Fuel Economy, Hypermiling, EcoModding News and Forum - EcoModder.com - View Single Post - high flow exhaust = 3-5% mpg gain?

comptiger5000 · 04-26-2011, 02:39 PM

I'd be surprised if the silencer makes any noticeable difference on vs off. Backpressure isn't the key (unless it's excessive), fast, linear flow is what matters.

There are calculations that can be done to find the optimal header size and length, optimal pipe size, etc. Autolounge.net | Tech | Exhaust

04-26-2011, 02:39 PM	#9 (permalink)
comptiger5000 Master EcoModder Join Date: Feb 2010 Location: CT, USA Posts: 544 RaceJeep - '98 Jeep Grand Cherokee (ZJ) 5.9 Limited 90 day: 13.62 mpg (US) Thanks: 1 Thanked 26 Times in 23 Posts	I'd be surprised if the silencer makes any noticeable difference on vs off. Backpressure isn't the key (unless it's excessive), fast, linear flow is what matters. There are calculations that can be done to find the optimal header size and length, optimal pipe size, etc. Autolounge.net \| Tech \| Exhaust __________________ Call me crazy, but I actually try for mpg with this Jeep: Typical driving: Back in Rochester for school, driving is 60 - 70% city