Your engine might be detonating? Causing the timeing to retard,then,, that will cause the boost to drop,having boost drop,,, that will give your boost reference less pressure to your FPR, that will cause your fuel pressure to drop.
On your data logs,can you see if it is pulling timeing @ 4200 RPM @85 MPH = 3rd gear)?? Top of second??? Just a thought.
Maybe your carb fuel filter is a restriction??? I am using a 10 micron filter before my pump & a 100 micron after the pump.
If you can run a 1.8-1.9 60 ft ,youll be running 13's. Get those Mickey thompson drag radials!!!!
My Stock 1997 extra cab 350 Silverado 4900 lb truck runs 2.3-2.4 60 ft times w/3:42 gears. @ 3000ft elevation track. It makes an advertized HP of 250
You really need to work on your 60 ft times to run 13's Two cents thrown :-)
