How To Take Governor Off Car

Alright, let's talk about removing the governor from your car's engine. This is a modification often considered by those looking to push their vehicle's performance beyond factory limits. It's a significant step, and it's crucial to understand the implications before diving in. We're not going to sugarcoat it; removing a governor isn't always the best idea, and it carries potential risks. But for those who are well-informed and understand the trade-offs, it can unlock a vehicle's hidden potential.

Understanding the Engine and Governor System

Before we get our hands dirty, let's establish a solid understanding of what a governor is and how it functions. A governor, in its simplest form, is a speed-limiting device. It's designed to prevent the engine from exceeding a pre-set maximum RPM (Revolutions Per Minute), or vehicle speed. This limitation can be implemented for a few key reasons:

Engine Protection: Exceeding the engine's safe RPM limit can lead to catastrophic failure. Connecting rods can break, valves can float, and the entire engine can essentially grenade itself. The governor is a safety net to prevent this.
Component Longevity: Limiting RPMs and top speed reduces stress on various components like the transmission, driveshaft, and tires, potentially extending their lifespan.
Safety Regulations: In some cases, vehicle speed is legally restricted, particularly for commercial vehicles or specific applications.
Fuel Efficiency: Limiting top speed can improve overall fuel economy.

Governors are typically implemented in one of a few ways:

Mechanical Governors: These are older systems that use centrifugal force to regulate the throttle. As engine speed increases, weights spin outwards, restricting the throttle linkage. These are rarely found in modern cars, but are common in older machinery.
Electronic Governors: The most common type in modern vehicles. These systems use the engine control unit (ECU) to monitor engine speed and vehicle speed. When the pre-set limit is reached, the ECU will cut fuel, spark, or both to limit engine output. This is done by controlling the fuel injectors and/or ignition system.
Throttle Limiter: A physical obstruction preventing the throttle from opening fully. This is a simpler approach but less common in performance-oriented vehicles.

Technical Breakdown: How Electronic Governors Work

Since electronic governors are the most prevalent in modern cars, let's delve into their operation. The ECU receives signals from various sensors, including:

Crankshaft Position Sensor (CKP): Provides information on engine RPM.
Vehicle Speed Sensor (VSS): Measures the speed of the vehicle.

The ECU then compares these readings to pre-programmed limits stored in its memory. If either the RPM or vehicle speed exceeds the programmed limit, the ECU intervenes to reduce engine power. This is usually accomplished through one or both of the following methods:

Fuel Cut-off: The ECU momentarily shuts off the fuel injectors, interrupting the fuel supply to the engine. This results in a noticeable "stutter" or hesitation.
Ignition Retard: The ECU retards (delays) the ignition timing, reducing the efficiency of combustion and, consequently, engine power.

The intervention is typically gradual and subtle, preventing a sudden jolt that could be dangerous. Once the speed drops below the limit, the ECU restores normal fuel and ignition settings.

The Process of Governor Removal/Modification

There are generally three approaches to removing or bypassing an electronic governor:

ECU Tuning/Reflashing: This is the most recommended and safest approach. It involves modifying the ECU's software to either raise the governor limit or disable it entirely. This requires specialized software and hardware, as well as a thorough understanding of engine management systems. Many aftermarket tuning companies offer pre-programmed tunes that remove the governor, or you can have a custom tune created for your specific vehicle and modifications.
Caution: Flashing an ECU can be risky if not done correctly. Incorrect files or a power interruption during the process can brick the ECU, rendering it unusable.
Aftermarket Piggyback Devices: These devices intercept and modify the signals between the ECU and the engine sensors. They can trick the ECU into thinking the vehicle is not exceeding the speed limit, allowing the engine to continue accelerating. While simpler to install than a full ECU reflash, piggyback devices can sometimes cause unexpected issues and are generally less reliable.
Sensor Manipulation (Not Recommended): This involves physically altering or disconnecting sensors to prevent the ECU from detecting the speed limit. This is generally a very bad idea, as it can lead to inaccurate readings, poor engine performance, and potential damage to the engine or other vehicle systems. For example, disconnecting the VSS might disable the speedometer and other crucial functions.

Steps for ECU Tuning (General Overview):

Research Tuning Options: Identify reputable tuning companies or independent tuners specializing in your vehicle's make and model. Read reviews and compare pricing.
Acquire Tuning Hardware/Software: Purchase the necessary hardware and software from your chosen tuning provider. This might include a handheld programmer or a laptop interface cable.
Download the Correct Tune File: Obtain the appropriate tune file from the tuner. Ensure it's specifically designed for your vehicle, engine, and any modifications you've made.
Flash the ECU: Follow the tuner's instructions carefully to flash the ECU with the new tune file. This typically involves connecting the tuning device to the vehicle's OBD-II port and following on-screen prompts. Important: Maintain a stable power supply to the vehicle during the flashing process to prevent data corruption.
Test and Monitor: After flashing the ECU, test the vehicle to ensure the governor has been removed and that the engine is running properly. Monitor engine parameters like air/fuel ratio and engine temperature to ensure they are within safe limits.

Common Issues and Maintenance Concerns

Removing the governor can lead to several potential problems:

Increased Stress on Engine and Components: Operating the engine at higher RPMs can significantly increase stress on the engine, transmission, and other driveline components, potentially shortening their lifespan.
Overheating: Sustained high-speed operation can lead to overheating, especially if the cooling system is not adequately upgraded.
Tire Failure: Exceeding the speed rating of your tires can lead to catastrophic tire failure, which can be extremely dangerous.
Reduced Fuel Economy: Operating at higher speeds and RPMs will inevitably decrease fuel efficiency.
Warranty Voidance: Modifying the ECU or engine components will almost certainly void your vehicle's warranty.
Legal Implications: Removing the governor may be illegal in some jurisdictions, particularly for commercial vehicles.

To mitigate these risks, consider the following:

Upgrade Cooling System: Install a larger radiator, higher-flow water pump, and auxiliary oil cooler to improve cooling capacity.
Upgrade Brakes: Ensure your brakes are capable of handling the increased speeds and stopping power requirements. Consider upgrading to larger rotors, performance brake pads, and stainless steel brake lines.
Use Performance Tires: Install tires with a speed rating appropriate for the speeds you intend to reach. Regularly inspect tires for wear and damage.
Monitor Engine Parameters: Use a scan tool or aftermarket gauges to monitor engine parameters like coolant temperature, oil pressure, and air/fuel ratio.
Regular Maintenance: Perform regular maintenance, including oil changes, fluid checks, and inspections, to ensure all components are in good working order.

Do's and Don'ts / Best Practices

Do's:

Research Thoroughly: Understand the risks and potential consequences before removing the governor.
Choose a Reputable Tuner: Select a tuner with experience and a proven track record.
Use Quality Parts: Install high-quality aftermarket parts to ensure reliability and performance.
Monitor Engine Parameters: Regularly monitor engine parameters to detect any potential problems early on.
Drive Responsibly: Even with the governor removed, drive safely and responsibly, and obey all traffic laws.

Don'ts:

Don't Use Sensor Manipulation: Avoid methods that involve tampering with or disconnecting sensors.
Don't Exceed Component Limits: Respect the limits of your vehicle's components, even with the governor removed.
Don't Ignore Warning Signs: Pay attention to any warning signs, such as unusual noises, vibrations, or temperature fluctuations.
Don't Drive Under the Influence: Never drive under the influence of alcohol or drugs.

Conclusion

Removing the governor from your car can unlock performance potential, but it's a decision that should be approached with caution and careful consideration. The safest and most reliable method is through ECU tuning by a qualified professional. Before making any modifications, weigh the benefits against the risks, and be prepared to invest in necessary upgrades and maintenance. Ultimately, the decision is yours, but proceed with knowledge and responsibility.

Recommendation: If you're determined to remove the governor, prioritize ECU tuning from a reputable source and invest in necessary supporting modifications to ensure the longevity and reliability of your vehicle. Always drive safely and be aware of the potential consequences of exceeding factory limits.