Hey, Jon -
Well this thread got me troubled. I have driven the car 3 times since Friday when I got the new CDI installed. I didn't notice anything bad but I thought maybe I was missing something. So tonight I backed the car out of the garage and closed the garage door. With the headlights on and the car running I rev'd the engine. With the car just 3-4 feet from the garage door I noticed the headlights brightened with the RPMs. I'm not sure I would've noticed it driving but it was definitely noticeable once I was looking for it. I do have the headlight relays installed.
Then I went for a quick drive. About halfway through I tried to turn the radio on and it wouldn't. I had wired it directly to the fuse panel with an inline fuse. Pulled the fuse and it was fine. Started the car again and this time the radio came on. Weird. I decided to check battery voltage:
12.61 off
13.78 idle
13.70 2k rpm
Checked fan belt and it seems fine.
I am thinking I might have a bad VR or bad ground somewhere. (Just because I can't find it doesn't mean it's not there.)
Just wanted you to know what I had found. Don't want you to fry your CDI if you can avoid it!
I'm running out of time to do more troubleshooting tonight. Have to leave tomorrow morning for a business trip this week so unfortunately I won't be any more help for a few days.
Hope this helps...
Edit: Check out the posted dated 01-27-2012 | 11:55 AM by user Perma-Tune in this thread:
http://forums.pelicanparts.com/porsche-911-technical-forum/653610-911-sc-no-start-perma-tune-question.html
I am on my phone so I can't see the post number. Looks like a good write-up.