Clutch Masters 2023 Toyota Supra MK5 3.0L Turbo 6-Speed Lightweight Steel Flywheel
Clutch Masters FW-340-SF is a lightweight single-mass steel flywheel for the 2023 Toyota GR Supra MK5 with the 3.0L B58 turbo engine and the six-speed manual. It is the part you buy when you are upgrading the clutch and want to get rid of the factory dual-mass flywheel, or when that dual-mass unit has started to rattle, clunk or shudder and you would rather replace it with something lighter and simpler than another stock one.
Toyota built the manual Supra with a single-disc clutch bolted to what Clutch Masters calls a chunky dual-mass flywheel. A dual-mass flywheel has two halves joined by internal springs that soak up B58 firing pulses, which keeps the car quiet but adds rotating weight and another wear item. FW-340-SF replaces that assembly with one solid steel piece. Less rotating mass lets the engine rev up and drop rpm faster between shifts, which is why Clutch Masters says there are big gains in ditching the dual-mass unit and expects most owners upgrading the clutch to go that way.
It is also the correct base for the Clutch Masters Short Shift single-disc kits with sprung-hub discs. Clutch Masters states that if you keep the factory dual-mass flywheel, the kit has to be built with a rigid-hub disc instead. In other words, sprung disc plus this flywheel, or rigid disc plus the stock flywheel. Do not mix a rigid race disc with a solid flywheel on a street car unless you accept the noise.
A failing flywheel usually does not set its own trouble code, so diagnose by feel and inspection.
With the engine idling in neutral, listen near the bellhousing and press the clutch pedal. A rattle that changes or stops points toward the dual-mass flywheel or release bearing. If the complaint is slip rather than noise, log a fourth-gear pull and compare engine speed to road speed. Our slipping diagnosis guide covers that test, and flare vs. slip helps rule out a tuning issue. Once the transmission is out, check the dual-mass flywheel for free play between the two halves and heat spots on the friction face.
This listing is the Clutch Masters steel flywheel for the 2023 Toyota Supra 3.0L turbo with the six-speed manual. Clutch Masters describes it as a B58 six-speed flywheel and also lists it for the 2016-2018 BMW 340i and 2017-2018 BMW 440i with the B58 and manual gearbox. It does not fit eight-speed automatic cars, which use a flexplate, or the 2.0L four-cylinder. Later Supra model years and BMW owners should send year and VIN so we can confirm the part number before it ships. Pair it with a clutch built for a single-mass flywheel, such as the 16340-SSC6 FX400 Short Shift kit, or compare with the FW-340-AL aluminum flywheel. More clutch parts are in our rebuild kits section.
Clutch Masters sells the Supra flywheel in both steel (FW-340-SF) and aluminum (FW-340-AL). Steel keeps more mass than aluminum, so it is the friendlier choice for a car that sees traffic: easier pull-aways, less bog on hill starts and more heat capacity for repeated launches. Aluminum suits a track or drift car where fast revs matter more than street manners.
| Brand | Clutch Masters |
| Part number | FW-340-SF |
| Fits | Clutch Masters 2023 Toyota Supra MK5 3.0L Turbo 6-Speed Lightweight Steel Flywheel |
| Vehicle fitment | Toyota Supra Mk5 (2023) |
| Type | Flywheels |
| Condition | New |
| Ships | Same business day (in stock), from the USA |
| Warranty | 1-year |
No. It is for the 3.0L B58 with the six-speed manual. Automatic cars use a flexplate, not a flywheel.
It is designed to be used with a Clutch Masters single-disc kit. Clutch Masters builds its MK5 kits with a sprung-hub disc for use with its lightweight flywheels, and with a rigid-hub disc only for cars keeping the factory dual-mass flywheel. Send us your clutch part number if you are unsure.
Usually a little. A single-mass flywheel does not damp engine pulses the way a dual-mass unit does, so some gear rattle at idle is normal. A sprung-hub disc helps.
Steel. It keeps more inertia, so pull-aways and hill starts are easier and it handles repeated launches with more heat capacity. Aluminum is lighter and better suited to track or drift use.
Clutch Masters lists FW-340-SF for the 2016-2018 BMW 340i and 2017-2018 440i manual with the B58. Send year and VIN so we can confirm before shipping.
