HKS Hipermax IV GT Spec A Suspension Kit Subaru Impreza GDB

Code No. 80230-AF002V

▲The above photo is an item for GDB・GDA・GGA.

Ultimate Street Damper with Latest Theory Based on MAX IV GT

Application

Specification

Engine

EJ20(TURBO)

Model Year

00/10 - 04/05

Remarks

FRONT

REAR

Damping force adjustment

30 steps

30 steps

Base valve

-

-

Height adjustable lower bracket

○

○

Upper mount

Spherical bearing

ゴム固定

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)

○(4.7)

○(19.8)

Ride Height

mm

Factory *2

Test data

Adjustable range
High - Low *3

Drivable range
High - Low *4

FRONT

Ride height *1

642

←

693 ～ 635

693 ～ 637

Against stock

-46

←

0 ～ -58

0 ～ -56

REAR

Ride height *1

638

←

667 ～ 628

667 ～ 634

Against stock

-28

←

0 ～ -38

0 ～ -33

*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)

59+19 ( 6+2=8 )

38+19 ( 4+2=6 )

Free height (mm)

250

250

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*

820 / 400

400 / 220

Default position of dial

15

15

Remaining damper stroke (Rebound/Damping)mm

70/56(6)

78/91(11)

* 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)

294

←

336

285

343

←

369

340

Spring
Set length(mm)

282

←

←

←

297

←

←

295

Length to ride hight
adjuster (mm)

22

←

64

13

122

←

148

117

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

897

612

Tire size (Air pressure) kPa

235 / 40 - 18 ( 220 )

235 / 40 - 18 ( 220 )

Wheel size

8.5 JJ × 18 off 50

8.5 JJ × 18 off 50

Alignment
(Toe/Camber)

Test data

0 mm / -1°12'

+2 mm / -1°48'

Standard value

0 ± 3 mm / -0°30' ± 45'

0 ± 3 mm / -1°40' ± 45'

* Test data at HKS.

Parts List * It may be changed without prior notice.

Point

"Ultimate Street Damper" developed for VAB model under supervision by rally driver Mr. Toshihiro Arai. Maintaining handlability and stability to enjoy driving on various road conditions were focused to develop this damper. Then, the genuine damper delivering the best ride comfort not only for the driver but also passengers was developed. The damping force tends to be stiff to secure the ride quality; however, it may cause the reduction of the tire’s surface pressure resulting in lowering the limit grip force. Also, the ride quality may deteriorate due to the vertical G force. Reviewing the geometry and stroke, establishing required spring rate and damping force, completely eliminating unnecessary elements achieved the handlability and stability in a hi...