Tein GSM64-8USS2 Street Basis Z Coilover Suspension Kit User Manual for Mazda Miata

1. Introduction

This manual provides essential information for the installation, operation, and maintenance of the Tein Street Basis Z Coilover Suspension Kit, model GSM64-8USS2. This kit is designed to enhance the suspension performance and adjustability of specific Mazda Miata models. Please read this manual thoroughly before attempting any installation or adjustment to ensure proper function and safety.

The Tein Street Basis Z series features a fully sealed damper structure and thread-type adjustable twin-tube design, offering a balance of performance and durability. It is designed for use with original equipment (OE) mounts and is not compatible with Electronic Damping Force Controller (EDFC) systems.

2. Safety Information

Warning: Improper installation or adjustment of suspension components can lead to serious injury or vehicle damage. Professional installation by a qualified technician is highly recommended.

• Always use appropriate safety equipment, including eye protection and gloves.
• Ensure the vehicle is securely supported on jack stands or a lift before working underneath it. Never rely solely on a jack.
• Do not use impact tools on moving suspension components unless specifically instructed.
• Verify all fasteners are tightened to the manufacturer's specified torque settings.
• After installation, perform a wheel alignment to ensure correct vehicle handling and tire wear.
• This product contains chemicals known to the State of California to cause cancer and birth defects or other reproductive harm (Proposition 65 warning). Handle with care and wash hands after contact.

3. Package Contents

The Tein Street Basis Z Coilover Suspension Kit typically includes the following components:

• Four (4) Coilover Damper Units (front and rear specific)
• Four (4) Main Springs (pre-installed on damper units)
• Four (4) Dust Boots (some vehicles may reuse OE dust boots)
• Adjustment Wrenches (for ride height adjustment)
• Instruction Manual (this document)

Figure 3.1: Overview of the Tein Street Basis Z Coilover Suspension Kit components. This image displays four green coilover units, along with black dust boots and silver top hat components, illustrating the complete kit.

4. Setup and Installation

This section outlines the general steps for installing the Tein Street Basis Z Coilover Suspension Kit. Specific procedures may vary depending on the vehicle model. Always consult a service manual for your specific Mazda Miata year and model for detailed removal and installation instructions of original equipment components.

4.1 Vehicle Preparation

1. Park the vehicle on a level, stable surface.
2. Engage the parking brake.
3. Loosen the lug nuts on the wheels.
4. Safely lift the vehicle using a hydraulic jack and secure it with jack stands at appropriate lift points.
5. Remove the wheels.

4.2 Removal of Original Suspension

• Carefully disconnect any brake lines, ABS sensor wires, or other components attached to the original strut assembly.
• Remove the lower mounting bolts connecting the strut to the knuckle.
• Access the upper strut mounts from the engine bay (front) or trunk/rear interior (rear). Remove the nuts securing the top hat.
• Carefully remove the entire original strut and spring assembly from the vehicle.

4.3 Installation of Tein Coilovers

• Top Hat Modification: For some Mazda Miata models (e.g., '94 Miata as per user feedback), it may be necessary to enlarge the hole in the original top mounts to accommodate the larger diameter of the coilover shaft. This can be done using a file or drill. Ensure the hole is smooth and free of burrs.
• Install the Tein coilover assembly into the vehicle, aligning the top hat studs with the mounting holes. Secure with the original top hat nuts, tightening to factory specifications.
• Connect the lower mounting point of the coilover to the knuckle. Insert bolts and tighten to factory specifications.
• Reattach any brake lines, ABS sensor wires, or other components that were disconnected. Ensure they are routed correctly and not under tension.
• Repeat the process for all four corners of the vehicle.

4.4 Post-Installation

• Reinstall the wheels and tighten lug nuts to factory specifications.
• Lower the vehicle slowly and carefully.
• Bounce the vehicle a few times to allow the suspension to settle.
• Important: A professional wheel alignment is mandatory after installing new suspension components to prevent premature tire wear and ensure safe handling.

5. Operating and Adjustment

The Tein Street Basis Z coilovers allow for ride height adjustment. This adjustment is performed using the threaded body of the damper and the provided adjustment wrenches.

5.1 Ride Height Adjustment Procedure

1. Safely lift the vehicle and remove the wheels as described in Section 4.1.
2. Locate the lower spring seat and the locking collar on the coilover body.
3. Using the supplied wrenches, loosen the locking collar.
4. Rotate the lower spring seat to adjust the ride height. Turning it clockwise will lower the vehicle, and counter-clockwise will raise it.
5. Adjustment Ranges:
   • 1990-1998 Mazda Miata (NA6C and NA8C):
     • Front: -1" to -1.8" (Drop from OE: -1.4")
     • Rear: -0.8" to -1.6" (Drop from OE: -1.2")
   • 1999-2005 Mazda Miata (NB8C):
     • Front: -1.3" to -2.0" (Drop from OE: -1.6")
     • Rear: -1.2" to -2.0" (Drop from OE: -1.6")
6. Once the desired ride height is achieved, firmly tighten the locking collar against the spring seat to prevent it from moving.
7. Repeat for all four coilovers, ensuring consistent height settings across the axle (front left/right, rear left/right).
8. Reinstall wheels, lower vehicle, and perform a test drive. Re-check ride height after driving and adjust if necessary.

Note: Ride height adjustments can affect suspension travel and handling characteristics. Always ensure adequate clearance between tires and fenders, and between suspension components and the chassis.

6. Maintenance

Regular maintenance helps ensure the longevity and performance of your Tein coilovers.

• Regular Inspection: Periodically inspect the coilovers for any signs of damage, leaks, or loose components. Check dust boots for tears or cracks.
• Cleaning: Keep the coilover bodies and threads clean, especially after driving in harsh conditions (e.g., snow, salt, dirt). Use a mild soap and water solution. This prevents corrosion and ensures smooth future adjustments.
• Thread Lubrication: Apply a thin layer of anti-seize lubricant to the threaded sections of the coilover body during installation and periodically thereafter to prevent seizing and facilitate easier height adjustments.
• Torque Check: Re-check the torque of all mounting bolts and nuts after the first 500 miles of driving and periodically thereafter.
• Dust Boots: The included dust boots are designed to protect the piston rod from damage and keep foreign material out of the shock absorber. Ensure they are properly seated and intact.

7. Troubleshooting

This section addresses common issues that may arise with coilover suspension systems.

• Unusual Noises (e.g., clunking, rattling):
  • Check all mounting bolts and nuts for proper torque.
  • Inspect for any loose components or contact between the coilover and other vehicle parts.
  • Ensure the locking collars are securely tightened against the spring seats.
  • Verify that the top hats are correctly installed and not causing interference.
• Uneven Ride Height:
  • Re-measure the ride height at all four corners and adjust as necessary (refer to Section 5.1).
  • Ensure the vehicle is on a level surface when measuring.
• Poor Ride Quality (e.g., too bouncy, too stiff):
  • While the Street Basis Z series is not damping adjustable, extreme ride height settings can impact ride quality. Ensure the ride height is within the recommended adjustment range.
  • Verify tire pressure is set correctly.
  • If ride quality is significantly compromised, consult with a suspension specialist.
• Premature Tire Wear:
  • This is often an indication of incorrect wheel alignment. Ensure a professional alignment has been performed after installation and any significant ride height changes.

8. Specifications

9. Warranty and Support

For specific warranty terms and conditions, please refer to the official Tein website or contact your authorized Tein dealer or the seller directly. Warranty coverage typically applies to manufacturing defects and does not cover damage due to improper installation, misuse, or normal wear and tear.

For technical support, installation assistance, or inquiries regarding your Tein Street Basis Z Coilover Suspension Kit, please contact Tein customer service or your product retailer.

• Manufacturer: Tein
• Website: www.tein.com (Please verify the official website for the most current information)