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Stock throttle spring useless

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R

rossb

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I rigged up the stock throttle return spring as per the instructions. I hooked one end on the slide, wrapped the spring around the air filter base, and then hooked the other end to the high side needle. This setup is a joke. It prevents the carb from going WOT because the return spring is stronger than the servo saver! I get a wide-open carb without the spring, but put the spring on and the servo saver just stops the linkage from going any more than ¾.

The ironic part of all this is even with the spring installed as above the spring is not strong enough to close the throttle if the receiver battery goes dead. For example; I go WOT, turn off the receiver switch, and the spring does not have enough pull to close the throttle (and spin the servo back). The throttle stays about ¾ open.

It seems to me that this spring is useless I was thinking about trying this:
http://www.hpiracing.com/rcforum/showthread.php?threadid=61610
 
It's small mod that will work very well. I have done this and it made a hugh difference.
 
Relocating the trs to the roll bar is the best thing that you can do with it. At least there it consistantly returns the throttle to idle.
 
the return spring is designed so that should the link to the slide pop off the carb will close and the truck won't go WOT into a wall. If you move it to the position you guys are saying, if the link comes off the spring isn't going to close the carb. Your best bet is to do the OFNA throttle/brake mod and ditch the servo saver all together. WHY there is a servo saver on a part that doesn't take any abuse is beyond me!
 
I noticed the same problem when I was putting my SS together. If you do the Ofna linkage mod and use a longer servo arm it will fix this problem without having to relocate the spring. I found that even without the spring installed, the stock servo arm didn't have enough throw. I still had about 2mm of the slide showing. If you do ditch the stock servo arm for a longer one, you will have to buy an extra ofna slide to attach the brake.
 
I have yet to see the linkage come off. It is more for when the truck ends up out of range, batteries get to low or by chance the battery connector comes loose.
 
I have tried both spring set ups, stock and roll bar type and neither one were great. The roll bar mod opened up the carb the same amount as stock spring set up.
I just run without a spring and make the proper carb and servo adjustments so that it does enough to idle and opens wide enough to be WOT.
For any reason you think the spring was set up as a fail safe design, it is a piss poor design in my opinion which is exactly why I added the Ofana fail safe which works wonders for me. It's not fool proof but it helps out better than any of the spring set ups I have tried.
Besides, why would you want to test the range abilities of your R/C....do you like walking pretty far just to retreive it or do you just like to see your $$$ drive off by itself?
 
The spring works wonders, even though it wears the batteries down a little sooner. My hyper 7 was hit real hard in a turn which cause it to hit the wall and flip over some how the linkage popped of the carb. Think god for the spring, new conn rods are not cheap! In that case there was no way my failsafe could of helped me. plus if you race, most tracks require them.
 
shadey26 ntc3 said:
The spring works wonders, even though it wears the batteries down a little sooner. My hyper 7 was hit real hard in a turn which cause it to hit the wall and flip over some how the linkage popped of the carb. Think god for the spring, new conn rods are not cheap! In that case there was no way my failsafe could of helped me. plus if you race, most tracks require them.
Click to expand...

SEE!? Told ya it happens :p lol
 
I dont run the spring and wont, It is a very shity design. Buy a failsafe, I've never had a carb linkage pop off in my many years and my many vehicles. Not saying it dosnt happen but its highly unlikely unless you linkages are abused and wore out.
 
hb1111 said:
i agree with jonser4yu get a fail safe very cheap now!!!
Click to expand...

I have one.

build_20.webp
 

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