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Old 10-06-2013, 11:16 AM   #9
pokeybritches
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Join Date: Jun 2012
Location: Gulf Coast
Posts: 58
My Ride: G-Power Z4M, VF Z4
You can upgrade it with a smaller pulley, but just know that it will void whatever warranty VF gives you. I haven't measured yet, but I don't think the pulley is a standard Vortech pulley, so you'll need someone to make one for you. You'll need a tune too, which is the hardest part. I see no issue with bumping it up to 8 psi, especially with water/meth and a good tune. Some people run around at 8.5 psi with no intercooler on ESS Stage 1 twin screw setups with the TS2+ pulley, and those setups should be more prone to detonation because they boost the car more at peak torque.
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G Power Z4M and VF Engineering Z4 3.0i
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