Ok here it goes.
Right now my best Dyno #'s are with fuel tuned to 38-46psi (idle to WOT).
I am runnign at 4Degrees advanced timing.
When I did the dyno run, I was getting around 12:1 a/f mix and by reducing FP to 38psi (from 42) and getting 14:1 a/f mix, I gained 21HP/32TRQ.

I used to run 8Degrees without detonation before the headers/new exhaust and colder les shumid weather, but got some knock last month at WOT and went down to my current 4Degrees.

I was told if I raise my timing to 6Degrees adv. and raise the Fuel Pressure a few PSI I should gain some power back, maybe 10-15HP.

Could this be correct?

 

Mmmmmmmm. possibly. It's always a try-it-and-see thing when you get down to the short strokes with tuning.

Wondering- from 12:1 to 14:1 A/F rtio with just a 4 PSI fule presure change sounds huge. Maybe 1/2 a point, but 2 full points sounds wrong. You sure you're comparing apples-to-apples?

Always set fuel pressure with the vacuum regulator line unplugged. Manifold vacuum (which varies with operating conditions) affects fuel pressure via the regulator. Always set it with the line unplugged and refer to your fuel pressure in duscussions like this with the line unplugged. Quoting fuel pressure with the line connected is confusing for everyone.

 

Ohh sorry I thought people would understand when I said 38-46psi (idle to WOT). Usually WOT=AFPR disconnected from manifold vacuum.

I adjusted my AFPR from 48psi (with no vacuum connected) to 44psi, and it brought my A/F from 13.2 - 12.5.

I checked the Dyno graphs just a few minutes ago. I was off by a little bit.

So the 4psi gained me back to 14.2-13.9.