My GTM Supercharger Review

Staples

No no... this is actually remarkable because the problem with the VVEL system from factory is that it has an extremely aggressive cam duration of about 300, yes 300. This in turn causes valve overlapping which means the intake valve and the exhaust valve are both open at the same time and when you're pushing a high amount of air - like with forced induction, you're actually not able to make the full amount of boost because it's being pushed through head so fast it doesn't give the bottom end enough time to compress it. Turn the cam duration down and in turn you'll be able to use more of the air that's being forced into the engine. That's why you see the same stage 1 kit on the 350z HR putting down 470+whp on 14psi, the same exact kit that's available to the VHR motor that is only seeing 8psi (same pulley being used between both motors)

This is what my input is at least on the matter, I'm sure Sam could shed a lot more light on this then I can.

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'08 Infiniti G37s - Forced Induction Fed