The AIC1 is a laptop programmable additional injector controller that is available in several different versions. Options include internal absolute or gauge pressure sensors which are programmable up to 16 and 26 psi of boost respectively. Options are also available for low or high impedance injectors. Up to four injectors can be controlled. The AIC1 is programmed with the Split Second R4 engine management software.

The AIC1 is generally used with engines that have been converted to forced induction with the addition of turbochargers or superchargers. The AIC1 gives the user a convenient way to set the fuel mixture for proper air/fuel ratio in the boost region. The approach of running additional injectors is well suited for late model applications with Electronic Control Units (ECUs) that have very tight control over fuel mixture. The fuel system can operate completely stock in the vacuum region and the AIC1 can provide the additional fuel required in boost.

Additional injection schemes fall into one of two categories. In injector-per-cylinder or port injection there is an additional injector for each cylinder. This is recommended for high boost applications of 14 psi or more. The other scheme is upstream injection where the additional injectors are at the throttle body or in the intake tube.

In upstream injection applications, it is critical that the AIC1 is driven from a true tach signal. A true tach signal has a pulse for each cylinder ignition event. For example on a 6-cylinder engine the true tach signal will have 3 pulses per crank revolution. For optimum fuel distribution we recommend the 2-stroke engine setting. To get the correct RPM reading select one half the actual number of cylinders. For example when using a true tach on a 6-cylinder engine, use the 3-cylinder, 2-stroke setting. Any version of the AIC1 can be special ordered with the data acquisition option.