The allure of enhancing a Mitsubishi Lancer Evolution’s performance can entice many enthusiasts into exploring various aftermarket upgrades. Among these, the crankshaft pulley often garners attention for its potential benefits. But can an upgraded crankshaft pulley genuinely increase horsepower in a Mitsubishi Lancer Evolution?
Understanding the Crankshaft Pulley
The crankshaft pulley is a vital component in your engine’s ecosystem. It is directly connected to the crankshaft and responsible for transferring power to several other key components, including the timing belt and water pump. A change in the crankshaft pulley can have significant ramifications on the overall performance of your vehicle.
The Role of the Stock Pulley
A stock pulley is designed with a balance of performance, durability, and cost in mind. Mitsubishi engineers have optimized the stock pulley to complement the rest of the engine’s components. However, many enthusiasts believe the stock pulley may not deliver the utmost performance.
The Aftermarket Solution: Underdrive Pulleys
An underdrive pulley is designed to reduce the parasitic drag on the engine by slowing down the accessories driven by the belt. This results in less work for the engine, theoretically freeing up horsepower torque for improved performance. These pulleys are often lighter, contributing to a reduction in overall engine weight, which can positively impact throttle response.
Evaluating the Claims: Horsepower Gains
The core question remains: can an upgraded crankshaft pulley increase horsepower in a Mitsubishi Lancer Evolution? Forum members and various aftermarket manufacturers claim horsepower gains ranging from minimal to significant.
User Experiences and Forum Discussions
A dive into the forums reveals a myriad of experiences and opinions. One forum thread might feature a Mitsubishi Evo owner claiming noticeable gains in power and improved throttle response following the installation of an underdrive pulley. Another post might cite a different experience, with minimal perceptible changes. It’s essential to parse these experiences critically.
Quote Originally Posted by Forum Members
Numerous posts, such as “quote originally posted by” users in forums, provide anecdotal evidence. For instance, a typical reply might highlight, “Originally posted by user123: ‘The underdrive pulley on my Evo significantly improved throttle response and added a few horses to the wheels.’”
Dyno Testing and Empirical Evidence
Empirical data from dyno testing can be a more reliable indicator. While some tests show gains of up to 5-10 horsepower, others demonstrate more modest improvements. The variation can be attributed to the condition of the car, existing modifications, and the specific type of underdrive pulley used.
Potential Risks and Considerations
While the promise of increased horsepower is tempting, potential risks and considerations must be addressed.
Harmonic Balancer and Engine Vibration
The stock pulley includes a harmonic balancer, which helps to dampen engine vibrations. An underdrive pulley might not include this feature, potentially leading to increased engine wear over time. This could affect main bearings and other engine components adversely.
Balance Shafts and Long-Term Engine Health
Balance shafts are designed to reduce engine vibration and ensure smoother operation. Altering the pulley system can impact the balance, leading to potential long-term issues with engine reliability.
Warranty and Legal Considerations
Modifying your car with aftermarket parts can void warranties and may not comply with local regulations. It’s crucial to verify the legal implications and warranty conditions before making any modifications to your Mitsubishi Lancer Evo.
Installation Process and Practical Tips
For those determined to proceed, understanding the installation process and practical tips is crucial.
Tools and Preparations
Installing an underdrive pulley requires specific tools, including a pulley puller, torque wrench, and possibly a belt tensioner tool. Ensuring you have the correct tools and a comprehensive guide is essential.
Step-by-Step Installation
- Preparation: Disconnect the battery and lift the car securely.
- Remove the Belt: Loosen the belt tensioner and remove the drive belt.
- Detach the Stock Pulley: Use the pulley puller to remove the stock pulley.
- Install the Underdrive Pulley: Align and secure the new pulley, ensuring it’s torqued to the manufacturer’s specifications.
- Reinstall the Belt: Place the belt over the new pulley and adjust the tensioner accordingly.
- Check Engine Operation: Reconnect the battery and start the engine, watching for any unusual noise or vibration.
Post-Installation Checks
It’s vital to monitor the engine closely after installation. Ensure no abnormal vibrations or noises occur, which could indicate improper installation or incompatibility.
So, can an upgraded crankshaft pulley increase horsepower in a Mitsubishi Lancer Evolution? The answer is nuanced. While some users report noticeable gains and improved performance, others find the benefits marginal. It’s crucial to weigh the potential horsepower gains against the risks of increased engine wear and the loss of the harmonic balancer.
For enthusiasts seeking every ounce of performance, an underdrive pulley could provide a slight edge, especially when combined with other modifications. However, for those concerned with long-term engine health and warranty considerations, sticking with the stock pulley might be the wiser choice.
Ultimately, the decision rests with you, informed by your priorities and willingness to manage the inherent risks. The Mitsubishi Lancer Evolution is a high-performance machine, and any modifications should be carefully considered to ensure your car continues to deliver the exhilarating driving experience it’s known for.
