My numbers are reversed at WOT and idle though :?

I believe the negative symbol in that has something to do with the scan tool showing spark in crank degrees @TDC. So, since TDC = 0*, -27 = 27* BTDC, or 27* spark advance. Maybe that'* the beer talking though...

Just scanned my new GT for the first time.

I was seeing ~20 at idle and ~30 cruising, at WOT it was at ~24. So if your car is healthy than mine (prolly is) then your numbers look the be close.

What I had earlier are my GTP numbers .

-Jeremiah

Thanks for the confirmation of the numbers - they just seemed WAY off, but now at least I know my car'* not too crazy. Aeroforce should take note of the negative numbers on '97 Bonnevilles in addition to the GP'*.

Bob, I just looked over some of my old scan logs. My Auto Xray didn't do so well at logging data, but my timing numbers were very similar to yours. Seeing 18-20 degrees at WOT, and all the numbers were listed as negatives. When Intense tuned it they found no problems with the numbers they were seeing, and I forger if their HP Tuners software indicated positive or negative timing numbers. Whatever the case, rest assured that your car seems to be normal for a '97 L36 Bonnie.

97'* always list timing as negative, not sure why. N/A timing will always be higher than supercharged timing as well.

Edit* Trying to clean up, the workings of someone trying to repay a debt