Alan, here is a datalog from a 1/4 mile pass of mine in June. Hopefully you can read the small print.

I have a 62mm pulley, not tuned. Walbro 255 lph pump, 6an lines, regulator-less filter, adjustable fpr. The afpr is set at the factory pressure (58 psi). I have been watching the fuel trims and they are 1% and 3%, so I think I am going to turn up the afpr 1-2 psi. I would rather the ECU be pulling a little fuel than adding.

I only see 18 psi max boost at the top of 3rd gear. I have a very open exhaust, so I wonder if that accounts for the lower boost? The most I ever saw on the stock pulley was 14 psi.

I always see the 35* rise in IAT during the run, almost regardless of what the starting temp was. This run was "hot" with no ice in the ice tank, no fans or auxiliary cooling.

I also always see the dip in AFR between 5900 and 6100 RPM.

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