HKS Hipermax IV SP Suspension Subaru Impreza GDB

Application

Specification

Engine

EJ20(TURBO)

Model Year

00/08 - 07/06

Remarks

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

Inverted

Damper/Spring layout

Coilover

Coilover

Spring rate change at factory

Possible

Possible

Damping force adjustment with wire

-

-

Helper spring
(Spring rate N/mm)

○ ( 19.8 )

○ ( 19.8 )

Ride Height

mm

Factory *2

Test data

Adjustable range
High - Low *3

Drivable range
High - Low *4

FRONT

Ride height *1

646

←

693 ～ 627

693 ～ 627

Against stock

-47

←

0 ～ -66

0 ～ -66

REAR

Ride height *1

638

←

667 ～ 629

667 ～ 629

Against stock

-29

←

0 ～ -38

0 ～ -38

*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

220

Spring type

Straight

Straight Barrel type

Recommended range to change spring rate N/mm(kgf/mm)

±20 ( 2 )

＋20 ( 2 )

Specification of damper

F

R

Damping force (Rebound/Damping)N*

1900 / 700

700 / 300

Default position of dial

15

15

Remaining damper stroke (Rebound/Damping)mm

40 / 47

68 / 91

* 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)

289

←

332

289

359

←

386

351

Spring
Set length(mm)

208

←

208

225

294

←

294

294

Length to ride hight
adjuster (mm)

67

←

110

50

103

←

130

95

Lever ratio

1.10

1.08

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

Test vehicle information

F

R

Vehicle weight kg

895

586

Tire size (Air pressure) kPa

225 / 40 - 18 ( 220 )

225 / 40 - 18 ( 220 )

Wheel size

7.5 JJ × 18 off 50

7.5 JJ × 18 off 50

Alignment
(Toe/Camber)

Test data

0 mm / -1°36'

in 3 mm / -1°00'

Standard value

0 ± 3 mm / -0°20' ± 45'

0 ± 3 mm / -1°25' ± 45'

* Test data at HKS.

Parts List * It may be changed without prior notice.