HKS Hipermax MAX IV SP Drag Coilovers – Toyota GR Supra A90 (2020)

OVERVIEW

The MAX IV SP Drag is HKS's drag-racing coilover for the GR Supra, a return of HKS's drag-spec dampers updated for modern drag cars. The factory suspension is set up to find traction at both ends for every situation. This kit is built for one job: putting power into the rear tires off the line and keeping it there.

The rear damper carries a bump rubber that works as an additional spring, so the kit can cope with more power and stickier tires as the car develops. Both ends are full-length adjustable, which means the stroke ratio and bump-touch timing can be changed without changing ride height — shortening the rear damper delays bump touch and increases nose-up on launch. In HKS's own launch-control testing, the drag setup was about a second quicker to 100 km/h than stock, with less loss in the wheelspin zone. The front uses HKS's inverted strut with a dedicated outer cover, and the rear uses a lightweight billet aluminum upper plate. Straight-wound springs make rate changes easy.

This is a drag-only product and is not intended for street or circuit use. HKS lists it for the DB42 GR Supra 3.0 built through September 2020. Two versions are offered: 80250-AT003D without the canceler, and 80250-AT003DC with the Suspension Error Canceler included.

SPECS

• Type: full drag coilover kit, four corners
• Front: inverted strut with HKS outer cover
• Rear: separated damper and spring, billet aluminum upper plate, bump rubber acting as an additional spring
• Damping adjustment: 30 steps front and rear
• Full-length adjustable bodies: change stroke ratio without changing ride height
• Spring rates: front 59 N/mm (6 kgf/mm), rear 98 N/mm (10 kgf/mm)
• Spring free length: front 200 mm, rear 250 mm
• Ride height: front −22 mm default (−17 to −61 mm), rear −20 mm default (−12 to −75 mm)
• 80250-AT003DC: Suspension Error Canceler included
• Made in Japan

PARTS INCLUDED

• 80250-AT003D: two front inverted struts, two rear dampers, front and rear springs, mounting hardware and HKS installation manual
• 80250-AT003DC: everything in 80250-AT003D plus the HKS Suspension Error Canceler (45012-AT001)

TECH RESOURCES

• Required extra for 80250-AT003D: the HKS Suspension Error Canceler 45012-AT001, sold separately, to stop the suspension fault message once the factory adaptive dampers are removed. Or choose 80250-AT003DC, which already includes it. Do not buy both.
• Required after install: a full four-wheel alignment.
• Installation manual, 80250-AT003D (HKS): 80250-AT003D MAX IV SP Drag installation manual (PDF)
• Installation manual, 80250-AT003DC (HKS): 80250-AT003DC MAX IV SP Drag with canceler installation manual (PDF)
• Installation notes: professional installation recommended. HKS's factory damper-length settings were the quickest in its drag testing; fine-tune rear damper length to suit your car and track.
• Use: drag racing only. HKS notes this suspension may make noise during stroke. Not intended for street or circuit use.
• Fitment: HKS lists DB42 GR Supra 3.0 cars built May 2019 – September 2020 only. Confirm your car's build date before ordering.
• Price is for the item selected only; labor is not included.

PART NUMBER

• 80250-AT003D — HKS Hipermax MAX IV SP Drag Full Kit, GR Supra DB42
• 80250-AT003DC — HKS Hipermax MAX IV SP Drag Full Kit with Suspension Error Canceler, GR Supra DB42

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