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Message: [QUOTE="jdgleason, post: 93670, member: 166"] No, the larger turbo is for a larger VOLUME of air. Not pressure. A bigger volume of air= more power. Just adding more boost only works to a point. There is a point where a turbo leaves its optimal range in the compressor map. This means that at XXpsi, the turbo is running out of air to move. This is heating up the air that is going into the motor which isnt good either. So, a bigger turbo will move more air at the same psi. Think about this: Say you take air coming out of a stock charger- just for fun we will call it 500 cfm. All that means is the amount of air moved, in cubic feet, per minute. Say that this 500 cfm is entering the motor at 30 psi. Now, you change turbos and step up to a bigger one. Now, this turbo moves 900 cfm at 30 psi. See where the power gain is? Its in the volume of air (measured in cfm) not boost pressure. The larger atmosphere charger supplies extra air to the primary. So, the primary is making its normal amount of boost with more cfm. As for brian running 100psi, he has 2 large turbos, and they are set up for track purposes... He is moving an ungodly cfm at 100psi. Boost pressure should be a byproduct really, not a goal. In other words, he moves the air to make HUGE power, and his truck makes 100psi. There is a killer thread where Charles explains it prefectly. He is talking about a triple turbo setup, but the same principles apply here. [/QUOTE]

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