What Are Two-Step Rev Limiters? How Do Rev-Limiters Work?

Article Written by : Legendary Videos

If you have watched any form of drag racing where turbochargers are involved, you ...

If you have watched any form of drag racing where turbochargers are involved, you have heard talk of two different types of engine equipment: two-step rev limiters, anti-lag.

Both are responsible for some massive exhaust flames erupting from the car that’s revving at the starting line. But what is the difference between the two?

How do they work? And what do they do to help your racing launch and drag strip ET? And as always, Jason Fenske of YouTube’s Engineering Explained is here to demystify the technology that helps racers win. And with his trusty whiteboard illustrations, Fenske helps us understand the difference between the two-step rev limiter, anti-lag, and the launch control systems that some manufacturers now include from a factory on their high-performance cars.

Basically, it all boils down to ignition control. The aftermarket two-step rev limiter lets you set one (lower) limiter for the launch, and the higher limit for when you are upshifting as you accelerate away.

Anti-lag does something similar, and it’s focused on dumping fuel into the exhaust system, and it can ignite further downstream from the combustion chamber and help the turbo or turbos spool up to build boost. Want the more in-depth explanation? Here’s Fenske with the scoop.

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