How to increase horsepower on WRX?
The Subaru WRX is a beloved performance car known for its turbocharged engine and rally-inspired design. However, many enthusiasts seek to push its limits by increasing its horsepower. Whether you're looking for a modest boost or a significant power upgrade, there are several proven methods to enhance your WRX's performance. In this guide, we'll explore the most effective ways to increase horsepower while maintaining reliability.
1. Upgrade the Exhaust System
One of the first modifications many WRX owners make is upgrading the exhaust system. A high-performance exhaust can improve airflow, reduce backpressure, and allow the engine to breathe more freely, resulting in increased horsepower.
- Cat-Back Exhaust: Replacing the stock exhaust with a cat-back system can improve sound and performance without affecting emissions.
- Downpipe Upgrade: A high-flow or aftermarket downpipe can significantly enhance turbo efficiency and power output.
2. Install a Cold Air Intake
A cold air intake system allows your WRX to draw in cooler, denser air, which improves combustion efficiency. This relatively simple modification can provide a noticeable increase in horsepower and throttle response.
3. Tune the Engine
ECU tuning is one of the most effective ways to unlock additional horsepower from your WRX. By reprogramming the engine control unit (ECU), you can optimize fuel delivery, ignition timing, and boost pressure for maximum performance.
- Off-the-Shelf Tunes: Pre-configured tunes are available for common setups and are easy to install.
- Custom Tunes: For more significant modifications, a custom tune tailored to your specific setup is recommended.
4. Upgrade the Turbocharger
The WRX comes equipped with a turbocharger, but upgrading to a larger or more efficient turbo can dramatically increase horsepower. Keep in mind that this modification often requires supporting upgrades, such as a stronger fuel system and intercooler.
5. Improve the Fuel System
To support higher horsepower levels, you may need to upgrade your fuel system. This includes installing larger fuel injectors, a high-flow fuel pump, and possibly an upgraded fuel pressure regulator.
6. Add an Intercooler Upgrade
An upgraded intercooler helps reduce the temperature of the compressed air from the turbocharger, improving efficiency and preventing power loss due to heat soak. Front-mount intercoolers are a popular choice for WRX owners seeking significant power gains.
7. Use High-Quality Engine Oil and Maintenance
While not a direct horsepower modification, using high-quality engine oil and keeping up with regular maintenance ensures your WRX runs at peak performance. A well-maintained engine is more efficient and capable of handling increased power.
8. Consider Weight Reduction
Although not directly related to horsepower, reducing the weight of your WRX can improve its power-to-weight ratio, resulting in better acceleration and overall performance. Consider lightweight wheels, a carbon fiber hood, or removing unnecessary interior components.
Final Thoughts
Increasing the horsepower of your Subaru WRX can be an exciting and rewarding project. However, it's essential to approach modifications carefully and ensure that your upgrades are compatible with each other. Additionally, always prioritize reliability and safety to avoid damaging your vehicle. If you're unsure about any modifications, consult with a professional mechanic or performance shop for guidance.
At Kevin's Autos, we have years of experience in car maintenance and performance upgrades. If you're looking to enhance your WRX's horsepower, feel free to contact us for expert advice and services!
Frequently Asked Questions
How much HP does Cobb add to WRX?
Cobb accessport will give approx 25+ hp and 14+ torque. The cold air intake from cobb will not give any more hp gains but will give the intake some noises and make the car seem faster or stronger. The stock intake is roughly good for about 400 hp.
What is the fastest WRX made?
Subaru WRX Project Midnight
It's called the Subaru WRX Project Midnight, it's very black and it packs a Nissan GT-R beating 670 horsepower.
How to increase horsepower in WRX?
4- Performance Tuning: WRX Cold Air Intakes
Adding a cold air intake can significantly boost horsepower and torque. Taking the upgrades further with an axle back exhaust system also enhances the distinctive boxer engine growl, providing an exhilarating driving experience.
How much horsepower can you put in a WRX?
With simple bolt-on parts (bolt-on meaning you don't have to take apart the actual block or heads), we can increase the horsepower of the WRX (either standard or STI) to over 400. This will make the car quite quick. Of course, remember that the car is a complete system.
How much HP is a stage 2 WRX?
Power Gains
| Stage2 91 | 93 Values | |
|---|---|---|
| Peak HP Increase | 12.0% | 275.3 hp @ 5430rpm vs 234.8 hp @ 5640rpm |
| Max TQ | 37.3% | 320.6 ft-lb vs 223.0 ft-lb @ 3150rpm |
| Max HP | 36.6% | 191.1 hp vs 133.8 hp @ 3170rpm |
| Average TQ | Stock 221.6 ft-lb | Tuned 320.8 ft-lb |
How much HP is Stage 3?
Typically, a stage 3 tune can result in a horsepower increase of anywhere from 20% to 40% over the stock figures. For some cars, this might mean an additional 50 HP, while for others, it could mean an increase of 100 HP or more. The starting horsepower of the vehicle plays a significant role.
How much HP will Stage 1 add?
Most Stage 1 type modifications are typically in the +10-15% power increase over stock. Stage 2: this is typically referred to an engine with a performance cam upgrade as well as the other components within a Stage 1 combination. A typical Stage 2 has generally +20-25% more HP than stock.
How much HP does Stage 1 add WRX?
Power Gains
| Stage1 91 | 93 Values | |
|---|---|---|
| Peak TQ Increase | 18.6% | 336.0 @ 3160rpm vs 273.8 ft-lb @ 2920rpm |
| Peak HP Increase | 4.1% | 293.5 hp @ 5680rpm vs 270.1 hp @ 5510rpm |
| Max TQ | 23.4% | 335.5 ft-lb vs 261.6 ft-lb @ 3200rpm |
| Max HP | 23.1% | 202.5 hp vs 158.3 hp @ 3200rpm |
Is a WRX considered fast?
Both options are quick and can move the WRX from zero to 60 mph in around 5.5 seconds.
How much hp does stage 2 add?
Stage 2: this is typically referred to an engine with a performance cam upgrade as well as the other components within a Stage 1 combination. A typical Stage 2 has generally +20-25% more HP than stock.
