TEIN Street Advance Z4 Coilovers for Subaru Forester (2012-2018)
The Street Advance Z4 damper is the evolution of the popular Super Street coilover. Developed to provide an improved drivability and raised ride height, along with 16-stage damping force adjustment using Tein's new Advance Needle technology. This gives the driver the ability to fine tune damping force change. The shortened shell case design provides optimum damper stroke at lower than standard vehicle ride height. Vehicle ride height is adjustable via the ZT coated threaded sleeve and spring seats. Updated internal components and external coatings increase durability and product life. Street Advance Z dampers are great for daily and spirited use, for all types of drivers.
The TEIN Street Advance Z4 has been developed as a threading type ride height adjustment system. The ride height can be adjusted by moving the lower spring seat up or down. Its simple structure allows for easier handling. Standard ride height for TEIN Street Advance Z4 is set at 1 inch (approx. 25mm) higher than the original, to accommodate various driving scenes from streets to off-roading. TEIN Street Advance Z4 is designed and configured to be most suitable for the lifted height. Simply raising the standard height can lead to insufficient rebound stroke impairing the stability and also make the camber angle positive on strut suspensions. TEIN Street Advance Z4 is tested on each vehicle models to optimize the dimensions and settings, in order to secure sufficient strokes and to enable the best suited alignment.
Each TEIN Street Advance Z4 features 16-level damping force adjustment, for simultaneous adjustment of compression and rebound. This allows a driver to modify ride comfort and handling according to your preference, changing the properties of the shock absorber with the adjustment dial.
The TEIN Street Advance Z4 are made with a Hydraulic Bump Stopper (H.B.S) that provides increased comfort and height durability at the maximum passenger or cargo load. When regular shock absorbers fully stroke, their bump rubbers are compressed. When the energy that is generated by this compression is released it can disturb the vehicle's behavior. Furthermore, repeated full strokes can damage the damper. In the same situation EnduraPro, featuring H.B.S., internally convert the impact of the stroke to thermal energy (heat) and absorb it, strongly reducing the impact that disturbs the vehicle's behavior. With less damage to the dampers, H.B.S. also contributes to their durability. In shock absorbers with inactive or no H.B.S., the operative valve (green) floats, and oil flows freely through the base valve ports. Resistance to the flow from the shim stack then causes damping force. Near full compression, when the piston rod strokes beyond a predetermined point, the operative valve is pushed down and activates H.B.S.: the base valve ports are narrowed, blocking the oil flow. This results in high damping force. A relief valve serves to suppress sudden damping force increase when the pressure in the cylinder exceeds its regular level. The setup of the H.B.S. mechanism is optimized per vehicle model, with the right activation point and damping force.
Features
- Steel Construction
- Twin Tube internal construction
- Larger piston diameter for strut type front and rear (22mm)
- 16-way Damping adjustment with over 200% increase in damping force change.*
- Ride Height adjustable via spring seat
- Powder coated damper body
- Non-welded ZT coated Adjustment Tube
- Full-Length Dust Boots
- 1-piece Aluminum Spring Seat with Delrin Thrust Washer
- Available for Overhaul
Specifications
| Front | Rear | |
| Damping Force Adjustment: | Yes | Yes |
| Ride Height Adjustable: | No | No |
| Upper Mounts: | OEM | OEM |
| Spring Rates (Kg/mm): | 5.0 | 5.0 |
| Ride Height Range (inches): | -0.4 to -1.7 | -0.7 to -1.7 |
Contents of Damper Kit
- 4 TEIN Coilover Shocks
- 4 TEIN Coilover Springs (no sag version)**
- 4 Rubber Bump Stops
- 2 Hook Spanners
- 4 Spring Seats
- 4 Spring Locks
- 4 Dust Covers (some kits reuse stock dust covers)***
- 4 Delrin Thrust Washers
- 1 TEIN Sticker Sheet****
- 1 Instruction Manual
**Some applications include helper springs
***Some kits will retain use of OEM Dust Covers Spring Seats × 4 Instruction Manual × 1
****(Note that Stickers do not come included for all JDM part numbers and for certain applications)
| MAKE | MODEL | CHASSIS | NOTE | YEAR | DRIVE SYSTEM | DISPLACEMENT |
| Subaru | FORESTER | SJG | 2.0XT, 2.0XT EYESIGHT | 2012.11-2018.06 | AWD | 2000 |
| Subaru | FORESTER | SJG | 2014-2018 | AWD | 2000 |
STREET ADVANCE Z4 has threading type ride height adjustment system.
The ride height can be adjusted by moving the lower spring seat up or down. Its simple structure allows for easier handling. Standard ride height for STREET ADVANCE Z4 is set at 1 inch (approx. 25mm) higher than the original, to accommodate various driving scenes from streets to off-roading.
STREET ADVANCE Z4 is designed and configured to be most suitable for the lifted height. Simply raising the standard height can lead to insufficient rebound stroke impairing the stability and also make the camber angle positive on strut suspensions.
STREET ADVANCE Z4 is tested on each vehicle models to optimize the dimensions and settings, in order to secure sufficient strokes and to enable the best suited alignment.
Making an Incredibly Low Price a Reality
About the Sealed Structure
The top end of the shell pipe is narrowed, oil and gas are injected, and the whole unit is sealed by crimping the metal.
This new approach massively shortens the production process. As a result, we have succeeded in vastly cutting production cost.
Partial Production Process of STREET ADVANCE Z and STREET BASIS Z
Twin-Tube A System
Compared to the regular mono-tube system, twin-tube attains longer stroke with a smaller repulsive force, resulting in high ride comfort.
Roads may have all sorts of surface conditions. This calls for shock absorbers with ample stroke, that operate smoothly. Thanks to this unique characteristic, you can negotiate gaps and bumps steadily on rough roads, meaning a smooth ride at low speed and stability at high speed.
The Hydraulic Bump Stopper (H.B.S.) Mechanism
In shock absorbers with inactive or no H.B.S., the operative valve (green) floats, and oil flows freely through the base valve ports. Resistance to the flow from the shim stack then, causes damping force.
Near full compression, when the piston rod strokes beyond a predetermined point, the operative valve is pushed down and activates H.B.S.: the base valve ports are narrowed, blocking the oil flow. This results in high damping force.
A relief valve serves to suppress sudden damping force increase, when the pressure in the cylinder exceeds its regular level.
The setup of the H.B.S. mechanism is optimized per vehicle model, with the right activation point and damping force.
Uses OE Mounts
STREET ADVANCE Z and STREET BASIS Z use the vehicle's original upper mounts (not included in our product kit).
High Durability & Reliability
Optimal Dust Boot
Thanks to its smooth compression and high durability, the dust boot guards the piston rod from damage, and keeps foreign material out of the shock absorber. (Some vehicles use their OE dust boots)
No-Sag Spring
Cold formed with SAE9254 steel (minimum tensile strength 200 kgf/mm2), our springs are outstandingly sag-proof and boast extreme resiliency. Superior rust protection is ensured with a highly durable powder coating that does not peel or flake. Our high-quality springs can be used without worries, in any conditions.
High-Performance Damper Oil
Since TEIN's damper oil maintains a stable viscosity in a broad temperature range, it sustains smooth stroke and reliable damping force in a variety of circumstances.
Due to excellent anti-foaming properties, it's resistant to cavitation (bubble forming). Since it withstands high heat too, it's suitable for intense sport driving as well.
Furthermore, the damper oil keeps up its superior performance long-term, because it's resistant to deterioration over time.
Only STREET ADVANCE Z
Damping Force Adjustment
Modify ride comfort and handling according to your preference, changing the properties of the shock absorber with the adjustment dial.
The above are examples, actual settings vary according to the vehicle's circumstances.
