Tein Street Basis Z Coilovers

2011–2016 Scion tC2

GSQ30-8UAS2

Overview:

The Tein Street Basis Z Coilovers are a cost-effective suspension upgrade designed specifically for the 2011 to 2016 Scion tC2. These coilovers offer full height adjustability and utilize a twin-tube shock absorber design to provide a smooth, comfortable ride while enhancing handling performance. Ideal for enthusiasts seeking improved vehicle stance and road feel without compromising daily drivability, the Street Basis Z delivers reliable performance at an accessible price point.

Built with durability and ease of use in mind, this coilover kit maintains the use of your vehicle’s original upper mounts, ensuring a straightforward installation process. Whether navigating city streets or winding backroads, these coilovers provide consistent damping and ride quality across a variety of driving conditions.

Key Features:

The Tein Street Basis Z Coilovers combine innovative engineering with practical features to enhance your Scion tC2’s suspension performance:

• Full ride height adjustability: Front range from -3.9 to -1.5 inches (-99 to -38 mm), rear range from -4.3 to -1.4 inches (-108 to -36 mm)
• Twin-tube shock absorber design for longer stroke and reduced repulsive force, resulting in superior ride comfort
• OEM front and rear upper mounts retained for compatibility and ease of installation
• Cold-formed SAE9254 steel springs with high tensile strength (minimum 200 kgf/mm²) for excellent sag resistance and durability
• Durable TEIN-green powder coating with patented 2-layer, 1-bake anti-rust finish for outstanding corrosion resistance
• Unique ZT Coating on adjustment threads to prevent abrasion and corrosion, ensuring smooth ride height changes over time
• High-performance damper oil with stable viscosity and anti-foaming properties for consistent damping under varied temperatures and driving conditions
• Optimal dust boots protect piston rods from damage and contamination, enhancing longevity
• Spring rates optimized for balanced handling: 336 lbs/in (6 kgf/mm) front, 504 lbs/in (9 kgf/mm) rear

Construction & Design:

The Street Basis Z coilovers feature a sealed twin-tube structure that simplifies manufacturing while maintaining high-quality performance. The top of the shock absorber shell is narrowed and sealed by crimping metal after oil and gas injection, reducing production costs without sacrificing durability. This design allows for a longer suspension stroke and smoother operation compared to traditional mono-tube shocks.

Springs are crafted from SAE9254 steel, known for its high tensile strength and resistance to sagging, and finished with a robust powder coating that resists peeling and flaking. The coilover’s ride height adjustment threads receive TEIN’s proprietary ZT Coating, providing exceptional abrasion resistance and corrosion protection, even in harsh environments such as coastal or snowy regions.

Installation & Fitment:

Designed to fit the 2011–2016 Scion tC2, the Street Basis Z coilovers utilize the vehicle’s original upper mounts, which are not included in the kit. Installation involves replacing the factory shocks and springs with the coilover assembly, allowing for straightforward height adjustment by moving the lower spring seat. No additional modifications are typically required, making this an accessible upgrade for enthusiasts with basic mechanical skills or professional installers.

What's Included:

• Front and rear coilover assemblies with twin-tube shock absorbers
• Adjustable lower spring seats for ride height tuning
• Front and rear springs with specified spring rates
• Protective dust boots on shock piston rods
• Installation hardware (where applicable)

Ideal For:

The Tein Street Basis Z Coilovers are perfect for Scion tC2 owners seeking an affordable suspension upgrade that improves handling, ride quality, and vehicle stance. They are well-suited for daily driving, spirited street use, and enthusiasts who want a reliable, adjustable coilover without the premium price tag of high-end models.

TEIN is a Japan-based suspension brand offering high-performance coilovers, lowering springs, and motorsport-oriented damping solutions for street, track, and even gravel/rally-style applications. Known for broad vehicle coverage and enthusiast-friendly tuning options, TEIN is a go-to when you want sharper handling, improved stance, and adjustable control without jumping straight to full race hardware.