West Virginia Chapter Director /
MA Drag Race Team Coordinator
Join Date: Jul 2002
Location: Hedgesville, WV
I'd go with the 38 Nitrous 28 fuel jet. The best thing to do would be to get it on a dyno and start at those numbers to see what the AF's look like since you have little information.
If you can get a dyno set up with the car try the 26. Make sure you have a tune with a bit of Timing pulled out in either case. Stay with whatever jets they recommend and the bottle pressure they recommend. They do that for a reason. Each system is a little different. There should be estimated HP numbers there somewhere based on the jetting you are using.
I'd recommend an aftermarket Fuel pump and regulator before doing this.
Also, your fuel pressure should be around 40 PSI.
1996 Cougar XR7 Special Edition (Street & Strip)
"There's a bad, built NA 4.6L COMING Spring-Summer 2018"
Elite member of the Halfshaft snapping, Auburn eating, Tranny crunching, Piston Melting, Tire lifting, 500+ lb ft Torque Club.
Cougar ET-Stock 4.6 shortblock/Stock PI headswap Bullitt NA 12.94 @ 105+
Nitrous 11.75 @ 114 MPH
2008 Ford Powerstroke 6.4 TT F250 4X4 Supercrew: 12.82 @ 105 MPH
"IN MEMORY OF MY FRIENDS JOEL BENDER 1979-2006", JOHNNY LANGTON 1975-2011, and MICHAEL VIVERETTE 1953-2013"