Hey guys, I will give the first hand "feel" of Joe's car.
My first two sessions out, I felt that I was about 30 mph slower just due to me not driving the car like I stole it. In the after noon for about 4 laps I drove it at about 8/10 and qas quick to realize that the car was down on power. I am thinking lean in the mid range about 4k-5200k....I was coming out of turn 11 and can drive all of 4th gear to turn one and never see about 5100 rpm. Sometimes, about 3 times, the car would come alive like someone kicked it in the butt. That was only if I kept my foot in it for periods of almost 15 secs or more. I really didn't want to blow anything up so I backed off. I mean it was getting to the point where stock 5 series bmws were catching my up hill on the track. The fuel pressure is reading 43 psi, which is after the fuel rail (return of fuel is done by the regulator, fuel rail is not a dead end point). I took the fuel filter apart and no junk in there. I am guess next step is to remove injectors and see if they are clogged. I don't think we will find anything because it would have made the car miss not just lack power. Like Joe said, we often play around about who's car is "slower" but for sure this 396 rwhp car is MUCH slower than my 388rwhp car. Maybe I can shoot a vid this week and we all can hear what I am talking about.
As far as the alternator dying....ha! I was on my way home from the track and then boom...no power. Had to drive 45 mins from where the car died to get the part and then back to fix it. I was about 2.5 hours from home and luckily my dad came up with tools the night before....brand new alternator from Adavance Auto $170..yay! That just makes up for the lack of gas I used on the track =)
Will report back as we figure this one out.