I'd leave it at 40psi until you can get it on the dyno. There are just way too many factors to know the correct pressure without running an A/F ratio check.
I actually just got a chip for it this week...but I was running it for a bit without one. No dyno tune yet, but its in the works. I havent had any problems with it except at idle it would surge and sometimes stall, then naturally the hot starts would be almost impossible without holding down the gas. Other than that, I had no trouble as far as driveability was concerned. I just set the idle a little higher and it idled fine without stalling.
I actually just got a chip for it this week...but I was running it for a bit without one. No dyno tune yet, but its in the works. I havent had any problems with it except at idle it would surge and sometimes stall, then naturally the hot starts would be almost impossible without holding down the gas. Other than that, I had no trouble as far as driveability was concerned. I just set the idle a little higher and it idled fine without stalling.