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The PCM has a boost limit that will cause it to go into a defueling mode. If you put a chip or tuner on, it's pretty easy to hit that overboost point. What boost foolers do is prevent the MAP sensor from ever seeing too much boost, and thus preventing an overboost situation with the PCM. Depending on your PCM, it will defuel when it sees either 22 psi or 24 psi.
The PCM has a boost limit that will cause it to go into a defueling mode. If you put a chip or tuner on, it's pretty easy to hit that overboost point. What boost foolers do is prevent the MAP sensor from ever seeing too much boost, and thus preventing an overboost situation with the PCM. Depending on your PCM, it will defuel when it sees either 22 psi or 24 psi.
This Hennessey Takes the Expedition Tremor's Off-Roading Capability to the Next Level
Slideshow: The VelociRaptor Expedition gains a lift, upgraded suspension, Brembo brakes, and trail-ready equipment while retaining the stock 440-horsepower EcoBoost V6.