Product Description
The T9386 DV+ expands your options for BMW models. It is designed as a complete drop-in replacement for the OEM diverter valve in BMW N13, N20, and N55 engines and offers all the benefits you’d expect from a DV+:
- Sharper throttle response
- Faster boost recovery after brief throttle lift
- Improved boost holding
- Unrivalled longevity, backed by our Lifetime Warranty
- The new T9386 features a low-profile integrated solenoid, offering BMW owners some additional benefits:
Multi-vehicle fitment – T9386 will fit all vehicles currently covered by T9356 and T9357
- Shorter overall height – this is particularly useful on N20 and N55 installations where space is limited
- Doesn’t re-use the OEM solenoid coil – it is common for OEM solenoid coils to crack as they age. The T9386 uses its own solenoid to eliminate this issue, whilst making installation easier at the same time!
- The DV+ ensures ultimate boost holding and durability, and the best possible throttle response!
Improved Boost Holding
Since electronic OEM diverter valves first appeared in the mid-2000s, there have been many revisions over the years in an attempt to address reliability issues. Whilst the latest generation of OEM diverter valves have become more reliable, there is always a performance trade-off due to their operational method and plastic construction.
When GFB engineers performed boost leak testing on the OEM diverter valve in a C63S, they found the leak was significantly larger than in earlier generations.
This excessive leaking is due to the emerging trend of manufacturers mounting diverter valves remotely on plastic piping rather than directly on the turbocharger. A plastic valve mechanism closing onto a plastic seat resulted in the largest OEM diverter valve leak we’ve seen yet at 28L/min at 1 Bar of boost.
Even with the Viton face seal (featured on all DV+ pistons), the plastic OEM seat face was found to be so uneven that it was impossible to achieve a reliable seal. The T9380 successfully addresses this issue by incorporating an integral piston seat machined into its body. This design ensures a proper seal, even on uneven plastic OEM seats.
Sharper throttle response, faster boost recovery after brief throttle lift
Factory electronic diverter valves are binary in operation – they’re either open or shut. Your throttle, however, isn’t. When you make small throttle adjustments, the binary operation of the factory diverter results in abrupt changes in power delivery, which is the very definition of poor throttle response.
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