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Blacktree · 10-03-2022, 04:38 PM

Engines don't need exhaust backpressure. What they actually need is flow velocity, for exhaust scavenging. Closing off part of the exhaust during cylinder deactivation should help maintain flow velocity.

10-03-2022, 04:38 PM	#12 (permalink)
Blacktree Master EcoModder Join Date: Dec 2011 Location: Florida Posts: 258 The Prius Experiment - '07 Toyota Prius Base 90 day: 58.52 mpg (US) Thanks: 53 Thanked 167 Times in 110 Posts	Engines don't need exhaust backpressure. What they actually need is flow velocity, for exhaust scavenging. Closing off part of the exhaust during cylinder deactivation should help maintain flow velocity. __________________