Hey Trekkor,
With my 2.7 I used the 7500 RPM pill the first season then ended up buying the 100 RPM selector switch for it. I would run 7200 RPM as a safe zone then dial it up to 7400 or 7500 depending upon the course if I wanted extra revs.
As us know my 2.7 wasn't stock
so the goodies inside let it rev to 7500 pretty safely. I ended up moving it down to 7200 the second year for engine life. I wanted to get 3 total years out of the motor before a tear down and everything was going to plan until I missed that shift at Buttonwillow...
I believe your 2.2 is not stock and will rev to the moon like mine did. I'm looking at my Porsche engine book and I see peak HP is:
125HP @ 5800 RPM
155HP @ 6200 RPM
180HP @ 6500 RPM
Peak torque is somewhere between 4200 to 5200 RPM. These are all stock numbers.
If memory serves the 2.2's and 2.4's had redlines at 7200 or 7300 RPM....
I think....
Hey JP, weren't you runnin' your 2.7 with a 7300 pill?
I hope that helps you get started....
Bill P.