MAX IV GT Spec-A WRX STI
Explanation of the product Application chart

WRX STI VAF
MAX IV GT Spec-A Code No. 80230-AF009V
 
 


▲The above photo is an item for VAB.

Ultimate Street Damper with Latest Theory Based on MAX IV GT



Application   Specification
Engine EJ25(TURBO)
Model Year 14/** - 
Remarks USDM EJ25 6MT (calculated on the basis of Max4GT's data)
 
  FRONT REAR
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 Coilover
Spring rate change at factory Possible Possible
Damping force adjustment with wire - -
Helper spring
(Spring rate N/mm)
- ○ ( 4.9 )


Ride Height mm
  Factory *2 Test data Adjustable range
High - Low *3
Drivable range
High - Low *4
FRONT Ride height *1 - 656 675 ~ 645 675 ~ 652
Against stock - -19 0 ~ -30 0 ~ -23
REAR Ride height *1 - 660 680 ~ 649 680 ~ 654
Against stock - -20 0 ~ -31 0 ~ -26
*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) 49+19~ ( 5+2~=7~) 39+19~ ( 4+2~=6~)
Free height (mm) 250 220
Spring type Straight Straight Barrel type
Recommended range to change spring rate N/mm(kgf/mm) ±20 ( 2 ) ±20 ( 2 )
Specification of damper
  F R
Damping force (Rebound/Damping)N* 1000 / 490 370 / 350
Default position of dial 15 15
Remaining damper stroke (Rebound/Damping)mm 69 / 57 ( 7 ) 72 / 54 ( 4 )
* 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)
263 260 279 256 253 250 266 245
Spring
Set length(mm)
238 232 249 239
Length to ride hight
adjuster (mm)
40 43 62 39 31 38 54 33
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 - -
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°30' 0 mm / -2°18'
Standard value IN * ± * mm / -*°**' ± **' IN * ± * mm / -*°**' ± **'
* Test data at HKS.


Parts List * It may be changed without prior notice.


Point
・The product concept for MAX IV GT series is "Ultimate Street Damper". This Spec-A is a further ultimate damper. The low spring rate and sufficient stroke provide better ride quality for street use, and its adequate damping force allows easy handling. Without reference to the concept of the standard sports suspension, HKS made Spec-A as the optimal street & sports suspension.
・Sufficient stroke can maintain stability and smoothness even on gaps and bumps on the road. This product has longer stroke on both front and rear compared to a conventional MAX IV GT to achieve high ride quality.
・The variable rated bump rubbers act as sub-springs enabling the main spring rate to be reduced which provides the stable and superior driving performance on rough road surfaces. Also, the bump rubber supports the body roll at cornering to obtain stable driving feeling
・Piston design allows the valves to bend from very low speed range can provide a more gradual damping feeling. The product setup leads to reduced grip loss or fluctuation caused by changes in road surface state helping safe driving with reduced fatigue.
・Some of components of the front damper are close to tires, so make sure the rim and side wall do not come in contact with the damper parts when replacing the tires to bigger ones.
・A short stabilizer link for the front side is included. When the front case length is extended more than 263mm, use a stock stabilizer link.
・The alignment data show the result when the camber adjusting bolt at the lower part of the front strut is positioned maximally to the negative side, and the upper mount is positioned to the default.
・The tires used for testing were 265/35-18 high grip radial tires.
 
 
 


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