ACT XACT Flywheel Prolite
The ACT 600230 is an XACT Prolite flywheel for the Nissan SR20DET. ACT catalogs it for the 1991-1998 Japanese-market Nissan Silvia K's with the 2.0L turbo four, which covers S13 and S14 chassis cars and the many 240SX owners who have swapped in an SR20DET and its five-speed. At 10.6 lb it is ACT's lightest flywheel style, built for drivers chasing faster revs on a road course, autocross or drift car, or replacing a cracked or heat-checked factory flywheel during a clutch job.
The flywheel is the friction face the clutch disc clamps against and the carrier for the starter ring gear. Taking mass off it lowers rotating inertia, so the engine gains and drops revs faster between shifts. ACT forges the 600230 from chromoly steel as one piece, CNC machines it and dynamically balances it, then induction-hardens the ring gear. There are no bolted-in friction inserts to warp or ring gear to come loose, and the one-piece body carries heat away from the disc evenly.
ACT is upfront about the tradeoff: Prolite flywheels are recommended for race use and have reduced drivability. Expect sharper throttle response with mild to moderate gear rattle at idle and less forgiveness pulling away from a stop. If the car is mostly a street driver, ACT's heavier Streetlite style is the friendlier choice.
With the transmission out, inspect the flywheel face for hot spots and cracks, check it for flatness and run-out, and look over every ring gear tooth. Slip and chatter can also come from oil on the disc or a hydraulic fault, so check the rear main seal and the release system first. Our slipping diagnosis guide covers the road test, and shift flare vs slip helps confirm it is a real slip.
ACT lists 600230 for the 1991-1998 Nissan Silvia K's 2.0L turbo (SR20DET). It is not cataloged for any US-market 240SX, which came with the KA24 and needs a different flywheel. On a swapped 240SX it fits when the engine and transmission are an SR20DET pairing, but swaps vary, so confirm your engine code and gearbox before ordering or send us the details. Key specs from ACT: 10.6 lb, 240 mm (9.4 in) friction surface, 108-tooth ring gear, SFI 1.1 certified. Use a clutch built to the factory SR20DET dimensions, such as our SR20DET FX400 clutch kit or the Silvia Stage 2 clutch kit, and confirm the step matches.
Budgeting the job? Our manual transmission repair cost guide covers typical labor.
| Brand | ACT |
| Part number | 600230 |
| Fits | ACT XACT Flywheel Prolite |
| Type | Flywheels |
| Condition | New |
| Ships | Same business day (in stock), from the USA |
| Warranty | 1-year |
ACT catalogs it for the 1991-1998 Nissan Silvia K's 2.0L SR20DET. It also suits 240SX cars swapped to an SR20DET engine and transmission, but it is not listed for the US KA24 240SX.
ACT lists the 600230 at 10.6 lb, with a 240 mm friction surface and a 108-tooth ring gear.
ACT recommends Prolite flywheels for race use and notes reduced drivability with mild to moderate gear rattle. Street-driven cars are usually happier with the heavier Streetlite style.
Yes, as long as the clutch is built to factory SR20DET dimensions and the flywheel step matches. ACT notes that clutches designated as conversion kits must use their matching flywheel.
Yes. ACT says XACT flywheels resurface like stock ones; remove no more than 0.040 in. of material and keep the proper step.
Yes, ACT lists the 600230 as SFI 1.1 certified.
