Quote:
Originally Posted by PQ
OH. I can screw anything up. lol
But, I actually noticed exactly what you are talking about. That the set screw and metal flat part on the plunger arm will have a small gap from time to time. Next time it surges I'll get right out and look and play with it. As I type this it is touching like it should.
BUT
When the car is idling with not boost that arm is open all the way. It only closes at boost. The manifold vacuum holds that actuator up away from the set screw under vacuum.
Unless I missunderstand you.
Ideally I"d create boost WITH bigger headers for even more power at the same boost with a less compression ratio.
But boost is boost. Displacement changes will always effect power.
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You are correct, my bad. The valve will be OR should be full open at idle unless something isn't right. I have seen tunes with terrible idle that had no vacuum. The tune could be of causing the surge. Check it with the car off too see if it is against the set screw or if the arm is holding it up. IF it is against the set screw, then back it out one full turn. Another thing that can drop boost is lowering compression. Same with adding heading, it lowers boost.