Coilovers.com is an authorized USA dealer for TEIN. We carry the active TEIN range. The lineup includes Street Basis Z, Street Advance Z, Flex Z, RX1, Mono Sport, Flex AVS, and Flex A. We also carry the EDFC Active Pro and EDFC5 Active Pro electronic damping controllers for the lines that support them. Call us at 1-800-460-9106 to talk through your build.
TEIN is a Japanese suspension brand with platform-specific application engineering for Japanese chassis. The lineup runs from entry-level street kits through track-focused systems. Twin-tube damper design is consistent across the ladder. This page covers every active TEIN option, the EDFC controllers, the Type R fitment specifics, and how the brand sits within the wider portfolio of brands we carry.
Why Drivers Choose TEIN USA Coilovers
TEIN engineers and manufactures performance suspension in Japan. Each model is developed for specific Japanese chassis platforms. Damping force is calibrated to the spring rate, so the suspension stays planted without going harsh. This damping-matched-to-spring-rate philosophy is the foundation of the lineup. It is what keeps a Flex Z compliant on a daily commute and confident on a back road, with the same kit.
The active range is engineered for owners of Japanese performance cars. Honda, Acura, Toyota, Lexus, Scion, Nissan, Infiniti, Mitsubishi, Subaru, and Mazda customers make up the bulk of our TEIN orders. The platform-specific engineering means the kit for an EK Civic, an FD3S Mazda RX-7, or a GD Impreza has been developed against that chassis. It is not adapted from a generic application. The Mazda Miata, the Mazda RX-7, and the Mazda 3 platforms all see strong TEIN order volume, particularly on Flex Z applications.
Most adjustable lines offer 16 stages of damping force adjustment. This lets a driver run a comfortable cruise setting on weekday commutes and a firmer setup for spirited driving. The same coilover kit covers both use cases. TEIN kits improve handling by lowering the center of gravity and reducing body roll. Adjustability is calibrated for street and track use. The shock and spring assembly sharpens steering response and turn-in by tightening damping control. The driver gets more feedback through the chassis. For owners who want to lower the car cleanly without sacrificing daily comfort, the brand covers the use case directly.
The brand's motorsport involvement runs through the engineering. TEIN competes in motorsport events around the world, and what comes back from competition feeds the production lineup. Coilovers.com customers benefit from that. Product quality holds up across the ladder. Warranty contact volume stays low. The kits hold up across multiple years of street driving. Customer driving impressions tend to focus on two things. The matched damping does not go harsh. The long-term feel does not fade after a season. The biggest benefit owners cite is that the kit feels right from the first drive and stays that way for years.
The TEIN Coilover Lineup
The active TEIN range carried at Coilovers.com runs from entry-level street kits through track-focused systems. Some kits within the lineup are engineered for JDM-market platforms and reflect that origin in the chassis-specific design. The seven lines below are what we stock and ship. The broader TEIN catalog includes purpose-built track and motorsport lines such as Mono Racing and Super Racing that we do not currently list, because the target platforms are rare in North America and the price-to-application match does not fit our typical customer.
Tein Street Basis Z
The Street Basis Z is the entry point in the TEIN ladder for street-driven cars. Each kit uses the brand's twin-tube damper design. Height adjusts 1 to 3 inches through the shock body. The Street Basis Z does not offer damping force adjustment. The kit ships without upper mounts. No-sag springs and high-performance damper oil keep the system stable across daily use. The shock bodies carry a coating that resists rust and rock-debris damage. The Street Basis Z is the right starter kit for an owner who wants the brand's ride character at the lowest price point in the active range.
Tein Street Advance Z
The Street Advance Z carries the same twin-tube damper, height adjustment range, no-sag springs, and protective shock-body coating as the Street Basis Z. It adds two features that change how the car can be tuned. Sixteen clicks of damping force adjustment let the driver dial in compression and rebound. EDFC compatibility lets the same kit run a TEIN Electronic Damping Force Controller for in-cabin damping changes. Like the Street Basis Z, the Street Advance Z does not include upper mounts.
Tein Flex Z Coilovers
The Flex Z is the volume seller in the active range and the kit most Coilovers.com customers order. It runs a twin-tube damper with full-length adjustability through the threaded body design. The threaded body lets separate spring preload and ride height adjust independently of each other. The driver can drop the car without compressing the coils into a stiffer-than-intended response. Sixteen clicks of damping force adjustment, EDFC compatibility, high-performance damper oil, no-sag springs, and the rust-and-debris-resistant shock-body coating are all standard. Most Flex Z applications include reinforced rubber upper mounts or pillow ball mounts. Pillow ball mounts add front camber adjustment on the variants that include them. Some applications use OEM upper mounts where the chassis design allows.
The Flex Z is engineered as a sealed, non-rebuildable system. The damper bodies are fully sealed and require no internal service over the kit's useful life. This design choice matches how most Flex Z buyers actually use the kit. They run multiple years of daily and spirited driving, then renew rather than rebuild. At the Flex Z price point, full renewal is generally the more cost-effective path. TEIN's overhaul service remains available for the lines that support it.
Tein Flex A
The Flex A builds on the Flex Z platform and adds a hydraulic bump stopper mechanism (H.B.S.) to the damper assembly. The H.B.S. system absorbs sharp impacts at the end of damper travel. Speed bumps, road seams, and mid-corner ruts get converted into smoother body motion. The Flex A retains the Flex Z's full-length adjustability, 16-click damping, EDFC compatibility, and twin-tube design. The kit sits at a higher price point than the Flex Z. It is the right step up for drivers who want the Flex Z feature set with refined ride quality on rough roads.
Tein Flex AVS
The Flex AVS is the premium variant in the Flex platform. It combines the H.B.S. system with additional refinements for drivers who run their cars hard on imperfect surfaces. Like the Flex A, the Flex AVS is full-length adjustable, 16-click damping, EDFC compatible, and twin-tube. Drivers who want the broadest envelope of the Flex platform are the typical Flex AVS buyer. The use case includes comfortable cruising, confident spirited driving, and absorbed impact behavior on rough roads.
Tein RX1
The RX1 is the highest-performance street system in the active Flex platform. It carries the H.B.S. hydraulic bump stopper, 16-click damping force adjustment, full-length adjustability, EDFC compatibility, and the twin-tube damper design that defines the Flex range. The RX1 is the kit TEIN engineers for the Honda Civic Type R FK8 (2017-2021) and the FL5 (2023+). The same RX1 part fits both chassis. The Type R model line skipped a production year between them. The RX1 is available across additional Honda and Acura applications. It is the recommended Type R kit when the build prioritizes spirited street driving with occasional track use.
Tein Mono Sport
The Mono Sport is the circuit-oriented kit in the active range. It runs higher spring rates, firmer damping, and a construction philosophy aimed at entry-to-mid-level track use. The Mono Sport is engineered for several JDM-market Honda and Acura platforms. These include the Acura/Honda Integra Type R DC2 (1997-2001) and the Acura/Honda NSX-R. These applications are designed for the JDM chassis specifically. The Mono Sport is the right choice for owners who want a kit calibrated for circuit work and accept the firmer character that comes with circuit-focused damping.
TEIN Flex Z Deep Dive: How Flex Z Coilovers Earn Their Reputation
Flex Z coilovers are the most popular product in the active range. The reason is structural. Flex Z coilovers land the full TEIN Flex feature set at a price point that makes the coilover kit accessible to a wide group of buyers. Twin-tube damper, full-length adjustability, 16-click damping, EDFC compatibility, upper mounts on most applications, sealed maintenance-free design. Most Coilovers.com TEIN orders are Flex Z coilover kits. The Flex Z coilover kit replaces the OEM struts as a complete spring-and-damper assembly rather than a strut-only swap.
The twin-tube damper design is the foundation of the TEIN Flex platform. A twin-tube damper uses an inner working tube surrounded by an outer reservoir tube. This gives the damper a longer effective stroke than a comparable monotube damper of the same length. Longer stroke means the suspension can absorb uneven road surfaces while keeping the wheel in contact with the road. Compare TEIN Flex Z coilovers against an OEM strut, where damping force and spring rate are fixed by the manufacturer. TEIN Flex Z coilovers calibrate damping force to the spring rate of each application. This prevents the bouncy ride that comes from oversprung or undersprung kits, and it lets the coils, the upper mount, and the damper work together as a matched assembly.
Full-length adjustability is the key tuning advantage of TEIN Flex Z coilovers. The spring perch and the lock collar adjust independently. Height changes do not preload the coils into a stiffer-than-intended response. Lowering springs on OEM struts cannot do this. The spring is simply shorter, and the OEM strut geometry compensates poorly. The Flex Z coilovers' full-length design lets the driver drop the car without losing the engineered damping behavior. The same coilover kit covers a range of ride heights without re-valving. Flex Z coilovers and Flex AVS coilovers both share this full-length design.
Sixteen clicks of damping force adjustment let the driver tune compression and rebound damping for road conditions, driving style, or seasonal changes. The factory recommended starting position is documented in the brand's setup notes. From there, drivers typically adjust a click or two firmer for spirited driving. They go a click or two softer for long-haul comfort. The TEIN Flex setup procedure is documented per application.
EDFC compatibility is the TEIN Flex feature that drivers extend most often after install. Flex Z coilovers are compatible with TEIN's optional Electronic Damping Force Controllers. These let damping adjustments happen from inside the car while driving. The EDFC system can save multiple presets. The newer EDFC5 Active Pro adjusts damping automatically based on G-forces and speed inputs. The TEIN Flex platform is engineered to integrate with EDFC at the damper level, so retrofit installs are straightforward.
Flex Z coilovers are engineered as a fully sealed, non-rebuildable system. This is a deliberate engineering choice rather than a limitation. The sealed design protects the internal damper components from contamination. It holds the calibrated damping characteristics across the kit's useful life. The design matches how most Flex Z owners actually use the coilover kit. They run multiple years of street and spirited driving, then renew rather than rebuild.
EDFC: Damping Adjustment from the Driver's Seat
The EDFC system, short for Electronic Damping Force Controller, lets a driver adjust damping stiffness from inside the car while driving. Manual damping adjustment requires turning a knob at the strut. That usually means stopping the car and reaching into the wheel well. EDFC replaces that with small motors at each damper. The motors respond to inputs from a controller mounted near the steering wheel. The driver can soften the damping for a long highway run or firm it up for an on-ramp, all without stopping. The motors at each corner are sometimes called actuator motors in technical documentation.
Coilovers.com offers the two current EDFC controller systems:
- EDFC Active Pro. The established TEIN electronic damping controller. It supports multiple-preset save capability and manual or basically automatic damping change response.
- EDFC5 Active Pro. The newer system. It adds automatic damping adjustment based on external inputs from G-force and speed sensors. The EDFC5 reads how the car is moving and changes damping in response. This matters most for drivers who switch between street and track conditions in the same drive.
The TEIN coilover lines that support EDFC compatibility are: Flex Z, Flex A, Flex AVS, RX1, Mono Sport, Street Advance Z, and Street Basis Z. The Flex Z is the most common pairing. Most Flex Z buyers already own the kit that delivers the broadest EDFC value. It is a full-feature street coilover that benefits directly from in-cabin damping changes during daily driving.
EDFC is the right add-on for drivers who tune their suspension regularly. It is honestly less useful for a set-and-forget owner who picks a damping setting at install and never touches it again. For drivers who run street settings during the week and firmer settings on weekends, EDFC turns a five-minute trip into the wheel well into a steering-wheel-mounted button press.
To order EDFC Active Pro or EDFC5 Active Pro, see EDFC Active Pro. Or call 1-800-460-9106 for help choosing the right controller for your TEIN kit.
Real Customer, Real Story: Mac Hyppolite Jr.'s 2021 TEIN Install on a Right-Hand-Drive Honda CR-X
In 2021, Mac Hyppolite Jr. ordered a TEIN coilover suspension and a Skunk2 camber kit from Coilovers.com for his right-hand-drive Honda CR-X imported from Japan. The order went in on a Thursday and arrived Saturday. Mac documented the unboxing, the packaging, and his decision-making in the video below.
Mac is known in the cycling community as the Day Walker for his long-distance charity rides supporting St. Jude Children's Research Hospital. His hometown of Bloomfield, New Jersey honored his charity work with a community memorial. The cycling and the CR-X are both passions. The CR-X became part of his story when he chose Coilovers.com for the suspension build on a rare JDM import.
Coilovers.com owner Lou Tortola personally consulted with Mac on the right setup for the CR-X chassis before the order was placed. Five years on, Lou and Mac remain in regular contact through social media and continue to follow each other's posts. Cycling rides, street photography, and the ongoing CR-X build all stay part of the conversation. This is one customer story. It stands as one example of the kind of customer relationships Coilovers.com builds and maintains with the people we serve.
Type R Fitment Notes: Honda Civic Type R, Integra Type R, NSX-R
Type R fitment is one of the more common platform-specific questions Coilovers.com receives on TEIN. The active range covers three Type R chassis at the kit level, with a fourth chassis sharing parts with one of the listed kits.
The Honda Civic Type R FK8 (2017-2021) uses the TEIN RX1 coilover kit. The Honda Civic Type R FL5 (2023+) uses the same RX1 part. The Type R model line skipped a production year between the FK8 and the FL5. The same RX1 fits both Civic chassis. The FL5 has its own product listing on Coilovers.com so 2023+ Civic Type R owners can find the kit directly. For broader Civic-platform fitments outside the Type R chassis, see our full Honda coilover collection.
The Acura/Honda Integra Type R DC2 (1997-2001) uses the TEIN Mono Sport kit. The DC2 Mono Sport is engineered for the JDM-market Integra Type R platform.
The Acura/Honda NSX-R uses the TEIN Mono Sport. Like the DC2, the NSX-R Mono Sport is engineered for the JDM-market chassis.
Some Type R kits in the range are designed for JDM-market platforms specifically and carry that origin in the engineering. Customers ordering for a North American build should call 1-800-460-9106 for fitment confirmation against the specific chassis. Confirmation matters most for the JDM-platform Mono Sport applications.
Lowering Springs vs TEIN Coilover Kits: Which Suits Your Build?
Lowering springs and a TEIN coilover kit solve different problems. The right choice depends on what the build needs and what comes next.
Lowering springs replace the stock coil springs with shorter, often stiffer coils. They lower ride height while keeping the stock struts and dampers in place. Lowering springs are inexpensive, install quickly, and produce a cleaner stance. They do not change damping behavior. They do not allow ride height adjustment. They do not give the driver a way to fine-tune the suspension after install. Stiffer coils on stock struts can also wear those struts faster. The stock struts are now controlling stiffer coils than they were engineered for. A blown stock strut is a real risk on this setup over enough miles. Front struts and rear struts wear at different rates depending on weight distribution.
A TEIN coilover kit replaces the entire spring-and-damper assembly. The new system includes purpose-built coils paired to the new shock and damper. Ride height adjusts through the spring perch position. Damping adjustment is available on most TEIN lines. Damping force is calibrated to the spring rate, so the system works as a matched set. The cost is higher than lowering springs and meaningfully higher than cheap coilovers from unbranded sources. The install takes longer than swapping out stock dampers for lowering springs. The result is a fully tunable suspension that can change with the build over time. Drivers who tried cheap coilovers first and were unhappy with the ride quality consistently report TEIN as the upgrade that fixed the issue.
Lowering springs are the right choice when the goal is a modest cosmetic drop on a daily driver to close some wheel gap. Budget is constrained. The build has no track or autocross aspirations. A TEIN coilover kit is the right choice when handling improvement matters. Track use is possible. Custom ride height is desired. The driver wants to fine-tune ride compliance over time. Flex Z coilovers are the most common coilover kit choice for this use case at Coilovers.com.
Coilover Maintenance: Annual Inspections and Long-Term Care
TEIN kits are durable systems with low long-term contact volume. They benefit from annual inspections to maintain performance over multiple years of driving. The inspection rhythm matters most in regions with harsh winters or salt-treated roads.
Regular maintenance includes checking the external components for wear and tear. The components to inspect are the seat locks, the spring seats, the dust boots, and the bump stops. The seat locks are the lock collars that hold the spring perches in position. The spring seats are the upper and lower spring contact surfaces. The dust boots are the rubber covers over the damper shafts that keep dirt and moisture out. Cracked dust boots let contaminants reach the damper shaft. The bump stops are the rubber or urethane stops that limit damper travel. Worn seat locks can let the spring perch shift. Damaged dust boots accelerate seal wear. Compressed bump stops change the end-of-travel behavior. Inspect the upper mount, the lower mount, and the strut-tower mount on each corner during the annual check.
In snowy areas or regions that use road salt, inspect the front and rear corners before and after the winter season to prevent corrosion. Salt accelerates rust on shock bodies, threads, and lock collars. A pre-winter and post-winter inspection routine catches early corrosion before it reaches the damper internals. The rear corners typically need the closest look during these inspections, since road spray accumulates fastest on rear shock bodies. Check rear damper bodies and rear lock collars first, then move to the front.
The Flex Z and other sealed systems are not designed for internal rebuild service. At the Flex Z price point, full replacement every several years is generally more cost-effective than chasing rebuild service on a sealed unit. For lines that support overhaul, TEIN offers a service program at tein.com/service. Coilovers.com customers who want overhaul service for a supported kit can contact us. We will help coordinate.
Installing Your TEIN Coilover Kit
The install follows the standard coilover procedure, with a few brand-specific points worth flagging. Drivers comfortable with chassis work and torque-spec discipline can fit the kits in a home garage. Drivers who want a professional fit should call 1-800-460-9106 for a referral to one of our trusted shops.
Before starting the fit, take inventory of all components against the parts list in the instruction manual. The kit should include the four damper assemblies, the springs, the upper mount and lower mount hardware on applications that ship with mounts, the lock collar adjustment tool, and the install hardware. The springs come pre-installed on the dampers in most cases. Each upper mount on a Flex Z application includes the bearings or bushings called out in the parts list. Confirming inventory before the car is in the air prevents discovering a missing component mid-fit. Once installed, the kit should match the parts list exactly, with all hardware torqued to the values published in the instruction manual.
When fitting the coilover kit, load the suspension prior to tightening any nuts or bolts on the bushing-mounted components. Tightening with the suspension hanging at full droop preloads the bushings into a position that does not match the car's normal stance. This can lead to uneven height after the car settles. It can also cause bushing wear over time. The fix is to lower the car onto the wheels or onto stands at the new ride height. Let the suspension settle. Then torque the bushing-mounted bolts.
Some applications include left-hand threaded components, particularly on certain spring perches and lock collars. Identify these before applying force in the wrong direction. Standard right-hand threads tighten clockwise. Left-hand threads tighten counterclockwise. The instructions for each application call out the left-hand thread locations. Putting a wrench the wrong way on a left-hand thread is one of the more common mid-install errors. Driving the wrong screw or bolt into a left-hand fitting can damage the threads. Check the instructions before each fitting. The damper bodies should be free of marks at this stage; any visible damage to damper bodies during install means a callback to Coilovers.com before proceeding.
On Flex Z and other applications that include pillow-ball upper mounts with front camber adjustment, set the camber to the factory neutral position before starting. Complete the alignment after the car has settled at the new height. Factory hardware that mounts to OEM points should be retained where the instructions specify. Aftermarket hardware that came with the kit replaces OEM where called out. Use the correct screw and bolt grades, and torque each to the published spec. After the kit is fitted, drive the car gently for several miles to let the springs and bushings settle. Then re-torque the critical bolts and book a four-wheel alignment.
Ride Height and Damping Adjustment
TEIN kits separate ride height adjustment from damping adjustment. This is one of the core advantages of the full-length design. Each adjustment affects different aspects of how the shock and spring assembly behaves on the road.
Adjusting ride height involves changing the position of the spring perch on the shock body. This affects the car's center of gravity and handling balance. On full-length adjustable kits like the Flex Z, the spring perch and lock collar move together. They set height without changing the separate spring preload setting. On shock-body-only adjustable kits like the Street Basis Z, height changes happen through the lower mount position. The lower the car, the lower the center of gravity and the less body roll under cornering loads. The limit comes when suspension travel runs out.
Damping adjustment lets drivers fine-tune the suspension's response to road conditions. Most adjustable lines offer 16 clicks of damping force adjustment that affect both compression and rebound damping. Compression damping controls how the suspension responds when the wheel moves up over a bump or into a corner. Rebound damping controls how the suspension extends back to set height after the bump. The relationship between the two determines whether the car feels controlled or floaty over a series of road inputs. The valve internals on each damper are calibrated for that compression-rebound balance, which is part of why the kits respond consistently across the click range.
Tuning approach: start at the recommended baseline for the application. Then adjust a click at a time. For street tuning, a click or two softer than baseline gives a more comfortable ride on imperfect roads. For circuit tuning, a click or two firmer than baseline reduces body roll and tightens response in fast direction changes. Circuit and street tuning require different damping settings. This is part of the reason EDFC controllers are popular on these kits. The driver can change settings in real time rather than committing to one. Keep a log of which suspension setup works for which conditions ahead of the next track day; the data adds up across a season.
Properly adjusted height and damping settings improve a car's handling, stability, and ride quality. The improvement matters most during spirited driving and on track days.
TEIN Compared to Other Brands We Carry
Coilovers.com carries nine major coilover brands. Each brand fits a specific use case rather than ranking above or below the others. The right brand for any build depends on the chassis, the way the car is driven, and the priorities the build is solving for. Below is a brief situational read on each carried brand.
BC Racing. Value-performance with broad series breadth across BR, DS, ER, ZR, ZRH, and RM lines. The right choice when six-series breadth and accessible pricing across street through circuit use are the priorities.
Bilstein. German OE-supplier with a clear B-numbered hierarchy. The product ladder runs from B6 and B8 performance dampers through B12, B14 PSS, and B16 PSS9 PSS10 coilovers. Bilstein supplies original-equipment dampers to Mercedes-AMG, BMW M, and Porsche. The right choice when OE-supplier engineering credibility is the priority.
Fortune Auto. US hand-assembly in Richmond, Virginia, with custom valving paired to spring rates. The Fortune Auto lineup uses a modular upgrade architecture across the 500 Series, Generation 8, and MSC tiers. The right choice when US-based hand-built construction with custom-spec service is the priority.
Feal Suspension. Boutique American specialty with custom-valving service. The right choice when boutique build philosophy and direct manufacturer-customer engagement are the priorities.
KW Suspension. German engineering with TÜV certification and OEM-grade ride compliance. The product range is organized in a Variant 1 through Variant 3 hierarchy plus Clubsport for circuit applications. The right choice when German engineering with regulatory rigor and ride refinement is the priority.
Ohlins. Swedish racing-derived TTX twin-tube technology in a premium tier. The right choice when racing-derived damping technology and the Ohlins build philosophy are the priorities.
Ksport USA. Broad platform coverage at accessible price points across street and circuit applications. The right choice when platform availability and value-tier pricing are the priorities.
Solo-Werks. Focused German-platform value with specific coverage for European chassis. The right choice when European-platform fit and value pricing intersect on the build.
Whiteline. Adjacent and complementary chassis-component specialist. The Whiteline lineup includes sway bars, bushings, alignment kits, and the MAXG coilover line. The right choice when chassis-component upgrades alongside or instead of full coilover replacement are the priorities.
TEIN's place in the portfolio. The brand sits in the middle of the carried lineup as the Japanese-engineered specialty. It is the right choice when the build is a Japanese chassis platform. Honda, Acura, Toyota, Lexus, Nissan, Infiniti, Mazda, Subaru, Mitsubishi, and Scion vehicle applications are the core market. The priority is Japanese-engineered suspension matched to that chassis with the option of EDFC electronic damping. The ladder from Street Basis Z through Mono Sport, plus EDFC compatibility on most adjustable lines, gives the buyer a clean upgrade path that stays within the Japanese-engineering character of the brand. Call 1-800-460-9106 for help choosing across the portfolio.
Frequently Asked Questions
Is TEIN a Japanese brand?
Yes. TEIN Japan is headquartered in Yokohama, manufactures in Japan, and has been engineering performance suspension since the 1980s. Coilovers.com sources directly as an authorized USA dealer.
How long do TEIN shocks last?
With proper installation, annual inspection, and the maintenance routine outlined above, the kits typically deliver multiple years of service across daily and spirited use. Coilovers.com customer support volume is low. The kits hold up well, and most owners renew rather than rebuild every several years. Driving conditions and use patterns affect lifespan. A track car that sees heavy weekend use will need new components faster than a daily driver. A blown shock at 100,000 miles of street use is rare on a well-maintained kit.
Can you daily drive with coilovers?
Yes. Most TEIN lines are engineered for daily driveability. The Flex Z is the most common daily-driven kit. The damping-matched-to-spring-rate approach plus 16-click adjustability lets drivers soften for commutes and firm up for spirited driving without changing kits. The Street Basis Z and Street Advance Z are also street-oriented. The Mono Sport is more track-focused and trades street comfort for track responsiveness. It can daily drive, but the ride is firmer.
Is TEIN a good company?
The brand has been engineering and manufacturing performance suspension in Japan for over four decades. The product range covers entry-level street kits through track-oriented systems with consistent design philosophy across the ladder. Coilovers.com customers report durability, low support volume, and strong fit on Japanese-chassis vehicle applications. Many owners report very good quality across years of daily use, and the brand's worldwide motorsport involvement feeds the production-line engineering. The good quality of TEIN's manufacturing shows in the low rate of warranty contact our customers report after purchase.
What is the warranty on TEIN kits?
TEIN USA provides a 1-year limited warranty on Street Basis Z, Street Advance Z, Flex Z, RX1, Mono Sport, Flex AVS, and Flex A. The same 1-year limited warranty applies to the EDFC Active Pro and EDFC5 Active Pro controllers. Warranty claims require the original purchase receipt. TEIN also offers an overhaul service for the lines that support it. Details are at tein.com/service.
What is EDFC and is it worth the upgrade?
EDFC stands for Electronic Damping Force Controller. It replaces the manual damping knob on the damper with a controller mounted near the steering wheel. The driver can change damping from inside the car. EDFC is the right add-on for drivers who change damping settings regularly. For a driver who picks one setting at install and never adjusts, EDFC adds cost without much practical benefit. For a driver who runs different settings between commutes and weekends, EDFC turns a manual job into a button press.
What's the difference between Flex Z and Mono Sport?
The Flex Z is a street-and-spirited-driving kit with full-length adjustability, 16-click damping, EDFC compatibility, and a sealed maintenance-free design. The Mono Sport is a circuit-oriented kit with higher spring rates and firmer damping. It is designed for entry-to-mid-level circuit use on specific JDM-platform applications. Drivers who want a primarily street kit with occasional spirited driving choose the Flex Z. Drivers who circuit their car regularly and accept firmer street character choose the Mono Sport.
Are TEIN kits loud or harsh on rough roads?
The damping-matched-to-spring-rate philosophy means most lines stay compliant on rough roads. The Flex A and Flex AVS add hydraulic bump stops that further soften the response to sharp impacts. The Mono Sport runs higher spring rates and is firmer on rough surfaces by design. No kit is harsh in the way a poorly-matched lowering-spring-on-OEM-damper setup can be. The matched damping prevents the bouncy response that comes from oversprung suspensions.
Can I install a TEIN coilover kit myself?
Drivers comfortable with chassis work, torque-spec discipline, and basic suspension geometry can fit the kits in a home garage. The job typically takes four to six hours for a competent DIYer, plus alignment afterward. Drivers who do not have suspension-work experience should use a professional shop. Call 1-800-460-9106 for a referral to one of our trusted installers.
What size lowering can I expect from a TEIN kit?
Most kits offer 1 to 3 inches of height adjustability through the spring perch on the shock body. The exact range depends on the application and the chassis design. Some kits land closer to 1 inch at the high end and 3 inches at the low end. Others run a more limited range. The product page for each application lists the specific drop range.
Will I need an alignment after installing my TEIN coilover kit?
Yes. Any change to ride height or suspension components changes wheel alignment. Schedule a four-wheel alignment after install and after the car has settled at the new height. Settling typically takes a couple hundred miles of normal driving. Improper alignment after a coilover install accelerates tire wear, particularly on the inner edges, and can cause the steering to pull to one side. It also undermines the handling improvements the kit provides and can affect braking stability over long stops.
Does TEIN offer custom spring rates?
The standard product lines come with engineered spring rates calibrated to the application's intended use. Custom spring rate service is not a standard offering across the active range. Drivers with specific spring rate requirements outside the standard lineup should call 1-800-460-9106 to discuss what is available for the chassis.
What if I want EDFC later: can I add it to my Flex Z kit after install?
Yes. EDFC compatibility is engineered into the Flex Z and the other supported lines at the damper level. A Flex Z kit purchased without EDFC can have the controller added later. The controller installs at each damper and routes wiring to the cabin-mounted control unit. Drivers who are uncertain about EDFC at first purchase can install the Flex Z, run it for a season, and add EDFC if the manual damping adjustment becomes a hassle.
Are TEIN parts and rebuild service available in the United States?
TEIN USA supports parts and overhaul service for the lines that allow rebuilds. The Flex Z is sealed and not engineered for internal rebuild. Full replacement is the path at end of useful life. Other lines that support overhaul service can be sent in through the service program at tein.com/service. Coilovers.com customers can call 1-800-460-9106 for help coordinating service on a supported kit.
How do I know which TEIN line is right for my car?
Match the line to the use case. Street Basis Z for entry-level lowering on a daily driver. Street Advance Z when 16-click damping and EDFC compatibility matter without upper mounts. Flex Z when the driver wants the full feature set at a value price. The Flex Z is the volume seller and the right choice for most builds. Flex A or Flex AVS when ride compliance on rough roads is a priority. RX1 when the car is a Honda Civic Type R FK8 or FL5, or another performance Honda or Acura platform that benefits from H.B.S. Mono Sport when the car is a circuit build on a supported JDM-platform chassis. Browse the full TEIN lineup on the collection page or call 1-800-460-9106 if you want a guided walk through the lineup against your specific build.
Ready to Order Your TEIN Coilover Kit?
Coilovers.com carries TEIN for Acura, Honda, Infiniti, Lexus, Mazda, Mitsubishi, Nissan, Scion, Subaru, and Toyota platforms. The active range covers Street Basis Z, Street Advance Z, Flex Z, RX1, Mono Sport, Flex AVS, and Flex A. EDFC Active Pro and EDFC5 Active Pro controllers are available for the supported lines. We are an authorized USA dealer and ship most kits free within the United States.
Call 1-800-460-9106 for fitment guidance, build advice, custom-rate questions, or to place an order with one of our specialists. Or browse the full TEIN selection on our TEIN coilover collection page.