Dinan Performance Spring Set – BMW 435i / 440i xDrive

OVERVIEW

Dinan suspension systems are known for transforming a car’s stance while maintaining ride quality and improving handling. That is achieved by pairing spring sets with bump stops, spring perches or both so suspension travel is preserved — the ride stays smooth while mechanical grip and body control improve. Dinan sells the components separately, but strongly recommends the spring set and the matching ride quality and handling kit be used together.

The Performance Spring set for the F32 435i/440i xDrive gives greater control over body roll through carefully calibrated spring rates, and lowers the car 3/4 in at the front and a full inch at the rear for improved suspension geometry and a more aggressive stance. The springs are CNC wound from high-tensile chrome silicon wire and shot-peened for stress relief so they last the life of the car.

The 38% increase in front stiffness and 50% increase at the rear reduce rear suspension compression under acceleration and front-end dive under braking, giving the car a more controlled feel. Grip improves noticeably in high-speed driving, and the reduced body roll makes the steering more responsive to driver input from low speeds all the way to the top of the range.

SPECS

• Lowers the vehicle 3/4 in at the front and 1 in at the rear
• Front spring rate increased 38%; rear spring rate increased 50%
• CNC wound from high-tensile chrome silicon wire and shot-peened for stress relief
• Preset at the factory to prevent spring sag
• Compatible with both conventional and factory electronic (EDC) shocks
• Substantial reduction in body roll
• Dinan states the set is not compatible with RWD models or convertible variants
• Dinan published installation labor: 8.2 hours
• Kit weight: 25 lb
• Dinan emissions statement: “This part is legal for sale or use on Emissions Controlled Vehicles, Uncontrolled (Non-Emissions Controlled) Vehicles, and Racing Use Only Vehicles because it does not affect vehicle emissions and is not covered by emissions regulations.”
• Dinan warranty: on a vehicle still covered by the BMW new-car limited warranty (4 years/50,000 miles), Dinan products are warranted for the remaining term of that warranty; otherwise Dinan Performance Products carry a 2-year, unlimited-mileage warranty from the date of original purchase. Wear and maintenance items — friction materials, filters, fluids, spark plugs, drive belts and bulbs — are excluded.

PARTS INCLUDED

• Complete front and rear Dinan performance coil spring set as supplied by Dinan.
• See the Dinan installation documentation supplied with the kit for the full bill of materials.

TECH RESOURCES

Additional Parts Required

• Dinan Supplemental Ride Quality and Handling Kit (Dinan part D193-3201 for F32 cars). Dinan specifies this kit alongside the spring set to achieve the advertised ride height and ride quality; without it Dinan will not warrant handling or ride-quality complaints. It is not currently a listed product at Speed Logic — contact us and we will source it with your springs.
• Four-wheel alignment — Speed Logic recommends a full alignment after installation and after any later ride-height change.
• Installer-supplied tools: spring compressor, torque wrench and the standard BMW suspension service tools.

Installation

• Dinan D100-0920 suspension specification sheet (the reference document Dinan publishes for this spring set): Download PDF
• Dinan supplies printed installation instructions in the box with the kit. Speed Logic could not confirm a separate downloadable installation PDF for D100-0920 — contact us if you need a copy before purchase.

Notes

• NOTE: Dinan Performance Spring sets should be purchased and installed with the corresponding Ride Quality and Handling Kit to achieve the advertised ride height, performance and ride quality. While not explicitly required, if the matching component is not purchased and installed you will get less than favorable results in the form of poor ride quality and improper handling traits. While Dinan will maintain a full warranty on product defects, any claims against the car’s improper handling or ride quality traits due to not purchasing the corresponding handling kit will not be warranted.
• Dinan does not publish model years for D100-0920 in a form Speed Logic could confirm, so the Years column is left blank rather than estimated. This is an xDrive-only spring set and Dinan states it does not fit RWD or convertible variants. Please confirm fitment with Speed Logic before ordering.

PART NUMBER

• D100-0920

VEHICLE APPLICATIONS