Competition Clutch 1990-2005 Toyota Supra 14lb Steel Flywheel
The Competition Clutch 2-1JZ-ST is a 14 lb one-piece steel flywheel for manual-transmission builds running Toyota's 2.5-liter 1JZ inline-six: the 1JZ-GTE twin-turbo Supra and the many chassis that get a 1JZ swapped in. Buyers find it when a clutch job turns up a cracked or heat-spotted factory flywheel, when a boosted 1JZ starts to chatter on takeoff, or when they want the engine to rev and fall back faster for drifting and quick shifts.
The JZ family is a longitudinal, rear-wheel-drive engine, so the flywheel sits at the back of the crank and does three jobs: it carries the starter ring gear, it gives the clutch disc its rear friction face, and its mass carries the crank through the firing pulses at idle. A heavy stock flywheel smooths those pulses but makes the engine slow to gain and shed rpm between shifts. Competition Clutch machines the 2-1JZ-ST from 4140 forged chromoly as a single piece at a listed 14.00 lb. Being one piece, there is no pressed-on ring gear that can separate at high rpm, which CC calls out as the weak spot of multi-piece designs.
The ST (street) suffix matters. CC builds its ST flywheels to keep low-end torque and driveability, so a 1JZ still pulls away cleanly in traffic, while the ultra-light STU versions are aimed at track and high-boost cars. CC says this ST part suits Gravity, Stage 1 and Stage 2 clutch kits. If you are deciding how light to go, read lightweight vs. stock flywheel pros and cons.
A manual clutch and flywheel do not set trouble codes, so diagnosis is by feel and inspection.
Slip can also come from a worn disc, a weak pressure plate or a hydraulic release that will not fully retract, so check the slave cylinder and fluid first. Our slipping diagnosis guide helps separate true clutch slip from other drivetrain faults, and flare vs. slip explains what each feels like. With the gearbox out, look for cracks reaching the bolt holes or outer edge, deep scoring, and a face that has already been cut thin. If it is cracked or past its machining limit, replace it; see resurface vs. replace.
Competition Clutch lists the 2-1JZ-ST for 1990-2005 Toyota Supra and 1JZ engine swaps, naming 1JZ-GTE and 1JZ-GE applications. In practice that means the JZA70 Supra 2.5 Twin Turbo (sold in Japan with the 1JZ-GTE) and swap cars; the non-turbo 1JZ-GE was only ever paired with an automatic from the factory, so a 1JZ-GE application here is a manual conversion. One line on CC's page describes this item as fitting the 1993-1998 Supra Twin Turbo, which conflicts with its 1JZ fitment section, so do not assume it fits a 2JZ car. Tell us your engine, transmission (R154, W58 or other) and clutch kit before ordering and we will confirm. For a W58 build, CC makes a separate part, the 2-607-2S 13.47 lb flywheel. More flywheels are in our hard parts category.
Expect a quicker idle drop and slightly more throttle on hill starts than with the stock flywheel. Most drivers stop noticing within a few days.
| Brand | Competition Clutch |
| Part number | 2-1JZ-ST |
| Fits | Competition Clutch 1990-2005 Toyota Supra 14lb Steel Flywheel |
| Vehicle fitment | Toyota Supra 14Lb Steel (1990-2005) |
| Type | Flywheels |
| Condition | New |
| Ships | Same business day (in stock), from the USA |
| Warranty | 1-year |
Competition Clutch's fitment section names 1JZ-GTE and 1JZ-GE applications, but one item line on its page says 1993-1998 Supra Twin Turbo. Because of that conflict, send us your engine, transmission and VIN before ordering for any 2JZ car.
Competition Clutch lists 14.00 lb. It is a one-piece 4140 forged chromoly flywheel in CC's ST street series.
CC says its ST flywheels are well-suited to Gravity, Stage 1 and Stage 2 clutch kits. The flywheel is sold alone with no clutch included, so pick a kit rated for your boost and power.
CC makes a separate flywheel for 1JZ and 2JZ engines with the W58, part 2-607-2S. Tell us your exact transmission and clutch kit and we will confirm which one you need.
It revs up and drops faster than stock, so pulling away takes a little more throttle. CC built the ST line to keep low-end torque and street manners, which is why it is the street choice over the lighter STU parts.
Competition Clutch recommends shifting as often as possible during the first 500 miles so the disc material beds into the flywheel and pressure plate. Avoid hard launches until then.
