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Old 10-19-2000, 08:43 AM   #1
wop
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Member#: 1931
Join Date: Jul 2000
Location: orange, ca
Vehicle:
2000 00 impreza 2.2l
wagon

Question fly wheels and clutches

I have a '99 RS and wanted to get a lighter fly wheel and stronger clutch.

Anybody have any feed back on this?

Thanks in advance.

wop
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Old 10-19-2000, 08:47 AM   #2
Imprezer
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Chapter/Region: BAIC
Location: Alameda, CA
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2011 Impreza WRX STi
Black

Post

While clutch+lightened flywheel is not a "horsepower" adding mod, I truely beleive that for an NA Impreza, it give the best "hp" for the buck. The car becomes so much more drivable. I am sure that having 8 lbs shaved of the stock FW will get some hp lost due to the weight of the stock FW.

I have ACT Clutch + Primitive Flywheel.
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Old 10-19-2000, 08:56 AM   #3
wop
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Imprezer-

I thought that a lighter flywheel would add a few horse power ? Sorry if I am in the wrong forum. Where and how much was your set up? What is your set up (ex. which ACT)? Did you do the install your self? I heard the clutch is next to impossible.

Thanks,

-wop
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Old 10-19-2000, 09:10 AM   #4
Impreza Rider
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It won't add any power to the engine, what it will do os allow more hp to be transferred to the wheels. It makes the driveline lighter, and takes less energy to get it moving. Make sense?

Jim
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Old 10-19-2000, 09:15 AM   #5
wop
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got it. Impreza Rider, do you have this set up?

-wop
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Old 10-19-2000, 11:37 AM   #6
Impreza Rider
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Not yet, I don't have the $$$ right now. In the future I'll probably go with a clutch and flywheel after I have the engine putting out more power...

Jim
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Old 10-19-2000, 03:55 PM   #7
TMR Impreza
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Vehicle:
2011 M3 and 328i
white and black

Talking

ISR flywheel and clutch is an awsome combo. Call pam and ask her about it.
www.autocaresubaru.com
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Old 10-19-2000, 04:08 PM   #8
Matt Monson
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Location: Teh Ghetto Garage, CO
Vehicle:
99 2.5RS, '85 911
'73 914 and 2012 BRZ

Question

I used to have an ACT clutch and pressure plate with a lightened stock flywheel on my civic and it did make a difference. The way that I look at it is the engine makes 165hp, but when Shiv dyno's it he gets 95 wheel hp. Lightening the flywheel will reduce these losses by reducing the rotational weight. Not real HP, but it is usable power.
Could anyone tell me what the real advantage would be to an ISR or Primitive flywheel vs. just lightening the stock one?
Oh,almost forgot, don't try this at home, it is a pain in the a%$ to pull and reinstall an AWD tranny!

[This message has been edited by Matt Monson (edited October 19, 2000).]

[This message has been edited by Matt Monson (edited October 19, 2000).]
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Old 10-19-2000, 04:19 PM   #9
Andre Vandenberg
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I agree about the R&R tranny bit... Took me a FULL weekend to do + LOTS of skin and cuss words
Take to Donny at Irvine Subaru, I watched him take one out in 20 Min!!! While shooting the breeze with me. Helps to have the right tools AND the experiance!
I have ACT clutch and pressure plate stock flywheel.
Andre
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Old 10-19-2000, 08:07 PM   #10
Impreza Rider
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Matt-

Lightening the stock one could end up disaterous. If you do lighten it, I think that you're supposed to get it hardened afterwards. I heard that it can cause hairline factures that can result in the flywheel shattering under extreame pressure. Anyone feel free to correct me...

Jim
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Old 10-19-2000, 10:28 PM   #11
george
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Blue Ridge Pearl

Thumbs up

I've heard of that too, ImprezaRider.

That's why I'm waiting to buy a lightened and balanced flywheel (once I have to replace my clutch).
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Old 10-20-2000, 12:27 AM   #12
Omensan
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I have a first-flight '98 DOHC 2.5RS, with the well known problem of From-the-Factory-Clutch-Shudder-From-Hades.

After the usual run around with the dealer, i ended up buying the subaru-replacement flywheel (the old 98 flywheel has of course been superceeded with a new part), and had a specialty shop (NOT your average run of the mill machine shop) cut the replacement from 22.1 lbs to 15.6 lbs. There is a grunch of excess metal on the backside surface, and it left a large margin of safety after machining and balancing. Throttle response is only SLIGHTLY improved, and shifting was noticably improved (suspect faster flywheel spin-down during shift into next gear...)

Without the turbo, it's really not (IMHO!) worth the effort. The 2.5 has the low-end to deal with a slightly heavy flywheel, and there is a definate degredation of idle-smoothness (gee, imagine that.) There are aluminium f/w's under 10 lbs, *I* can't even begin to see that as a streetable, everyday-driver f/w. It would be unreasonable to be doing 4k clutch drops from every stop sign, just to keep the motor going. I'm sure for RACING/RALLY, it's a great idea.

My final pressure plate ended up being a custom-created 1850 lb. dual-diaphram (using subaru original carrier), with a 9-pad copper/ceramic disc (not a puck, guys. a disc :-)).

I had a TERRIBLE experience with the Unorthodox kevlar clutch/pressure plate... the p/p and (original at the time) flywheel were properly machined, and bed-in procedures were strictly followed. It's too bad that the p/p was only 1125 lbs (STOCK was 1280) and the clutch wouldn't lock up under the power of an UNmodified motor (much less the turbo). After 10k miles of "oh, it's just bedding in", i took it out, to discover that the disc carrier had cracked in 4 places, and the p/p and f/w were HORRIBLY heat-scarred.

The copper/ceramic pad clutch locks up first time, every time, under the most horrible launches. Even under extreme heat - multiple, rapid launches for ex, - the disc still locks hard. I have the quaife (torsen-style) rear differential, and I have NO problems getting the wheels to unlock on pavement from a launch (don't try this at home kids, I'm GENTLE on it, really.)

Anyway, the whole combo still shudders, but no worse than the stock setup, and will take double the torque from the motor :-)

-JCS
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