Anti-Lag Valve Explained • Turbosmart #KeepOnBuilding
February 14, 2019 News

Anti-Lag Valve Explained

TS-0552 1402 ALV40 Flow

The all-new addition to the Turbosmart line-up is the fresh air ALV40 (Anti-Lag Valve). They are designed to create a broader market for motorsport applications.

The anti-lag valve provides a means to maintain turbine speed, eliminate lag on gear changes & deceleration. This is achieved by allowing incoming charged fresh air from the turbo to be diverted safely into the exhaust manifold pre-turbo with the throttle at low opening angles to allow for safer spooling of the turbocharger, without the potentially damaging throttle based late combustion event style anti-lag that can induce high engine stresses and break connecting rods. 

When the ALV valve is active, boost pressure is diverted around the engine (instead of going through it) into the exhaust manifold. Combined with fuel and ignition strategies (from the ECU), the turbo speed is maintained, and more importantly, a useable boost is ready for when the throttle is opened again.


ALV40 Features

The ALV40 features a 40mm valve diameter, a purpose-designed actuator housing with a sealed twin-chamber design and the top port being the primary control port. The spring is designed to open under vacuum conditions to allow the air to bypass the exhaust manifold. The lower chamber is utilised for twin-port control methods to control the valve irrespective of manifold pressure. The shaft seal allows for leakproof operation. Also, multiple fittings are supplied for ease of fitment and fabrication.

Developed for a variety of engine configurations; an outlet weld flange is required to be purchased separately to the correct application. The outlet system you require will depend on how you intend to plumb your ALV40 to your exhaust manifold. There are options to suit virtually all internal combustion engines either by plumbing into each cylidner runner, every 2nd cylinder runner or even into just 2 seperate turbocharger scrolls. Outlet flanges to suit multiple outlets (listed below) will need to be purchased seperately

For custom outlet plenums, use Single Outlet  (TS-0550-3101) to allow for the fabrication of your own solution.

Inside the box you will find:

  • Turbosmart GenV ALV
  • Valve Seat
  • Inlet & Outlet V-Band Clamps
  • Inlet Hose Adapter 1-1/2″ OD
  • Inlet Weld Flange 1-1/2″ OD
  • Collar Tool
  • Fitting Kit
  • Inlet O-ring
  • Turbosmart Decal



Here is a handy self-help guide to helping you with your Turbosmart install and answers to some of the most frequently asked questions we get here. Turbosmart recommends that you get your products fitted and tuned by a qualified technician. If you choose to install the product yourself, ensure you have all the necessary tools and technical knowledge to perform this task.

Thank you for picking up the latest Turbosmart catalogue. As we look back on 25 fantastic years of innovation and growth, we continue to look towards the future as we release some revolutionary new products that will cement our reputation as innovators and market leaders.

Please contact us here and fill out a quick form so that our team can efficiently help you!

Custom setup and need advice?

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Nearly 30 years ago, I embarked on this incredible journey of founding Turbosmart, and as we step into 2024, I've never been more proud of the Turbosmart team. We are on the verge of our most exciting chapter yet, as we unveil a monumental achievement—our new line of cutting-edge Turbochargers. Turbosmart is more than just a business; it's a community of enthusiasts dedicated to constant innovation in our products, support, and service. Thank you for being so supportive, and here's to another year of innovation and achievement with Turbosmart! #Engineered to Win!

Turbosmart Anti-lag Valve Range

Engineered to Win!

The Turbosmart Anti-Lag Valves Range provides a cost-effective fresh-air Anti-Lag system for internal combustion engines.

About Turbosmart

From our humble beginnings to establishing ourselves as a global brand, Turbosmart is well on track to lead the future in turbo technology.

Our engineers build and track-test all products in-house. Therefore, we ensure we continuously produce the highest-quality, highest-performance Turbochargers, blow-off valves, wastegates, boost controllers, fuel pressure regulators, oil pressure regulators and more. Furthermore, our products are designed and built for track and street applications.

Anti-lag | Do you have the best boost Response?

Engineered to Win!

Anti-lag is already a well-proven option to improve boost response on turbocharged engines, but Turbosmart has a new way to implement it via their Anti-lag valve. Traditionally anti-lag is operated via the throttle body, whereas Turbosmarts ALS valve does things a little differently, as explained by Andre at the 2018 Performance Racing Industry trade show.

eBoost 2 Basic Setup & Tech Tips

Engineered to Win!

eBoost2 is a fully featured programmable electronic device. 

eboost2 Setup

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