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MC-4 Digital Ignition


MSD engineers have taken the best of both worlds: Multiple Spark Discharge, and digital computer accuracy and put them into one compact ignition system. You'll be able to program the MC-4 at the track, on the dyno, wherever - with or without a computer! It's what you've been waiting for - the ability to program ignition timing curves to suit your engine's needs with the supplied Pro-Data Plus software. This ignition has every imaginable feature. You can configure the MC-4 for a 4, 5 or 6 speed transmission with a kill in all gears, a 1-2 auto, a 1-2-3 auto, or a full automatic no kill transmission. The kill time itself is adjustable from 20 to 99 milliseconds in 1 millisecond increments. The MC-4 can be programmed to either automatically shift or control a shift light for manual shifting. Shift points can be programmed separate for each gear. The MC-4 has three rev limiters. One engine protection over rev limiter, one launch rev limiter and one burnout rev limiter. You turbo guys will love the boost curve features of the MC-4. Retard features are many, like a launch retard ramp by time. Start out retarded from 1-15 degrees with the launch rev limiter on progressing to normal timing after 0-2.5 seconds. Three separate externally controlled retards, one is progressive to retard the timing on a ramp to coincide with a progressive nitrous controller. The MC-4 also features individual gear retards starting in 3rd gear from 0-15 degrees. An RPM window switch is also included to turn on and off any 12 VDC device at pre set rpms. The MC-4 is easy to wire and program with either a laptop or the optional hand held programmer. An optional shift light with remote launch rpm set module and gear indicator is also available.

  • For use with single or dual spark plugs per cylinder
  • 1,2, or 4 cylinder selectable
  • Computer interface for easy programming
  • Optional hand held programmer for quick changes
  • Optional handle bar mounted launch RPM Selector
  • Optional tester will test all options
  • 0-25 degree start retard
  • Mappable run timing curve
  • Launch Ramp Delay by time 0 - 2.5 seconds
  • Three step retards by RPM or switch
  • 0 - 2.50 Second step retard off delay for precise nitrous control
  • Progressive timing retard by time for progressive NOS
  • Launch Timing Curve to prevent tire slippage
  • Individual cylinder timing when optional cam sync sensor is used
  • Gear Retard - Retard a different amount for each gear
  • Shift Kill feature with programmable delays 20-99 milliseconds
  • Shift Kill Modes for Manual, Auto 1, 2 and Auto 1, 2, 3
  • Optional Boost Retard curve when used with an external MAP sensor for turbo applications (2 - 45 psi)
  • Built in RPM Activated Window Switch - Turn any device up to 3 amps on at any rpm then back off at a different RPM
  • Sequential Shift Light - Turn on an optional shift light at a different rpm for each gear
  • Sequential Shifter - turns any air shifter into a fully automatic shifter (3 amps max)
  • Tach Output wire for tachometers or data recorders
  • Monitor Mode for easy set up of three step switches


MC4 Digital Ignition Specifications:

  • Voltage input - 11 - 18 Volts
  • Current draw - 8 amps @ 10,000 RPM
  • Trigger - Points or Hall effect
  • Maximum RPM - 15,000
  • Spark duration - 20 Degrees (Multi-Spark to 3,300 rpm)
  • Single Spark output - 190 Millijoules
  • Multi Spark output - 2280 Millijoules
  • Primary voltage to coils 490-505 volts
  • Reverse polarity protection - Yes
  • Over-voltage protection - Yes
  • Shift light/shifter output - 3 amps continuous
  • RPM window switch - 3 amps continuous
  • Cylinder Select - 1,2 & 4
MSD MC4 Accessories
Click here for MC-4 Accessories
MDS Pro-Data
Click here to download software

Supplied with the MC4 Digital Ignition will be the Pro-Data Plus Software. Once you've installed the software on your computer you'll be able to program the MC4. The software allows you to map all the ignition's features like you've never been able to do before! Some of the features you'll have control over include: the timing curve, start retard, launch ramp delay, step retard off delay for nitrous applications, gear retard, shift kill delay, boost retard curve, and RPM activated window switch. As improvements and new features are made to the MC4, you'll be able to download the software from Factory Direct Performance over the internet. Below are four of the screens showing the adjustability of the Pro-Data Plus Software.

Run Retard Curve  Launch Retard Curve
Boost Retard Curve   MC-4 Screen

MSD MC-4 wiring diagram


Part Number

Description Racer Price


 MSD MC-4 Ignition (MC-4 & Harness)


MC-4 Accessories

Part Number

Description Racer Price


 MPS Hayabusa to MC-4 Harness



 MSD Cam Sync Pickup



 MSD MC-4 Wire Harness



 MSD Vibration Mounts (qty 4)


Coils & Wires

Part Number

Description Racer Price


 MSD 4 Cylinder Plug Wire Kit



 MSD Blaster Coil (currently out of stock)


Trigger Pickups

Part Number

Description Racer Price


 MSD Trigger Pickups Only (2)