H&R Street Performance Coilover – BMW Z4 (E89, N52/N54)

OVERVIEW

The H&R Street Performance coil over system replaces the factory struts and springs on the E89 BMW Z4 with fully threaded shock bodies and matched progressive-rate H&R springs. Ride height is set at the spring seat, so you choose the drop that suits the car rather than accepting a single fixed lowering figure.

Custom damper valving is paired with the progressive rate springs to keep the chassis composed without making the car unusable on the street. Lowering the center of gravity reduces body roll and improves turn-in and chassis balance, and the reduced fender gap gives the Z4 a noticeably more aggressive stance.

H&R springs are crafted from a special 54SiCr6 spring steel and shot-peened to increase their life by more than 200%. All production is completed by H&R in-house, and every spring is 100% tested before leaving the ISO9001-certified production facility in Germany.

SPECS

• Approximate front lowering: 1.2" – 2.2" (height adjustable)
• Approximate rear lowering: 1.0" – 2.0" (height adjustable)
• Fully threaded shock bodies — ride height adjusted at the spring seat
• Custom damper valving matched to progressive-rate H&R springs
• Springs crafted from special 54SiCr6 spring steel
• Shot-peened to increase spring life by more than 200%
• All production completed in-house in Germany; each spring 100% tested
• Built to TÜV and ISO9001 quality assurance standards

PARTS INCLUDED

• Complete H&R Street Performance coil over kit as supplied by H&R Springs — fully threaded front and rear shock bodies with matched progressive-rate springs. See the installation instructions for the full bill of materials.

TECH RESOURCES

Additional Parts Required

• None. H&R specifies no additional hardware for this coil over kit.
• Four-wheel alignment after installation — H&R states that alignment must be checked after any suspension ride height modification.
• Professional installation — H&R states that its springs and suspensions should be installed by professional suspension mechanics only.
• Spanner/coil over wrenches and standard strut service tools, supplied by the installer, are needed to set and lock ride height.
• Confirm the car is not fitted with electronic/adaptive damper control before ordering — this is a passive, non-electronic coil over system.

Installation

• H&R Technical Information & Installation Guide (PDF) — spring markings, ride height measurement and adjustment, bumpstop trimming table, alignment requirements.
• Follow the factory service manual procedure for strut and spring replacement on the E89 chassis.

Notes

• Confirm fitment with Speed Logic before ordering.

PART NUMBER

• 28981-1

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