well according to that link it said that the forge DV caused some delay to recirc the air. also leaves back pressure.
quick recap...
In conclusion:
- Forge vs OEM showed no significant improvement in boost holding capability
- Forge vs OEM showed no significant change in boost ramp-up
- Forge exhibited no improvement in mid-range and upper RPM boost over OEM
- Forge showed a ~.3s decrease in response over OEM when recirculating boost
- Forge exhibited comparable rate of releasing boost to OEM
- Forge increased backpressure on turbine compared to OEM, as observed by a 3-5psi pre-throttle body spike.
- The Forge valve is still a mechanical diverter valve and still relies on vacuum from the throttle plate for recirculating boost, whereas the OEM DV relies on electricity to retract the piston and recirculate boost.
EDIT: I have APR STAGE II right now with the Forge DV. i dont feel any significant increase in throttle or holding boost (according to my boost gauge).