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Home / Tech Center / Injector Sizing Calculator

Injector Sizing Calculator

Airflow-based duty cycle estimate for your combo. This is a planning tool, not a tune — for a build this serious, get it verified and dialed in by a real tuner. Book a session or call 928-706-6112.

Check a Specific Injector (optional)

Engine Parameters

VE guide: mild street cam ≈ 80–85%, aggressive street/strip ≈ 90–100%, drag race / heavily boosted ≈ 100–130%+.

Reference BSFC: 0.50–0.60 lb/hp/hr typical (NA to boosted). Not used in this calculation — shown for cross-checking against dyno numbers, since the math below is airflow-based, not BSFC-based.

Advanced settings

Total injectors = sum of all sets. All sets are treated as firing together and sharing the load evenly — this does not model a staged-injection kick-in point.

Minimum Injector Size Needed

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Duty Cycle vs RPM

Assumes VE and boost hold steady at your input values across this RPM range — not a dyno curve.

Matching Injectors In Stock

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