Your Cart is Empty

HKS Hipermax IV GT Suspension Subaru Impreza GRF 80230-AF001

̢‰ÛÒå_The above photo is an item for ZN6.

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


Application ̣‰â‰â Specification
Engine EJ25(TURBO)
Model Year 09/02 - 
Damping force adjustment 30 steps 30 steps
Base valve - -
Height adjustable lower bracket ̢‰ÛӉÛ_ ̢‰ÛӉÛ_
Upper mount Rubber Rubber
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)
- -


Ride Height mm
  Factory *2 Test data Adjustable range
High - Low *3
Drivable range
High - Low *4
FRONT Ride height *1 654 ‰ � 685 Ìøå_�_ 606 685 Ìøå_�_ 646
Against stock -31 ‰ � 0 Ìøå_�_ -79 0 Ìøå_�_ -39
REAR Ride height *1 650 ‰ � 684 Ìøå_�_̣‰â‰âÂ596 684 Ìøå_�_̣‰â‰âÂ615
Against stock -34 ‰ � 0 Ìøå_�_ -88 0 Ìøå_�_ -69


*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) 78 ( 8 ) 59 ( 6 )
Free height (mm) 220 200
Spring type Straight Barrel type Straight
Recommended range to change spring rate N/mm(kgf/mm) å±20 ( 2 ) å±20 ( 2 )
Specification of damper
  F R
Damping force (Rebound/Damping)N* 1422 / 373 461 / 177
Default position of dial 15 15
Remaining damper stroke (Rebound/Damping)mm 47 / 69 40 / 60
* 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)
269 ‰ � 297 265 253 ‰ � 268 233
Set length(mm)
217 ‰ � ‰ � 220 195 ‰ � 185 200
Length to ride hight
adjuster (mm)
63 ‰ � 91 56 39 ‰ � 64 14
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 9.0 JJ ÌÑ 18 off 45 9.0 JJ ÌÑ 18 off 45
Test data 0 mm / -2å¡36' 0 mm / -1å¡42'
Standard value 0 å± 3 mm / -0å¡40' å± 45' 0 å± 3 mm / -1å¡35' å± 45'
* Test data at HKS.


Parts List * It may be changed without prior notice.


̣®ÕåÈIt didn't give up the driving performance and at the same time it provides comfort in town driving. MAX IV has advanced even more from the MAX III.
̣®ÕåÈWe have adopted newly developed needle and variable port system for both front and rear that makes damping force at the low speed range, which is very important for comfortable and great steering with no upthurst and floating feel.
̣®ÕåÈWith the new design of piston and M shaft for rear damper provides better oil pressure that gives comfortable dive.
̣®ÕåÈThe damping level can be adjusted with dial for slow drive or winding road drive or all other type of situation.
̣®ÕåÈThe normal rear damper has not so good driving experience but the MAX IV provides awesome feeling and performance in driving, especially for a town drive.
̣®ÕåÈEven setting the damping level to soft doesn't make it floating feeling so when having a long distance driving, you won't get tired and have a great comfort for the passenger.
̣®ÕåÈWhen you set the damping level to hard, you can feel directly of the step differrence and direct handling.
̣®ÕåÈSet damping level 20 to 25 for soft and 10 to 15 for hard setting.
  • It is our ambition at motorvention.com for all of our customers to be 100% satisfied with their purchase(s). If for any reason you are not satisfied we guarantee to refund any item you are not completely happy with.


    If you are unsatisfied in any way, we are happy to refund items that are returned to us within 30 natural days of receiving your order.

    Item(s) must be returned at the customers expense in new, unused condition with original tags still attached in order to receive a refund. Limited edition items and items purchased on sale cannot be returned for a refund.

    We are unable to accept items for return if;

    Package has been opened and item has been used.

    Item is marked, scratched, bleached or damaged in anyway.

    Item is scented with aftershave, perfume, deodorant or smoke.

    Item have been washed.

    Once your return is received and inspected, we will send you an e-mail to notify you that we have received your returned item. We will also notify you of the approval or rejection of your refund.


    We do not exchange item(s). If you purchased an item from motorvention.com and would like a different colour, size or style, a new order will need to be placed with the unwanted item(s) returned for a refund. See below for instructions on how items can be returned.


    Cancellation of an order must be made during the first 60 minutes after purchase. Requests of cancellation of an order after 60 minutes from purchasing will not be accepted.

    Customer cancellation(s) will be reflected as a refund during the next 5 business days. Receiving a refund within this time period can also depend on the customers bank or payment providers processing time.

    To request a cancellation contact our customer services team at support@motorvention.com.


    To exercise the right to return an item(s), you must contact our customer service team via e-mail at support@motorvention.com.

    To complete your return, we require a receipt or proof of purchase.

    After a refund has been accepted, confirmation will be sent to you by e-mail.

    The refund can take between 7 to 14 business days to be reflected on your account statement.

    If you haven’t received a refund yet, please first check your bank account again.

    Then contact your credit card company, it may take some time before your refund is officially posted. Next contact your bank. There is often some processing time before a refund is posted.

    If you’ve done all of this and you still have not received your refund yet, please contact support@motorvention.com.