What setting are you running?
My set up so far:

2002 Z28 auto trans,3.23 rear gears, Loudmouth exhaust,
SLP lid, 160*stat.

Looking for fan settings, a/f ratio, shift points,etc.

The predator will be here next week.

 

Sorry for the late reply. It's been a while since I posted on this board. At any rate...


For 160 Thermostat:

FAN 1 ON/OFF: 184/175
FAN 2 ON/OFF: 194/185

When monitoring real time data your o2 banks at WOT should read 890-910 preferred. However, if they read below 880, this will indicate a lean condition. If they go above 920, this will show a rich condition. Your Long term fuel trims should read 0 or slightly negative during cruise and settle in at 0 during WOT. If they happen to read positive during cruise, this means the pcm sees a lean condition and the positive Ltrims show the pcm is adding fuel to correct for it. If they are negative, the pcm sees a rich condition and will reduce fuel. The pcm always tries to target a 14.7:1 ratio at cruise. The pcm determines a/f at cruise based on the o2's. But during WOT it uses the fuel maps exclusively. Now, the problem with positive Ltrims at cruise is, if it sees a lean condition at cruise, it will assume a lean condition at WOT and add extra fuel based on what it saw at cruise. Don't be fooled if they still read 0 at WOT. That doesn't mean extra fuel isn't being added. So for example, if you set the Predator WOT PE at +2% with the cruise Ltrims still positive, it will add additional fuel to the 2% you are adding. But you'll never be sure just how much. This is why you want them to read 0 or just slightly below(-1% to -3%). This will ensure there is no extra fuel being added to any WOT PE adjustment you make. That is why it's important to keep an eye on your WOT o2's. If the cruise Ltrims are only +1% to +2% then you should be able to compensate by going negative on the PE provided your o2's are reading rich.
My Ltrims were anywhere from +1.56 to +5.47. I had to lean out the PE to 3% otherwise my o2's were too high. You can get a custom tune done to correct for positive Ltrims. I am getting this done now. That way you can tune for WOT properly and more accurately.
Positive Ltrims are usually NOT caused by the Predator. They are usually a result of an air flow mod. (lid, filter ,ported TB, etc.).
If your Ltrims are 0 or not really that positive (+1% or +2%), and you o2's are in line (890-910 preferred), then you can start increasing spark until you see KR, then back off a bit( I wouldn't go any higher than 30* advance during WOT).
If the Ltrims are consistantly above 2% during cruise, I would then suggest getting a custom tune to bring them down.
As for shift points. I have all my shift time settings at -15%. You could go the full -25% and it shouldn't hurt anything. My shift pressure is at +15% for all gears. Again, you would be fine at the full 25%. I have the shift rpm set at 1/2 6050 rpm, 2/3 6030 rpm, 3/4 6000 rpm. My shift mph and all other settings I left alone.