mario82686

Would installing an exhaust in your car hurt your gas mileage?

SuperCivic

under equal driving conditions, a high flowing aftermarket exhaust will yield slightly better gas mileage than a stock system.

I'll cut ya!

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by SuperCivic &raquo;</TD></TR><TR><TD CLASS="quote">under equal driving conditions, a high flowing aftermarket exhaust will yield slightly better gas mileage than a stock system. </TD></TR></TABLE>

This is wrong. An exhaust system will allow more air to flow through the engine. As a result, more fuel will be added to match the airflow, resulting in less MPG.

SuperCivic

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by I'll cut ya! &raquo;</TD></TR><TR><TD CLASS="quote">

This is wrong. An exhaust system will allow more air to flow through the engine. As a result, more fuel will be added to match the airflow, resulting in less MPG.</TD></TR></TABLE>

i personally experienced an increase in mpg when i put an aftermarket exhaust on my del sol. a pretty dramatic increase in mpg. people might claim a drop in mpg because they're more likely to drive the car hard. if i'm wrong i apologize...

Jonathan_ED3

I have ALWAYS recorded an increase in MPG after exhaust and intake. Especially on the highway.

I keep regular track of my MPG so I'm not just pulling this out of my crack.

mario82686

So intakes and exhausts give you better gas mileage.

Justin Jones

no, a free flowing exhaust is going to help mileage. kinda like the same principle that a K&N filter helps mileage... it's not about how much air is going through the engine... it's about how much work the engine has to do to push and pull that air.

mario82686

"The Kid", why did you start off with "no"?

willyboyK20

well i must need some tuning because i have ebay cai, dc 4-1 headers and a magnaflow cat back i my mileage is really bad for a civic, i used to get almost 300 mi/tank now I barely can get 250 mi/tank

SuperCivic

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by the kid 86 &raquo;</TD></TR><TR><TD CLASS="quote">no, a free flowing exhaust is going to help mileage. kinda like the same principle that a K&N filter helps mileage... it's not about how much air is going through the engine... it's about how much work the engine has to do to push and pull that air.</TD></TR></TABLE>

thanks, glad to see i'm not crazy.

i was sitting here trying to think as to why that guy said a free flowing exhaust would allow more air into the engine..

JimmyAtlantis

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by mario82686 &raquo;</TD></TR><TR><TD CLASS="quote">So intakes and exhausts give you better gas mileage.</TD></TR></TABLE>

Correct...the engine doesn't have to work as hard to produce the same amount of power over stock.