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Let’s Get to Know the Anti Lag System on a Turbo Car

We may already be familiar with the anti lag system. In car videos that are scattered on social media, we certainly have never found a car with this modification. The sign? Surely the sound of an explosion from exhaust which is often accompanied by a fire!

In extreme engine specs, the sound of explosions and the fire is far more awesome. The sound of the explosion is very loud like an AK47 or machine gun! Often we see people around to cover their ears or even some who ran away because they thought there was gunfire haha.

For enthusiasts, this anti-lag system is exciting. Cool and amazed to see the car exhaust with a dashing flame with a thunderous sound. At car or car meet events , if we sometimes have a muffler contest. Out there, especially in America, anti-lag contests are often held.

Then is the anti-lag system just for style and exclamation?

Certainly not.

This system has a function that is very influential on the performance of a turbo car . Well, in this review, we will discuss the complete anti-lag system. Starting from the understanding, how to work, types / methods, and their advantages.

Let’s just start. Prepare the coffee hehe.

Turbo Lag

Previously we have discussed about turbo . This device allows a drastic increase in engine performance without having to enlarge or add engine cylinders. How? By compressing the supply of air that enters the engine. More oxygen, more fuel, as a result more power. That’s the brevity.

Well, even though this turbo is very patent in creating power, there are also disadvantages. The most highlighted is the lag.

Turbo is driven through exhaust gases. This makes the delay between when we press the accelerator and when the turbo turbine fan starts working. Of course this lag is something that is especially dangerous in the racing arena. When we release the gas pedal for example when entering the turn, so we will go back turbo will feel sluggish. Strength is not instant. Usually the new energy is felt after 2-4 seconds, depending on the size of the size of the snail.

Then how can we reduce this lag?

There are various ways, such as using two turbo (twin turbo) or also using a twincharger system that combines turbo with supercharger. However, both of these methods also have their respective weaknesses. There is also using driving techniques, such as left foot braking, where the gas pedal continues to be stepped on while braking. But yeah, this isn’t a machine modification hehe.

Another most effective and efficient way is to use an anti-lag system.

What is Anti Lag System?

As the name implies, anti-lag system can reduce lag drastically. The method is not as complicated or as expensive as twin-turbo and twincharger. As a result, lag in the turbo can be reduced and power can be produced more quickly.

Not only from the usefulness, anti lag system has side effects that are loved by enthusiasts. A loud explosion and fire from the exhaust! Surely this creates a fierce style and bringas haha.

Initially this technology was used in Formula 1 in the mid 1980s. Then, anti-lag is also applied to rally and drifting cars .


As mentioned earlier, the turbo works with the driving force of exhaust exhaust gases. When the gas pedal is released, the exhaust gas will be reduced, the turbo automatic will not spin optimally.

Well, in short the Anti Lag System allows the turbo to keep spinning even when the gas pedal is released.

How to do?

Have you ever noticed the sound of anti-lag explosion? the explosion occurred after the gas pedal was released / reduced. The explosion was not just trinkets. It is the explosion that drives the turbo to keep spinning and produce a constant boost. The explosion produced a boost which then turned the turbo turbine, so that even though the gas pedal was being released, the turbo still actively sent a boost.

Complete, we see in the type / method of anti-lag system below.

Type of Anti Lag System

Ignition Delay (Throttle Bypass / Throttle Kick)

This type of anti-lag system uses the retard timing method. This retard timing is short like this. Ideally, ignition occurs when the piston has risen to the top or after compressing air and gasoline. The compressed air and gasoline are then blown up by the spark plug, the piston is pushed down.

Now on retard timing, the ignition timing is slowed / delayed. So it is only when the piston goes down that it is blown up. This is done by tuning the ECU .

This then resulted in a portion of the explosion coming out towards the exhaust. The explosion that comes out of this course has a greater boost than the thrust of exhaust gases. This is capable of turning the turbo turbine more optimally when the accelerator is released.

Seconday Air Injection / Inlet Bypass

This method uses an additional air channel from the intake which is directed to the exhaust section to turn the turbo.

Turbo-compressed air naturally has a strong density and drive. Now, if the gas pedal is released, the amount of compressed air would certainly be reduced into the engine cylinder. Well, the unused compressed air will be flowed through additional channels (bypass) to the exhaust.

When we release / reduce the gas pedal, the air valve will decrease and of course the air entering the cylinder will be reduced. But the ECU will be tuned to keep ordering the same amount of gasoline spraying. The result is a comparison of gasoline levels greater than air.

When compressed and blown up, there is some gasoline that does not burn. The unburnt gasoline will then come out into the exhaust and join the air that was channeled via the bypass. Air with gasoline plus heat and pressure on the exhaust will then produce an explosion. The explosion is what then drives the turbo turbine to continue to spin and produce boost.

Turbo and Intercooler Bypass (D-Valve)

This method is similar to the Inlet Bypass, but the air bypass is located before the turbo and intercooler. So the air that is channeled into the exhaust is not the result of unused turbo compression air, but rather the air entering from the intake is directly channeled to the exhaust to drive the turbo turbine.

Strengths and weaknesses


  1. This modification is a relatively more effective and efficient way to reduce turbo lag. Compared to, for example, twin turbo or twincharger systems which are more complex and more expensive.
  2. The sound of an explosion accompanied by fire coming out of the exhaust makes the car feels exciting and attracts people’s attention.


  1. An explosion in the exhaust will produce a large amount of heat. This also makes the turbo overheat and reduces the life of the turbo.
  2. Blast on exhaust will produce a large pressure. In addition to reducing the life of the turbo, the exhaust manifold can break or crack.
  3. The sound of an explosion can indeed also be a weakness. Noise that is noisy for some people or some conditions is certainly not desirable.
  4. Although it rarely happens, the fire that comes out of the exhaust can be dangerous. Fire that is too extreme and can constantly burn the rear bumper of a car which certainly can spread also to other parts.
  5. Reducing engine braking.

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