Description
DIS-4 Plus HO digital ignitions are higher-output versions of the DIS ignition controls from MSD. They’re designed for full race engines running high boost pressures from turbos, blowers, or nitrous. Their increased output will light up fuel mixtures even under these extreme cylinder pressures. Your late model distributor-less ignition system will never be the same. The capacitive discharge ignitions feature multi-channel capability, complemented with multiple sparks, two rev limiters, and a timing control. These DIS ignitions are engineered with the latest in digital science, including power MOSFET technology and efficient IGBT coil drivers. They’re managed by a 15 MHz micro-controller for extremely fast compensations and decisions. In the end, this creates incredibly accurate spark delivery, rev limiting, and timing functions. Throttle response and mid-range pull are also improved, due to a series of powerful multiple sparks that last for 20 degrees of crankshaft rotation. There is a two-step rev limiter, which gives you one limit to set for hole-shots and another for top-end performance. For engines using nitrous or extremely high cylinder pressures, you can also program a high-speed retard after the engine hits total timing. Both of these features are easy to adjust with the new built-in rotary dials. They also feature an ignition interrupt that will prevent the engine from starting by disabling the output to the coil, a retard feature that retards the timing at the top end to prevent detonation, and an LED monitor that will alert you of a low supply of voltage or faulty input signals. Also, there is now a true step retard that can be activated through your nitrous solenoid wiring. The DIS-4 HO Plus digital ignitions are designed for 6 or 8-cylinder engines with three or four coil packs.
