Tein Street Basis Z Coilovers

2005–2010 Scion tC

GSL52-8USS2

Overview:

The Tein Street Basis Z Coilovers are a cost-effective suspension upgrade designed specifically for the 2005 to 2010 Scion tC. Engineered to provide full height adjustability and enhanced ride quality, these coilovers offer an excellent balance between performance and comfort for daily driving and spirited street use. Featuring twin-tube shock absorbers, the Street Basis Z kit delivers smooth damping and improved handling without sacrificing ride comfort, making it an ideal choice for enthusiasts seeking reliable suspension enhancement at an affordable price point.

With a focus on durability and ease of use, this coilover kit retains the vehicle’s original upper mounts for a straightforward installation process. It is perfect for drivers who want to lower their Scion tC while maintaining a compliant and controlled ride on a variety of road surfaces.

Key Features:

The Tein Street Basis Z Coilovers combine innovative design with practical features to enhance your Scion tC’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
• Durable cold-formed springs made from SAE9254 steel with high tensile strength to resist sagging and maintain performance
• High-performance damper oil that maintains stable viscosity across a wide temperature range and resists cavitation and deterioration
• Optimized dust boots protect piston rods from damage and contamination, enhancing longevity
• Tein’s patented two-layer, one-bake powder coating in signature green for superior corrosion resistance and durability
• Unique ZT Coating on ride height adjustment threads to prevent abrasion and rust, ensuring smooth adjustability over time
• Spring rates tuned for balanced handling: 336 lbs/in (6 kgf/mm) front and 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 pipe is narrowed and sealed by crimping after oil and gas injection, reducing production costs without compromising durability. This design allows for a longer stroke and smoother operation compared to traditional monotube shocks, delivering a comfortable yet controlled ride.

Springs are crafted from SAE9254 steel, known for its exceptional tensile strength and resistance to sagging. They are finished with a highly durable powder coating that prevents peeling and flaking, ensuring long-lasting rust protection. The shock absorber bodies are coated with Tein’s proprietary green powder paint, applied using a patented two-layer, one-bake process that creates a robust barrier against corrosion, even in harsh environments such as coastal areas or regions with heavy snowfall.

Installation & Fitment:

The Tein Street Basis Z Coilovers are designed for direct fitment on the 2005–2010 Scion tC, utilizing the vehicle’s original upper mounts (not included). Installation is straightforward, requiring no modifications to the chassis or suspension components. Ride height adjustments are made by moving the lower spring seat up or down, allowing drivers to dial in their preferred stance and handling characteristics with ease.

Note that these coilovers are not compatible with Tein’s EDFC electronic damping force controller, focusing instead on simplicity and affordability.

What's Included:

• Front and rear coilover assemblies with twin-tube shock absorbers
• Front and rear springs with specified spring rates
• Lower spring seats for ride height adjustment
• Dust boots for piston rod protection
• Installation instructions

Ideal For:

The Tein Street Basis Z Coilovers are ideal for Scion tC owners seeking an affordable suspension upgrade that improves handling and aesthetics without sacrificing ride comfort. They suit daily drivers who want a lowered stance and enhanced cornering stability, as well as enthusiasts looking for a reliable, durable coilover system for street performance. This kit is perfect for those who prefer a simple, no-fuss installation and value long-term durability backed by Tein’s engineering expertise.

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.