GFB (Go fast bits) Australia has recently added another item to the repertoire one we think any Ecoboost owner will be happy to hear about. The DV+ Bypass Valve is now offered for Borg Warner turbo applications. By retaining the factory ECU control and recirculating the vented air, the DV+ valve is a purely performance oriented product that offers sharper throttle response and faster boost recovery during shifts. For the consumer building with performance in mind this is an obvious choice but there are also other aspects that make the DV+ line a must have for even the daily driven project cars.
First of all, tuned engines running high boost also produce a lot of heat in the charge air. Because the bypass valve is situated right on the compressor, it is subjected to the hottest part of the intake charge, and the heat from the compressor cover itself. This can cause the factory diaphragm to rupture, and if that happens and goes undetected for a while, it can cause damage to the turbo, as the ECU will try to compensate for the lost boost pressure by increasing turbo speed.
Second, the operation of the factory bypass valve is not aimed at throttle response. Because of the soft spring and the solenoid valve that is in-line with the vacuum hose, it can only operate in two states; fully open, or fully shut.
The factory bypass valve does not have the ability to open and close progressively in response to the existing boost pressure, and throttle response suffers when the valve vents more than it should in situations where you are not fully lifting the throttle. The T9354 for ecoboost engines in particular solves these issues using proven metal and silicone construction of the valve components, meaning the DV+ will last a lifetime regardless of the harsh conditions.
As for performance, because the DV+ features a carefully selected spring rate AND spring pre-load adjustment, it can operate progressively to help sharpen throttle response. This is the basis of GFB’s TMS principle, which has been shown to reduce the time to peak boost on gearshift by 30%. This benefit is also particularly noticeable in situations where you are modulating the throttle to balance the car in a corner.