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2008-2013 Cadillac CTS Performance Mods Discussion, Cold air intake for 2012 CTS coupe? in Cadillac CTS Second Generation Forum - 2008-2013; Originally Posted by gohawks63 How can it physically remove restrictions? The ECM will adjust the air/fuel ratio depending on air ...
  1. #16
    CTSCHICK is offline Banned
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    Re: Cold air intake for 2012 CTS coupe?

    Quote Originally Posted by gohawks63 View Post
    How can it physically remove restrictions? The ECM will adjust the air/fuel ratio depending on air temp, engine temp and power needs
    He is saying that the cars PCM will make the necessary changes to benefit from the change or removal of the intake restriction.

  2. #17
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    gohawks63 is offline Cadillac Owners Connoisseur
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    Quote Originally Posted by CTSCHICK

    He is saying that the cars PCM will make the necessary changes to benefit from the change or removal of the intake restriction.
    That makes more sense, but will it really if you don't install a cold air intake that requires a tune to exploit the increased air volume? I know we discussed this often on the Mustang forums. The stock programming and Mass Airflow sensor is expecting a certain air volume to flow through the intake. More airflow will not necessarily improve performance, but less (I.e. from a dirty filter) will result in the PCM instructing the throttle body to adjust the air/fuel mixture to compensate.

    I know I installed a K&N CAI on my Mustang. The K&N units do not require a tune so with the CAI alone the HP improvements are really pretty negligible. Mostly a few HP, hardly something you would notice. Only when you add a tune do you see or should I say feel a difference.

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    CTSCHICK is offline Banned
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    Re: Cold air intake for 2012 CTS coupe?

    It is no different than GM using the same exact programming for the same car sold in different climates and elevations because the PCM is able to compensate for the better or for the worse.

    The Maf tables are not restricted it can can read an increase in air flow just as it can read a decrease in airflow as in with your dirty filter example.

  4. #19
    jprestridge is offline Cadillac Owners Member
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    Re: Cold air intake for 2012 CTS coupe?

    When you say you removed the silencer, are you referring the the enclosure covering the drop in K&N filter? Thanks, JP

  5. #20
    arw1510 is offline Cadillac Owners Enthusiast
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    Quote Originally Posted by jprestridge
    When you say you removed the silencer, are you referring the the enclosure covering the drop in K&N filter? Thanks, JP
    No. There's a resonator that sits horizontal to the ground and kind of looks like a snorkel. There is probably pics in the " how to intake silencer removal" thread
    D VADER likes this.

  6. #21
    Ramv is offline Cadillac Owners Fanatic
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    Early Mustangs used speed density which doesn't respond well to this type of mods. Later vehicles use MAF and can handle big changes, up to the point that they exceed the fuel injectors capability. A tune shouldn't be required unless major mods such as cams are installed. However a tune can often be beneficial on its own (or with small mods) as the tuning of stock vehicles tend to be conservative to avoid detonation on bad fuel or in extreme hot weather/traffic etc.

    If the stock system is a major restriction to power, a CAI can help, or if it truly pulls in cold air will keep power up during high under temperature conditions. For example my 8.1/auto will get intake temperatures to almost 200 F after thirty minutes of WOT in first gear. Power noticeably decreases due to reduced oxygen due to the lower density of air. The stock tuning also decreases timing (reducing power) as the intake temps increase.

  7. #22
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    gohawks63 is offline Cadillac Owners Connoisseur
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    Quote Originally Posted by Ramv
    Early Mustangs used speed density which doesn't respond well to this type of mods. Later vehicles use MAF and can handle big changes, up to the point that they exceed the fuel injectors capability. A tune shouldn't be required unless major mods such as cams are installed. However a tune can often be beneficial on its own (or with small mods) as the tuning of stock vehicles tend to be conservative to avoid detonation on bad fuel or in extreme hot weather/traffic etc.

    If the stock system is a major restriction to power, a CAI can help, or if it truly pulls in cold air will keep power up during high under temperature conditions. For example my 8.1/auto will get intake temperatures to almost 200 F after thirty minutes of WOT in first gear. Power noticeably decreases due to reduced oxygen due to the lower density of air. The stock tuning also decreases timing (reducing power) as the intake temps increase.
    Ours is a 2006. The tune definitely improved the performance.

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