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Building a high-performance transmission upgrade for a Nissan GT-R can be a challenging yet rewarding endeavor, especially for drag racing enthusiasts looking to push their vehicles beyond 900 horsepower. This guide will take you through the essential steps to achieve a robust transmission setup that can handle the demands of high-speed racing.
Understanding the Basics
Before diving into the upgrade process, it’s crucial to understand the components involved in the GT-R’s transmission system and the specific requirements for drag racing.
- Transmission type: The GT-R typically uses a 6-speed automatic transmission.
- Power handling: Upgrading components to handle over 900 hp requires specific parts.
- Performance goals: Consider your drag racing objectives, such as ET and trap speed.
Required Tools and Equipment
Gathering the right tools and equipment is essential for a successful transmission upgrade. Here’s a list of what you will need:
- Torque wrench
- Socket set
- Transmission jack
- Fluid pump
- New transmission fluid
- Performance transmission parts
Step 1: Assess Your Current Transmission
Start by evaluating your existing transmission. Look for signs of wear and tear, leaks, and performance issues. This assessment will help determine what needs to be replaced or upgraded.
Step 2: Disassembly of the Transmission
Carefully disassemble the transmission to access internal components. Follow these steps:
- Drain the transmission fluid completely.
- Remove the transmission from the vehicle using a transmission jack.
- Take off the transmission pan and valve body.
- Inspect clutches, gears, and other internal components.
Step 3: Upgrading Internal Components
To handle 900+ hp, you will need to upgrade several internal components:
- Clutch Packs: Install high-performance clutch packs designed for increased power.
- Torque Converter: Upgrade to a higher stall torque converter for better launch performance.
- Gear Sets: Consider installing stronger gear sets to handle increased torque.
- Valve Body: Upgrade to a performance valve body for quicker shifts.
Step 4: Reassembly of the Transmission
Once all upgrades are complete, reassemble the transmission carefully:
- Reinstall the valve body and ensure all bolts are torqued to specification.
- Install the new clutch packs and ensure proper alignment.
- Reattach the transmission pan, ensuring a good seal.
Step 5: Reinstallation and Fluid Filling
With the transmission reassembled, it’s time to reinstall it into the vehicle:
- Carefully lift the transmission back into place using the transmission jack.
- Reconnect all electrical connections and linkages.
- Fill the transmission with new high-performance fluid.
Step 6: Testing the Setup
After installation, it’s important to test the transmission to ensure everything is functioning properly:
- Start the engine and let it warm up.
- Check for leaks and ensure fluid levels are correct.
- Perform a series of test runs to assess performance and shifting.
Conclusion
Upgrading your GT-R’s transmission for drag racing is a complex process that requires careful planning and execution. By following this step-by-step guide, you can create a powerful transmission capable of handling over 900 horsepower, enhancing your drag racing experience.