Tein makes six coilover lines. Flex Z is the middle step: the adjustment of the expensive kits at a price close to the entry ones.
Full-length adjustment means the ride height is set by threading the lower mount along the damper body, not by squeezing the spring. The spring keeps its preload and the damper keeps its full stroke at any height, so a lowered car still has suspension travel. Then 16 damping steps, one dial per corner, take it from soft for the commute to firm for a back road.
Flex Z uses a twin-tube damper, the comfort-minded design. Mono Sport and Mono Racing are monotube kits built for grip and response on smooth roads and circuits, and cost more. If the car is a daily driver that sees the odd track day, Flex Z is the better fit. Street Advance Z also has 16 steps for a little less, but Flex Z covers far more cars.
EDFC is Tein's Electronic Damping Force Controller: a small motor on each damper's adjuster and a controller in the cabin, so you change the 16 steps from the driver's seat instead of under the car. Flex Z takes it with no changes. It is a separate Tein kit that we don't list yet: ask us and we'll price it for your car.
No. Flex Z works fully without it: you set the 16 damping steps by hand with the dial on each damper. EDFC only moves that dial for you from the cabin, which matters if you change settings often, say between the commute and a track day. You can add it later and nothing on the coilovers changes.
It is different for every car, because each Flex Z kit is built for one chassis. Tein publishes the range on each kit's spec sheet. Full-length adjustment means you can set the height anywhere in that range without losing damper stroke. Tell us your car and we'll send you the numbers.
Usually the tires decide before the coilovers do: wheel offset, tire size and fender clearance set the practical limit. Every height change also moves camber and toe, so plan an alignment after you settle on a height, and set the height first.
Flex Z is covered by Tein's manufacturer warranty against defects. Terms depend on the kit and how the car is used, so ask us before you buy and we'll confirm them for your kit.
Flex Z bolts to the factory mounting points: no cutting or welding. If you are comfortable removing struts, it is a driveway job with the right tools, and a shop can do it in an afternoon. Either way, finish with a professional alignment.
