HKS Hipermax IV GT WRX STI Full Kit
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"Natural steering feeling" so that a driver can trace the line as desired was pursued as STI's unique handling characteristic.
Focusing on driving stability during cornering to match the vehicle's characteristics, the helper springs in the front and rear maintain the stroke amount on the extension side so the tires can continuously contact even on rough road surfaces.
Management of VPS improves the driving comfort and sportiness. Driving comfort can be maintained under long-distance driving much better than the stock suspension.
Utilizing the helper springs in both front and rear dampers enables to secure the stroke of the extension side as possible.
The default setting is the dial 15 so the suspension can actively work. For highly stability, set the dial to 20 to 25.
The alignment data shows the value when the camber adjusting bolt under the front strut is turned to the full negative side.
Compatibility with WRX was confirmed by actual fitting.
Application:
| Engine | FA20(TURBO) |
| Model Year | 14/** - |
| Remarks | USDM FA20 6MT |
Specification:
| FRONT | REAR | |
| Damping force adjustment | 30 steps | 30 steps |
| Base valve | - | - |
| Height adjustable lower bracket | ? | ? |
| Upper mount | Rubber | Rubber |
| Inverted/Normal type | Inverted | Normal |
| Damper/Spring layout | Coilover | Coilover |
| Spring rate change at factory | Possible | Possible |
| Damping force adjustment with wire | - | - |
| Helper spring (Spring rate N/mm) |
? ( 4.7 ) | ? ( 4.7 ) |
Ride Height:
| Factory *2 | Test data | Adjustable range High - Low *3 |
Drivable range High - Low *4 |
||
| FRONT | Ride height *1 | 648 | ? | 675 ? 620 | 675 ? 627 |
| Against stock | -27 | ? | 0 ? -55 | 0 ? -48 | |
| REAR | Ride height *1 | 659 | ? | 679 ??605 | 679 ??605 |
| Against stock | -20 | ? | 0 ? -74 | 0 ? -74 | |
*1. Height from road surface to fender arch.
*2. Height at factory is the data tested at HKS with the setting of Full Kit. (HKS' recommended setting.)
*3. Adjustable range (However, the lowest value may not be road legal.
Even within the adjustable range, car body, arm etc. may contact. In such case, it will be hard to drive.
Damper oil leakage or any other problems caused by low ride height setting from the factory setting will void the warranty of the product.)
*4. Drivable range that there is no contact of car body or arms etc. (However, change of tire/wheel size may cause a problem.)
Caution).
Kit information:
Spring of Full Kit
| F | R | |
| Spring rate N/mm(kgf/mm) | 78 ( 8 ) | 59 ( 6 ) |
| Free height (mm) | 220 | 170 |
| Spring type | Straight Barrel type | Straight |
| Recommended range to change spring rate N/mm(kgf/mm) | ±20 ( 2 ) | ±20 ( 2 ) |
Specification of damper:
| F | R | |
| Damping force (Rebound/Damping)N* | 971 / 412 | 392 / 147 |
| Default position of dial | 15 | 15 |
| Remaining damper stroke (Rebound/Damping)mm | 62 / 51 | 61 / 55 |
* The value of the damping force is at piston speed of 0.1m/sec.
Setting data:
| F | R | |||||||
| Default | Test | Drivable limit High * |
Drivable limit Low * |
Default | Test | Drivable limit High * |
Drivable limit Low * |
|
| Length of case (mm) |
269 | ? | 285 | 269 | 253 | ? | 269 | 235 |
| Spring Set length(mm) |
249 | ? | 238 | 270 | 206 | ? | 206 | 231 |
| Length to ride hight adjuster (mm) |
28 | ? | 55 | 7 | 44 | ? | 60 | 1 |
| Lever ratio | 1.00 | 1.26 | ||||||
* Refer to the above explanation *3 of ride height information for drivable high and low limitations.