Stock vs Lightweight Flywheel
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2004-2007 Cadillac CTS-V Performance Mods Discussion, Stock vs Lightweight Flywheel in Cadillac CTS-V Series Forum - 2004 - 2007; I have been having some vibration issues on my 2005 CTS-V and last night I took the transmission out of ...
  1. #1
    wross3030's Avatar
    wross3030 is offline Cadillac Owners Member
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    Stock vs Lightweight Flywheel

    I have been having some vibration issues on my 2005 CTS-V and last night I took the transmission out of the car. I discovered that the dual mass flywheel is starting to come apart. I want to replace it but I am not sure which direction to go or what all of my options are, here is what I can currently get my hands on:

    1. Stock replacement from GM dealer - $900
    2. Lightweight replacement made from UUC - $425

    I am concerned about losing tourque going with the lightweight replacement and I am concerened about the stock repalcement because I broke the original in 40,000 miles.

    Any suggestions?

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  3. #2
    ctsv154's Avatar
    ctsv154 is offline Cadillac Owners Connoisseur
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    Re: Stock vs Lightweight Flywheel

    You probably won't find a UUC but go light non the less. It will take a little getting used to a lighter setup but you enjoy it much more. I say stick an LS7 setup in there if you're fairly stock.

  4. #3
    PISNUOFF Guest

    Re: Stock vs Lightweight Flywheel

    Go with the complete LS7 setup. The flywheel is a ton lighter but not too light.

  5. #4
    branland's Avatar
    branland is offline Cadillac Owners Fanatic
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    Re: Stock vs Lightweight Flywheel

    Quote Originally Posted by PISNUOFF View Post
    Go with the complete LS7 setup. The flywheel is a ton lighter but not too light.
    I love my LS7 setup.

  6. #5
    fazz1225 is offline Cadillac Owners Member
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    Re: Stock vs Lightweight Flywheel

    LS7 keeps stock feel with better RPM increase and decrease..... LS7 FTW

  7. #6
    whisler151's Avatar
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    Re: Stock vs Lightweight Flywheel

    You will love the light flywheel.

  8. #7
    CancerJCC is offline Cadillac Owners Connoisseur
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    Re: Stock vs Lightweight Flywheel

    Why you would want to stay stock is anybodies guess but if you do complete setups can be had on ebay brand new for $500ish.

  9. #8
    rand49er's Avatar
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    Re: Stock vs Lightweight Flywheel

    I got a stock FW sitting on the garage floor. Good place for it, too. You don't want to go back to a stock FW.

    Regarding driveability, I have no difficulty whatsoever driving a lightweight FW. You won't either.
    '05 CTS-V, Maggie, Kooks, Hotchkis, Ground Control, Corsa, B&M, DSS/Hendrix, Full 3M Clear Bra, Autovation, V Headrests, CTS Console, STS-V 55w Fogs, Black Vette FRCs, Specter Werkes, Katech LS9 Clutch, SS Brake Lines, Heavymetals U-Turn Fuel Line Eliminator, Momo Combat Evo Shift Knob, Wldwhl Clear Sidemarkers, Linea Corse LC855 Wheels or OEM wheels w/'06-'07 Center Caps, plus a couple more. 472 RWHP/411 RWTQ (Mustang Dyno).

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    Re: Stock vs Lightweight Flywheel

    LS7 kit from Lindsey and call it a day.

  11. #10
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    Re: Stock vs Lightweight Flywheel

    Sounds like the LS7 setup is the way to go. Can I use the clutch I have with the LS7 FW or do I need an LS7 clutch to match?

  12. #11
    Doctechx is offline Cadillac Owners Member
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    Re: Stock vs Lightweight Flywheel

    Quote Originally Posted by wross3030 View Post
    Sounds like the LS7 setup is the way to go. Can I use the clutch I have with the LS7 FW or do I need an LS7 clutch to match?
    The difference in cost for the whole LS7 set-up vs just the FW is negligible. Not to mention the minor difference in effort / labor to swap the FW vs. the whole clutch. Considering that you already have the whole clutch pulled out, you might as well replace the whole thing. I have been trying to make this decision myself, but will probably wait until my clutch goes completely or can't hold the torque. I am considering the LS7 from Lindsay, or the stage 2 from Monster. I have heard that you want to stick to a full face (avoid puck style - stage 3 and above) unless your car definitely exceeds the torque capacity of the stage 2 unit. I have been struggling with the decision to go light weight as well. Just remember, even the 28lb Monster FW and stock LS7 are still considerably lighter than the OEM dual mass turd. Some think the light weight 15 lb Monster FW is too light. Others absolutely love them. I think it probably just takes some time to get used to the change in engagement.

  13. #12
    CadzillaTN's Avatar
    CadzillaTN is offline Cadillac Owners Connoisseur
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    Perhaps I'm in the minority here but I picked up a new stock clutch for only a couple hundred bucks...i know its a turd but it was a good deal.. I'm still under warranty too so this is also cheap insurance in case of sudden failure. With all the stories of various clutches not working out, I didn't want to be under the gun..

    I assume I can merry up a lighter flywheel with this setup and throw it in there if I have to..or just pass this one on to someone else.

    I also don't know if I can give up my 2nd gear starts! Maybe when V isn't my dd anymore..

    Ps_ any tips on how I can burn up my existing clutch on purpose? With all the wheel hop is it even possible?

  14. #13
    814V's Avatar
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    Re: Stock vs Lightweight Flywheel

    What does the LS7 kit cost from Lindsey?

  15. #14
    heavymetals's Avatar
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    Re: Stock vs Lightweight Flywheel

    "Ps_ any tips on how I can burn up my existing clutch on purpose? With all the wheel hop is it even possible?"

    Park going up hill. The steeper the better.

    My favorite is to get up to 75 and then push in the clutch, let the rpms drop then slowly re engage.

    Smells great!

  16. #15
    CancerJCC is offline Cadillac Owners Connoisseur
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    Re: Stock vs Lightweight Flywheel

    Quote Originally Posted by CadzillaTN View Post

    Ps_ any tips on how I can burn up my existing clutch on purpose? With all the wheel hop is it even possible?
    Clutch is a wear item and is not covered under warranty so I would think twice.

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