[bubba68ss]

Im just trying to get everything tuned right. Ive been running my car harder than usual. On the highway at about 3K rpm's when i floor it, i start to accelerate and about 1.5-2 seconds after flooring it i think my secondaries are opening because i get alot of power.
Question is, should there be a 1.5-2 sec. delay in the opening? I dont think its bogging down in that delay, it just is a simple delay of power. Do i want a lighter spring or a stiffer one? I dont know what is in there now. ( i think it is a black one, but am not sure at the moment).

 

[69-CHVL]

If its the black one, you may not even be opening at all. Thats the stiffest one I think. Holley states you should keep going lighter till the car bogs, then put the next stiffer in. I'm running a silver (yellow seem to kill some torque) which is stock. I think pink is in between the 2.

I'm still messing w/this myself.

 

[mr 4 speed]

I run the 2nd from lightest yellow spring (the tall one)
purple spring works well too.

 

[bubba68ss]

i found a silver spring with black paint on the tip or it. Should i give it a try? It seems like a lighter spring. Should i be going lighter on the spring or stiffer?

 

[69-CHVL]

Thats the black spring your talking about (there all silver, just painted on top).

 

[bubba68ss]

OH! I see. Ill look for a spring kit next time im at parts store

 

[Slowpoke70]

Night and day different when going from a black spring to a tall yellow or purple. The short yellow makes mine lean out and die.

 

[zeke67]

A quick, easy way to determine how far the secondaries are opening is to clip a paper clip on the linkage sticking out the bottom of the secondary vacuum can. Position the paper clip such that it is right up against the vacuum can.

As the secondaries are drawn open, the linkage rod moves up, forcing the paper clip to slide down the rod.

Make a couple of hard runs. Then with the car turned off, you can work the secondaries until the paper clip touches the vacuum can. This is how far the secondaries where opening.