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The Grand National, known for its impressive performance and turbocharged power, is a favorite among car enthusiasts. One of the most popular upgrades for these vehicles is the installation of a used Precision 71mm turbo. This article will guide you through the steps to safely refit a used Precision 71mm turbo for achieving 450+ horsepower.
Understanding the Precision 71mm Turbo
The Precision 71mm turbo is renowned for its efficiency and capability to support high horsepower levels. Before starting the installation process, it is crucial to understand its specifications and how it fits into the Grand National’s performance framework.
- Compressor Wheel Size: 71mm
- Turbine Wheel Size: 68mm
- Maximum Horsepower: 800 hp
- Optimal Boost Range: 20-30 psi
Preparation for Installation
Before diving into the installation, proper preparation is essential. This includes gathering all necessary tools and components, as well as ensuring the turbo is in good condition.
- Tools Needed:
- Socket set
- Torque wrench
- Screwdrivers
- Wrenches
- Oil catch can
- Replacement Parts:
- Gaskets
- Oil feed line
- Oil return line
- Intercooler piping
Step-by-Step Installation Process
1. Remove the Old Turbo
Start by safely removing the old turbocharger. Ensure that the engine is cool and disconnect the battery to avoid any electrical issues.
- Disconnect the oil feed and return lines.
- Remove the intake and outlet pipes.
- Unbolt the turbo from the manifold.
2. Inspect the Used Precision 71mm Turbo
Before installation, inspect the used turbo for any signs of wear or damage. Look for:
- Play in the shaft
- Damaged compressor or turbine wheels
- Oil leaks
3. Install the New Turbo
Once you have confirmed the turbo is in good condition, proceed with the installation.
- Install the new gaskets on the manifold.
- Position the turbo and bolt it securely to the manifold.
- Reconnect the oil feed and return lines.
- Attach the intake and outlet pipes.
4. Check for Proper Alignment
Ensure that the turbo is properly aligned with the exhaust manifold and that all connections are secure. Misalignment can lead to performance issues and potential damage.
Final Steps
After the turbo installation, it is essential to perform a few final checks and adjustments.
- Check all connections for leaks.
- Ensure the oil lines are tight and secure.
- Reconnect the battery.
Tuning the Engine for Maximum Performance
With the new turbo installed, tuning the engine is crucial for maximizing performance and ensuring reliability. Consider the following:
- Use a quality engine management system.
- Adjust fuel maps to accommodate higher boost levels.
- Monitor air-fuel ratios for optimal performance.
Conclusion
Refitting a used Precision 71mm turbo in a Grand National can significantly enhance its performance, allowing for 450+ horsepower. By following the steps outlined in this article, you can ensure a safe and effective installation that maximizes your vehicle’s potential.