Explanation of the product Application chart

MAX IV GT 20SPEC Code No. 80230-AT023A

▲The above photo is an item for DB42.

An updated MAX IV GT with improved handling and comfort, an ulimate street suspension.

Application   Specification
Engine B48
Model Year 19/05 - 
Remarks Note: When height is adjusted various parts will be misaligned. Including Radar, Camera, wheel alignment, and can cause the Toyota Supra Safety system to malfunction.
Damping force adjustment 30 steps 30 steps
Base valve - -
Height adjustable lower bracket
Upper mount Spherical bearing Rubber
Inverted/Normal type Inverted Normal
Damper/Spring layout Coilover Separated
Spring rate change at factory
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 *1 661 683 ~ 638 683 ~ 638
Against stock -22 0 ~ -45 0 ~ -45
REAR Ride height *1 672 694 ~ 639 694 ~ 639
Against stock -22 0 ~ -55 0 ~ -55
*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 ) 118 ( 12 )
Free height (mm) 200 250
Spring type Straight Straight
Recommended range to change spring rate N/mm(kgf/mm) ±10(1) ±20 ( 2 )
Specification of damper
  F R
Damping force (Rebound/Damping)N* 1133 / 515 633 / 417
Default position of dial 15 15
Remaining damper stroke (Rebound/Damping)mm 40 / 49 55 / 59
* 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)
279 289 264 319 339 291
Set length(mm)
195 186 200 - - - -
Length to ride hight
adjuster (mm)
20 39 0 42 56 22
Lever ratio 1.18 1.69(spg) , 1.20(dmp)
* Refer to the above explanation *3 of ride height information for drivable high and low limitations.

Test vehicle information
  F R
Vehicle weight kg 729.5 724
Tire size (Air pressure) kPa 255 / 35 - 19 ( 220 ) 275 / 35 - 19 ( 220 )
Wheel size 9.5J × 19 10.5J × 19
Test data in 0.4 mm / -2°23' in 1.2 mm / -2°34'
Standard value in 3.1 mm ± 2.3 mm / -1°45' ± 0°30' in 2.7 mm ± 2.3 mm / -2°00' ± 0°25'
* Test data at HKS.

Parts List * It may be changed without prior notice.

With the latest setting technology, the ability to be able to drive comfortably and with stability, while still not losing any of the performance on rough street roads is capable.
While the Stock Electrical Shock Absorber performs great. Having conventional shocks gives the driver more control. Our intent is to give the driver various controls and settings to be able to adjust the car to their personal style.
The main development vehicle is a B48 engine that has been boosted-up with 19-inch-high grip radials. These settings were made with the users’ intent in mind.
Dampening is easily adjustable by using a dial. Adjusting this will help the vehicle’s handling on acceleration or deceleration. This allows the rear tires to be able to gain more traction.
The front adopts the traditional HIPERMAX inverted structure, and the cylinder outer is penetrated to the upright mounting part, so that the stroke can be secured even when the vehicle height is lowered.
In addition, a slide type pillow upper has been adopted to the strut making it easier to add camber angle.
The rear upper plate has been machined out of strong, yet lightweight aluminum to consider weight reduction and performance. A rubber mount has been added to the rear upper for ride comfortability.
A straight wound spring type has been adopted for both the front and the rear; Spring rates are easily changeable.
Note: An error cancellation unit is required for the removal of The Stock Electrical Shock Absorber.