Compressor Surge or something Else?

[Lockfinn]

Car Mods: Evo 16g, intake, bov, uic pipe, boost gauge, mbc.

Just installed the uic pipe and a greddy type RS bov, when I floor it it gets up to about 5k rpm (16 psi) and then starts blowing off and losing power. Also, when I let off the gas the BOV blows off ~3-4 times. I already tightened the screw on the top of the BOV as tight(hard) as it goes. Is this compressor surge or another problem? Will the single spring mod help this? Thanks.

 

[CanadianTSi]

Do a Boost Leak Test, also check the Vacuum line going to the BOV for any rips or anything.

 

[Lockfinn]

Do a Boost Leak Test, also check the Vacuum line going to the BOV for any rips or anything.

Vacuum line is brand new, I'll try the Boost Leak Test though. Thanks.

 

[Bender]

When you let off the gas and the bov keeps releasing, it means you have it too tight. It looks to me you thought something, then turned the adjustment screw the wrong way. Back it out until it's about halfway in, and the adjust it from there. The trick is to make it hold a couple more pounds than the boost you're running. This keeps it from opening prematurely (too loose), not releasing in one blow (too stiff), and acts as a relief valve in case the boost decides to spike up (hence why they are sometimes abbreviated RLF valves.

 

[turboglenn]

The fluttering sound is surge. My apexi will surge at low RPM's een with teh screw back all the way out on it. But then i hear it open and leak boost. If i tighten it much more it surges usder higher loads wher ei really don't want it to. verythings hooked up as teh factory directions say and no matter what it surges at low boost/low RPM situations. I cna't wait to build my new UICP so i can provision it for the Blitz i have sitting around.

 

[blcknspo0ln]

Yup, sounds like surge, especially if you cranked the adjustment screw all the way down. Try what bender said and start off really tight (like you are) and go do a WOT pull and see what it does. Then get out of the car and loosen it up a half turn. Keep doing it until it holds enough boost and then crank back tight a 1/2 turn.