Mercedes-Benz Go Fast Bits DV+ T9388 Diverter Valve

In stock for immediate Dispatch

The T9388 is the most recent addition to GFB's DV+ series of diverter valves. It serves as a direct replacement for the OEM diverter valve found in newer Mercedes models. Unlike previous versions made by Pierburg, the latest AMG-branded OEM valves cannot be taken apart and used in a DV+. To address this issue, GFB created the T9388 with an integrated solenoid that has a low-profile, making it a seamless swap for both AMG and Pierburg diverter valves. This allows for a smooth installation process without any clearance concerns.

Like all valves in the DV+ range, the new T9388 delivers the following benefits over the OEM diverter valve:

• Improved boost holding
• Sharper throttle response
• Faster boost recovery after a gearshift or brief throttle lift
• Unrivalled longevity, backed by our Lifetime Warranty

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 has 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 intercooler tanks 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 T9388 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.

The DV+ patented “pilot actuation” system allows the piston to open and close progressively, thereby smoothing the power delivery during throttle modulation, and ultimately improving throttle response.

Unrivalled longevity, backed by our Lifetime Warranty

The combination of precision manufacturing, attention to detail, and robust materials mean the DV+ will last a lifetime. So does the warranty!

Instructions

T9388 Instructions

Vehicle Compatibility 

• MERCEDES-BENZ S-Class S400 Note : Two Valves Required
• MERCEDES-BENZ E-Class W213 E200/E250/E300 (2016-2019) Note : M270/M274 ENGINES ONLY
• MERCEDES-BENZ E-Class W213 E200/E250/E300 (2016-2019)
• MERCEDES-BENZ C-Class C180/C200/C250/C300 Turbo (Not Kompressor) 2011-2018
• MERCEDES-BENZ GLC 200/250/300 (2015 - 2021)
• MERCEDES-BENZ C-Class C180/C200/C250/C300 Turbo (Not Kompressor) 2011-2018
• MERCEDES-BENZ GLC 200/250/300 (2015 - 2021)
• MERCEDES-BENZ GLA-Class X156 GLA180/GLA200/GLA220/GLA250 (2014-2019)
• MERCEDES-BENZ C-Class C180/C200/C250/C300 Turbo (Not Kompressor) 2011-2018
• MERCEDES-BENZ C-Class C180/C200/C250/C300 Turbo (Not Kompressor) 2011-2018
• MERCEDES-BENZ E-Class W212 E200/E250 (2009-2016)
• MERCEDES-BENZ A-Class W176 A180/A200/A250 Turbo (2012-2018)
• MERCEDES-BENZ A45 AMG (Facelift Models Only) (2015 - 2018)
• MERCEDES-BENZ CLA45 AMG (Facelift Models Only) 2016 - 2018
• MERCEDES-BENZ E-Class W212 E200/E250 (2009-2016)
• MERCEDES-BENZ B-Class W246 B180/B200/B220/B250 (2011-2019)
• MERCEDES-BENZ CLA-Class C117 CLA180/CLA200/CLA220/CLA250 (2013-2019)
• MERCEDES-BENZ E-Class W212 E200/E250 (2009-2016)
• MERCEDES-BENZ SLK 200/250 (R172)
• MERCEDES-BENZ SLK 200/250 (R172)
• MERCEDES-BENZ C-Class C180/C200/C250/C300 Turbo (Not Kompressor) 2011-2018
• MERCEDES-BENZ C-Class C180/C200/C250/C300 Turbo (Not Kompressor) 2011-2018
• MERCEDES-BENZ CLA-Class C117 CLA180/CLA200/CLA220/CLA250 (2013-2019)
• MERCEDES-BENZ B-Class W246 B180/B200/B220/B250 (2011-2019)
• MERCEDES-BENZ B-Class W246 B180/B200/B220/B250 (2011-2019)
• MERCEDES-BENZ A-Class W176 A180/A200/A250 Turbo (2012-2018)
• MERCEDES-BENZ A-Class W176 A180/A200/A250 Turbo (2012-2018)
• MERCEDES-BENZ GLA-Class X156 GLA180/GLA200/GLA220/GLA250 (2014-2019)
• MERCEDES-BENZ GLA-Class X156 GLA180/GLA200/GLA220/GLA250 (2014-2019)
• MERCEDES-BENZ CLA-Class C118 CLA180/CLA200/CLA250e 1.3T (2019-On)
• MERCEDES-BENZ A-Class W177 A160/A180/A200/A250e 1.3T (2018-On)
• MERCEDES-BENZ GLB-Class X247 GLB180/GLB200 (2018-On)
• MERCEDES-BENZ B- Class W247 B160/B180/B200/B250e (2018-On)
• MERCEDES-BENZ A-Class W177 A160/A180/A200/A250e 1.3T (2018-On)
• MERCEDES-BENZ C63 & C63 S AMG 4.0TT (2016-On) Two Valves Required
• MERCEDES-BENZ S63 AMG 4.0TT (2018-2020) Two Valves Required
• MERCEDES-BENZ CLA35 AMG 2.0T (2020-On)
• MERCEDES-BENZ GLC43 AMG 3.0TT (2019-On) Two Valves Required
• MERCEDES-BENZ AMG GT 4.0TT (2019-On) Two Valves Required
• MERCEDES-BENZ AMG GT 4.0TT (2019-On) Two Valves Required
• MERCEDES-BENZ C-Class C300 2.0T (2019-On)
• MERCEDES-BENZ G63 AMG 4.0TT (2018-On) Two Valves Required
• MERCEDES-BENZ E63 & E63 S AMG 4.0TT (2018-On) Two Valves Required
• MERCEDES-BENZ E63 & E63 S AMG 4.0TT (2018-On) Two Valves Required
• MERCEDES-BENZ GLC63 & GLC63 S AMG 4.0TT (2018-On) Two Valves Required