MAX IV GT 20SPEC
WRX STI
WRX STI VAB

MAX IV GT 20SPEC

Code No. 80230-AF009A

*Discontinued.

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

 

 

▲The above photo is an item for VAB.

 

 

 

 

Application

Engine EJ20(TURBO)
Model Year 14/08 - 20/04
Remarks 6MT

Specification

  FRONT REAR
Damping force adjustment 30 steps 30 steps
Base valve - -
Height adjustable lower bracket
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)
○ ( 4.7 ) ○ ( 4.7 )
Ride Height mm
  Factory *2 Test data Adjustable range
High - Low *3
Drivable range
High - Low *4
FRONT Ride height *1 655 674 ~ 633 674 ~ 633
Against stock -19 0 ~ -41 0 ~ -41
REAR Ride height *1 659 673 ~ 614 673 ~ 614
Against stock -14 0 ~ -59 0 ~ -59

*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) 88 ( 9 ) 69 ( 7 )
Free height (mm) 220 170
Spring type Straight Barrel type Straight
Recommended range to change spring rate N/mm(kgf/mm) ±10 ( 1 ) ±10 ( 1 )

Specification of damper

  F R
Damping force (Rebound/Damping)N* 700 / 490 360 / 340
Default position of dial 15 15
Remaining damper stroke (Rebound/Damping)mm 55 / 58 62 / 54

* 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)
269 288 262 259 270 236
Spring
Set length(mm)
254 254 269 220 220 233
Length to ride hight
adjuster (mm)
22 41 0 36 47 0
Lever ratio 1.00 1.26

* Refer to the above explanation *3 of ride height information for drivable high and low limitations.



Test vehicle information

  F R
Vehicle weight kg 900 590
Tire size (Air pressure) kPa 245 / 40 - 18 ( 230 ) 245 / 40 - 18 ( 220 )
Wheel size 8.5 JJ × 18 inset 55 8.5 JJ × 18 inset 55
Alignment
(Toe/Camber)
Test data 0 mm / -2°24' 0 mm / -2°18'
Standard value 0 ± 3 mm / -0°45' ± 30' in 3 ± 3 mm / -1°40' ± 45'

* Test data at HKS.


Parts List  * It may be changed without prior notice.

 


Point

The new version improves the steering for enjoying the drive even more together with comfortability.
With technology improvement, HKS continues to successfully improve control and damping force characteristics. The new MAX IV GT 20 Spec improves the comfortability of both driving and steering compared to the existing MAXIV GT by increasing the spring rate by 1kg at both front and rear. Enjoy the improved steer feeling on the winding road or circuit. Regular MAXIV GT retains damping force mild to keep the comfortable driving and weight transfer at the rear side with tuck-in in the corners. Damping convergence is also improved.
For users who prefer the drive comfort, we recommend reducing the spring rate by 1 kg at both front and rear. Users who don't care about the small vibrations can select a higher spring rate setting. It makes steer feeling of the car more sporty and alive.
The alignment data came from at the camber adjusting bolt of the front strut fully turned to the negative side.
The shock body length at the front should be kept more than 262 mm of the lowest limit of the driving. If the length less than 262 mm, the wheel touches the fender over bumps.
Please use the stock stabilizer link when setting up the front shock body length more than 279 mm.
 
 
 
 
 



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