With the IAT in the CAI, it is reading the colder air thus it's telling the PCM to richen up the fuel mixture to the injectors thus giving you more hp but at the same time causing a drop in your mpg. The size filter you have is good, no need to change it. Reseting the PCM will not be necessary. You have to decide which one you want, mpg or hp. If you want hp, leave the IAT where you have it now. If you want mpg, move the IAT back to the intake manifold. The PCM will make the adjustments on it's own.mimmo said:Yes the IAT is now on the CAI. Are you saying to leave the CAI in place but add a larger diameter filter to the end of it........................that would give me more and colder air wont it.......................can I reset my comp by disconnecting the battery ?
I see it as a "catch 22" kind of thing. Colder air = more HP due to the richer mixture. Warmer air = more MPG due to the leaner mixture. So I guess it really depends on a persons preference.MatrixMan said:x2 :tup: CAI is a good thing...
Cold air is DENSE air, this means there is MORE air per Square inch. With the additional air you need to add an appropriate amount of fuel.DangyLimited said:I dont know much about vehicles per se but i do have a commerical pilots lic and am currently working on my aviation mechanics lic, but we are told and do lean are mixture (amount of fuel) for recip (prop engines) as we get higher or if we operate in cold (or less dense air) so my question is why would you burn more gas if the air coming in is colder if it is less dense and requires less fuel in the fuel/air mixture? I am asking to expand my own knowledge wikipedia gets really deep into rich and lean subjects.
Thanks, i also cracked open one of my old flight books. The reason we lean our mixture is one to have better econ, but also because the air is less dense because pressure decrease as you go higher.AIR_RAM said:The PCM will only add more fuel at WOT... In all other part throttle positions your O2 sensors are used and will keep the AFR nailed to 14.75:1. At WOT the O2 Sensors are no longer used and this is when the colder air effects the amount of fuel.
At least I know this holds true to the (2002-UP) and only assume the same for later engines. It could be different for him but If I remember correctly his PCM is set up to do the same thing.
So his bad fuel economy are most like due to his foot position rather then his sensor location.
You need to remember that any time you increase the ability for your engine to consume more air... you also increase the engines ability to consume more fuel. Light throttle driving SHOULD yield better MPG's but your WOT will consume more fuel... This is why many people who add intakes see similar results... the first few days they tend to drive harder attempting to "FEEL" the new POWER... this in itself is bad for fuel economey.
Cold air is DENSE air, this means there is MORE air per Square inch. With the additional air you need to add an appropriate amount of fuel.
I don't see why they would LEAN out for cold air... Unless they are intentionally running on the RICH side for take off. I have heard of Pilots leaning out the AFR to gain better fuel economey though.
SPEED SAFE, AIR RAM