For Mitsubishi Evo owners seeking to optimize their launch control and achieve quicker 60-foot times at the drag strip, disabling the factory-set rev limiter can be a tempting modification. The rev limiter is intentionally designed as a safety mechanism to prevent engine damage from overly aggressive launches. However, some drivers, particularly those focused on competitive drag racing, may choose to bypass this safeguard to unlock greater performance. This guide, derived from community insights and hands-on experience, will detail how to safely disconnect the rev limiter on your Evo. Please be aware that performing this modification is at your own risk. Disabling safety features can lead to potential damage if not handled responsibly.
Before proceeding, it’s important to understand the function of the rev limiter in your Mitsubishi Evo. Typically, in models like the 2005 Evo, the rev limiter engages around 5000 RPM when the car is in gear with the clutch depressed and before forward motion begins. This limit is in place to protect the engine during launch scenarios. Disabling it allows for higher RPM launches, potentially improving acceleration and launch times, but also increasing the risk of drivetrain stress and engine damage if not managed carefully.
This modification, initially discussed in a 2004 forum thread, can be completed with basic tools and should take approximately 5-10 minutes. This expanded guide aims to provide clearer instructions for those looking to perform this modification.
Tools Required
To complete this modification, you will need the following simple tools:
- Phillips head screwdriver
- Small needle nose pliers
- 10mm wrench or socket
Step-by-Step Guide to Disabling the Rev Limiter
Step 1: Disconnect the Battery
Begin by ensuring the car is safely powered down. Disconnect the negative terminal of your car battery. This crucial step prevents electrical shorts and ensures safety during the modification process.
Step 2: Access the Fuse Panel Area
Locate the panel beneath the steering wheel. This is where the necessary fuse panel is situated. You can either remove the small access panel or, for easier access, fully remove the lower dash panel. Removing the lower dash, secured by a couple of Phillips head screws, provides more room to maneuver and reach the connector.
Opening the lower dash panel will give you a clearer view and more space to work with when disconnecting the plug.
Step 3: Identify the Rev Limiter Plug
Locate the specific plug that controls the rev limiter. It’s situated within the fuse panel area, typically accessible from beneath the steering column.
This plug is identifiable and needs to be disconnected to disable the 5000 RPM rev limiter.
Step 4: Disconnect the Plug
Carefully disconnect the identified plug. Use a small Phillips head screwdriver to gently push up on the white tab that secures the plug in its place. While pushing up on the tab, use the needle nose pliers to gently pull the plug out from its connection.
With the tab released, carefully pull the plug out using pliers, ensuring not to damage the connector or wires.
Step 5: Secure the Disconnected Plug and Reassemble
Once disconnected, simply let the plug dangle freely. It does not need to be connected to anything else. Reassemble the lower dash if you removed it, and reconnect the negative battery terminal.
Potential Aftereffects and Important Warnings
After disabling the rev limiter, you will notice a change in your Evo’s behavior. One common aftereffect is a slower RPM drop when shifting at high RPMs. This can have both positive and negative implications.
Pros:
- Easier Rev Matching: The slower RPM drop can actually make rev-matching easier for smoother downshifts, particularly beneficial for performance driving and track use.
Cons:
- Slower Deceleration When Coasting: When you release the accelerator while in gear, the RPMs will decrease more slowly, making it feel like the car is not decelerating as quickly. This can be particularly noticeable when approaching corners or needing to slow down rapidly. It might feel as if you are still slightly pressing the gas pedal.
- Increased Risk of Engine Damage: Most importantly, removing the rev limiter removes a crucial safety measure. Over-revving your engine can lead to serious and expensive damage. It is imperative to be extremely cautious and aware of your RPM levels, especially during launches and high-speed driving.
Reversing the Modification:
To revert your Evo back to its original rev limiter settings, simply disconnect the battery again (negative terminal first), and reconnect the plug you disconnected in Step 4. Then, reconnect the battery.
Disclaimer: This modification is for informational purposes only and intended for off-road or track use. Disabling the rev limiter is done at your own risk. [obd-de.com] is not responsible for any damage or issues that may arise from performing this modification. Proceed with caution and ensure you understand the risks involved before attempting to disable your vehicle’s rev limiter. Always prioritize safe driving practices and vehicle maintenance.
