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Billet Pro Shop — Tuning Tools
Injector End Angle Calculator
Pick your cam (or enter a custom cam card), set your fuel system, and get a Holley-ready Injector End Angle table across your full pulse-width and RPM range.
Cam Setup
Unconfirmed spec — running Gen 2 lobe timing as a placeholder until we get a confirmed cam card. Verify against your actual cam before tuning off this.
@ .050" lift
@ .050" lift
Where you're locking the intake cam
Where you're locking the exhaust cam. Card only gives LSA + one centerline? Exhaust = 2×LSA − intake.
Additional phaser trim on top of centerline
Fuel & Injector
Rail pressure differential across the injector (psi). On a 1:1 boost-referenced regulator, this is your base pressure.
ms
inches
How much port air velocity blends into transport delay once it overtakes fuel velocity
Port Velocity Estimate
cubic inches
in² at the flange/narrowest point. Typical Coyote PI port ≈ 2.0–2.2 in²; rectangle-port LS-style heads ≈ 2.8–2.9 in². Enter your actual port size if you know it.
PW Range
RPM Range
RPM →
Reading this table: pulse width (rows) is the commanded injector on-time in ms; RPM (columns) is engine speed. Each cell is the crank angle at which that injection event ends, in Holley's Injector End Angle convention. To use it, load it as an Injector End Angle Offset 2D table in Holley EFI (Advanced Tables), leave the base Injector End Angle at 0°, and let this table drive it directly.
Pasting into Holley: "Copy for Holley" copies values only — no headers. Before pasting, set Holley's own row breakpoints to 1–16ms and its column breakpoints to match the RPM values shown above the grid exactly (if you've extended Max RPM past 8000, those columns won't land on round numbers — match them precisely or the paste will land on the wrong cells).