MSD DIS-4 Series
MSD 62152 - DIS-4 Digital Ignition
The mid 1980’s was the beginning of the end for distributors in regard to new cars. The Buick Grand Nationals started using coil pack technology while many other GM vehicles were using dual tower coil packs sometimes known as Waste Spark systems. When Ford moved to the 4.6L Modular engine in the ’96 Mustang, there were two coil packs with four towers each set up as a Waste Spark. Other common applications came from Mitsubishi and eventually Chrysler systems.
MSD’s DIS Ignition Controls are designed for engines with coil pack, waste spark ignition systems. The DIS-2 has two channels, to fire two coil packs, while the DIS-4 is capable of firing up to four coil packs (or even for individual coils). Each Control delivers full power Capacitive Discharge sparks from idle through racing rpm. Below 3,000 rpm there is a series of multiple sparks that last for up to 20° to improve idle, starting and throttle response.
The adjustable features of the DIS Ignitions have also been upgraded with rotary dials. These provide easier, and more precise adjustments of the overrev limiter and the holeshot rev limit. Also, there is now a step retard that can be wired directly to a nitrous system or switch for activation!
OPERATING SPECIFICATIONS FOR MSD DIS IGNITIONS
Operating Voltage: 12-18 Volts Negative Ground
Current Draw: DIS-4 6.6A@10,000 rpm
RPM Range: 14,500 rpm with 14.4 volt supply
Spark Duration: 20° crankshaft rotation
Spark Energy: 105 - 115 milliJoules per spark
Weight and Size: DIS-4: 4.5 lbs, 9.5"Lx4.5"Wx2.2"H
Voltage Output Max: Primary: 460-480 volts delivered to coil
Secondary: 40,000+ volts (MSD HVC Coil)
MSD 62153 - DIS-4 HO High Output
Soft Touch REV Control: The DIS-2 and DIS-4 both feature an adjustable built-in Soft Touch Rev Control to protect the engine from overrev damage caused by missed shifts or broken driveline components. This feature produces a smooth rev-limiting action by randomly dropping one cylinder at a time and then refiring that cylinder on the next firing cycle. This feature is easily adjusted with simple program switches mounted on the side of the unit.
Two Step Module Selector: The Two Step function of the MSD Digital DIS Ignition allows you to activate a low rpm limit while staging and waiting for the light to turn green. This popular feature gives you a distinct advantage over your competition by permitting you to control your engine’s rpm precisely before every launch. With a fixed rpm limit at the starting line, each launch will be consistent and quick! The rpm limit is easy to adjust in 250 rpm increments with switches built into the side of the housing.
Programmable Timing Control: Precise timing control is essential to producing maximum engine power. With the addition of nitrous, turbos or supercharger systems, timing becomes even more critical. To get the most out of your engine, the ignition must be able to compensate for these extreme changes in cylinder pressure throughout the engine’s entire rpm range. During low speed operation, the MSD DIS Ignitions use the factory ignition to control basic timing functions. Once maximum timing is achieved, the DIS-2 and DIS-4 can be programmed to retard the timing at a specific rate and rpm point to prevent engine damage due to detonation caused by excessive timing.
LED Monitor: A built-in LED monitor is a useful tool to determine the status of the charging and ignition systems. When the battery voltage drops below 8 volts, the LED will begin flashing at a rate of two times per second, letting you know that the charging system is not operating properly or that the battery has failed. Also, if any of the ignition’s channels lose their trigger input, the LED will flash at a rate of one flash per second.
Ignition Interupt: To prevent accidental or unauthorized starting of the vehicle, the MSD DIS Ignition systems feature a driver activated ignition interrupt feature that can be used as an anti-theft device. When activated, this feature will prevent the engine from starting by disabling the ignition’s voltage output to the coil.
EMI Noise Protection: As with all MSD Ignition products, additional protection from Electro Magnetic Interference (EMI) has been added to the design of the DIS. Special circuitry filters out unwanted noise that commonly causes other aftermarket ignition systems to false trigger, operate intermittently and even fail.
Spark Energy: 170 milliJoules Per Spark
Primary Voltage: 470 Volts
Output Voltage: 43,000 Volts (Stock Coil)
Operating Voltage: 12-18 Volts, NEG. Ground
Current Draw: DIS-4 HO, 10 amps@10,000 rpm
RPM Range: 12,500 rpm w/14.4 Volt Supply
NOTE: Verbiage direct from MSD website.