what you mean by "new way". I have been mounting TRS in the fashion I described for quite some time...and to date, I haven't had any problems. I have heard of people mounting them to the servo's control arm and been disappointed when the servo arm departed the servo and their ride went headlong into the immovable object at WOT.

Granted that is an extreme case, and for a racer might never happen. For a basher like myself, such damages can happen pretty easy. Since I like to ensure that my very expensive bashers get broken by me vice an out of control run, I try my best to maintain control of the speedy little buggers. And when they decide to have a mind of their own...something that kills the drive is always nice. Mechanical has always worked for me (thus the TRS). Many swear by electronic failsafes, but I have read too many stories about the problems they can cause and the times where a failsafe has caused more damage than running without one.

It is entirely up to you...do the research. Choose what is best for you...and then make it happen.

 

[SpitFireV12RR]

I also have a question. My buggy has no where to really mount the spring directly from the carb throat. Is it possible to stretch the string around some object so that it is connected sort of like an L ?

 

[SkyMaxx]

As long as you have a linear pull on the carb arm...meaning that the spring is not pulling to the side putting sideways force on the carb arm. I have seen a number of mounting configurations where the spring is wrapped around the engine head or tied off to a engine mount screw. You can mount it in any fashion that allows the spring to pull the carb closed and does not put the spring into the moving parts (clutch bell, spur gear, tranny, etc.)

 

[SpitFireV12RR]

I was also thinking of drilling an extra hole on my chassie's edge so I have a place to mount a dowle and screw it in, connecting the spring to that.

 

[SkyMaxx]

That is always a viable option.