Z1 725 turbos posted by wthreez 2+2 TT on December 06, 2008 at 11:26 PM
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I'm in the same boat as you with finally breaking the engine in. I have a fully built stage 5 IPP longblock with all the goodies (manifolds, 500 cams, 3" exhaust) and these turbos do hit pretty hard. I'm just running off the wastegates and 15psi is what mine are set at and I reach full boost around 4400 rpm. To be honest i was expecting a little more when i fully floored it but i'm still not tuned. I think these turbos will really hit once its tuned and i turn the boost up to 20psi. I guess 15 psi is "baby boost" for these turbos and they are barely coming alive at that boost. Good luck with your setup.