What do you think? Do aftermarket intakes reduce gas mileage from stock?

In a 93 civic, and 94 integra when using air intakes the gas mileage has gone down. I was using brand new filters same ones used on your AEM, Injen, and other name brands. I had CAI, and short ram. No noticable HP gains, just reduced gas milage even when in combination with headers and exhaust.

 

Plain and simple no it wont hurt your gas milage

 

Since there is no fuel correction for the new intake, the little bit of added air wont change anything in the way of gas mileage. The main loss in MPG is due to people driving like jackasses since their cars are "faster" with the new CAI

 

Consider the more air per mile going thru.. just as a catback exhaust or even only a muffler provides. The more airflow the more gas is being pushed out the exhaust.

 

There are two flaws in that thinking.

1. If you're actually moving more air in and out of the engine, you're inherently making more power; therefore, less throttle (load) is needed to accelerate and hold constant speed....meaning no more fuel is used if acceleration is the same before and after the upgrades.
2. The ECU barely recognizes that more or less air is moving in or out of the engine since Hondas run a MAP rather than a MAF system...meaning, the ECU is not adding any more fuel for the extra incoming air.

 

if anything you should be gaining mpg

 

hmm idk anyone else?

 

i've actually heard the exact opposite, that aftermarket cai or sri's actually increase mpg. I don't see how it would decrease mpg in any way, but i have no hard evidence to back that up.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by dc2415 &raquo;</TD></TR><TR><TD CLASS="quote">i've actually heard the exact opposite, that aftermarket cai or sri's actually increase mpg. I don't see how it would decrease mpg in any way, but i have no hard evidence to back that up.</TD></TR></TABLE>

It will decrease you mpg because you will have the urge to hear the intake.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Steven. &raquo;</TD></TR><TR><TD CLASS="quote">
In a 93 civic, and 94 integra when using air intakes the gas mileage has gone down. </TD></TR></TABLE>
Where did you hear this load of ****?

 

Lmao, personal experience. Its never gone up. And no i didnt rev it to hear it so lmao on that.. im not saying im right or wrong but never did me any + mpg

 

well let me throw a little theroy in here:

the car is designed to run itself at a stoichiometric (sp) a/f ratio (14.7:1) by adding more air into the engine, the computer would try to maintain stoichiometric conditions by adding more fuel, trying to stay as close to 14.7:1. discuss.

(edit)

the way to make honda power (or any power for that matter) is to get more a/f into the combustion chambers, air is the main restriction (hence turbos and other fi) so to get more power you add more air, when more air is added, more fuel must be added to match.

more power = less mileage, no way around it.

 

I rather have the gas mileage then the no hp gain from an intake

 

Well then let me throw a little contradictory theory in there:
If you have a dirty air filter, you have less air flowing into the engine. As soon as you swap in a clean one, you have more air flow, but you also obtain better gas mileage. Put that in your pipe and smoke it.

 

just put the air filter on the throttle body if you dont use stock, probably best mpg right there

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Steven. &raquo;</TD></TR><TR><TD CLASS="quote">just put the air filter on the throttle body if you dont use stock, probably best mpg right there</TD></TR></TABLE>
ORLY? Proof?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Steven. &raquo;</TD></TR><TR><TD CLASS="quote">just put the air filter on the throttle body if you dont use stock, probably best mpg right there</TD></TR></TABLE>

You had a decent argument until you made this statement

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Schister66 &raquo;</TD></TR><TR><TD CLASS="quote">There are two flaws in that thinking.

1. If you're actually moving more air in and out of the engine, you're inherently making more power; therefore, less throttle (load) is needed to accelerate and hold constant speed....meaning no more fuel is used if acceleration is the same before and after the upgrades.
2. The ECU barely recognizes that more or less air is moving in or out of the engine since Hondas run a MAP rather than a MAF system...meaning, the ECU is not adding any more fuel for the extra incoming air. </TD></TR></TABLE>

This is what I believe as well.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Blahblah718293 &raquo;</TD></TR><TR><TD CLASS="quote">well let me throw a little theroy in here:

the car is designed to run itself at a stoichiometric (sp) a/f ratio (14.7:1) by adding more air into the engine, the computer would try to maintain stoichiometric conditions by adding more fuel, trying to stay as close to 14.7:1. discuss.

(edit)

the way to make honda power (or any power for that matter) is to get more a/f into the combustion chambers, air is the main restriction (hence turbos and other fi) so to get more power you add more air, when more air is added, more fuel must be added to match.

more power = less mileage, no way around it.</TD></TR></TABLE>


Well i look at this side of it, and was just having fun with MrHonda up there

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Schister66 &raquo;</TD></TR><TR><TD CLASS="quote">2. The ECU barely recognizes that more or less air is moving in or out of the engine since Hondas run a MAP rather than a MAF system...meaning, the ECU is not adding any more fuel for the extra incoming air. </TD></TR></TABLE>

regardless, the ecu uses the o2 sensor to alter the fuel trim. if it starts pumpin, and it sees more air is being pushed through, the o2 will read lean and it will adjust for more fuel.

now of course: in some circumstances, the o2 sensor is ignored. im not sure of the exact years, but i know a 91 goes into open loop (ignores o2) durring idle, and at WOT. for later years its still active at idle, but at WOT, the o2 is disregarded. for OBDII im pretty sure it takes o2 into account at all times.