How is turbo speed controlled on the GHG17 and Gen 5 engines?

Turbo speed on the GHG17 and Gen 5 engines is primarily controlled through fuel mapping and exhaust gas recirculation (EGR) strategies. This approach allows the engine control unit to optimize the amount of fuel injected based on various operational parameters, ensuring that the turbocharger operates efficiently and within the desired speed range.

By adjusting the fuel mapping, the engine can provide the necessary power and response while managing emissions. EGR plays a significant role by recirculating a portion of the exhaust back into the intake, which helps to cool the combustion process and can affect the turbo operation. This combination allows for better control of turbo speed under different loading and operating conditions, hence improving overall engine performance and efficiency.

In contrast, factors like turbocharger size and design influence the potential maximum speed and efficiency of the turbo but do not actively control the turbo speed during engine operation. Electronic control unit settings are a broader term that could encompass many functions, including fuel mapping, but it is the specific interaction of fuel mapping and EGR that directly affects turbo speed management under varying conditions. Mechanical adjustments, while relevant in older systems, are less common in modern engine designs like the GHG17 and Gen 5, which rely more on electronic controls and sophisticated software