ACT 2010 Hyundai Genesis Coupe XACT Flywheel Streetlite
The ACT 600665 XACT Streetlite is a one-piece chromoly flywheel for the 2010 Hyundai Genesis Coupe 2.0T with the six-speed manual. Turbo four-cylinder owners usually land here for one of three reasons: the clutch is coming out after a tune and the old flywheel is heat-checked or too thin to machine again, the car shudders or judders pulling away, or they want the engine to drop and pick up revs faster between shifts. This is the 2.0T part. The 3.8 V6 car uses a different flywheel.
On a manual car the flywheel bolts to the crankshaft, carries the starter ring gear and gives the clutch disc the surface it clamps against. ACT forges the 600665 from chromoly steel, then CNC machines and dynamically balances it. ACT lists it at 18.8 lb with a 9.4 in (240 mm) friction surface and a 135-tooth induction-hardened ring gear, and certifies it to SFI 1.1. Because the ring gear and friction face are part of one forging, there are no inserts to warp and no ring gear to spin loose under hard launches.
ACT calls the Streetlite its most durable flywheel line and describes it as considerably lighter than stock. With less mass to spin up, the Theta II turbo engine climbs through the rev range more freely and rev-matching on downshifts gets easier. ACT rates the feel as OE to mild gear rattle, so expect a little more noise from the gearbox at idle in neutral than a new stock car makes. ACT also includes its PB1007 pilot bearing with this flywheel.
Separate slip from noise first. For slip, use a third or fourth gear pull from low rpm and watch whether the tach rises faster than road speed; our slipping diagnosis guide covers the test, and flare vs. slip helps if you are not sure what the car is doing. For noise, listen at idle in neutral and press the pedal: a sound that changes with the pedal sits in the clutch, release bearing or flywheel area. Final confirmation happens with the gearbox out. Measure the face, look for heat cracks running toward the bolt holes, and check the ring gear for missing or chewed teeth.
Our listing is for the 2010 Hyundai Genesis Coupe 2.0T. ACT's own chart for 600665 runs from 2010 through 2012 on the 2.0T in base, GT, Premium, R-Spec and Track trims, all manual. It does not fit the 3.8 V6 car, which takes the ACT 600725 Streetlite with a larger 250 mm face, and it is not listed for the 2013 and later refreshed cars, which use different clutch parts such as the HY5-HDSS kit. Automatic 2.0T cars use a flexplate and are not a match. If your engine or transmission has been swapped, send us the year and VIN before ordering.
| Brand | ACT |
| Part number | 600665 |
| Fits | ACT 2010 Hyundai Genesis Coupe XACT Flywheel Streetlite |
| Vehicle fitment | Hyundai Genesis Coupe Xact (2010) |
| Type | Flywheels |
| Condition | New |
| Ships | Same business day (in stock), from the USA |
| Warranty | 1-year |
No. The 600665 is listed only for the 2.0T four-cylinder cars. The 3.8 V6 uses ACT 600725, which has a 250 mm friction surface and a 125-tooth ring gear.
ACT lists 2010, 2011 and 2012 2.0T cars with the manual transmission on its application chart for 600665. Our listing is titled for 2010; send us your VIN if you want us to double-check a 2011 or 2012 car.
ACT lists it at 18.8 lb. It is one-piece chromoly steel with a 240 mm friction surface and a 135-tooth ring gear.
Yes. ACT includes the PB1007 pilot bearing with this flywheel. You will still need a puller to remove the old bearing from the crankshaft.
ACT rates the feel as OE to mild gear rattle. Some owners hear light chatter from the gearbox at idle in neutral that goes away when the clutch pedal is pressed.
Yes. ACT says XACT flywheels can be machined like a stock flywheel, removing no more than 0.040 in of material and keeping the correct step height.
