What is turbo lag? It's the delay between when you open the throttle and when the turbo begins delivering boost—when the engine is above its boost threshold RPM. Some engines have nearly zero turbo lag, some have a ton. But there isn't an engine out there that can deliver an immediate hit of boost below its boost threshold RPM.
It's simply not possible. So the next time you blame a turbocharged vehicle's slow throttle response on turbo lag, think to yourself: Am I really experiencing lag, or is this a case of sitting below the boost threshold? Join Now. New Cars. Car Life. Type keyword s to search. Today's Top Stories. This content is created and maintained by a third party, and imported onto this page to help users provide their email addresses.
The automotive enthusiast community occasionally mixes and matches a few of its key terms. Wheels versus rims, for example. Another example can be found when dealing with engines that breathe through a bit of forced induction.
On a turbocharged engine, there are two physical concepts that can often confuse folks. In one corner we have boost threshold. In the other you'll find turbo lag. Jason Fenske from Engineering Explained is ready to set us straight on the meaning of each.
Let's start with boost threshold. That's the term to describe the engine speed required to produce enough exhaust gas flow that in turn generates the boost a turbo needs to start spinning and feeding air into the engine.
So it's a level of engine speed where the turbo has positive manifold pressure. It's almost like a changeover point for a VTEC engine. On the other side of the turbocharger discussion, you'll find turbo lag. This describes the amount of time between the point when the throttle is opened and the turbo spools up.
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