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HKS Hipermax MAX IV GT Nissan GT-R

HKS Hipermax MAX IV GT Nissan GT-R



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

It’s perfect for daily street drive with style and performance. You and your passenger can have a comfortable ride even with a low-down.

Single Tube Damper Design

Mono tube dampers allow for more accurate and stable control and adjustment of dampening. Lower ride height and centre of gravity gives a more stable ride.

Dust Boot

Protect the shaft from the flying stones.

PNE Coating

Using this special surface coating provides 5 times better durability over standard galvanising. This prevents build-up around the threads of the adjustment areas allowing for easier height adjustment.

“M Shaft”

With the new design of cylinder shaft since the HIPERMAX M-1, MAX IV increased the cylinder shaft size to have a firm damping even at a little stroke range because of the optimized oil pressure characteristic. We mainly adopted this to the rear damper that can have a better driving experience.

New DesignNeedle

Newly designed needle has been used to revise the very low speed and middle and high speed dampening which is key to a comfort ride.

Reduction of Unsprung Weight

In order to reduce unsprung weight, bracket, ride height adjusters and lock nuts are made from aluminium. (Not for all vehicles)

30 Step Damping Force Adjustment

30 levels of dampening adjustment allow fine tune adjustment for street or circuit.

In stock


Application Specification
Engine VR38DETT
Model Year 07/12 –
Damping force adjustment 30 steps 30 steps
Base valve
Height adjustable lower bracket
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
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 *1 711 723 ~ 645 723 ~ 645
Against stock -12 0 ~ -78 0 ~ -78
REAR Ride height *1 719 732 ~ 662 732 ~ 675
Against stock -13 0 ~ -70 0 ~ -57
*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
Spring rate N/mm(kgf/mm) 157 ( 16 ) 78 ( 8 )
Free height (mm) 200 250
Spring type Straight Straight
Recommended range to change spring rate N/mm(kgf/mm) ±20 ( 2 ) ±20 ( 2 )
Specification of damper
Damping force (Rebound/Damping)N* 1300 / 250 700 / 160
Default position of dial 15 15
Remaining damper stroke (Rebound/Damping)mm 35 / 65 73 / 97
* The value of the damping force is at piston speed of 0.1m/sec.
Setting data
Default Test Drivable limit
High *
Drivable limit
Low *
Default Test Drivable limit
High *
Drivable limit
Low *
Length of
case (mm)
474 481 470 417 429 385
Set length(mm)
225 225 260 318 318 325
Length to ride hight
adjuster (mm)
65 72 26 51 63 12
Lever ratio 1.69 1.12
* Refer to the above explanation *3 of ride height information for drivable high and low limitations.


Test vehicle information
Vehicle weight kg
Tire size (Air pressure) kPa 255 / 40 – 20 ( 200 ) 285 / 35 – 20 ( 200 )
Wheel size 9.5 JJ × 20 off 45 10.5 JJ × 20 off 25
Test data in 0°10′ / -1°30′ in 0°30′ / -1°30′
Standard value
* Test data at HKS.


Parts List * It may be changed without prior notice.
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・HKS has set the MAX IV for both sportiness and comfort.
・We haven’t spoiled stock’s sportiness and improved the comfortable drive and also provides better control.
・We have improved the driving experience drastically compared to the old model by analyzing year 2012 model and VPS and new piston.
・We have improved driving performance of road-hugging property by high-rate + helper-spring. And improving the start-up damping allow comfortable drive and keep down the sudden pressure change.
・Set about 20th step for a comfort drive and about 5th step for a fast drive.
・If the length of case shortens below the lower limit value, it is likely to interfere with the upper arm and body. Also depend on the size of the tire wheel, it could interfere with fender even within the limits.


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