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OEM - N75 H "Race" Valve
The N75 H "Race" Valve delivers higher initial boost and smoother boost over the entire RPM range on most applications. The N75 H Valve has been proven to smooth out the boost on many surging vehicles. Holds more boost all the way to redline with better spool up.
The N75 is the OEM VW/Audi part identification number for the wastegate by-pass regulator valve. This valve is responsible for controlling the movement of the pneumatic actuator which drives the wastegate. The wastegate is an internal valve in the turbo-charger which controls the amount of exhaust gas that flows over the turbo impeller generating boost. Under normal operating conditions the engine's ECU sends signals to the N75 valve asking it to open or close which adds or reduces pressure on the wastegate actuator which results in more or less boost. This particular valve modifies the normal operating parameters of your original N75 valve by delaying the speed at which these ECU signals are interpreted. The result is a higher initial peak boost and an elevated boost curve which tapers back to stock/chipped levels over the engines rev range. The result is a smoother boost curve.
Many customers who had "surging" power curves after chipping have found that not only has the new valve added extra horsepower, but has nearly eliminated any irregularities in their engines power curve and all traces of "surging." Average boost gains are 1-3psi over the rev band.
This product is for experienced 1.8T tuners.