Industrial Injection 232701 Cummins 12V 4000 RPM Governor Spring Kit for P7100 Injection Pump

The Industrial Injection 232701 4000 RPM Governor Spring Kit is one of the most impactful performance upgrades available for the 12-valve Cummins engine equipped with a P7100 injection pump. This governor spring kit (GSK) directly addresses a critical stock limitation that holds back power and drivability.

The Problem with the Stock Governor:

The factory governor generally begins to defuel the engine around 2300–2400 RPM, drastically decreasing performance and pulling power. This means your engine is being starved of fuel right in the middle of the RPM range where you need it most — under load, towing, or when spooling a turbo.

The Solution:

By installing the 4000 GSK into your P7100 injection pump, you allow the engine to fully fuel all the way to 4000 RPM, greatly increasing throttle response and performance while helping spool aftermarket turbos.

Key Features:

• Full fuel delivery extended to 4000 RPM — eliminates premature defueling
• Improved throttle response — noticeable improvement in pedal feel and engine reaction
• Faster turbo spool-up — ideal for trucks running aftermarket or upgraded turbos
• Increased performance and pulling power — especially under load and towing conditions
• Direct-fit installation into the factory P7100 injection pump

Industrial Injection recommends pairing this kit with their 150 lb valve springs to prevent valve float above 3200 RPM. This governor spring kit is a foundational upgrade for any 12-valve Cummins performance build.