Phaser limiters or even lockouts are required if you install performance cams that have a high enough valve lift/opening duration that would otherwise cause piston to valve contact. Full VCT functionality ensures that the torque band is as wide as possible with optimum driveability. Once you restrict or eliminate VCT function, those characteristics are compromised. Usually it's the idle quality, low rpm torque, and low rpm driveability that suffer.
. . . . Once you restrict or eliminate VCT function, those characteristics are compromised. Usually it's the idle quality, low rpm torque, and low rpm driveability that suffer.
yep, that is the basic point as I understand it -- the stock cams use the variable cam timing to optimize performance over a broader RPM range; as soon as you start "locking out" or limiting the VCT function, you are moving the powerband away from that broad performance and toward performance that is focused on a specific RPM range, which is generally high RPM for high performance cams . . . in other words, generally, you lose low end torque
but if the lockouts are required for the cams that you chose, then you don't have any choice
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