Yeah I was on 93 octane. And my forth gear pull did hit 589whp but I'm pretty sure it was less then 9.5 psi. I don't remember. If anything it was at 9.3-9.5 psi.
I wouldn't think z1s dyno reads that much higher. I've seen a lot of single turbo and twin turbo guys on dyno days at z1, and they actually made less whp then where they had got thier car tuned at originally.
Then again there is a lot of variables that can determine the outcome at the time. I'm sure if I take my Z back in a few months the number will drop to average whp.
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