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The Nissan 370Z, equipped with the VQ37VHR engine, is a popular choice for car enthusiasts looking to enhance performance. This guide will walk you through the steps to build your 370Z to achieve over 500 horsepower using JWT cams and a fuel injection (FI) upgrade.
Understanding the VQ37VHR Engine
The VQ37VHR is a 3.7-liter V6 engine known for its performance and tuning potential. It features a DOHC design and variable valve timing, making it an excellent candidate for upgrades.
Key Specifications
- Displacement: 3.7 liters
- Power: 332 hp (factory)
- Torque: 270 lb-ft (factory)
- Engine Type: V6, DOHC
Choosing JWT Cams
JWT (Jim Wolf Technology) cams are designed to enhance the performance of the VQ37VHR engine. They improve airflow and increase power at higher RPMs.
Benefits of JWT Cams
- Increased horsepower and torque
- Improved throttle response
- Enhanced engine sound
Fuel Injection Upgrade
Upgrading the fuel injection system is crucial for achieving the desired horsepower. A high-flow fuel system ensures that the engine receives the proper fuel supply to match the increased airflow from the JWT cams.
Components of the FI Upgrade
- High-flow fuel injectors
- Upgraded fuel pump
- Fuel pressure regulator
- ECU tuning
Building the 370Z
Now that you have a basic understanding of the components, let’s dive into the steps to build your 370Z for 500+ horsepower.
Step 1: Gather Necessary Tools and Parts
- Socket set
- Torque wrench
- Engine hoist
- JWT camshafts
- High-flow fuel injectors
- Upgraded fuel pump
- ECU tuning software
Step 2: Remove the Engine
Begin by disconnecting the battery and removing any components obstructing the engine. Use the engine hoist to safely lift the engine out of the bay.
Step 3: Install JWT Cams
With the engine out, remove the valve covers and timing chain. Replace the stock cams with JWT cams, ensuring proper alignment and torque specifications.
Step 4: Upgrade Fuel System
Install the high-flow fuel injectors and upgraded fuel pump. Ensure all connections are secure and check for any leaks.
Step 5: Reinstall the Engine
Carefully lower the engine back into the chassis. Reconnect all wiring, hoses, and components that were previously removed.
Step 6: ECU Tuning
Once the engine is reinstalled, it’s crucial to tune the ECU to optimize performance. Use tuning software to adjust fuel maps and ignition timing for the new setup.
Testing and Tuning
After the build is complete, it’s time to test the vehicle. Start the engine and check for any issues. Use a dynamometer to measure horsepower and torque output.
Final Adjustments
Based on the dynamometer results, you may need to make additional adjustments to the ECU tuning to achieve optimal performance.
Conclusion
Building a 370Z VQ37VHR to over 500 horsepower using JWT cams and a fuel injection upgrade is a rewarding project. With careful planning and execution, you can enjoy the thrill of driving a high-performance vehicle.