The MSD Digital 6-Plus uses a high-speed RISC microcontroller to manage ignition output while constantly analyzing supply voltage, trigger signals, and RPM, holding timing accurate to within 1° and 1% of the RPM limits. Every spark carries 135 millijoules of spark energy at 535 primary volts, and for nitrous-equipped cars, a step retard pulls timing when the nitrous activates, backed by a 2-step rev limiter for holeshot consistency and overrev protection.Specifications: Compatibility: 4, 6, or 8-cylinder engines Voltage Required: 12-18V, negative ground Maximum RPM: 12,500 Spark Energy: 135mJ per spark Secondary Voltage: 45,000V Primary Voltage: 535V Current Draw: 0.7 amp per 1,000 RPM Weight/Size: 3.7 lbs, 8.5"L x 4.5"W x 2.2"H Color: Red Warranty: Manufacturer's Limited 1-Year Warranty Part Number: 6520 Accepts points, amplifier, and magnetic pickup inputs; a start retard eases pressure on the starter, flywheel, and engine.Compliance: This ignition control carries California Air Resources Board (CARB) Executive Order EO# D-722-2, making it legal for sale and use on Emissions Controlled Vehicles in all 50 states when installed per MSD's application guide.FAQIs the MSD 6520 Digital 6-Plus legal for street use in California?Yes. It carries CARB EO# D-722-2, making it legal for sale and use on Emissions Controlled Vehicles in all 50 states per MSD's application guide.How does the step retard work with nitrous?It retards ignition timing when the nitrous is activated, protecting the engine during nitrous use.What does the 2-step rev limiter offer?Two rev limits, adjustable with rotary switches in 100 RPM increments, for holeshot consistency and overrev protection.What engines is it compatible with?4, 6, or 8-cylinder engines with points, amplifier, or magnetic pickup inputs.{"@context":"https://schema.org","@type":"FAQPage","mainEntity":[{"@type":"Question","name":"Is the MSD 6520 Digital 6-Plus legal for street use in California?","acceptedAnswer":{"@type":"Answer","text":"Yes. It carries CARB EO# D-722-2, making it legal for sale and use on Emissions Controlled Vehicles in all 50 states per MSD's application guide."}},{"@type":"Question","name":"How does the step retard work with nitrous?","acceptedAnswer":{"@type":"Answer","text":"It retards ignition timing when the nitrous is activated, protecting the engine during nitrous use."}},{"@type":"Question","name":"What does the 2-step rev limiter offer?","acceptedAnswer":{"@type":"Answer","text":"Two rev limits, adjustable with rotary switches in 100 RPM increments, for holeshot consistency and overrev protection."}},{"@type":"Question","name":"What engines is it compatible with?","acceptedAnswer":{"@type":"Answer","text":"4, 6, or 8-cylinder engines with points, amplifier, or magnetic pickup inputs."}}]}
