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Old 08-12-2003, 11:06 PM   #1
AzNStiImpreza
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Default Lightened Flywheel + Lightwieght pulley = problem?!?

Hello all. I own a 2000 subaru impreza 2.5rs and was thinking about purchasing a lightened flywheel for my car. i thought Fidanaza was a good idea becuz it weighs about 9lbs and is the cheapest i can find. One mod I already have on my car is Unorthodox racing pulleys. I've read somethings on NASIOC and RS25 that lightened flywheels and pulleys dont go well because of idling, bogging, and stalling issues etc. etc.

I would like more information on this.

Maybe i can still get a lightened flywheel if i get a "heavier" one like the 14 lbs exedy flywheel?

please help.
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Old 08-12-2003, 11:39 PM   #2
Pat L.I.
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i am currently running gfb pulleys (alternator / crank) and an exedy lw flywheel with exedy sport clutch on my 02 rs. i have no problems. Yes the car is slightly different to drive, more noticeable when the ac is on the revs will drop quicker. but not as bad as i had imagined from reading around the site. basically i just cant be really lazy with shifts, other than that it is fine. took me a few starts to get totally used to it but i love it. definately worth the increased acceleration. im not sure how a 9 lb flywheel will change things though.
good luck
Pat
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Old 08-13-2003, 03:51 AM   #3
scotty305
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I've got an Exedy 13lb flywheel, Unorthodox underdrive pulley, not problems.

-s-
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Old 08-13-2003, 09:15 AM   #4
goobie
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Default 3rd Confirmation

I also have a LW flywheel (15lbs) and the Unorthodox LW UD pulley. No problems.

Chad
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Old 08-13-2003, 09:23 AM   #5
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It may cause you to have unsteady idle and possibly stalling if the unsteadyness is drastic enough. Ours idles as if it's lobing over with a big fat cam, but it's just the lowered inertia showing itself. We plan to raise the idle by about 50-100RPM to see if that smooths things out. YMMV.

Don't believe the hype! I wouldn't trade our Fidanza or pulleys for ANYTHING!

Jay Storm
www.sourcemotorsports.com
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Old 08-13-2003, 12:29 PM   #6
jsavage
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Default Anyone have dimensions on these fly wheels?

I want to lathe my own flywheels...anyone got the dimensions or know where to get em?
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Old 08-13-2003, 02:03 PM   #7
scotty305
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um, jsavage, I wouldn't recommend this. Most aftermarket flywheels have holes around the outside edge, to reduce inertia while retaining strength. Find a picture of the Exedy flywheels, you'll see.

But if you were to remove a few mm's in the wrong place....


Well, let me put it this way; have you ever seen a flywheel explode? I haven't , but I've heard stories, and that's plenty for me. The stories made comparison to a hand grenade going off near the drivers' legs.

-s-
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Old 08-13-2003, 11:44 PM   #8
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A pic of my Exedy 12.9lbs flywheel.

I had this baby install while retaining the stock clutch (60K miles) and it still feels stock. It does rev faster, easier to rev match, accelerates quicker, but it feels stock when idling and when crawling at 10mph. I should've gone lighter. So I guess I'll try lightweight pullies or something.

BTW...there is a pic of an exploded flywheel, floating around OT. I'm too lazy to do a search but it has something to do with some transmission tuner.
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Old 08-14-2003, 12:01 AM   #9
AzNStiImpreza
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i got some lopey @$$ cams so my car already idles low, with the pulleys also. so im still thinkin about getting the flywheel or not.
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Old 08-15-2003, 12:03 PM   #10
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Lots of good info in this thread I started
http://forums.nasioc.com/forums/show...ht=lightweight
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Old 08-16-2003, 02:59 AM   #11
BAN SUVS
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With a really light flywheel, it's pretty hard to tell the difference between a 1 pound pulley and the stock 5 pound pulley. It's worth keeping the dampening of the stock pulley if you are getting a lightened flywheel. If you can't or aren't getting a flywheel, a lightened non-underdrive pulley is probably fine. Mike Shields gives some other good reasons in this article.
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