You know yo are leading a good life when you can put the car on the dyno and replicate on track power issues.
Last week, finally got around to taking the Camaro over to Carolina Auto Masters for a little testing. When the car's temperature was under 200 degrees, it was making stupid power (240/307). But as the temps came up, there were serious power drops. These showed on the graph as sleep valleys. When the temp got around 220, the motor never recovered from a drop at 3400 RPM, dropping the power to 203/303.
The scanner showed that the computer was not pulling timing. A new coil showed no improvement. So by the process of elimination, the distributor became the main suspect.
I pulled the old one when I got home. Nothing was broken, but it did not rotate freely. When you spun the rotor, it felt notchy, almost clicking like. I could not remember doing that when I rebuilt it last year. Oh yes, I did actually rebuild it myself. So off to the Summit catalog for a new MSD distributor. Surprise, spin the rotor on the new one and it is smooth and silky. Plus it is all polished and adds some bling.
While I am at it, I will replace the water temp sensor for the computer just to be on the safe side. The car separate sensors for the gauge and the computer, go figure.
So it off to Summit on the 11th to try it out. Hopefully, this will address the power drop I have been feeling since June that came to a climax in August.
So I will not be adding distributor rebuilder to my resume any time soon
A special thanks to Jeff Creech and his boys for all the help, 75 minutes of dyno time and 14 plus pulls.
In case you are wondering, there is a reason the numbers stated don't match the three pulls on the chart

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Jim Pastorius
2008 Silverado VortecMax
1992 Camaro
CMC#92
2002 BMW R1150R
2009 3rd Place CMC Mid-Atlantic Championship
2009 CMC Hyperfest Winner