Code No. 80310-AZ003
The fun of controlling it at will and the versatility to adapt to anything from circuits to winding roads
The ultimate multi-performer with a refined ride feel
■Features
- Utilizing the latest technology, we have succeeded in achieving a higher spring rate, while keeping everyday use in mind, and have been able to improve driving performance.
- The structural weaknesses of the rear have been resolved with new dedicated parts, allowing for a wide range of vehicle height adjustment and the use of longer springs. Compared to the MAX IV SP, the shape has evolved to make vehicle height adjustment easier, as it does not require removing and installing the springs to adjust the rear height.
- The adoption of a new dedicated rear part, the helper spring, ensures sufficient extension stroke, and is designed to increase grip of the inside rear tire on the circuit.
Application
| Engine | 13B-MSP |
|---|---|
| Model Year | 03/04 - 12/06 |
| Remarks |
Specification
| FRONT | REAR | |
|---|---|---|
| Damping force adjustment | 30 steps | 30 steps |
| Base valve | - | - |
| Height adjustable lower bracket | 〇 | 〇 |
| Upper mount | Spherical bearing | Stock |
| Inverted/Normal type | Normal | Normal |
| Damper/Spring layout | Coilover | Coilover |
| Spring rate change at factory | Possible | Impossible |
| Damping force adjustment with wire | - | 〇 |
| Helper spring (Spring rate N/mm) | 〇 (19.8) | 〇 (19.8) |
| Factory *2 | Test data | Adjustable range High - Low *3 |
Drivable range High - Low *4 |
||
|---|---|---|---|---|---|
| FRONT | Ride height *1 | 666 | 659 | 685 ～ 618 | 685 ～ 618 |
| Against stock | -19 | -26 | 0 ～ -67 | 0 ～ -67 | |
| REAR | Ride height *1 | 667 | 664 | 685 ～ 639 | 685 ～ 639 |
| Against stock | -18 | -21 | 0 ～ -46 | 0 ～ -46 | |
*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) | 196 ( 20.0 ) | 118 ( 12.0 ) |
| Free height (mm) | 150 | - |
| Spring type | Straight | Special shape |
| Recommended range to change spring rate N/mm(kgf/mm) | ±20 ( 2 ) | - |
Specification of damper
| F | R | |
|---|---|---|
| Damping force (Rebound/Damping)N* | 1648 / 510 | 839 / 407 |
| Default position of dial | 15 | 15 |
| Remaining damper stroke (Rebound/Damping)mm | 40 / 47 | 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) |
366 | 361 | 376 | 336 | 403 | 400 | 421 | 377 |
| Spring Set length(mm) |
205 | ← | 202 | 208 | 239 | ← | 239 | 241 |
| Length to ride hight adjuster (mm) |
58 | 53 | 71 | 25 | 42 | 39 | 60 | 14 |
| Lever ratio | 1.45 | 1.00 | ||||||
* Refer to the above explanation *3 of ride height information for drivable high and low limitations.
Test vehicle information
| F | R | ||
|---|---|---|---|
| Vehicle weight kg | - (680) | - (630) | |
| Tire size (Air pressure) kPa | 225 / 45 - 18 ( 230 ) | 225 / 45 - 18 ( 230 ) | |
| Wheel size | 8 JJ × 18 inset 50 | 8 JJ × 18 inset 50 | |
| Alignment (Toe/Camber) |
Test data | out 2 mm / -3°30' | in 3 mm / -3°09' |
| Standard value | in 2 ± 3 mm / 0°00' ± 1°00' | in 3 ± 3 mm / -1°30' ± 1°00' | |
* Test data at HKS.
■Developer’s comments
- To address the RX-8's unique problem of difficulty in securing rear stroke, we have adopted a newly designed rear case and helper spring to ensure a larger stroke amount. The rear stroke is secured with the aim of suppressing the spin of the inside rear tire, not only with a mechanical LSD but also with the original LSD.
- The circuit test was conducted with the standard size 265/35R18 (ADVAN A052) based on the concept of "specifications close to the user's usage conditions."
- The vehicle height adjustment range was selected so that ground clearance could be secured even with the above tire size. It was designed with the possibility of further development after purchase, such as increasing camber beyond the original arm state, and with the aim of improving lap times in mind.
Newly developed oil SRF
We have developed a special oil with high viscosity that is resistant to heat dissipation. In addition, the damping starts from the very low speed range, providing reliable handling, good stability, and excellent feel.
※SRF:Super Response Fluid
Dedicated spring LVS
A newly developed dedicated spring made of high-strength wire material that is ideal for sports driving. It provides excellent response and a smooth ride.
※LVS:Low Vibration Spring
Spring Retainer
A retainer is standardly equipped on the top of the spring. No side force is generated, realizing low friction. It follows posture changes firmly and improves driving stability.
■Parts List * It may be changed without prior notice.
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