What is a two-step rev limiter and how does it work?

two-step rev limiter

Those of you who have watched any form of drag racing where there are turbochargers involved surely have heard of two different types of engine equipment. There is anti lag and there are two-step rev limiters. Both of these are responsible for the massive exhaust flames that erupt from a car at the starting line. How do they work? What is the difference between the two?

Basically, it all comes down to ignition control. An aftermarket two-step rev limiter helps you set one lower limiter for launch. On the other hand, a higher limit is when you’re upshifting as you accelerate. Anti-lag is not that far away from it but it’s more focused on dumping fuel into the exhaust system. That way it can ignite further from the combustion chamber, thus helping the turbo build boost.

If you want a more in-depth explanation, check out the video below!