HKS MAX IV SP Coilover Kit – 1991-1995 Mazda RX-7

$2,554.14

SKU: 80250-AZ001T Category: Tags: , , , Brand:

The sport model to have a comfortable drive even in the winding road.

This “MAX IV SP” is the ultimate sport model for such a high grip radial tire. It will transfer the feelings straight to driver all kinds of information such as tire, road surface condition and traction. It’s a perfect street sport model suspension for people who love to drive fast but still want comfort.

Single Tube Damper Design

Mono tube dampers allow for more accurate and stable control and adjustment of dampening. Lower ride height and center 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 (Φ46 normal type)

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 by optimizing the oil pressure characteristic. We mainly adopted this to the rear damper that can have a better driving experience.

Adopted Pillow Ball Upper Mount

For more accurate and sharp steering.

New Design Needle

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 Adjustmentmax4sp_1.jpg

30 levels of dampening adjustment allow fine tune adjustment for street, circuit winding roads, highway, or the weight of the vehicle.

ApplicationSpecification
Engine13B-REW
Model Year91/12 – 02/08
Remarks
FRONTREAR
Damping force adjustment30 steps30 steps
Base valve
Height adjustable lower bracket
Upper mountSpherical bearingSpherical bearing
Inverted/Normal typeNormalNormal
Damper/Spring layoutCoiloverCoilover
Spring rate change at factoryPossiblePossible
Damping force adjustment with wire
Helper spring
(Spring rate N/mm)
○ ( 19.8 )

 

Ride Heightmm
Factory *2Test dataAdjustable range
High – Low *3
Drivable range
High – Low *4
FRONTRide height *1636665 ~ 598665 ~ 628
Against stock-290 ~ -670 ~ -37
REARRide height *1642677 ~ 589677 ~ 589
Against stock-350 ~ -880 ~ -88
*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
FR
Spring rate N/mm(kgf/mm)157 ( 16 )157 ( 16 )
Free height (mm)200170
Spring typeStraightStraight
Recommended range to change spring rate N/mm(kgf/mm)-20 ( 2 )-20 ( 2 )
Specification of damper
FR
Damping force (Rebound/Damping)N*3109 / 5981893 / 392
Default position of dial1515
Remaining damper stroke (Rebound/Damping)mm28 / 5750 / 50
* The value of the damping force is at piston speed of 0.1m/sec.
Setting data
FR
DefaultTestDrivable limit
High *
Drivable limit
Low *
DefaultTestDrivable limit
High *
Drivable limit
Low *
Length of
case (mm)
373392370301323283
Spring
Set length(mm)
198198200223220243
Length to ride hight
adjuster (mm)
47664245707
Lever ratio1.491.40
* Refer to the above explanation *3 of ride height information for drivable high and low limitations.

 

Test vehicle information
FR
Vehicle weight kg650613
Tire size (Air pressure) kPa235 / 40 – 18 ( 220 )255 / 35 – 18 ( 220 )
Wheel size9.5 JJ × 18 off 3210 JJ × 18 off 45
Alignment
(Toe/Camber)
Test dataout 1 mm / 2°24′0 mm / 2°00′
Standard valuein 1 ± 3 mm / 0°05′ ± 45′in 2 ± 3 mm / -1°15′ ± 45′
* Test data at HKS.
Point
・The spring rate is a little high as 16kg, but the leverage is high and the damping force for bumping is set low, therefore it has less reaction to the road surface and have comfortable drivability.
・It’s not as hard as it seems for the rate, but set to move effectively. We set it for smooth rolling.
・To have a good rear stability, we set the stroke allocation and damping force for better braking and stable traction. It’s also set to have easy and smooth reverse steering control.

 

Additional information

Weight30 kg
Dimensions92 × 41 × 41 cm

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Applications

Models suitable for this product

MakeModelYearSubmodel
MakeModelYearSubmodel
MazdaRX-71991Base Turbo - 1.3L
MazdaRX-71992 - 1995Base Twin Turbo - 1.3L

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