what will an exhaust system do for gas mileage?

Question

okay...so my fam has an suv, it's a toyota, so horsepower isn't like chevy or ford, so i'm looking for a way to improve power. i've heard an exhaust system will improve horsepower, but what will it do to the gas mileage?

Answer 1

from http://www.autoanything.com/savegas/

"You've probably wanted a sweet set of exhaust pipes for a while. Now here's a great excuse to grab a performance exhaust: these specially-engineered systems can improve gas mileage.

Exhuast systemsThe specialized mandrel-bending of an exhaust system frees your exhaust flow, virtually ending turbulent back pressure that can hold your vehicle much the way drag does. The average improvement to gas mileage is between 1 and 2 mpg, which varies by vehicle.

Along with the gas savings, a performance exhaust system for your vehicle boosts horsepower between 5% and 10%. Using this new power to drive like a bat out of Hades, though, will negate any gas mileage increase provided by a performance exhaust."

Answer 2

Well , it will improve horsepower right away, but also diminish engine torque. The torque is the capacity of the engine to spin form a standby. Torque is usually found and needed on the lower revs of the engine, where you spend most of the time driving at a normal pace. The final result of the new exhaust system is that you`ll get a faster SUV, that also needs more of the gas pedal to run at normal speeds and uphills. So More gas pedal equals les mileage per gallon.

Answer 3

quite some human beings have made a similar mistake and puzzled why their engine performed worse after the replace. The source has an fantastically sturdy rationalization of why you may assume poorer performance and gas performance with an stronger exhaust. What it boils all the way down to is you want the exhaust to be a similar length (which include a similar go-sectional section by ability of the passages of the catalytic converter) because the collector length. After the muffler you may go higher however it makes no enormous difference. earlier company ordinary gas monetary gadget criteria were presented in 1978 many manufacturers used substandard exhausts - even with the certainty that changed into most inexpensive. CAFE replaced the economics so even tiny advancements in gas monetary gadget were properly worth numerous R&D and diverse production fee. All cutting-part automobiles are engineered to provide the perfect gas monetary gadget they can get.

Answer 4

I have a Ford Explorer Sport Trac 4x4. It got 17 MPG average on my commute to work. I Installed a Gibson Cat back free flow system and a K and N free flow air filter system. I am now getting 20-21 MPG with a good kick in the pants for power. The price for both was under 500.00 and I am more than pleased.

Answer 5

yes, larger diameter pipes will allow the spend fume to pass more easily, resulting in a more effiicient engine.

A "cat-back" system will not do as much as an entire exhaust system because the catalytic converter is the most restrictive part, and the factory exhaust manifold (bolted right to the engine) is the 2nd most restrictive part.

It is possible to put on pipes that are "too big" resulting in expended gas cooling too much, becoming heavy while it is still in the pipes.

Answer 6

it adds up to 75-100 hp because most exhaust is restricted alot and it will add 1-3 miles to a gallon though if u have not that much power going through it u will lose hp and gas mileage
u dont put a dual on a v6 mustang without adding engine mods.

Answer 7

increase in horsepower will ultimately reduce mileage. increase in HP means most fuel is being burned in order to make that increase. exhaust simply evacuates the emissions faster therefore allowing more compression to occur or more gas to be burned

Answer 8

About the only improvement that improves both!!!!!!!!!!!!