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Old 04-04-2006, 06:02 PM   #1
Axan
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2011 Impreza WRX STI
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Default act streetlite or prolite flywheel for STi?

I own an 05 STI im about to upgrade my clutch (going with rps max) and i figured ill do a flywheel at the same time. Now I can't decide whether i want act streetlite(~15lb) or prolite (~11lb) flywheel. My car is a daily driver, it sees a lot of autox and about 4-6 track days a year. Any recommendations? I would love to hear from owners of either flywheel.
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Old 04-04-2006, 06:37 PM   #2
WRX_Mundi
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I just put an ACT HDSS clutch + pressure plate and ACT ProLite flywheel in my 2004 STi to replace the stock units. My impression is that this combination is very streetable as well as good for autocross (I did about 20 runs this weekend). I have a Perrin crankshaft pulley as well, and I am having no issues like CELs. My idle is just as smooth as before. When the car is really cold, it exagerates the jerks under constant throttle at very low speeds, but that seems to be gone when the car warms up (and has no effect anyway unless you're driving at 5mph in 1st). No problems at all starting from a stop, slowly reversing, driving the car up onto a trailer, etc. It really isn't much different than stock other than the clutch pedal has more force. With clutch in there is no question it revs much easier.

It took me a few launches to get used to it at the autocross test and tune, where I slipped a bit too much, or it bogged. But every one of my 8 launches in actual competition were good, with good bite and just a bit of wheel spin. So no problems there, and I'd expect some getting used to a new clutch and flywheel.

There is increased drivetrain noise, which I hear mostly on the highway when at constant cruise. A bit more throttle or a bit less and it goes away. I can also hear more when driving in first gear to the line. But my car is pretty noisy and I have put in aftermarket bushings and mounts all over (rear diff bushings, rear diff outrigger, control arm, camber plates, engine mounts, tranny mount, shifter, etc.). Since I did all the rear diff bushings at the same time I suppose some of it could be those.

I have heard a few people indicate that the ACT clutch unit is a bit heavier than some others so if you get a very lightweight pressure plate it may show more effect. But I can't vouch for that.

I'm glad I did the ProLite, as it doesn't seem at all excessively light. I was certainly expecting a lot more negatives after everyone's comments about super light flywheels, but I haven't seen much. I do have their street clutch (full disk organic) which probably helps -- a 3-puck race disk might be a different story entirely. I don't think 11lbs 15oz is all that light anyway -- it's a huge chunk of metal.

The other options I considered were the Exedy Hyper twin-plate and the Tilton twin-disk hybrid. They're quite a bit more money and I don't think I need what they're offering. The Tilton sure looks sweet though.
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Old 04-04-2006, 06:38 PM   #3
swift2fly
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i have the streetlite flywheel. they say that the car stalls out a lot with the prolite, i'm not sure though, maybe a current user can chime in. also, a lot of people who go lighter, like myself, have noticed louder deceleration noise.
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Old 04-04-2006, 06:47 PM   #4
WRX_Mundi
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Clarifying my message, I have the ProLite and haven't stalled the car a single time (I'm not the most coordinated person either). I bogged my hard launches the first few times, but that seems to just have required some calibration from the driver. On the street I don't have to give it excessive revs and it's fine in stop-and-go stoplight traffic. But I have the ACT HD street disk clutch which may make a difference. Gruppe-S has the set for $895 including shipping (you can choose the StreetLite too of course).
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Old 04-05-2006, 02:19 AM   #5
Axan
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wrx_mundi thanx a lot for your input thats exactly the kind of feedback i was looking for, I'm really leaning towards the prolite now.

Last edited by Axan; 04-05-2006 at 02:48 AM.
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