Injector Max Horsepower Capacity
The maximum power an injector set supports.
Example
You enter
- Injector static flow 31.25
- Flow unit lbh
- Number of injectors 8
- Maximum duty cycle (0-1) 0.8
- BSFC (lb/hp-h; 0.50 NA, 0.55-0.65 boost) 0.5
You get
- Maximum supported horsepower 400 hp
Details, formula, and sources
HP_max = injector lb/h x n_cyl x duty / BSFC. Eight 31.25 lb/h injectors at 80% duty and BSFC 0.50 support 400 hp; the SAME injectors on boost (BSFC 0.60) fall to 333 hp, why a richer tune caps power. Enter flow in lb/h or cc/min (lb/h x 10.5 = cc/min). 80% max duty avoids a lean fuel cut. Port injection, entered BSFC; not rail pressure or DI. A tuning aid; the measured fueling and the tuner govern.
inj_lbh = flow (or cc/min / 10.5); total_lbh = inj_lbh x n_cyl x duty; hp_max = total_lbh / BSFC.
The fuel-injector-sizing relation solved for the supported power, the inverse of the injector-size tile, a standard tuning-reference result, by name.
The injector-sizing relation and the BSFC ranges are public results in the engine-tuning references.
Estimate. AHJ and licensed professional govern.
Field names used by the API: inj_flow, flow_unit, n_cyl, duty, bsfc, hp_max
- Power capacity hp_max = injector lb/h x n_cyl x duty / BSFCengine-tuning practice
- BSFC ~0.50 naturally-aspirated gas, 0.55-0.65 boosted; entered by the usertuning references
- Conversion lb/h x 10.5 = cc/min for gasoline (SG ~0.72); 80% max dutyunit conversion