Upgrading the ignition system is a key step in maximizing performance in high-output or high-revving engines. Spark energy becomes even more crucial when boost is part of the equation. A stronger, more precise spark improves throttle response, combustion efficiency, and high-RPM stability—exactly where performance matters most.
Enter the MSD Ultra 6AL and Ultra 6AL Plus ignition boxes, “The MSD Ultra 6 Series Ignition Boxes are the latest evolution in our iconic 6 Series lineup,” says Calvin Gazda, Sr, Product Manager for MSD. "With the addition of Bluetooth app capability, higher spark output, and detailed timing control, our Ultra 6A, 6AL and 6AL Plus boxes pack quite the punch, all in a smaller, lighter package than our iconic Digital 6AL box.”
The MSD Ultra 6AL and Ultra 6AL Plus feature a more compact and lightweight design compared to previous models, making them easier to mount in tight engine bays or interiors. Their reduced size allows for greater flexibility in placement, simplifying installation and freeing up space for other performance components.
A lighter ignition box also contributes to overall weight savings—an important factor in competitive builds where every pound counts. The Ultra 6AL measures 3.3 x 3.8 inches and weighs 344 grams. The Ultra 6AL Plus comes in at 3.3 x 5.2 inches and weighs 498 grams. Both are available in either red or black finish. With up to 45% smaller dimensions and improved packaging, these units are ideal for both street and race applications where space and efficiency matter.
The MSD Ultra 6AL and Ultra 6AL Plus deliver a powerful spark energy output of 135 to 150 millijoules (mj), a significant boost over stock ignition systems. This high-energy spark ensures complete combustion of the air/fuel mixture, which is critical for making consistent power—especially in high-compression, forced induction, or high-RPM applications. The Ultra 6AL and Ultra 6AL Plus are easily installed on any 4-, 6-, or 8-cylinder engine that runs a distributor ignition. It’s designed to provide maximum spark energy of 135mj to 150mj for every spark firing from idle to redline rpm. The spark duration lasts for 18 degrees of crankshaft rotation, and primary voltage is 520 to 540 volts. Maximum rpm is 15,000 on a 14.4-volt system.
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From a smooth idle to wide-open throttle at redline, the increased spark energy helps maintain performance, throttle response, and fuel efficiency. It also reduces the chance of misfires under load, making it a key upgrade for serious street or race builds.
The MSD Ultra 6AL Plus takes tuning convenience to the next level with built-in Bluetooth functionality, allowing users to make real-time adjustments directly from their smartphone or tablet. No more laptops or handheld programmers—just open the app and dial in your setup with ease. “MSD has yet again changed the game with Bluetooth app-controlled rev limiter and timing adjustments," says Gazda. "Customers love the ability to drive to the track, adjust timing curve(s) and rev limits, make a few passes; And then load a street timing curve back in and drive home…All from our easy-to-use mobile app.”
Key features accessible via Bluetooth include setting rev limits, adjusting timing curves, and fine-tuning boost pressure-based timing retard, all from a user-friendly interface. This wireless control puts powerful tuning tools right at your fingertips, any time anywhere.
The MSD Ultra 6AL Plus features three independent rev limiters for burnout, launch, and high-RPM cutoff, giving racers precision control over engine speed during each phase of a run. This allows you to hold consistent RPMs for clean burnouts, launch hard without overpowering the tires, and protect the engine from over-revving down track. The launch limit can be activated from the transbrake or off the clutch. The app allows 10-rpm increment changes to any of the rev limits. The user can also set the timing curve based on time after launch, which helps when traction conditions are less than ideal.
With wireless control via Bluetooth, you can adjust these rev limits and fine-tune timing curves in real time—no tools, no cables, no delays. For drag racers and serious performance enthusiasts, this level of control means better consistency, quicker reaction times, and optimized performance at every stage of the pass. “Ten years ago mobile app-based tuning made users nervous," quips Gazda. "Fast forward to 2025 and smartphones have become the preferred method of tuning on-the-fly which makes the Ultra 6AL and 6AL Plus an excellent choice for Drag & Drive participants.”
The MSD Ultra 6AL Plus is equipped with a built-in 4 BAR MAP sensor, allowing it to read up to 43 psi of boost—making it fully compatible with turbochargers, superchargers, and ProChargers. This expanded boost range ensures the ignition system can handle everything from mild street setups to full-blown race applications.
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With accurate boost monitoring, the system can apply boost-based timing control, pulling timing as pressure increases to prevent detonation and engine damage. This not only enhances performance under high load but also improves engine safety, giving tuners the confidence to push their setup without risking costly failures.
The MSD Ultra 6AL and Ultra 6AL Plus feature built-in protections against coil shorting, excessive temperatures, and load faults, ensuring the ignition system stays safe under demanding conditions. These safeguards automatically monitor critical functions and shut down or adjust output when potential issues are detected.
This added layer of protection significantly enhances the reliability and longevity of the system, especially in high-stress racing environments. By preventing damage before it happens, these features help maintain consistent performance and reduce the risk of failure when it matters most.
The MSD Ultra 6AL and Ultra 6AL Plus ignition boxes are compatible with a wide range of performance ignition coils, making them a versatile solution for many engine setups. While they work well with various aftermarket and OE-style coils, they’re specifically optimized for use with MSD’s Blaster HVC and HVC II coils.
These high-output coils are engineered to handle the increased spark demands generated by the Ultra ignition boxes, delivering maximum voltage and energy across the RPM range. To simplify setup and ensure peak performance, the ignition box features automatic coil detection, which adjusts internal parameters to match the connected coil’s characteristics. This means you get maximum spark output and reliable performance without the need for manual configuration.
For racers and tuners, this seamless optimization ensures the ignition system delivers consistent, powerful spark under all conditions—whether you’re idling in traffic or pushing hard at the track.
The bottom line reveals MSD Ultra 6AL and 6AL Plus ignition boxes deliver exceptional performance and flexibility for both street and race applications. With powerful features like adjustable timing, Bluetooth control, built-in safety protections, and compatibility with a variety of coils, these ignition systems offer the perfect balance of performance, convenience, and reliability. Their compact size, aesthetic customization options, and intuitive mobile app interface make them ideal for tuners and racers who demand the best in performance and ease of use. Whether you're pushing your vehicle to the limit at the track or enjoying daily drives, the MSD Ultra 6AL series ensures consistent, reliable power where you need it most.
