Scott, did you do the dyno runs at the Round up? I heard there were a lot of guys who were brought back down to earth after they saw what their actual horsepower was, not what they were telling everybody what they thought they had.
No they didn't attempt any adjustments, it was just to see what the numbers were.. Any guesses on the spikes in the graph? He said fuel or ignition..I have had an issue with my fuel regulator fluctuating a few pounds..I am going to get it back on a dyno in a few days to try and figure it out. Also to finally determine if I will continue to run the edelbrock carb, or my Holley. What carb are you using? And how is it jetted? Nice web site by the way!
My first couple of runs looked like your also, I was getting wheels spin on the rollors. It's really something watching your car do a burnout in 4th gear while standing next to it.
Once the tires heated up and the operator cranked down on the retaining straps the chart cleaned up. If your not getting wheel spin, it really hard to say what the problem is, could be lean, or timing could be bouncing around a bit. I run a holley 650dp and a can't rember what the jetting was, I know
I had the jetting all screwed up. I thought it was running pretty
good. I know we went 10 jet sizes down on the secondaries, because my wide open air fuel ratio was like 7-1 (slightly rich) If you going back for tuning I would invest in a oxygen sensor bung, have it welded into your header collector. The dyno operator can use the wide band O2
sensor to help with tuning. If they don't have a wide band, I would pick another dyno. They set my timing while the car was running on the dyno, wide open twisting the distributor, watching the numbers rise and fall. My car liked 36 degrees total timing.