Name: HKS HIPERMAX S Coilover Suspension Full Kit for GR86/BRZ Gen1 80300-AT027
Availability: InStock

Description

The HKS HIPERMAX S redefines “driving comfort” for the GR86/BRZ, moving beyond mere fun to deliver a sophisticated, smooth, and composed driving experience. Engineered with a focus on refined daily usability, stylish lowering, and graceful handling, it utilizes the benefits of large-diameter pistons to provide sharp yet supple damping control. Through meticulous tuning of initial response and spring rates (including 0.5K rear increments for the first time), it achieves an exceptional balance—offering plush ride comfort without sacrificing the tension and capability needed for spirited driving on winding roads or circuits.

Product Highlights

🛋️ Redefining “Driving Comfort” – Smooth & Composed
The HIPERMAX S philosophy prioritizes a smooth, refined, and comfortable daily driving experience. It eliminates harshness and unnecessary body motion, transforming the GR86/BRZ into a more sophisticated and enjoyable grand tourer, without dulling its sporty character.

📐 Precision Damping for Refined Control
Leveraging the benefits of large-diameter pistons, HKS engineered a damping profile that provides sharp initial response for precise handling while meticulously controlling high-speed damping to prevent stiffness over bumps. The result is a ride that feels both taut and supple.

🌊 Meticulously Tuned Spring Rates for Perfect Balance
Spring rates were carefully selected in 1K (front) and 0.5K (rear) increments through extensive testing. This allows for fine-tuning the balance between comfort and control. The included rates (5.0 kgf/mm F / 6.5 kgf/mm R) are optimized for a comfortable yet engaging street feel.

🎛️ Wide-Range Adjustability for Personalized Driving

30-Step Damping Adjustment (F/R): Easily tune from a plush, comfortable setting to a firmer, more responsive feel for backroad driving.
Full-Length Ride Height Adjustment: Achieve your desired stylish lowering (approx. -26mm F / -28mm R at shipment settings) while maintaining proper damper stroke.
Spring Rate Change Option: Spring rates can be changed at the time of purchase to tailor the car’s character to your preference (see specifications).

🔇 Optimized for Reduced NVH
Features a rubber rear upper mount (vs. pillowball on the ‘R’ model) to further isolate road noise and vibration from the cabin, enhancing daily comfort.

■ Fitment/Installation Information

Engine model	FA24
year model	21/10 –
remarks	Checked on SZ 18-inch MT

Technical Specifications

Product Name: HIPERMAX S
Model Code: 80300-AT027
Compatibility: Toyota GR86 / Subaru BRZ (ZN8/ZD8, FA24, 2021+). Verified on SZ grade 18-inch MT.
Damping Adjustment: 30-step (Front & Rear)
Construction: Front Inverted / Rear Upright Monotube
Upper Mount: Front Pillowball / Rear Rubber
Adjustment: Full-length ride height
Rear Helper Spring: Included (19.8 N/mm)

Spring Rates (Full Kit Setting):

Front: 49 N/mm (5.0 kgf/mm)
Rear: 64 N/mm (6.5 kgf/mm) with Helper Spring
Change Options: Front: Up to +20 N/mm (Straight Wound Only). Rear: 49, 59, 69, 78 N/mm available.

Recommended Ride Height (Fender to Ground):

Front: 644mm (Shipment) | Adjustable 614mm – 670mm
Rear: 647mm (Shipment) | Adjustable 614mm – 675mm

Recommended Alignment (Tested):

Front: Toe Out 1mm, Camber -2°00′
Rear: Toe In 1mm, Camber -2°00′

■ Specifications

	FRONT	REAR
Damping force adjustment	30 steps	30 steps
Base valve	–	–
Full length adjustment	〇	〇
Upper Mount	Piro	rubber
Inverted/Upright	Handstand	upright
Damper/spring configuration	Integrated type	Integrated type
Spring rate changed at time of shipment	Possible	Possible
Damping force adjustment with wire	–	–
Helper spring (spring rate N/mm)	–	Yes (19.8)

■ Vehicle height informationmm

		At time of shipment*2	During testing	Maximum upper limit to maximum lower limit*3	Upper limit of drivable range – Lower limit of drivable range*4
FRONT	Vehicle height*1	644	←	670 to 614	670 to 614
FRONT	Normal ratio	-26	←	0 to -56	0 to -56
REAR	Vehicle height*1	647	←	675 to 614	675 to 614
REAR	Normal ratio	-28	←	0 to -61	0 to -61

Performance Philosophy

Goal: To provide a significant upgrade in ride quality, composure, and style over stock, while retaining enough performance intent for enjoyable backroad and occasional light track use.
Focus: Smoothness, refinement, and daily driving pleasure. It is the ideal choice for owners who use their GR86/BRZ as a daily driver and want enhanced comfort with improved looks and poise.

■ Kit information

● Full kit setting spring

	F	R
Spring rate N/mm (kgf/mm)	49 ( 5.0 )	64 ( 6.5 )
Free length (mm)	170	170
Spring Type	Straight barrel type	Straight barrel type
Recommended range when changing spring rate: N/mm (kgf/mm)	+20 (2)※	+15(1.5), -15(1.5)※

● Damper specs

	F	R
Damping force (rebound/compression) N*	392 / 387	432 / 495
Dial position at time of shipment	15	15
Damper remaining stroke (extension side/compression side) mm	42 / 45	53 / 53

*The damping force value is the value when the piston speed is 0.1 m/sec.

● Setting data

	F				R
	At the time of shipment	During testing	Maximum driving limit *	Lower limit of driving range *	At the time of shipment	During testing	Maximum driving limit *	Lower limit of driving range *
Case length (mm)	224	←	250	204	249	←	271	235
Spring set length (mm)	160	←	160	170	214	←	214	226
Winding dimensions (mm)	45	←	71	15	36	←	58	10
Lever ratio	1.00				1.26

*For the upper and lower limits of the vehicle height, please refer to the vehicle height information column above *3.

*5 Upgrading the front rate is supported by a straight wound spring. The rear rate can be changed to 5K, 6K, 7K, or 8K. 5K is supported by a straight wound barrel spring.

■ Test vehicle information

		F	R
Vehicle weight (catalog value) kg		– (700)	– (560)
Tire size (air pressure) kPa		215 / 40 – 18 ( 240 )	215 / 40 – 18 ( 240 )
Wheel size		7.5 JJ x 18 inset 48	7.5 JJ x 18 inset 48
Alignment (toe/camber)	During testing	out 1 mm / -2°00′	in 1 mm / -2°00′
Alignment (toe/camber)	Reference value	in 0 ± 2 mm / 0°00′ ± 0°45′	in 2 ± 2 mm / -1°10′ ± 0°45′

*These are measurements taken by our company.

■Configuration diagram　*Subject to change due to specification changes.

Installation & Tuning Notes

🔧 Professional Installation & Alignment Recommended
For optimal ride quality and performance, have the system installed and aligned by a professional shop. Use the provided ride height and alignment data as a proven starting point.

⚖️ Automatic Transmission Vehicles – Special Note
Due to weight differences, AT vehicles will sit lower in the front. It is advised to adjust the front case length during installation based on test data to restore optimal front/rear ride height balance and performance.

🎛️ Dialing in Your Preference

For maximum comfort, start with the damping dials at 20-25 clicks.
For more spirited driving, dial towards 10-15 clicks.
Avoid settings that are too soft, as they can induce unwanted bounce.

🔄 Custom Spring Rate Selection
If you desire a slightly sportier or more comfort-oriented feel from the start, consult with your retailer about the available spring rate change options at the time of purchase.