GenV ALV40 Anti-Lag Valve
$509.94USD (Excl. Sales Tax)
The Turbosmart ALV40 (Anti-Lag Valve) is a fresh air anti-lag bypass valve for motorsport applications. Featuring a 40mm valve diameter and a purpose-designed actuator housing. Multiple fittings are also supplied for ease of fitment and fabrication.
The ALV40 Fresh Air Valve allows for incoming charged fresh air from the turbo to be diverted safely into the exhaust manifold pre-turbine wheel 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.
The ALV is a sealed twin-chamber design, with the top port being the primary control port. The spring is designed to open under vacuum conditions to allow the air to bypass into the exhaust manifold, the lower chamber for twin-port control methods, control the valve irrespective of manifold pressure, and the shaft seal allows for leakproof operation.
Twin Chamber Control
Suitable for Boost or Vacuum
Clockable Actuator Housing
Optional 1-5 port outlet flanges
Nitronic 60 Valve Guide & High Temp 347 Ss Body
17/7 PH Stainless Steel Springs
Strap Type V-band clamps
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.
GenV ALV40 Valve Seat
GenV Replacement V-Band Nuts
GenV Inlet V-Band Clamp
GenV Outlet V-Band Clamp
GenV ALV40 Diaphragm Replacement
ALV40 6-1 Weld Flange
ALV40 5-1 Weld Flange
ALV40 4-1 Weld Flange
ALV40 3-1 Weld Flange
ALV40 2-1 Weld Flange
ALV40 Inlet Weld Flange - Alloy
ALV40 Inlet Pipe Adapter 1 3/4" (44.5mm)
ALV40 Inlet Pipe Adapter 1-1/2" (38.1mm)
GenV Position Sensor Cap (Upgrade)
GenV Position Sensor (Replacement)
1/8NPT to 6mm Hose End Adaptor
1/8NPT to -3AN Male to Male Adaptor
1/8NPT to -4AN Male to Male Adaptor
1/8NPT 90º Poshloc Fitting - Hi-Temp (1/4")
1/8NPT T-Piece Pushloc Fitting - Hi-Temp (1/4")
1/8NPT Straight Pushloc Fitting - Hi-Temp (1/4")
Hi-Temp Pushloc Tubing 1/4" Black (3 Metres)
C Spanner / Collar Tool
GenV ALV40 Diaphragm Replacement Tool
Wastegate Press / Spring Change Assistance Kit
What is Anti-Lag?
The concept of anti-lag is to reduce or eliminate turbocharger lag. Turbocharger lag is generally considered the time it takes for your engine to produce a boost. Note that we say time – Not RPM. Anti-Lag is an improvement in response, it will not make a large turbo create boost earlier in the RPM range on a dyno (as an example), but a sound setup system will ensure you maintain boost between gear changes and dynamic (On / Off) throttle situations as seen in motorsports such as drifting, rallying and such.
How does Anti-Lag work?
There are a couple of Anti-Lag strategies based on your engine, vehicle and ECU. The Turbosmart ‘Fresh Air’ ALV40 is the basis of a complete bypass system where the valve opens when the throttle is closed & allows compressed air from the turbocharger to be directed into the exhaust manifold before the turbocharger – effectively ‘around’ the engine. This compressed air requires an ECU strategy of additional fuel & adjusted ignition timing to effectively ignite and control a burn in the manifold right before the turbo. This burn creates energy, which can maintain turbine speed, also known as a boost.
Is this all I need to get going?
Not really. This valve is specifically designed to do this job. However, to actuate the valve, you must operate it via a boost or vacuum. Either of these will require a charge canister to hold the boost or vacuum ready for use. Although there are many ways to do this (we recommend talking to your tuner before you decide), a common way to activate the charge canister is via a check valve/system. Then, once your canister is charged, you can use a 4-Port electronic solenoid to control the two sides of the ALV40 actuator.
Is this just an External Wastegate?
No. The Turbosmart GenV External wastage architecture did make this product a reality – However, there is a small but essential difference between a wastegate and an ALV40: True Twin Port Control. The valve may be capable of handling exhaust gas temperatures; however, in an Anti-Lag application, you are passing much cooler, compressed air (rather than exhaust) as normal External wastegates do have much hotter exhaust gas. They run a relatively large tolerance on the valve guide. While this design feature is necessary on an external wastegate, we can engineer a much tighter seal on an Anti-Lag valve. This ensures much more accurate & higher levels of valve control.
Is this the same as throttle kick Anti-Lag?
Not at all, no. There are a couple of crucial differences, and yes, you require more hardware to do it. Throttle Kick style Anti-Lag has been a feature on most aftermarket ECUS for some time. Fresh Air Anti-Lag, however, has several distinct benefits. The first is significantly lower EGTs during Anti-Lag operation, which means more excellent reliability of your turbocharger, manifold and accessories. The other use is around vacuum-boosted brake systems. Vehicles fitted with these braking systems (most cars) will lose braking assist when kick-type Anti-Lag is activated as the engine does not run in a vacuum. A Fresh Air Anti-Lag system, however, does have a vacuum and maintains all vacuum bases & boosted accessories when in operation.