7531 Programmable Digital-7 Plus Ignition Control

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MSD IGNITIONPART NUMBER: 121-7531

7531 Programmable Digital-7 Plus Ignition Control

Name: 7531 Programmable Digital-7 Plus Ignition Control
Brand: MSD IGNITION
SKU: 121-7531
Price: 1171.95 USD
Availability: InStock

^$1,171⁹⁵

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Ships on Nov 02, 2026

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Digital-7 Plus

Digital-7 Plus Programmable Ignition Control

Individual Cylinder Management

Map Timing Curve for Every Gear

Activate Device via RPM, Time, or Pressure

Automatic Magnetic Pickup Compensation

Cam Sync Output

20-Degrees of Spark Duration

MSD Ignition 7531 Digital-7 Plus Programmable Ignition Control Includes:

Wiring Harnesses
Mounting Hardware
RS232 Computer Harness
Pro-Data+ Software on a Mini-CD

MSD Ignition 7531 Digital-7 Plus Programmable Ignition Control Features:

ICM Timing Control: Adjust ignition timing up to 5 degrees of retard into each cylinder in 0.1-degree increments
Run Curve: Plot a timing curve of 0.1 degrees per 100 RPMs throughout the entire rpm range
Launch Curve: Program a timing curve exclusively for the launch
Launch Retard: Retard the timing up to 15 degrees for 0-2.5 seconds after launch
Step Retards: Three steps of retard that can be activated with nitrous solenoids or switches
Gear Retards: Program a timing retard up to 5 degrees for every gear change
Start Retard: Ease engine cranking with an adjustable retard during start-up
Three-Step Rev Control: Program rev limits in 100 rpm increments for burnout, launch and overrev protection
Shift Light: Program a different rpm setting for each gear change for up to six gears
RPM Activated Window Switch: Activate a circuit at an adjustable rpm such as a nitrous solenoid, then set another rpm level to deactivate the same circuit
Map a complete timing curve for every gear
Stage retards can be set to ramp the timing
Updated X-Y plots with interpolation for smooth changes
View all ignition events in a new Launch History window including the retard sum, manifold pressure, RPM, shift points, and more
Select the RPM limiter value in RPM/Seconds
Vacuum advance and boost retard is selectable through a MAP sensor
There is a cam sync output for fuel controllers or data acquisition
Program your engine's firing order for ease of setting the cylinder-to-cylinder timing
Automatic magnetic pickup compensation for crank triggers or distributor pickups
Output to activate a device through RPM, time or pressure inputs
An upgraded microcontroller runs at 40mHz enabling timing accuracy within 0.1 degrees and +/- RPM at up to 10000 RPM

MSD Ignition 7531 Digital-7 Plus Programmable Ignition Control Specifications:

Spark Energy: 190 mJ per spark
Primary Voltage: 535 volts
Secondary Voltage: 40000 volts (tested with Pro Power HVC Coil)
Spark Series Duration: 20 degrees crankshaft rotation
RPM Range: 12500 RPM with 14.4 volts
Voltage Required: 12 to 18 volts (negative ground)
Current Draw: 1.1 amp per 1000 RPM
Size: 9.5 in. L x 4.5 in. W x 2.2 in. H
Weight: 3 lbs.

MSD Ignition 7531 Digital-7 Plus Programmable Ignition Control Note:

Illegal for use in NHRA classes except Pro Mod

Emissions Note:

This part is only legal for sale and use on Uncontrolled (Non-Emissions Controlled) Vehicles or on vehicles used solely for the purposes of closed competition racing.

CLICK THIS LINK FOR IMPORTANT CARB & EPA EMISSIONS INFORMATION ABOUT THIS PART

No Timing Compromises

Ignition timing is always a compromise between cylinders. The dynamics of air and fuel flow into each cylinder is never exactly the same no matter how much machining magic has been done. This has always caused top engine builders to compromise their ignition timing. With the Programmable 7-Series Race Ignition Boxes advanced Individual Cylinder Management system and other exact timing programs, you will never need to compromise again.

When you need race-proven ignition performance that won’t let you down, the MSD 7-Series Race Ignition Boxes are built to deliver. Engineered for serious competitors, these ignition systems offer unmatched spark energy, advanced features, and rugged construction to handle the harshest racing conditions.

The MSD Digital 7 ignition box delivers ultra-fast processing power and precision timing control, making it the ideal choice for high-horsepower drag, circle track, and off-road applications. With programmable RPM limits, timing curves, and data acquisition capabilities, this unit gives racers the ultimate edge in tuning and customization.

For those looking for legendary performance in a straightforward design, the MSD 7AL-2 remains a favorite in the racing community. It’s known for delivering a powerful capacitive discharge spark throughout the RPM range while providing built-in rev control and compatibility with MSD’s RPM modules for quick adjustments at the track.

The MSD 7-Series line stands apart with its durability, consistent output, and seamless integration with other MSD components. Whether you're pushing big boost, nitrous, or high compression, these ignition boxes provide the spark intensity and reliability needed to keep your engine firing strong—pass after pass.

Built for racers who demand precision and power, the MSD 7-Series Race Ignition Boxes are the backbone of countless winning setups. Trust MSD to ignite your competitive edge and help you dominate the race day.

Part TypeIgnition Box

Product LineMSD 7-Series Race Ignition Boxes

BrandMSD IGNITION

Package Height2.25 in (57.15 mm)

Package Width4.5 in (114.3 mm)

Package Length13.1

Weight6.38 PG

Part CategoryPerformance Parts

Current Draw1.1 amps per 1,000 rpm

Rev LimiterYes

QuantitySold individually

Overall Length9.5 in (241.3 mm)