HKS Hipermax IV SP Suspension Subaru Impreza STI GHB

Code No. 80250-AF001




â–²The above photo is an item for GRB.

The sport model to have a comfortable drive even in the winding road.





Application

Specification

Engine

EJ25(TURBO)

Model Year

10/07 - 14/08

Remarks

FRONT

REAR

Damping force adjustment

30 steps

30 steps

Base valve

-

-

Height adjustable lower bracket

â—‹

â—‹

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
(Spring rate N/mm)

â—‹ ( 19.8 )

â—‹ ( 19.8 )





Ride Height

mm

Factory *2

Test data

Adjustable range
High - Low *3

Drivable range
High - Low *4

FRONT

Ride height *1

659

←

685 ～ 614

685 ～ 623

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.





Kit information

Spring of Full Kit

F

R

Spring rate N/mm(kgf/mm)

118 ( 12 )

98 ( 10 )

Free height (mm)

170

170

Spring type

Straight

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*

2373 / 432

1187 / 157

Default position of dial

15

15

Remaining damper stroke (Rebound/Damping)mm

55 / 58

49 / 66

* 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)

281

←

305

268

251

←

275

251

Spring
Set length(mm)

220

←

220

240

223

←

221

244

Length to ride hight
adjuster (mm)

63

←

87

30

22

←

48

1

Lever ratio

1.10

1.38

* Refer to the above explanation *3 of ride height information for drivable high and low limitations.





Test vehicle information

F

R

Vehicle weight kg

893

627

Tire size (Air pressure) kPa

245 / 40 - 18 ( 230 )

245 / 40 - 18 ( 190 )

Wheel size

8.5 JJ × 18 off 55

8.5 JJ × 18 off 55

Alignment
(Toe/Camber)

Test data

0 mm / 2 °36'

0 mm / 1 °54'

Standard value

0 ± 3 mm / -0 °40' ± 45'

0 ± 3 mm / -1 °35' ± 45'

* Test data at HKS.





Parts List * It may be changed without prior notice.




Point

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 reboun...