XYZ Racing Circuit Master Coilovers — BMW 4 SERIES F83 M4 (Modified Rear Integrated) (Cancellation Kit for Electronic Damping) 2014-2020

The F83 M4 convertible’s factory electronic damping was tuned around a car that also has to ride comfortably on a run to the shops, which is exactly the compromise a dedicated circuit build doesn’t need. Fitting the Circuit Master kit with the cancellation module removes that factory damper logic entirely and hands full control to the coilover’s own valving, so the S55’s power delivery through hard corner exits isn’t fighting a suspension system still trying to second-guess road conditions.

For owners running sustained track sessions rather than the odd trackday, that distinction matters. The F83’s extra convertible bracing mass sits low but wide, and consistent, driver-set damping through a full lap – rather than a system cycling between comfort and sport maps – is what keeps the car predictable when you’re carrying speed into turn one for the tenth time in a session.

What this coilover does for your 2014-2020 Bmw 4 Series

With the electronic damper cancellation kit installed, the Circuit Master’s 3 external knobs give you direct mechanical control over compression and rebound instead of routing requests through the car’s iDrive-linked EDC. That means the front axle load transfer under trail braking into a hairpin responds the way you set it, lap to lap, rather than the way BMW’s software decided a road car should respond. Monotube construction keeps oil temperatures more stable than a twin-tube design under the repeated heat cycling a circuit session generates, which matters on the F83’s heavier convertible shell. Ride height is adjustable independently of spring preload, so you can drop the car for a lower centre of gravity without changing the loaded spring rate you’ve settled on.

About the Circuit Master coilover

Circuit Master sits at the top of XYZ Racing’s range, built specifically around circuit and competitive track use rather than fast-road duty. The damper has been run by XYZ-affiliated racing teams across a number of circuits internationally, with development feedback folded back into the valving rather than treated as a one-off spec. Adjustment is spread across roughly 9720 combinations through the 3 external knobs, giving a wide enough window to move from a soft, forgiving setup toward something stiff enough for a qualifying-lap attitude without swapping hardware. The small-orifice damper construction that makes that adjustment range possible can produce a faint noise as oil passes through the narrow internal channel over larger bumps; on a car built for circuit driving rather than broken B-roads, this is a known characteristic of the design rather than a fault. For this specific application, the kit includes the cancellation module needed to stop the F83’s factory EDC system from overriding or fighting the new mechanical damping.

Fitment for the Bmw 4 Series F83 M4 (Modified Rr Integrated) (Cancellation Kit for Electronic Damping) (2014-2020)

This kit is built for the F83-chassis M4 convertible, model years 2014 to 2020, specifically for cars fitted with the modified rear-integrated setup and factory electronic damping. The included cancellation kit is required for this fitment so the car’s EDC system doesn’t attempt to override the new coilover’s damping signal after installation.

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Configure your Circuit Master spec for the F83 M4 below and choose the damping and ride height that match how you’ll actually use the car.