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<blockquote data-quote="lemosley01" data-source="post: 1825284" data-attributes="member: 17775"><p>Actually, there was no ownage intended. I just put that out there as both my thoughts on the subject and to open discussion to see what others who know more than me have to say on the subject. </p><p></p><p>Rex-racer, in theory, a CAI should not cause the car to run any more lean than when it had the stock airbox/filter on it. This is because the MAF knows the mass of the air that is being taken in, and therefore can calculate how much fuel to shoot into that air to make the proper a/f ratio. From the factory, I believe the cars are set to target something like 13.5(?) A/F at non-wot and at WOT it does seem to run into the 10s, although the WOT tables are derived from the input received during normal closed loop driving (when the oxygen sensors are being used).</p><p></p><p>I believe that CAIs that cause the A/F to run more lean are doing so because the turbulence in the intake charge causes the MAF to misread how much air it is seeing, and therefore not enough fuel gets injected. </p><p></p><p>One of the reasons our cars feel stronger when it's cold is that the PCM doesn't have to pull as much timing (if any) as when it's hot to prevent detonation. That 40+ degree difference (85 vs 45 degress) can make a lot of difference in how soon the fuel ignites. When it's hot, the fuel is more likely to pre-ignite, and therefore the computer will pull timing to prevent this (or when it senses detonation).</p></blockquote><p></p>
[QUOTE="lemosley01, post: 1825284, member: 17775"] Actually, there was no ownage intended. I just put that out there as both my thoughts on the subject and to open discussion to see what others who know more than me have to say on the subject. Rex-racer, in theory, a CAI should not cause the car to run any more lean than when it had the stock airbox/filter on it. This is because the MAF knows the mass of the air that is being taken in, and therefore can calculate how much fuel to shoot into that air to make the proper a/f ratio. From the factory, I believe the cars are set to target something like 13.5(?) A/F at non-wot and at WOT it does seem to run into the 10s, although the WOT tables are derived from the input received during normal closed loop driving (when the oxygen sensors are being used). I believe that CAIs that cause the A/F to run more lean are doing so because the turbulence in the intake charge causes the MAF to misread how much air it is seeing, and therefore not enough fuel gets injected. One of the reasons our cars feel stronger when it's cold is that the PCM doesn't have to pull as much timing (if any) as when it's hot to prevent detonation. That 40+ degree difference (85 vs 45 degress) can make a lot of difference in how soon the fuel ignites. When it's hot, the fuel is more likely to pre-ignite, and therefore the computer will pull timing to prevent this (or when it senses detonation). [/QUOTE]
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