bumpypickle

iTrader: (1)

I just wanted to know if any of you guys with aftermarket exhaust systems gained a noticeable difference in mpg through normal driving conditions?

njmaxseltd

iTrader: (19)

No

D.Stillwell

Yeah, no. Only thing I gained was a few mpg less than stock.

ChrisMan287

iTrader: (34)

Nope.

Quickywd01

iTrader: (16)

deathwobble

iTrader: (1)

I got like 1mpg....maybe....when I keep my foot out of it.

bumpypickle

iTrader: (1)

Is that because you throttle it hard because you like the sound or did it actually just drop under normal conditions? (Steady highway speed)

D.Stillwell

Probably a little of both. But I remember seeing the drop after I finished all my mods. It wasn't necessarily the exhaust, just was the last thing I did. makes sense tho, more power = less mpg

You probably won't see any difference with just a catback exhaust, but if you do headers/ypipe, etc. you might see a small change

bumpypickle

iTrader: (1)

Yeah I thought the same thing but read online that theoretically with a better exhaust your supposed to get a few mpg gains. Just wanted to see if anyone had noticed any thanks.

deathwobble

iTrader: (1)

The engine is a bug air pump. The easier It can move the air and the more efficiently It can move the air the better it will work, I.E better MPG. But the gains you see depend on how inefficient the old system was/is. But manufacturers have gotten pretty good at making there stuff flow nicely. I see a upgraded exhaust as more of a fun sound/aid to other, future mods. But by itself you wont see much in the form of MPG or powere on newer cars

Turbobink

iTrader: (2)

None ...

But that wasn't why I installed it.

CMax03

iTrader: (3)

Yes! If you can stay off the gas for at least a week or you will notice a slight gain with a properly sized exhaust system....

Patm-a32

Lol not at all ^^ agreed i didnt install mine for better mpg

bumpypickle

iTrader: (1)

It's very clear to me that aftermarket exhausts are put on for the tone/slight raise in torque. I was simply asking if during any fuel up has anyone noticed a slight gain in their mpg because technically speaking there should be a slight gain. Thanks for your redundant post.

rexrodriguez

nope a better flowing exhaust will allow the engine to breather easier therefore more gas is used to compensate for the larger volume of air being moved

bumpypickle

iTrader: (1)

No it makes your engines existing power more efficient, there is no added power.

JvG

Possibly the people who install aftermarket exhaust systems also enjoy any extra power by pressing on the gas pedal harder.


Any gas savings from the exhaust is cancelled by having more fun.


Maximas are about performance, not economy. Buy a Versa or a Sentra if you want economy.

bumpypickle

iTrader: (1)

Yes I understand. But you can't constantly drop the pedal every time you drive it. I drive 100 miles here and back for work, so yeah of course I want to be a little more economic at highway speeds. 190 hp= high performance. I think not.

Turbobink

iTrader: (2)

... fail ...

deathwobble

iTrader: (1)

The volume of exhaust gas leaving the chamber has no effect of the amount of air/gas coming in to the chamber. That all is still restricted by fuel pump, injectors, air filter,air intake, and your foot.

bewrong

Better flowing exhaust allows more fresh air/gas into the combustion chamber, but he's still wrong for other reasons.

bumpypickle

iTrader: (1)

Yes we have already established this like 5 times. But thank you for posting it again

bewrong

Did you see the post directly above mine that claimed that exhaust efficiency had zero effect on intake of air/fuel?

rexrodriguez

lol how do i fail?

rexrodriguez

and i think its considered adding more power rather than making power more "efficient" since its not really there with the stock system

bumpypickle

iTrader: (1)

The engine produces power. The engine loses power through many components of the car, one being the restrictive oem exhaust. Replacing this exhaust with a more free flowing exhaust regains some of this lost power. How is this too hard for you too grasp?

bewrong

In that case, adding a turbo doesn't add power, either, just makes the existing components more efficient.

bumpypickle

iTrader: (1)

That is different, as well as unrelated to what we are talking about.

dwapenyi

iTrader: (3)

With a turbo, you are adding a a new component to the car.

In this exhaust scenario, you are replacing an existing component on the car with another one that does the job better.

D.Stillwell

LOL I like how this thread has progressed into a full blown argument...

Adding power vs. freeing up lost power = doesn't matter what you call it, your Maxi-pad is still slow

bumpypickle

iTrader: (1)

Well I'm just talking about mpg gains here not power gains..some people that don't know what they're talking about derailed my thread lol

bewrong

MPG gains and power gains are both efficiency gains, which is what results from an exhaust upgrade.

bumpypickle

iTrader: (1)

Correct why are you saying this? This has been brought up over and over.

bewrong

You, bumpypickle, have several times said otherwise.

bumpypickle

iTrader: (1)

Well just because you get a power gain on a mod doesn't mean it makes your car more efficient. In this case exhaust does, but doesn't add power it frees up lost power, the engine already makes.

CMax03

iTrader: (3)

Yes better MPG if you drive it moderately and Stay out of the throttle....I got performance exhaust and headers on almost everthing I own.....You don't have to press the gas hard at all to get the same result...If you can control your foot to stay in the highest vacuum point during operation you'll increase your gas mileage but die of boredom!