When it comes to Turbocharged engines, there is that one thing that comes associated with it, just like bread and butter — Turbo lag.
You might have experienced a short delay in power delivery when you floor a turbo car (predominantly a diesel) hard. This is the reason why some automotive enthusiasts prefer a naturally aspirated engine over a turbocharged engine.
Volvo PowerPulse prevents turbo lag. The patented system is present in Volvo’s D5 Diesel engine having two sequential turbos. It employs compressed air to spool (process of unloading the air from a turbo at high pressure) the turbo within no time.
Read the full Drivespark.com article.