Deleting the EGR (Exhaust Gas Recirculation) system on a Detroit Diesel DD15 engine is a popular modification, often done in conjunction with other emissions system deletes. This guide outlines the process and considerations for a Dd15 Egr Cooler Delete Kit.
While this guide provides a comprehensive overview, it’s crucial to remember that tampering with emissions systems is illegal for on-road vehicles in many jurisdictions. This information is for off-road or competition use only. Always comply with local, state, and federal regulations.
Understanding the DD15 EGR System and Deletion
The EGR system recirculates a portion of exhaust gases back into the intake manifold, lowering combustion temperatures and reducing NOx emissions. However, this can lead to carbon buildup and potential component failures. An EGR delete aims to eliminate these issues. A complete delete typically involves ECM (Engine Control Module) tuning and physically blocking off EGR flow.
ECM Tuning for DD15 EGR Delete
ECM tuning is essential for a successful EGR delete. It reprograms the engine’s computer to prevent fault codes and ensure optimal performance without the EGR system. Reputable tuners often offer mild power upgrades alongside EGR delete tunes, potentially improving fuel efficiency. This tuning also addresses the removal of other emissions components like the DPF (Diesel Particulate Filter), DOC (Diesel Oxidation Catalyst), SCR (Selective Catalytic Reduction), and DEF (Diesel Exhaust Fluid) system.
Blocking EGR Flow on a DD15
Physical blockage prevents exhaust gases from entering the intake manifold. This typically involves installing block-off plates on both the “hot side” (where the EGR cooler connects to the exhaust manifold) and the “cold side” (where the EGR cooler connects to the intake manifold).
Blocking off the EGR cooler on the exhaust side of a DD15 engine.
Blocking both sides ensures a complete seal, preventing exhaust leaks and air leaks. Some opt to block the EGR cooler’s flex pipe using expansion plugs.
Blocking the flex pipe of the EGR cooler with expansion plugs.
On the intake side, a block-off plate is placed between the crossover pipe and the intake manifold. The process is similar across DD13, DD15, and DD16 engines.
Blocking the EGR cooler on the intake side (crossover pipe) of a DD15 engine.
DD15 EGR Cooler Delete Kit Considerations
While a DD15 EGR cooler delete kit can offer potential benefits like increased reliability and improved fuel economy, it’s crucial to weigh the legal and environmental implications. Remember, this modification is strictly for off-road use. Choosing a reputable tuner and quality block-off plates is essential for a successful and reliable delete. Always consult with a qualified diesel mechanic for guidance and ensure compliance with all applicable laws and regulations.
