Acura NSX Auto to Manual Conversion

The Acura NSX automatic to manual transmission conversion is a popular modification that transforms the driving experience by replacing the factory automatic transmission with a manual gearbox. This comprehensive guide covers the conversion process, required parts, tools, installation steps, and important considerations for successfully completing this modification on your Acura NSX.

Conversion Overview

The automatic to manual conversion involves replacing the entire transmission system, including clutch components, shift linkage, and related electronics to achieve proper manual transmission functionality.

Required Parts List

Essential components needed for a complete automatic to manual conversion.

1. Manual Transmission Assembly (complete)
2. Clutch Kit: Pressure plate, clutch disc, release bearing
3. Flywheel (manual specific)
4. Clutch Pedal Assembly with master cylinder
5. Slave Cylinder and hydraulic lines
6. Shift Lever and Linkage Assembly
7. Transmission Mount and Crossmember
8. Drive Shaft (manual version)
9. ECU or ECU modification kit
10. Wiring harness adapters

IMPORTANT! Ensure all parts are compatible with your specific NSX model year.

Tools and Equipment

Specialized tools required for proper conversion installation.

1. Transmission Jack and Engine Support
2. Complete Socket Set (metric)
3. Torque Wrench
4. Clutch Alignment Tool
5. Bleeding Kit for Hydraulic System
6. Electrical Test Equipment
7. Lift or Jack Stands
8. Transmission Fluid Pump
9. ECU Programming Software

CAUTION! Use proper safety equipment and follow all workshop safety procedures.

Pre-Conversion Preparation

• Vehicle Assessment: Check current transmission condition and vehicle readiness.
• Parts Verification: Confirm all required parts are available and compatible.
• Workspace Setup: Ensure adequate space and proper equipment access.
• Documentation: Gather service manuals and wiring diagrams.
• Time Allocation: Plan for 15-25 hours depending on experience level.
• Fluid Drainage: Prepare to drain transmission and cooling fluids.
• Battery Disconnect: Remove battery to prevent electrical issues.

Removal Process

Step-by-step procedure for removing automatic transmission components.

1. Disconnect battery and drain transmission fluid
2. Remove exhaust system and heat shields
3. Disconnect drive shafts and half shafts
4. Remove transmission cooling lines and electrical connectors
5. Support engine and remove transmission crossmember
6. Lower automatic transmission using transmission jack
7. Remove torque converter and flex plate
8. Disconnect shift cable and neutral safety switch

WARNING! Transmission is heavy; use proper lifting equipment and assistance.

Installation Steps

Installing manual transmission components and related systems.

1. Install manual flywheel and torque to specification
2. Mount clutch assembly using alignment tool
3. Install manual transmission with new mounts
4. Connect drive shafts and half shafts
5. Install clutch pedal assembly and hydraulic system
6. Connect shift linkage and adjust properly
7. Install new transmission fluid and bleed hydraulic system
8. Reconnect exhaust and heat shielding

Tip: Double-check all torque specifications and fluid levels.

Wiring and Electronics

Electrical modifications required for proper manual transmission operation.

ECU Programming: Reprogram ECU to disable automatic transmission controls and enable manual operation. Bypass neutral safety switch and reverse lockout systems.

Wiring: Modify harness for clutch pedal position sensor, reverse lights, and speed sensor compatibility. Install manual transmission speed sensor and connectors.

Testing and Calibration

Post-installation verification and adjustment procedures.

1. Clutch pedal free play adjustment
2. Gear shift linkage alignment
3. Hydraulic system bleeding and pressure testing
4. Reverse light switch operation verification
5. ECU communication and error code check
6. Test drive: gear engagement and clutch operation
7. Final torque check on all critical components

WARNING! Complete thorough testing before normal driving operation.

Common Challenges

Frequently encountered issues during conversion and solutions.

Cost Analysis

Estimated costs for automatic to manual conversion components and services.

• Manual Transmission: $2,500 - $4,000 (used)
• Clutch Kit: $400 - $800
• Pedal Assembly: $300 - $600
• Miscellaneous Parts: $500 - $1,000
• Professional Labor: $1,500 - $3,000
• ECU Programming: $200 - $500

Total Estimated Cost: $5,400 - $9,900

Professional Services

Recommended specialists for Acura NSX transmission conversions.

ScienceofSpeed: Comprehensive NSX conversion services and parts. SOS Performance: Specialized NSX transmission work and ECU programming. Acura dealerships with NSX certification. Independent NSX specialists with conversion experience.

Contact: ScienceofSpeed: (480) 233-8870, www.scienceofspeed.com

Support: NSX Prime Forum: Technical support and community assistance