Golf MK4

The Splitter is a truly remarkable valve that gives a combination of blow off and recirculation valve operation, all at the same time, and has been specifically designed for the many turbo engined applications that operate metered airflow management systems. This means you get all the noise of the blow off valve whilst retaining the compatibility with the recirculation requirements of the engine management system. As a bonus we also offer the ability to convert the valve to recirculation only mode for those times when stealth running is required. This valve uses a Brass piston which utilises new sealing technology along with a variable spring preload, incorporating a ratchet type top adjuster that will allow for the positive and precise adjustment to match the valve to your engine. This is achieved by using a unique single, conical, progressive rate spring, that can allow for the retention of boost pressure over a wide adjustment range. This unique spring design also allows for unrestricted piston travel and flow volume regardless of the amount of pre-load adjustment added to the spring. Other manufacturers' valves use cylindrical springs with adjustable pre-load, which often experience restricted piston travel and a reduction in flow volume. When we say our products are Engineered For Performance, it's not a catchy sales phrase, it's the truth. and we prove it with every product we manufacture. Note: This valve requires installing the opposite way to the original Bosch Valve. This means that the side pipe is fitted into the Turbo Intake Hose, and the base pipe connects to the hose that runs to the boost side of the turbo.   In The Box:1 x FMDVSPLTR Valve1 x Valve Blanking Cap1 x Instruction Booklet1 x Forge Sticker If you are unsure if this product is suitable for your application, please contact us.  The valve has a port size of 25mm         To service this valve, access the valve piston by removing the 3 cap screws at the base of the valve and simply clean the piston chamber using brake cleaner or similar cleaning fluid before installing the new spring and piston. Please observe the correct spring and piston orientation when installing the serviceable parts, as seen in the attached drawing.   Adjustment guide. First turn the valve adjustment knob all the way down in the anti-clockwise direction, which will adjust the spring it to its lowest tension. Then turn the valve adjustment knob in the clockwise direction to the appropriate tension level, as set out below. Standard engine – 16 clicks. Stage 1 remap – 21 clicks. Stage 2 remap – 25 clicks. These adjustment recommendations are a general guide and you may find that your engine requires fine tuning by 1 or 2 clicks in either direction to achieve optimum performance. There will be no significant performance benefit adjusting the valve over 30 clicks as the spring will have reached its maximum operating tension.     Please Note: In line with our policy to constantly review, revise, and improve our product range, the appearance of the product you receive may differ from the one advertised.   Fits Multiple Vehicles

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This turbo recirculation valve is the result of of 25 years of experience and engineering expertise. With the reputation for innovating and manufacturing the best automotive valves in the world, you can be certain that there is currently no better replacement valve available. The FMDV008PA version seen here has the benefit of a 90 degree vacuum port, that can be rotated to three different orientations. This is often the preference where either space is restricted, or the original fitment valve has a 90 degree connection, either on the valve or connecting hose. Forge's recirculation valve features a greater flow rate than the OEM Bosch Valve, as well as a faster response time, due to our revised design. By using the associated service kit (FMDVSK), as seen below, the life of the valve can be extended, and the performance can be maintained. With a lifetime guarantee, you can be sure the valve is reliable for your car.  It is fully customisable to fit your application with two uprated springs provided in the kit. Forge Motorsport's improvement on the original valve has a compact design, meaning easy fitment under the engine cover. Please select whether you want a black or matt silver valve, using the options above. In The Box:1 x FMDV008PA Valve1 x Uprated Yellow Spring1 x Uprated Blue Spring1 x Cable Tie1 x 2.5mm Allen key2 x 35mm Hose Clamps1 x Instruction Booklet1 x Forge Sticker Click here to see our video on how to service this product *Porsche 991/911 Turbo will require 2 Valves - please see our seperate product (FMDV008P2 below)* The valve has a port size of 25mm If you are unsure if this product is suitable for your application, please contact us.    Please Note: In line with our policy to constantly review, revise, and improve our product range, the appearance of the product you receive may differ from the one advertised.   Fits Multiple Vehicles

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