Quote:
Originally Posted by turbo69bird
Remember when speaking to people about turbos that the terms boost threshold and turbo lag are many times used incorrectly.
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From MotorAuthority.com:
"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. You're already operating the engine at a point past the boost threshold though, so that is not a factor in the turbo lag equation. Instead, turbo lag can be related to engine tuning, intake design, backpressure, and the size of the turbocharger itself. A larger turbo simply takes longer to spool up and deliver more boost."
Is this correct?