Competition Clutch Ultra-Light Flywheel for K20A2/A3/Z1/Z3

Competition Clutch 8.8 lb Ultra Light Steel Flywheel for K20 Engines

Picking a K-series flywheel isn’t about slapping on whatever your favorite brand sells. You’re choosing how your 2002–2005 Civic Si, 2006–2011 Civic Si, or 2002–2006 RSX actually feels every time you stab the throttle or grab the next gear. This Competition Clutch Ultra-Light Flywheel targets reduced rotating mass and consistent behavior, not just a big weight-drop number.

At 8.8 lb, it’s dramatically lighter than the stock Honda K20 flywheel, so the engine spins up and drops revs much faster. That means sharper throttle response, easier rev-matching, and a more connected feel between the engine and the rest of the K-series drivetrain. Instead of a thin aluminum unit, this is a one-piece 4140 forged steel flywheel, built to deal with heat, torque, and repeated launches without turning into a paperweight after a season.

Why flywheel material matters

Most K20 lightweight flywheels fall into two camps: aluminum or steel. Both work, but they don’t behave the same on a hard-driven street or track car. If you’re serious about Honda performance parts and Acura performance parts, the material choice matters more than the logo on the box.

Forged steel, like this Competition Clutch flywheel, soaks and sheds heat better than aluminum and gives you a more predictable pedal feel when things get hot. That’s why a lot of turbo K20A2/K20A3/K20Z1/K20Z3 builds, road-race cars, and endurance setups lean toward a 4140 forged steel flywheel instead of the lightest possible unit.

• Much better resistance to heat-related warping and hotspots
• More consistent clutch engagement when you’re on it lap after lap
• Can be resurfaced like an OEM flywheel instead of thrown away
• Well-suited to forced induction, track days, and extended abuse

Aluminum flywheels can come in lighter and may rev slightly quicker, but they give up heat capacity and usually transmit more gear noise and chatter into the cabin. A steel one-piece flywheel like this strikes a more realistic balance: real performance gain, good lifespan, and fewer compromises for a daily-driven car.

What to expect in real-world driving

Dropping this 8.8 lb flywheel into your EP3, DC5, FA5, or FG2 changes how the car reacts everywhere on the tach. The engine spins up faster, and it also drops RPM quicker between shifts. You’ll notice it the first time you try a heel-toe downshift or stab the gas to pass.

• Sharper, more immediate throttle response
• Faster rev climb and drop for tighter shift windows
• Less rev hang between gears, especially on aggressive driving
• More precise timing for heel-toe downshift improvement

How “streetable” it feels depends a lot on your clutch and tune. With a full-face, street-style disc, this daily-drivable performance flywheel behaves well enough for commuting and stop-and-go traffic. If you pair it with a harsh puck-style disc, expect extra noise and some chatter at low RPM. That’s normal for any ultra light flywheel and clutch combo, not just this one.

Why it matters

• Faster revs, faster shifts – less rotating mass means a quick revving flywheel, crisper blips, and less synchro stress when you’re banging down gears into a corner.
• Forged 4140 one-piece steel – the ring gear and friction area are one solid piece, which helps prevent the separation and heat issues that cheaper 2-piece flywheels can have.
• SFI-approved strength – SFI approved flywheel construction gives you confidence at high RPM and under big torque, from nitrous or boost, without feeling sketchy at 9–10k.
• Serviceable & versatile – you can resurface this flywheel like OEM when it’s time for a clutch, and it works with stock-diameter K20 clutch and flywheel kits from mild to aggressive.
• Direct K-series fitment – bolts right onto 2002–2005 EP3 Civic Si, 2006–2011 FA5/FG2 Civic Si, and 2002–2006 DC5 RSX (Base & Type-S) with no spacers, shims, or weird hardware.

Technical highlights

• Weight: 8.8 lb (often around 40% lighter in K20 flywheel weight comparison vs typical OEM units)
• Material: CNC-machined flywheel from 4140 forged steel with a nitrided ring gear
• Friction surface: stepped to maintain OE stack height; 230 mm disc diameter
• Balance: zero-balanced for smooth operation on high rpm flywheel setups
• Made in the USA by Competition Clutch, with a 90-day limited warranty.

If you’re comparing lightweight vs OEM flywheel K-series parts and wondering how much a lightweight flywheel helps a Civic Si or RSX, this 8.8 lb Competition Clutch flywheel sits in the sweet spot. It’s light enough for a track-ready flywheel that helps with quicker turbo spool and sharper response, but still realistic for a street car you drive every day. We use these same Competition Clutch Ultra-Light Flywheel units in our own K-series builds, and they behave exactly how you’d want from a serious Honda K-series performance parts upgrade.

Installation Snapshot

Intermediate DIY with a lift or sturdy jack/stands. Plan on 3–4 hours including trans removal. This K20A2/K20A3/K20Z1/K20Z3 flywheel includes the flywheel itself plus alignment dowels and a new pilot bearing. Reuse or replace your OEM flywheel bolts as needed. No resurfacing flywheel work, custom machining, or tuning is required for installation.