Your Cart is Empty

HKS Hipermax IV GT Suspension Nissan Skyline R34 GT-T RB25DET ER34 80230-AN005

The new Max IV sporty suspension. Awesome sporty drive with great control and comfortable ride in the street.

Application ‹ÛÛ Specification
Engine RB25DET
Model Year 98/05 - 01/06
Remarks GT-T(HICAS included)
Damping force adjustment 30 steps 30 steps
Base valve - -
Height adjustable lower bracket 䄆 䄆
Upper mount Rubber Rubber
Inverted/Normal type Normal Normal
Damper/Spring layout Coilover Coilover
Spring rate change at factory Possible Possible
Damping force adjustment with wire - 䄆
Helper spring
(Spring rate N/mm)
- 䄆 ( 19.8 )

Ride Height mm
  Factory *2 Test data Adjustable range
High - Low *3
Drivable range
High - Low *4
FRONT Ride height *1 649 ‰ � 690 •__ 623 688 •__ 632
Against stock -41 ‰ � 0 •__ -67 -2 •__ -58
REAR Ride height *1 657 ‰ � 688 •__‹ÛÛ570 688 •__‹ÛÛ607
Against stock -31 ‰ � 0 •__ -118 0 •__ -81
*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) 69 ( 7 ) 49 ( 5 )
Free height (mm) 250 250
Spring type Straight 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* 843 / 167 588 / 177
Default position of dial 15 15
Remaining damper stroke (Rebound/Damping)mm 47 / 53 67 / 103
* 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)
320 ‰ � 335 313 492 ‰ � 522 466
Set length(mm)
242 ‰ � 222 250 301 ‰ � 301 324
Length to ride hight
adjuster (mm)
65 ‰ � 100 50 158 ‰ � 188 109
Lever ratio 1.10 1.03
* Refer to the above explanation *3 of ride height information for drivable high and low limitations.

Test vehicle information
  F R
Vehicle weight kg - -
Tire size (Air pressure) kPa 235 / 40 - 18 ( 230 ) 235 / 40 - 18 ( 230 )
Wheel size 8 JJ ÌÑ 18 inset 30 8 JJ ÌÑ 18 inset 30
Test data out 1 mm / -1å¡42' in 3 mm / -1å¡45'
Standard value in 5 •__ out 5 mm / -0å¡45' å± 0å¡45' 0 •__ out 5.2 mm / -0å¡55' å± 0å¡45'
* Test data at HKS.

Parts List * It may be changed without prior notice.

‹ÄÈSet for city drive.
‹ÄÈThe vehicle height data from other than the test is computational data.(The numbers does not guaranteeing the height)
‰яProcess for installation
Required to make an hole for rear damping adjustment cable(rear interior)
  • 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.