HKS HIPERMAX IV SP Coilover Kit Subaru STI 2008-2014
- This product utilizes an adjustment dial that allows various driving conditions from street to circuit with high grip radial tires.
- For further performance improvement, this product was developed with latest parts such as new shape needle, M-shaft, aluminum bracket, etc. based on Hipermax III Sports 09 Spec,
- Its adequate stiffness of the damping force enables the smooth cornering. Also, the setting was performed to take a load toward the rear at the exit of the corner.
- No upthrust over the level difference of a road and stable vehicle movement without floating feeling can be provided, which maintains the comfortable driving on a street.
- The helper springs are installed on both front and rear. The rebound stroke for the spring rate is sufficient so it provides superior road surface follow-up property and stability in the criteria zone, and has a positive effect on traction. Its smooth rear sliding is distinctive.
- Adjust the dial to 10-15 for circuit driving, to 15-20 for street driving, and to 20-30 if better ride quality is prioritized for other passengers.
- Since the front damper is close to the front tire and wheel, make sure the damper does not come into contact with any other parts of a vehicle when lowering the vehicle height. If the damper comes into contact with any other parts of a vehicle, slide the tire wheel outward using a wheel spacer or a similar tool.
- The rear case length is set to the lower limit before shipment; it cannot be shorter. To lower the vehicle height, adjust the preload.
| FRONT | REAR | |
| Damping force adjustment | 30 steps | 30 steps |
| Base valve | – | – |
| Height adjustable lower bracket | ||
| Upper mount | Spherical bearing | Spherical bearing |
| Inverted/Normal type | Inverted | Normal |
| Damper/Spring layout | Coilover | Coilover |
| Spring rate change at factory | Possible | Possible |
| Damping force adjustment with wire | – | – |
| Helper Spring | ( 19.8 ) | ( 19.8 ) |
| (Spring rate N/mm) |
Ride Height
| mm | |||||
| Factory *2 | Test data | Adjustable range | Drivable range | ||
| High – Low *3 | High – Low *4 | ||||
| FRONT | Ride height *1 | 659 | 685614 | 685623 | |
| Against stock | -26 | 0-71 | 0-62 | ||
| REAR | Ride height *1 | 648 | 684 619 | 684 619 | |
| Against stock | -36 | 0-65 | 0-65 |
*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). Actual data depends on each vehicle.
