vIWG Wastegate Actuator Suit BMW N20 Engines – 6inHg
$233.28USD (Excl. Sales Tax)
Turbosmart Upgraded Vacuum-operated Wastegate Actuators have been developed to provide the maximum possible boost response for your factory frame turbocharger. The Turbosmart vIWG Series of upgraded Actuators benefit from an increased ‘Working Ratio’ over the factory equipment resulting in improved boost response, throughout the RPM range.
This Improved ‘working ratio’ is achieved through an increase to the effective surface area of the diaphragm & revisions to the actual springs fitted resulting in greater leverage of the forces the actuator is working against (boost and backpressure) while still being super-responsive.
Upgrading with the same base pressure as factory, you can expect a broader boost & torque curve through peak boost being achieved earlier in the RPM and being held longer, into higher RPM. These improvements can be amplified with higher base pressures, however tuning & recalibration is recommended for optimal performance.
Proprietary Silicon Nomex Diaphragm
High-Grade Billet Aluminum Construction
Stainless Steel Rods and Clevis
Turbosmart Unique Locking Collar System
This is a bolt-on fitment for the factory turbocharger as fitted to the 2.0L BMW N20 Turbo engine with a pneumatic vacuum actuator.
It is the responsibility of Turbosmart to warn its customers and employees that some products sold on this website contain chemicals known to the State of California to cause cancer, birth defects or other reproductive harm.
This product does not have a CARB EO #; it is not legal for sale or use in CA on pollution controlled motor vehicles. This is intended as a "Race Only" product to be used solely for competition. It's use is limited to closed-course and open-course racing that is formally sanctioned by a recognized racing organization; any other use including recreational off-road use, may be a violation of local, state and federal laws. It is the buyer's responsibility to verify legal use of this product for the intended application and use.
vIWG Wastegate Actuator
Springs Pre-Fitted as per Description
Required Fasteners & Swivel Hose Barb
1/16” NPT to -3AN Male to Male Adaptor
1/16” NPT to -4AN Male to Male Adaptor
1/16” NPT to 1/8” NPT Male to Female Adaptor
vIWG Actuator Collar Tool for 76mm Diaphragm
Ensure you have an overboost cut-out. This is a safety feature built into basically all factory, aftermarket & programmable ECUs. You can never be too careful. Make sure it is set at a sensible & reasonable limit. Increasing the boost will put more load on your engine and there are other tune-related factors you must consider. If in any doubt, speak with a professional tuner/calibrator.
What's a vacuum actuator?
n basic terms, traditional pneumatic actuators for wastegate control are boost-based, meaning they use a positive pressure to overcome a built-in/pre-fitted mechanical spring which then 'actuates' and opens a wastegate flap on the turbocharger so that exhaust gas can bypass the turbo & boost can be modulated. As the turbocharger creates more boost, the actuator has more potential force with which to overcome the spring pressure & open the wastegate flap. With Vacuum-Based Actuators, however, the reference signal is a vacuum (negative pressure) instead of boost (positive pressure). This vacuum is generally sourced from a vacuum pump fitted to the engine (Either a mechanically driven, or electronic). The vacuum, unlike boost-based systems, is consistent and does not change based on the boost pressure, RPM's or power the engine is producing. Due to this boost control strategy is very different from a boost-based system.
Why would I upgrade my vacuum actuator?
he simple answer is leverage. We have created bolt-on upgrades for various vehicles fitted with vacuum actuators from the factory as when tuned, the forces can be greater and higher boost levels can be harder to achieve. As the additional boost cannot be used to assist with holding boost like a boost-based system and the tuning window is limited. By utilizing the improved working area & revised springs selection of a Turbosmart Vacuum vIWG you can expect to increase boost pressures to new, higher levels than your factory actuator.
Why would I retrofit a vacuum Actuator to my boost-based setup?
There are a few reasons you might consider this based on your turbocharger system, however, the most common we have come across is to assist with achieving cold-start emissions requirements. Traditional Boost-based pneumatic actuators require boost (positive pressure) higher than the base spring pressure in order to open and while this generally does not cause any issues, it may do if your goal is to open the wastegate flap for cold starts. Often manufacturers use this strategy of opening the wastegate flap on cold starts at idle in order to increase the warm-up rate of the emissions devices such as catalytic converters. Cold-start conditions are often the hardest part of gaining emissions compliance for upgraded and modified cars and a retro-fitted vacuum vIWG from Turbosmart can help.
What do I need to do to control it?
You will need an ECU and solenoid in order to manipulate the actuator successfully. The boost control strategy will be different from that of a boost-based system and if your vehicle was already fitted and calibrated for a vacuum IWG, returning and calibration will likely be required. As with all boost control changes, air-fuel ratio, torque and power must be checked.
What is twin port control?
The Turbosmart vIWG Vacuum Actuator series has been engineered with a second chamber on the other side of the diaphragm which means you can boost assist. This will require a more advanced strategy and setup however plumbing positive pressure from the inlet manifold or turbocharger directly, or via a solenoid will allow a custom, much wider tuning window. What size is the reference fitting? The swivel banjo and fitting in the top cap is a -3AN, and the lower (optional) positive Pressure Assistance Port for Boost-Assist is 1/16NPT.
Various BMW models with N20 (N20A20 and N20B20) engines where a vacuum pneumatic actuator is fitted.
*Not Suitable for Engines fitted with an electronic actuator.