4BTA/4BTAA Compound Turbo Kit for 8V Cummins 3.9L
The Diesel Power Source 4BTA Compound Turbo Kit for 8V Cummins engines is designed for electronically controlled 4BTA /4BTAA platforms where smooth boost behavior, airflow efficiency, and drivability are essential. This compound system stages two turbos together to deliver predictable boost at low RPM while maintaining strong airflow under sustained load.
Single turbo setups often struggle to balance response and top-end efficiency on 8V engines. By splitting the workload between a quick-spooling primary turbo and a high-flow atmospheric turbo, this system improves throttle response, helps manage exhaust gas temperatures, and supports higher power potential without pushing components beyond their efficiency range.
Built using the same compound design philosophy found in DPS 6-cylinder Cummins systems, this kit is optimized specifically for 8V 4BTAA applications and electronic fueling strategies. It’s ideal for custom swaps, work-focused builds, and performance projects that demand consistent, controllable power.
Key Benefits
- Smooth boost control: staged airflow improves drivability on electronic 4BT setups
- Improved response: faster spool compared to many single turbo configurations
- Lower EGTs: increased airflow efficiency under load
- Expandable performance: supports future fueling and power upgrades
Typical Applications
Designed for aftermarket and swapped applications including custom trucks, step vans, utility vehicles, off-road rigs, and specialty diesel builds using a 8V 4BTA or 4BTAA 3.9L Cummins engine. Fitment depends on engine placement and fabrication requirements.
The round-port 8-valve heads are typically paired with factory turbo setups, which fall under:
- 4BTA (turbocharged)
- 4BTAA (turbo + aftercooled)
This kit is designed specifically for 24V 4BT engines and electronic fueling systems. Turbo sizing, airflow balance, and boost behavior are matched to the characteristics of the 24V platform.
This is an aftermarket performance system intended for custom and swapped applications. Fabrication, tuning, and supporting modifications may be required depending on your build.
Compound turbos provide improved boost control, faster response, lower EGTs, and better airflow efficiency compared to a single turbo attempting to cover the full operating range.
Common applications include custom truck builds, step vans, off-road rigs, utility vehicles, and other diesel swap projects using a 24V 4BT engine.
