he had an Si too, but i didn't ask what kind of intake he had.

what are your thoughts?

all else being equal, will you get any sort of significant gas mileage increase?

Thanks

 

Wasn't there already a thread on this? Is that where your getting this rumor from?

Anyhow...aftermarket intakes don't improve gas mileage. They allow for increased airflow into the engine. The computer compensates by adding fuel to maintain the appropriate Air/Fuel mixture to avoid damaging the motor.

I believe that's how it works. Did I miss anything?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by RICO_ &raquo;</TD></TR><TR><TD CLASS="quote">

Anyhow...aftermarket intakes don't improve gas mileage. They allow for increased airflow into the engine. The computer compensates by adding fuel to maintain the appropriate Air/Fuel mixture to avoid damaging the motor.
</TD></TR></TABLE>

Very true, but I do believe CAI, just like exhaust increases MPG by reducing pumping losses. The car works more efficiently by drawing air through a more free filter element, much like breathing through a straw, take the straw away and you don't work as hard.

 

i'd have to disagree with you RICO_.

stock intake systems are very restrictive to meet government standards and a general standard of a nice quiet ride. adding a CAI might, it may not though, increase your mpg by allowing your car to "breathe" better, making it more efficient. but this increase can be very small...maybe like 1-2 mpgs

i have seen nothing but gains from adding intake/exhaust and even headers. on my old car i went from 21mpg to 25mpg with intake/headers/exhaust.

 

Wouldn't the car run lean? Adding more air without more fuel.

While I haven't taken any mileage estimates with just the intake...i've noticed that my mileage has gone down slightly with the addition of my RH.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by RICO_ &raquo;</TD></TR><TR><TD CLASS="quote">aftermarket intakes don't improve gas mileage.</TD></TR></TABLE>

Rico you better inform AEM and K&N before the FTC gets them.

AEM's Claim

K&N's claim

Anothe K&N Claim

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by RICO_ &raquo;</TD></TR><TR><TD CLASS="quote">Wouldn't the car run lean? Adding more air without more fuel.</TD></TR></TABLE>

The computer can adjust spark timing instead of adding more fuel.

 

Well all three of those links mention the fact that changing out a DIRTY air filter can improve gas mileage. What about switching from a brand new clean stock air filter to an aftermarket intake? Two different things.

Correct me if im wrong but it almost sounds to me like those sites are saying that their intake systems help to better MAINTAIN gas mileage rather than actually improving it

 

I have to agree with RICO on this one. but my buddy has proven that his car got better gas milage. 06 tc with RH/I/E/pully and some other little things. he gets an average of 33mpg.

 

I think it depends a lot on the car. If the stock intake is very restrictive, you'd probably see a benefit if you DON'T CHANGE DRIVING PATTERNS.

I think a lot of people change their habits with mods because of the extra power and sound and lose whatever gains they'd experience.

I think you would only see a roughly 1 mpg difference or so anyway (even with 5% better mpg!) so you might not even notice it because of the changing conditions you drive your car daily in.

 

Well if replacing a dirty air filter restores your basline fuel economy wouldn't be within reason to say that replcaing a stock one with a less restrictive unit would increase your baseline fuel economy?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Kidnkorner &raquo;</TD></TR><TR><TD CLASS="quote">Well if replacing a dirty air filter restores your basline fuel economy wouldn't be within reason to say that replcaing a stock one with a less restrictive unit would increase your baseline fuel economy?</TD></TR></TABLE>

I guess it's subjective to the vehicle. Given that none of the websites claim an actual increase in MPG, that would lead me to believe that some vehicles MIGHT experience a slight increase while others would not depending on how restrictive the stock air filter is.

 

my brothers friend did I/h/e on his g35 and from what he told me its gulps down gas.

but im sure with all this extra power he isn't driving it easy either.

 

[QUOTE=accordselux]I think it depends a lot on the car. If the stock intake is very restrictive, you'd probably see a benefit if you DON'T CHANGE DRIVING PATTERNS.

I think a lot of people change their habits with mods because of the extra power and sound and lose whatever gains they'd experience.
QUOTE]

x 100

Although the guy at Injen told me their CAIs may run rich on the 08 SIs. Is that bad? I dunno what "rich" means, guessing it will consume more gas than usual

 

f-ed up the quote somehow. no burns, you get the point