BC Racing Coilovers - 86-92 Mazda RX7 FC

Application: 86-92 Mazda RX7 FC

This listing puts the available BC Racing options for this fitment in one place so you can compare them without bouncing between separate products. BC builds these kits around application-specific spring rates, and several series can be ordered with custom rates or Swift spring upgrades where applicable.

Available options:

• BR Series - 30-click single-adjustable mono-tube. Independent ride height adjustment. Custom spring rates and Swift spring upgrades are available on applicable orders. Why you would choose it: Best for most street cars, weekend canyon runs, and track-day builds that want real adjustability without getting overly complicated.
• DS Series - 30-click single-adjustable mono-tube with a digressive piston for stronger low-speed control and crisper response. Why you would choose it: Choose this when you want sharper turn-in, better support in transitions, and a more aggressive feel than a standard linear-valved setup.
• ER Series - External reservoirs with independent compression and rebound adjustment, plus a linear twin-piston design for more tuning range and better heat control. Why you would choose it: This makes sense when the car sees regular hard driving or track time and you want more control than a one-knob coilover can give you.
• HM Series - Inverted mono-tube design with external reservoirs, independent compression and rebound adjustment, and Swift springs standard. Why you would choose it: Go HM when you want one of BC’s harder-core track options for demanding strut-car use and you actually need the extra thermal capacity and support.
• RM Series - Inverted mono-tube strut design with 30-click single adjustment and independent ride height control. Swift spring compatible. Why you would choose it: Good fit when you want the added rigidity of an inverted setup without stepping all the way into a remote-reservoir package.
• ZR Series - Remote reservoirs with 15 clicks of low-speed compression, 12 clicks of high-speed compression, 30 clicks of rebound, and Swift springs standard. Why you would choose it: Choose ZR for a serious dual-duty or competition build where you want a big tuning window and know how to use it.
• ZX Series - 3-way adjustable system with 20 clicks of low-speed compression, 12 clicks of high-speed compression, 30 clicks of rebound, and external reservoirs. Why you would choose it: This is the race-car answer. It is for serious track or competition use, not the option I would push for a normal street build.

Simple version: BR is the easy all-around answer, DS tightens the car up more, ER/HM/ZR/ZX are for builds chasing more track control, and RM is the inverted-strut option when that matters for the chassis.