It really depends on the state of tune on your car. Some may be able to run 15psi and knock like crazy. Some 17psi and no knock. It really depends on too many factors to give you a definitive answer. I had a small 16G on my 1G Talon. I had a 2.5" exhaust from turbo to tip, stock IC. Everthing was ported. I ran between 15-17psi on pump gas (93 octane) with no problems. A good way to rough tune is with an A/F gauge and the BCS mod (well, if you have a 1G).
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