Code No. 80310-AZ004
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
HIPERMAX R for the Roadster, Evolved with the Latest Technology
- The Roadster's suspension has been refined with cutting-edge technology to deliver both everyday comfort and sharp, responsive cornering. Spring rates and damping force have been pushed to the limit for a sporty, lightweight feel on winding roads and circuits.
- The specially designed “LVS” springs offer more flexibility than their set rate, providing a smooth ride in the city and firm, stable handling during spirited driving—even at the limit.
- A front spring retainer reduces side forces, allowing smoother suspension movement and better road tracking. In the rear, a helper spring ensures enough extension stroke to maximize inner rear tire grip during circuit runs.
- Tested at Fuji Speedway with A052 tires, the recommended damper settings are 10 clicks front, 12 clicks rear. This height-adjustable kit unleashes the full potential of the Roadster, whether on the street or the track.
The model in the photo is NA8C.
Application
| Engine | BP-ZE |
|---|---|
| Model Year | 93/08 - 98/01 |
| Remarks |
Specification
| FRONT | REAR | |
|---|---|---|
| Damping force adjustment | 30 steps | 30 steps |
| Base valve | - | - |
| Height adjustable lower bracket | 〇 | 〇 |
| Upper mount | Spherical bearing | Spherical bearing |
| Inverted/Normal type | Normal | Normal |
| Damper/Spring layout | Coilover | Coilover |
| Spring rate change at factory | Possible | Possible |
| Damping force adjustment with wire | - | 左のみ |
| Helper spring (Spring rate N/mm) | 〇 (41.4) | 〇 (41.4) |
| Factory *2 | Test data | Adjustable range High - Low *3 |
Drivable range High - Low *4 |
||
|---|---|---|---|---|---|
| FRONT | Ride height *1 | 605 | 578 | 624 ～ 560 | 624 ～ 560 |
| Against stock | -18 | -45 | 1 ～ -63 | 1 ～ -63 | |
| REAR | Ride height *1 | 615 | 585 | 640 ～ 572 | 640 ～ 572 |
| Against stock | -24 | -54 | 1 ～ -67 | 1 ～ -67 | |
*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) | 118 ( 12.0 ) | 118 ( 12.0 ) |
| Free height (mm) | 150 | 150 |
| 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* | 711 / 456 | 456 / 559 |
| Default position of dial | 15 | 15 |
| Remaining damper stroke (Rebound/Damping)mm | 30 / 42 | 38 / 34 |
* 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) |
317 | 299 | 325 | 299 | 245 | 223 | 245 | 218 |
| Spring Set length(mm) |
175 | ← | 170 | 187 | 185 | ← | 167 | 189 |
| Length to ride hight adjuster (mm) |
83 | 65 | 96 | 53 | 36 | 14 | 54 | 5 |
| Lever ratio | 1.49 | 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 | 542 (520) | 488 (470) | |
| Tire size (Air pressure) kPa | 195 / 50 - 15 ( 180 ) | 195 / 50 - 15 ( 180 ) | |
| Wheel size | 7.5 JJ × 15 inset 33 | 7.5 JJ × 15 inset 33 | |
| Alignment (Toe/Camber) |
Test data | out 1 mm / -2°05' | in 2 mm / -2°32' |
| Standard value | in 3 ± 3 mm / 0°20' ± 0°45' | in 3 ± 3 mm / -1°08' ± 0°30' | |
* Test data at HKS.
Developer’s comments
- Due to the NA/NB Roadster’s short rear suspension, it’s difficult to secure stroke. To address this, we omitted rear spring retainers to create space for helper springs, maximizing rear extension stroke—crucial for FR traction and reducing abrupt behavior common in short-wheelbase cars.
- The suspension is tuned slightly toward circuit driving, with a focus on stability and control. For everyday city use, setting the damping dial to 20–30 clicks offers a more comfortable ride.
- We also offer a ±2K spring rate change service front and rear. If you mainly drive on mini circuits, use lower-grip tires than the A052s used in testing, or prefer more active load transfer, you can choose softer rates to match your driving style.
- For NB models or cars with aftermarket reinforced front upper arms, check for possible contact between the damper and reinforcement. If necessary, adjust camber or take other steps to avoid interference during installation.
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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