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Discussion Starter · #1 ·
Reason I ask is I had new pistons made for my Blitz dump valves and also overhauled them, also replaced my inlet plenum and renewed all vacuum pipes.
Now, the vacuum lifts the pistons slightly at idle, as soon as you add revs the pistons shut and full boost is achieved, I screwed in the adjusting bolt on top of the valve and things are slightly better but pistons are still lifting very slightly. Do I need new or stronger springs? Dump valves are quite old.
 
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