MSD 7531 Programmable Digital-7 Plus Ignition Control Box

The MSD 7531 Programmable Digital-7 Plus is a professional-grade capacitive discharge ignition control box engineered for serious engine tuners and competitive racers. Built around a high-speed 40 MHz micro-controller, it delivers timing accuracy within 0.1 degrees and ±1 RPM up to 10,000 RPM, making it ideal for drag racing, oval track, and high-performance forced induction applications.

At its core, the Digital-7 Plus delivers 190 mJ of spark energy, 40,000 volts of secondary voltage, and a spark duration spanning 20 degrees of crankshaft rotation — providing a powerful, consistent spark even under extreme cylinder pressures. Operating on 12–18 volts negative ground, it draws just 1.1 amps per 1,000 RPM and supports up to 12,500 RPM at 14.4 volts.

Key Features:

• Map a complete timing curve for every gear with updated X-Y plots and interpolation for smooth transitions
• Individual Cylinder Management (ICM) for precise cylinder-to-cylinder timing control
• Three programmable step retards that can be set to ramp timing — ideal for nitrous and boosted applications
• Multiple programmable rev limits with a launch RPM limiter that ramps in gradually
• Select RPM limiter ramp rate in RPM/seconds for precise launch control
• Vacuum advance and boost retard selectable via MAP sensor input
• Output trigger to activate external devices via RPM, time, or pressure inputs
• Cam sync output compatible with fuel controllers and data acquisition systems
• Automatic magnetic pickup compensation for crank triggers or distributor pickups
• Program engine firing order for simplified cylinder-to-cylinder timing setup
• Acquire up to 20 seconds of run data, including 2 seconds prior to launch
• Launch History window displays retard sum, manifold pressure, RPM, shift points, and more
• RS-232 computer connection with Pro-Data+ software included on mini-CD for laptop programming

What's Included: Wiring harnesses, mounting hardware, RS232 computer harness, and Pro-Data+ programming software on mini-CD.

Note: A MAP sensor is required for boost retard/vacuum advance functionality and is sold separately. This ignition is illegal for use in NHRA classes except Pro Mod. Racing use only.