Most stock flywheels are heavy cast iron parts designed for optimum street driveability by soaking up some of the power from the engine and putting it in storage in the form of inertia. Although this may be important for transporting the groceries, this driveability comes at the expense of engine response and acceleration. Light weight flywheels keep less inertia in storage but the lighter rotating mass provides significantly improved engine response and acceleration characteristics. Until now most aftermarket flywheels for sport compact vehicles presented certain undesirable concessions to the user. Many are too light or fragile for the application, others have reliability issues and all are very expensive.
Finally, ACT offers exactly what performance enthusiasts need: all the benefits of a premium quality light weight flywheel at an affordable price.
ACT currently manufactures XACT flywheels in two versions, ProLite for road racing
applications and very quick throttle response, and slightly heavier StreetLite for street and drag racing vehicles which may require more inertia. For example, the Integra ProLite weighs 8.8lbs and the Integra StreetLite weighs 12.5lbs. Both ProLite and StreetLite flywheels are precision made from Chrome-moly forgings and feature an induction hardened integral ring gear. All ProLite and StreetLite flywheels are CNC machined, heat treated for strength and precision balanced. Substantial material is left behind the clutch surface area for better heat dissipation and durability while weight savings is made where it matters the most for reduced inertia.
XACT flywheels are certified by ACT to meet SFI Spec. 1.1. This makes XACT Flywheels legal for competition when SFI Spec. 1.1 is required or recommended. XACT flywheels come complete with official SFI sticker and serial number as required for certification.
Notes
All rotary engines (including RX7, RX8, etc.) require additional parts (counterweights) for proper function.
This flywheel was kind of an experiment for me, as in the past I have always bought lightweight aluminum flywheels in the 7-9lb range. This particular item is a 12.8lb steel unit, and while it IS more responsive that the factory unit (~17-18lbs according to my scale), it doesn't offer quite the throttle response or acceleration increases I've noted from previous light flywheels. That being said, it IS a well finished product, and fits great, but next time I will be getting a lighter unit.
10
06/30/2010
Eclipse
great flywheel bolts up like oem and was lighter than the stock flywheel
10
10/30/2009
RSX
good product ;)
9
06/09/2008
Eclipse
Made a lot of difference, love the way the car drives now! Would have given a 10 but ACT mailed me the wrong flywheel and I had to pay an extra 125 on installation :< becuase they had to take the tranny apart twice.
10
06/24/2007
Impreza
Seem like a fine upgrade I was expecting some big difference but I think the stock clutch and flywheel were so heavy and week and now it just feels right
10
05/03/2007
Civic
great flywheel. saw big increase in rev. limit.
10
02/19/2007
Impreza
9
10/09/2006
RX-7
Well built product, happy to see it is cerified SFI.
Would be nice if they provided SFI certificate and put torque specs for bolts though. Did exactly what I wanted it to do, rev a little bit faster without serious daily driving problems.
Zoom 
(9.4 of 10)