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

IMPREZA GVB
MAX IV GT Spec-A Code No. 80230-AF001V
 
 


▲The above photo is an item for GRB.

Ultimate Street Damper with Latest Theory Based on MAX IV GT



Application   Specification
Engine EJ20(TURBO)
Model Year 10/07 - 14/08
Remarks Height data is based on GRF.
 
  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)
- ○ ( 4.7 )


Ride Height mm
  Factory *2 Test data Adjustable range
High - Low *3
Drivable range
High - Low *4
FRONT Ride height *1 652 678 ~ 635 678 ~ 647
Against stock -26 0 ~ -43 0 ~ -31
REAR Ride height *1 653 676 ~ 639 676 ~ 641
Against stock -23 0 ~ -37 0 ~ -35
*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) 59+19 ( 6+2=8 ) 49+19 ( 5+2=7 )
Free height (mm) 250 200
Spring type Straight Straight
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 / 500 350 / 350
Default position of dial 15 15
Remaining damper stroke (Rebound/Damping)mm 65 / 61 ( 11 ) 74 / 52 ( 2 )
* 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)
265 289 260 257 274 248
Spring
Set length(mm)
247 255
Length to ride hight
adjuster (mm)
33 57 28 9 26 0
Lever ratio 1.10 1.38
* Refer to the above explanation *3 of ride height information for drivable high and low limitations.


Test vehicle information
  F R
Vehicle weight kg 893 627
Tire size (Air pressure) kPa 245 / 40 - 18 ( 230 ) 245 / 40 - 18 ( 190 )
Wheel size 9.0 JJ × 18 off 45 9.0 JJ × 18 off 45
Alignment
(Toe/Camber)
Test data 0 mm / -2°00' +1.8 mm / -2°00'
Standard value 0 ± 3 mm / -0°40' ± 45' 0 ± 3 mm / -1°35' ± 45'
* Test data at HKS.


Parts List * It may be changed without prior notice.


Point
"Ultimate Street Damper" developed under supervision by rally driver Mr. Toshihiro Arai.  Without being too stiff, the supple and tractable stroke creates persistent and stable grip and adequate load shift so the controllability is enhanced to maximize the rewarding feeling of driving. Understeer at high speed corners, which are typical in many 4wd cars, has also been suppressed to the approval of Mr. Arai. The spring rate is rather low; however, the bump rubbers act as 2kgf/mm sub-springs so the handling and road holding performance are much better than expected.
The best handling dial position Rally driver Mr. Toshihiro Arai selected at the time of testing at Gunsai is as follows: GR: F20/R12 and GV: F20/R15
The value within the parenthesis under the stroke section is the stroke length to the bump rubber.
 
 
 
 
 
 
 
 


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