HKS Hipermax IV GT Suspension Subaru Impreza GDB STI 5x114.3

Code No. 80230-AF003




▲The above photo is an item for GDB.

Awesome control and comfort ride on the street for a sporty drive. The new Max IV sporty suspension.





Application

Specification

Engine

EJ20(TURBO)

Model Year

04/06 - 07/06

Remarks

FRONT

REAR

Damping force adjustment

30 steps

30 steps

Base valve

-

-

Height adjustable lower bracket

○

○

Upper mount

Rubber

Rubber

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 )





Ride Height

mm

Factory *2

Test data

Adjustable range
High - Low *3

Drivable range
High - Low *4

FRONT

Ride height *1

660

←

693 ～ 637

693 ～ 643

Against stock

-33

←

0 ～ -56

0 ～ -50

REAR

Ride height *1

655

←

655 ～ 568

655 ～ 579

Against stock

-12

←

-12 ～ -99

-12 ～ -88

*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 ( 6 )

29 ( 3 )

Free height (mm)

220

250

Spring type

Straight Barrel type

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*

1515 / 412

441 / 157

Default position of dial

15

15

Remaining damper stroke (Rebound/Damping)mm

49 / 50

85 / 84

* 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)

284

←

302

284

391

←

391

365

Spring
Set length(mm)

205

←

193

220

280

←

280

324

Length to ride hight
adjuster (mm)

88

←

118

73

151

←

151

81

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°48'

0 mm / -2°00'

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

・We made the suspension more comfortable to ride with by making the weight more movable.
・Usually the rear will have a bad movement if the vehicle height lowered, but with the new 3 kg, it has a wonderful feeling.
・We have set it not to push up even at a big ramp.
・The damper will move aggressively even in the rough streets to make tires to contact the ground, therefore it will run fine on any kinds of roads.
・We set it mild to have a comfortable long distance drive and also have a comfortable ride for the passenger.
・Recommended dial setting for both front and rear is 15.(factory setting)
・It’s not only soft, but also it can have a sporty driving that have the weight s...