dude seriously calm down ok?...and yes it does decrease ur mpg simply because the ECU has to compensate for the extra air and therefore puts forth more fuel...so yes regardless of if u floor it or not...its going to decrease may not be as much if u dont floor it true...but its going to decrease...wether it be by 3% or 15% either way its decreasing.......SRI possible none to a few mpg more.....i dont have to experience that just to kno it sir...thats basic engine knowledge....

 

dude calm down. funny because ive seen an increase in my mpg since i but mine on... so have 90% of other people. but then again you are the master.

 

i am calm im just saying....just research what ECU means and itll tell u...i mean im sure there are more factors that come into play like filter and what not....also driving conditions probably the biggest one...but the ECU still compensates...now you have better air yes of course that could possibly increase it but....normally it doesnt...

~~~For an engine with fuel injection, an ECU will determine the quantity of fuel to inject based on a number of parameters. If the throttle pedal is pressed further down, this will open the throttle body and allow more air to be pulled into the engine. The ECU will inject more fuel according to how much air is passing into the engine.~~~

 

Better flow, less resistance, and name brand intakes are actually tuned.

They increase gas mileage. That is why you gain horsepower...b/c you are lessening resistance. Resistance kills hp. The ECU will compensate for the intake as long as you reset it.

 

exactly...so not most people go and reset the ECU correct?...yes many do...but not majority...because thats normally what they get when first starting out. but what puzzles me is...i understand the increase in HP but how do you gain mpg from more dense air in the chamber that i dont get...i could understand warmer air thus less fuel but the cold air more dense ....i unno can u explain plz?

 

It doesnt have to be reset. It will still recognize the change otherwise there would be no point for a computer in a car if it couldn't handle a change. It just helps even more when the ecu is completely reset. It isn't so extreme for intakes b/c the gains are so small.

It isn't so much the air temperature as it is the volume of air and free flow. sri's and cai's basically get the air from the same place.

 

thats what im saying like...the volume is pretty much the product of temp right?...seeing as how more air particles are in cooler air than warmer air correct?....mathmatically no its not the prodcut of temp but it might as well be huh?...and technically since they get it from the same place but one is cooler therefore more dense and the volume is greater shouldnt it count for somethin?...or are you sayin the volume of the intake not the air?

 

Long post.. but should be helpful..

gasoline engines are VERY inefficient.. most of their energy gets wasted to heat loss or unburned fuel..

Gasoline itself is not a very efficient fuel, it has to be atomized to burn completely.. fuel injectors do a pretty good job of atomizing the fuel and allowing it to burn more completely, but the basics of it are this: larger gasoline particles, don't burn as fast or may not have a chance to burn at all under certain conditions... smaller particles ignite faster and burn better.. so basically the smaller the particles the better..

Air plays a large factor in the combustion chamber for many reasons.. typical atmospheric air is about 20% oxygen, now you suck that air in through a heated tube with lots of bends and/or imperfections.. and you are adding significant resistance to that air which is a performance killer..

so the smaller particles created by fuel injectors may not get enough oxygen to burn efficiently even if the injectors do a good job at atomization...

Oxygen causes a more rapid burning.. an oxygen enriched environment promotes faster ignition, quicker burning and more power overall.. it takes less time to make the same power out of the given fuel than a less enriched environment..


a CAI is designed to allow cooler, denser air to be taken into the engine, combined with their smooth flow tubes to minimize air restriction.. they gain power and response because they are essentially allowing more oxygen to be pulled into the cylinders per a given volume of air..


lets get hypothetical now for understanding purposes

Now lets say you have 200ml of warm air in a container.. and 200ml of colder air in another container. theoretically the colder air which contains more particles per given volume because of it being denser will contain more oxygen than the warmer air.. the denser the air the more chances of you pulling that 20% of oxygen in with it. as the air gets warm and expands.. combined with the amount of time the cylinder actually is intaking the air the less chance you have of getting the most oxygen possible into your combustion chamber... by cooling the air it allows that time window (which is milliseconds) to pull a denser air mix containing more oxygen into the cylinder..


now we all know that oxygen is an essential component to efficient combustion.. that's how Nitrous Oxide works.. N2O is approximately 40% oxygen from what i remember.. so you're gaining power by adding more oxygen to the mixture and allowing a hotter, more rapid, and thus more powerful combustion to take place.


so now apply all the factors of a CAI.. colder air.. Check... more flow.. Check... less resistance... Check.. essentially by decreasing air temperature and restrictions, and increasing the overall flow(the tube diameter plus air filter minus restrictions gives you this) you're increasing the amount of readily available oxygen to the engine by allowing the intake to pull more in with the same stroke length.


Therefor you should be able to make the same amount of power as before with LESS fuel because it's getting used more efficiently, thus if the computer keeps the fuel amount the same and the air/oxygen content is increased.. you GAIN power, response, and performance because that original amount of fuel is allowed to burn more completely during that same period which produces more power..

so the MPG gain is entirely possible if you add a CAI and drive conservatively.. most people see a "decrease" in gas mileage because the newly discovered power and/or sound leads to their brain telling their foot to push the pedal harder more often.. lol


make sense?


~Moddage

 

hmmm....very intersting
well unfortunately I don't have enough money to purchase SRI nor CAI
so I just remove the black air box in front of the passenger side (behind the bumper of course)
so it's just a bootlegged SRI lol at least I don't have to worrk about heat soak
(I don't see much difference yet it has only been a week)

 

you know you can get a cheap one off ebay, and just replace the cone with a k &n