One of the main disadvantages of this entire system is that it pressurizes the turbocharger and all of its parts inside. As these components are continuously stressed and pressurized, the life of these parts is affected. Well, there is a variety of ways to add up to the performance of the vehicle. Adding extra fuel and the air is what we can do to achieve the desired results. The most misfiring system depends on the computer for better ignition maps and fuel, even when the throttle is shut down.
So, when the spark is lesser, and the fuel is rich, which can be attained by the proper air and fuel mixture, can be achieved better performance without producing more combustion. While some systems depend on the computer, others rely on the combination of different valves, pipes, and vacuums for better performance. Anti lag system results in the best performance of the turbocharged vehicles. Hope this guide has explained in detail about the same.
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Say over a 20 kilometer special stage you could lose one to two seconds per kilometer. The solution was to find a way to eliminate turbo lag hence the name anti lag. There were a few primitive and semi effective methods of anti lag in the early days of turbo rally cars. Some were technical solutions and some were driving techniques. The most common was for the rally driver to keep their foot down to keep the revs and therefore the boost up!
It came about due to the advances in engine electronics and tuning. A specific set of conditions needs to be met for the anti-lag to work. The engine management senses that the throttle is closed and the engine is revving above 4, RPM so it runs the anti lag part of the map. What anti lag does is fire the injectors and the spark plugs on the exhaust stroke of each cylinder. The very rich fuel mixture is ignited however instead of producing power it actually exits the engine into the exhaust manifold creating a pressure wave.
The explosive nature of that somewhat external combustion keeps the turbocharger spinning at high rpm to maintain maximum boost.
The sensation of anti lag that we hear and see when watching a rally car is the back firing and the flames from the exhaust. You have maximum boost all the time and the throttle response is instantaneous. Anti lag is actually quite brutal. All of that backfiring can cause extra wear and damage to the rally car engine and turbo.
Turbochargers are manufactured to extremely fine tolerances and not designed for explosive pressure waves. Anti lag also produces intense heat. Therefore rally car engine; cooling, lubrication and induction intercooler systems all have to deal with that extra heat. This combustion provides the force necessary to keep the turbine spinning even when the engine is not creating significant exhaust flows.
As a result, the turbocharger is always spinning and generating a useful amount of boost, regardless of the amount of exhaust flow. The downside to this, as you might imagine, is that the combustion forces within the turbine housing apply a large amount of stress on turbocharger components and greatly reduce the life span of these expensive parts.
World Rally Championship WRC cars, for instance, generally replace their turbochargers after every race due to the destructive forces of anti-lag systems. These systems are easily recognizable by their backfiring sounds, somewhat similar to that of a gunshot as can be witnessed in the video below. There a few different methods of adding extra fuel and air into the turbine housing resulting in some variation in designs. Most anti-lag systems rely on a computer sometimes a standalone unit but often a function of the ECU which modifies fuel and ignition maps while the throttle is closed.
Making the air fuel-mixture richer more fuel and retarding the ignition less spark means some extra fuel will be pushed through the engine without combusting. When this unburned mixture reaches the turbocharger it will then combust, and result in the effects discussed above. In addition to the extra fuel required to create explosions within the turbocharger, some systems use different methods of piping air into the exhaust system. This can be done using a combination of pipes, valves, and the inherent vacuums created in some intake systems.
Anti-lag systems tremendously boost the performance of turbocharged vehicles, but because of the destructively high pressures and temperatures these systems create, you might want to consider another approach if you're on a tight budget. Content is for informational or entertainment purposes only and does not substitute for personal counsel or professional advice in business, financial, legal, or technical matters.
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