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

Blu3Z3rg · 04-27-2011, 10:59 PM

Pipe Sizing Calculator
Use this for a VERY accurate calculation of your diameter size.

You don't need HP for fuel efficiency. You DO want a properly sized exhaust, with a SMOOTH flow in your exhaust.
Mandrel bends, straight flow mufflers, high-flow cats. THAT's what will give you the benefit.

For example, I had a turbocharged mustang that many people suggested I went with dual 3" exhaust. When I ran it through the calculator, I found that a SINGLE turbo with SINGLE 3" exhaust, would be enough to reach 600hp (remember, turbocharged changes the dynamics). I saw an increase in HP, AND I was getting 22 mpg if i could keep my foot out of the boost. All this and it was about 550hp.

04-27-2011, 10:59 PM	#28 (permalink)
Blu3Z3rg EcoModding Lurker Join Date: Mar 2011 Location: Indiana Posts: 62 2005 Dakota - '05 Dodge Dakota SLT 90 day: 15.26 mpg (US) Thanks: 1 Thanked 2 Times in 2 Posts	Pipe Sizing Calculator Use this for a VERY accurate calculation of your diameter size. You don't need HP for fuel efficiency. You DO want a properly sized exhaust, with a SMOOTH flow in your exhaust. Mandrel bends, straight flow mufflers, high-flow cats. THAT's what will give you the benefit. For example, I had a turbocharged mustang that many people suggested I went with dual 3" exhaust. When I ran it through the calculator, I found that a SINGLE turbo with SINGLE 3" exhaust, would be enough to reach 600hp (remember, turbocharged changes the dynamics). I saw an increase in HP, AND I was getting 22 mpg if i could keep my foot out of the boost. All this and it was about 550hp.