I have the greddy type-s single spring mod and the top screw turn about 2.5-.275 turns. Everything seems fine, except sometimes under boost it spudders, almost as if its opening and closing really fast. Doesnt seem to happen under low boost, just when Im building to higher boost. Any ideas? And yes im recirculating.

 

mine does it too but only when i'm high boost and i slowly let off the gas. It does it other times but that is when i notice it the most. WOT i never hear it sputter.

 

Sounds like the exact same symtoms. No way to correct it?

 

not that i know of; i think that it is normal though.

 

it probably means your spring in the valve is too stiff, try loosening that screw or something...i have a forge bov VTA and it was doing the same thing, its technically called compressor surge, or flutter but its annoying. try it out

 

MINE DOES THAT TOO! Are yall using the Lower boost nipple? I am, does that have something to do with it?

 

I don't have the lower vaccumm nipple connected.

 

uhhhhhhhh? too much boost? 20PSI 2much for the type S?

 

Well I just loosened the spring a bit and it made it worse. I guess I'll try to tighten it more.

 

put the second spring back in and see how it does
https://www.evolutionm.net/forums/sh...d.php?t=113527

 

Tried with a tighter spring setting still happening..not as bad, but still pissing me off. This sucks!