NGKBP8ES gapped at 0.035".
L28 N42 at 20 psi, 435rwhp, intercooled, 100 octane unleaded, 18° initial, 35° total, retarded to 28° with MSD 6T, MSD helicoil wires, RC550's, analog ECU with hotwire mass air sensor. Cam is old Racer Brown turbo grind 226/246° at 0.050" lift. Arias, O-ring block 8:1 CR. Total seal second ring. Turbo is Turbonetics H3. Exhaust is 3" with Dynomax oval. Much chamber work with 3.5 cc removed to unshroud valves and polished. A/F estimated in 10's at boost.
New engine same, except added Swaintech coatings on piston domes and skirts. Not on dyno yet, since still breaking in at 12 psi on 93 octane. A/F in high 11's at boost.
Noticed poor idle since rebuild with RC inj, suspect pencil thin spray pattern prone to fouling. Will experiment with gap and report results.
Anyone called plug mfr for info on trends for gap vs A/F, CR and boost parameters?