bov no recirculating?? compressor surge?

[SpyderGSX07]

i have a 97 2.4l dohc turbo 4g64. hard piping. greddy bov. now. the problem is i do not believe when i get off throttle that it is recirculating properly. and if i only boost from 2 - 5 psi and let off throttle, it sounds like the air is coming back out the turbo (sounds like a diesel when of throttle). and when im on full boost and put the clutch in it dips below idle and almost dies. sometimes it does quit. the bov sounds like it chatters a bit too. When the the car is not moving, and i rev it up to about 3500 rpm's, the bov does not operate. i have tried different bov and they do the same thing. the vacuum line is hooked up right onto the intake manifold. and it is recirculated into the intake. i am using a 95 eeprom. 96 wiring harness, 97 4g64 block, and a 96 head. is the vacuum wrong? is the bov set too soft? i just dont know. i dont want this little t25. but why wreck a good turbo. thanks for your help!

[goodhart]

Compressor surge is only during spool up. If the BOV chatters a bit after you let off the throttle, that is normal. If you hear the "chatter" during spool up, that is compressor surge. Also, when you say you rev it to 3500, and the BOV does not operate, is that when you are stopped and free revving, or while driving?

Is the car tuned? Does the car know it has a 2.4 in it? lol Maybe that is why it keeps dying.

[95talonracer]

Justin you just need to tune it. You are running all stock fuel and tuning for a 2.0 on a 2.4. It doesnt matter if it is all stock ecu, injectors, turbo and all because your engine is still 20% larger displacement then stock. Im sure that t25 hates life too :)

[SpyderGSX07]

okay thanks man... need that damn tune... and ya.. when i free rev it, it doesnt operate.

[goodhart]

okay thanks man... need that damn tune... and ya.. when i free rev it, it doesnt operate.

When you free rev a car, it usually won't build boost because there is no load on the engine. No boost=no vvvvvvrrrrrmmmmm pppsssshhhhhhhh :lol:

[SpyderGSX07]

hm.. well why does every other turbo vehicle do it. like a full 100% throttle to about 3500 rpm plus and snap the throttle shut. shouldn't the bov release the little bit of boost just created?

[jrohner]

Get a 1G BOV instead of that POS, and you'll be fine.