Thanks for all the advice.
Redcoupe: I sent an email to Steve. I’m starting to think that I have another problem, that once fixed will allow my chip to work fine. I found this thread very helpful in addition to the one Emery suggested:
http://forums.pelicanparts.com/911-engine-rebuilding-forum/288564-dme-motronic-o2-sensor-questions.html?highlight=DME+O2
Emery: I checked for a vacuum leak using a can of carb cleaner and found none. I inspected the air filter and cleaned it. It did not appear clogged or damaged.
Overheating? I do not know what the cylinder head temp is reading (could be part of the problem), but the oil temp gauge is reading in the low normal range.
JohnJL: I did 3 runs--all with very similar results. Dyno Guy offered to do more runs, but I did not want to because (as you stated) fear of doing damage. I didn’t come prepared for tuning. If I did I would had put on the stock “flapper” mass flow sensor and seen if the Autothority MAF is the problem.
As for who built it? I’ll leave his name out of it for now. I do not want to give him bad press before he has a chance to fix it… but he is a very reputable builder, does lots of race cars, hill climb cars and has worked with people such as Alois Ruf. My plan is to take it back to him and ask some questions based on all of the Pelican’s advice.
AlfonsoR: Yes you are right the HP is not that bad. Assuming I was at 207 BHP when I started. The pistons should have brought me to 207 x 3.4/3.2 = 220 HP, then accounting for 15% drive train loss, it would bring me back to 187 RWHP, which is close to the 196 that I got. I just think with the cams, intake and headers, I would be closer to 220 RWHP. The guy did the run in 4th gear. Is that normal? So, to your point (and JohnJL “there is not bad dyno results”)… the problem is NOT the HP, but the mixture.
Lapkritis: Misfire? Would I hear it? It sounds great.
One other symptom, which might be related is that sometimes it will not idle and shifts to 2,000 RPMs (high idle?) and sometimes to 1,100 RPMs.
Bottom line: I’ll take it back and have them check the plugs, fuel pressure and cam/ignition timing.
Thanks for all your help. I’ll let you know what I figure out.
Tim