The MSD Programmable Digital-7 Plus set the standard for programmable ignition control and remains the choice for tuners who take advantage of minute timing changes during a quarter-mile pass. It includes Individual Cylinder Management, step retards, rev limits, shift points, and more, along with an upgraded 40MHz microcontroller for timing accuracy within 0.1 degrees and +/-1 RPM up to 10,000 RPM. The ignition is supplied with wiring harnesses, mounting hardware, an RS232 computer harness, and MSD's Pro-Data+ software on mini-CD; a MAP sensor is required for the boost circuit.
Specifications:
- Product Type: Ignition Box
- Primary Voltage: 535V / Secondary Voltage: 40,000V
- Spark Energy: 190 mJ per spark
- Maximum RPM: 12,500 RPM (at 14.4V)
- Current Draw: 1.1 Amp per 1,000 RPM
- Voltage Required: 12-18V, Negative Ground
- Weight & Size: 3 lbs., 9.5"L x 4.5"W x 2.2"H
- Part Number: 7531
Note: illegal for use in NHRA classes except Pro Mod; requires a MAP sensor for the boost retard circuit and MSD's Pro-Data+ software (included) for programming.
Compliance: This part is legal for sale and use on Racing Use Only Vehicles — competition vehicles that are not registered and never operated on the street. It is against the law to install this part on an Emissions Controlled Vehicle (1966-and-newer California-certified or 1968-and-newer federally certified vehicles).
FAQ
Is the MSD 7531 street legal?
No. It carries Emission Code 4, meaning it's legal for sale and use only on Racing Use Only vehicles — competition cars that are never registered or driven on the street.
What features does the Digital-7 Plus program?
Individual Cylinder Management, multi-stage step retards, rev limits tied to RPM or time, shift points, a complete timing curve per gear, and boost/vacuum retard through a MAP sensor.
What's needed to program the 7531?
MSD's Pro-Data+ software, supplied on mini-CD along with an RS232 computer harness and wiring harnesses.
Is the 7531 legal for NHRA racing?
No — MSD notes it is illegal for use in NHRA classes except Pro Mod.
