What type injector and impedance is the AiRSensors N-8A analog or F.I.R.S.T. digital ECU designed for?
The N-8A and its derivatives, (Superjection, N-8A-HD etc.) and the F.I.R.S.T digital ECUs each have four injector drivers, designed for low impedance units. Some modified N-8A ECUs had six or eight drivers installed. The majority of these “peak and hold” injectors we have encountered are of a Bosch design, the type used largely by Ford in their two-barrel throttle bodies (5-liter T-Birds, Mustangs, etc.) Typically, they measure 2-4 ohms. After pressing a barbed adapter onto the injectors, a high-pressure hose then top-fed fuel from a fuel rail. Several different flow rates were available: 36 lb. /hr, 46 lb. /hr, 52 lb. /hr, and 80 lb. /hr. have been seen in use. The fuel pressure regulators were set for either 39 or 55 psi. Though most low impedance drivers today are considered to be peak and hold designs, the AiRSensors analog units appear to be saturated, (while the digital units appear to be a modified peak and hold), when their current waveforms are examined! What all this means is
