Throttle cable problems.. either fast idle or limited throttle

[AWSOM50]

I noticed that my charger isnt getting full throttle when the accelerator is floored.  The thing on the carb is a couple of 2cm away from being wide open.

So I tightened the throttle cable which allowed me to have nearly full throttle, and its faster which is nice, but then it gives me a fast idle cause the bit on the carb doesnt go all the way back when I lift the pedal, because the throttle cable is too tight to allow it to spring back.

So, I can either have a fast idle and full throttle, or a normal idle and not quite full throttle.

Obviously I want a normal idle and maximum throttle, but I just can't think how to do this.

Any advice appreciated

[BrianShaughnessy]

Do you have a stock or a aftermarket high rise intake manifold AND / OR carb spacers?    It really makes a difference on a stock throttle cable.   There's a high rise bracket available and there's also lokar type cables that are adjustable.

[AWSOM50]

thanks, yes, I am using an edelbrock torker intake on a 440 block, holley carb with no spacers.

The thing is, and maybe I'm being stupid, but I just can't picture how a longer or shorter cable would allow me to get the full range? wouldn't it just move it forward and back?

[Chryco Psycho]

move the throttle pin closer to the throtttle shaft so it takes less distance to pull the throttle wide open

[John_Kunkel]

When using an aftermarket Holley you need the special Mopar throttle lever extension (Holley #20-7) or the throttle and transmission linkage won't work correctly.

[AWSOM50]

move the throttle pin closer to the throtttle shaft so it takes less distance to pull the throttle wide open
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this sounds interesting.  But I don't really get it.  The throttle pin is the bit on the end of the cable?  and the shaft is the bit that rotates? it seems as tho theres only place it can go...

Here is a pic

[AWSOM50]

zoomed in

[greenrt_se]

same problem here,whit rpm intake and 750 demon

[BrianShaughnessy]

Previously mentioned throttle brackets - see pics.  http://chucker54.stores.yahoo.net/thbr.html

[AWSOM50]

How will a different bracket affect the throttle range though?  Won't it just adjust it further to either end?

It's as if there isn't enough travel on the gas pedal to get normal idle and full throttle.  Or there is too much travel on the throttle linkage on the carb.

[firefighter3931]

How will a different bracket affect the throttle range though?  Won't it just adjust it further to either end?

It's as if there isn't enough travel on the gas pedal to get normal idle and full throttle.  Or there is too much travel on the throttle linkage on the carb.

The taller bracket will help with alignment problems when using a taller intake manifold. That doesn't seem to be the issue here. As long as the cable is long enough you should be able to play around with it.

To increase pedal travel you need to bend the rod underneath the pedal to increase the range of motion. I've done a few that way to tweak for aftermarket carb/intake combinations. If you need a longer cable....the slant 6 throttle cable works well and is 24in in length.


Ron

[BrianShaughnessy]

How will a different bracket affect the throttle range though?  Won't it just adjust it further to either end?

It's as if there isn't enough travel on the gas pedal to get normal idle and full throttle.  Or there is too much travel on the throttle linkage on the carb.

The length of the cable is based on the stock distance from the bracket to the carb.   If you put on a high rise manifold,  you increase the distance from the bracket to the carb.   You effective use up an inch or so of cable travel limiting full throttle.   By putting on the taller bracket,   you close the bracket/carb distance back down to the stock again. 

[AWSOM50]

hi guys, you were right about the bracket after all...  the gas pedal wasnt hitting the floor so that wasnt the issue.  I found out the reason I couldn't get full throttle is because the bracket is too high.  By setting the bit that holds the throttle cable lower down, it allows it to be pulled downwards and therefore complete the motion.

So for the moment I have clamped it in place by turning the bracket upside down, but I need to get a lower bracket long term.

Now back onto the oil pressure problem.

thanks again to all.