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Since you're running Z1 Stage II turbos (which, being larger than stock, will have a slightly colder/more efficient charge than stock turbos), I wouldn't go over 20 or 21 psi. Just to be safe, I'd have some 100+ octane fuel just to make sure that isn't too much for the intercoolers, but I honestly don't think 20 or 21 psi will detonate on stock turbos with those intercoolers. For reference, I would say 18 psi is the limit with stock turbos and stock intercoolers. Also, between runs on the dyno, give the intercoolers PLENTY of time to cool off. I showed a 16rwtq drop off between two runs with no parameters on the engine altered just because the intercoolers were heatsoaked (yes, we had fans blowing on them). Perhaps get a can of compressed air (keyboard cleaner or some other aerosol can) and spray it at the IC's upside down between runs (yes, I know it's technically probably illegal and potentially harmful to the ozone layer, but I don't think a few seconds of it is going to make the difference between us dying of skin cancer or the ozone layer protecting us through the remainder of OUR lives...)
FWIW, I ran 20psi on my GT2530's with stock intercoolers and 110 octane fuel (like I said, just to be safe)... no hint of detonation.
==========Sig Begins Here========== my favorite reason for a post being deleted:
Private Message from the Admins or Moderators
The moderation staff has deleted your message uh oh... I'm gonna put my flame suit on posted on 09/19/2004 at 12:17 AM in the General forum for the following reason: be nice to the newbie
"That's what you get living in ghetto Oak Lawn. (n/m)" - ANDY J 02:35:30 11/13/03
"he has the green orb of immunity :( (n/m)" - Spee 18:52:43 11/16/03 "we're anal like that. =) (n/m)" - ZEngineer 12:47:56 02/10/04 
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