220-230 should really have no affect on the car. Once you start hitting like 260+ then your gonna feel it. You may also just be getting used to the power you added. But you should consider an oil cooler it is like stated above one of the best mods you can do to the z.
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2010 Base+Sport 6spd: Stillen G3, FI Non-Resonated CBE, FI Non-Resonated Test Pipes, UpRev Tuned, Custom 24R Oil Cooler, JDM Rear Fog-OEM Harness.
???Whp ???WTQ (Will find out come spring time)
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