Injector Dynamics info on lowest pulse width for their monster 1750cc/167lb on gas.
Key Low-Pulse-Width Performance for ID1750-XDS
Linear Operating Range: The ID1750-XDS maintains linearity within 2% down to approximately 2.0 ms effective pulse width. This means fuel delivery is proportional and predictable from 2.0 ms up to the upper nonlinear range (typically above 15-20 ms, depending on duty cycle and RPM).
Predictable Response Extension:
Due to Injector Dynamics' XDS (eXtended Dynamic Slope) technology, the injector provides usable, consistent response down to about 1.5 ms. Below this, flow variability increases, but it is still better balanced cylinder-to-cylinder than standard injectors of similar size. This improvement in low-end linearity supports better idle quality and drivability for high-horsepower builds (e.g., 150-190 hp per injector on E85 or gasoline).