09-19-2009, 09:48 AM
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#1
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2001 RUF 3800S
Join Date: Mar 2009
Location: Ontario, Canada
Posts: 326
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Does anyone have a sprung clutch with a LWFW installed?
Im in need of a new clutch and Im planning to upgrade to a stage 2 sprung clutch most likely from Spec. And also im looking for a LWFL. Does anyone have a similar set up? If so can I get your reviews? what kind, how does it feel? etc..
Thank you.
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09-19-2009, 10:10 AM
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#2
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Registered User
Join Date: Mar 2008
Location: CA
Posts: 726
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if you search you will find other threads on clutches and LWFWs. I recall reading several of them and the general consensus was that a LWFW was a bad idea on our cars.
there were a handful of people who had them and really like the increased responsiveness, but Jake and others who are "in the know" have said you are basicallyh playing russian roulette with your motor if you put one on...
search for flywheel, clutch, etc.
I'd be interested to hear what you do...my car has 75k miles, stock clutch, and I'm sure i'll be doing one at some point... if there ends up being a SAFE way to do a LWFW, I'm all in.
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Cars:
2007 MDX - Wife's mommy mobile
2006 RL - My daily driver
2000 Boxster - Ocean Blue Base 5spd on Black Full leather. 18" wheels and M030.
Boxster mods I've added: Rear speaker kit, Painted Calipers, Painted Bumperettes, Painted Center Console, 987 Shifter Assembly, 3 Spoke Steering Wheel, Clear side markers, 03+ rear lights, de-snorkeled.
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09-19-2009, 10:28 AM
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#3
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2001 RUF 3800S
Join Date: Mar 2009
Location: Ontario, Canada
Posts: 326
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Ive been doing research non stop on this topic. And from what Ive read it seems that you can do a LWFW as long as you have a sprung clutch. Many people have been complaining about vibrations and noise and all of them didnt have a sprung clutch. So Im hoping someone here has this set up and can report back.....
Last edited by violametallic-S-; 09-19-2009 at 10:37 AM.
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09-19-2009, 11:41 AM
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#4
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Registered User
Join Date: Jan 2007
Location: Depends on the day of the week....
Posts: 1,400
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The throttle response from losing that much rotating mass off the motor is great, however, to avoid chatter and vibration and for the benefit/ safety of the driveline, you want a sprung clutch.
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Boxster S
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09-19-2009, 02:32 PM
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#5
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Registered User
Join Date: Mar 2009
Location: DFW, TX
Posts: 206
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I am thinking along similar lines, but does the spec line have a version for our cars that is s sprung clutch?
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rob76turbo
Current Porsches: 2002 Boxster S (Speed yellow)
Past Porsches: 1972 914, 1987 944S, 1976 930, 1986 951, 1999 986, 1992 968, 2001 986 S, 2006 Cayman S, 1986 951 track car, 2001 986 S, 2005 Cayenne
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09-19-2009, 04:03 PM
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#6
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2001 RUF 3800S
Join Date: Mar 2009
Location: Ontario, Canada
Posts: 326
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Should I be looking for a single mass LWFW or a dual mass? What is the difference?
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09-19-2009, 05:35 PM
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#7
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Registered User
Join Date: Jan 2007
Location: Depends on the day of the week....
Posts: 1,400
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You won't find a lightweight dual mass. Single mass is just that: one piece of metal. A dual mass has two pieces that are held together with elastomeric material to allow some "give" to dampen driveline forces.
Spec does make a sprung clutch (they'll make pretty much whatever you want actually), and if you do go to a single mass flywheel, a sprung centered clutch is the only acceptable way to do it.
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Boxster S
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09-20-2009, 09:37 AM
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#8
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Registered User
Join Date: Feb 2005
Location: It's a kind of magic.....
Posts: 6,277
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You are missing one very important point: The dual mass flywheel acts as a vibration dampener for the engine; the sprung clutch acts as a dampener for the drive line………..taking away the dual mass dampening can result in problems as the largest vibration dampener on the engine is now missing.
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09-20-2009, 10:13 AM
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#9
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Registered User
Join Date: Jan 2007
Location: Depends on the day of the week....
Posts: 1,400
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That is absolutely true. In my ideal world, I'd like a lightwight dual mass unit, but alas, I've never seen one produced for any application.
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Boxster S
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09-21-2009, 06:28 AM
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#10
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Registered User
Join Date: Feb 2005
Location: It's a kind of magic.....
Posts: 6,277
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Quote:
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Originally Posted by bmwm750
That is absolutely true. In my ideal world, I'd like a lightwight dual mass unit, but alas, I've never seen one produced for any application.
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Which is why I totally agree with Jake on this one, and wouldn’t run one without internally balancing the M96 first………….these engines have enough issues without increasing their internal harmonics.
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09-21-2009, 11:27 AM
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#11
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Engine Surgeon
Join Date: Aug 2008
Location: Cleveland GA USA
Posts: 2,425
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I have recently experienced a broken crankshaft from an engine equipped with an LWFW that was dynamically balanced as an assembly with the engine totally disassembled. (I did not assemble it)
But that person has broken 4 crankshafts since last October.
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09-21-2009, 12:53 PM
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#12
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Registered User
Join Date: Jul 2006
Location: Virginia
Posts: 916
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"But that person has broken 4 crankshafts since last October"
We have a wild person running loose.....
Ed
:dance:
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09-21-2009, 01:23 PM
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#13
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Registered User
Join Date: Sep 2005
Location: Sacramento
Posts: 3,417
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What in the world can you do to break 4 crankshafts in a row?
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09-21-2009, 02:05 PM
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#14
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Registered User
Join Date: Feb 2005
Location: It's a kind of magic.....
Posts: 6,277
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Shaking the loving crap out of the internals will do it all by itself............. That is why I just love it when the “complex carbohydrate adolescents” pull the balance shafts out of their high winding four cylinders to gain 4 HP…….
Last edited by JFP in PA; 09-21-2009 at 02:56 PM.
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09-25-2009, 06:13 PM
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#15
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Registered User
Join Date: Dec 2006
Location: Santa Barbara, CA
Posts: 308
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My limited understand from reading about dual mass flywheel is that it's function is to smooth out the power spikes from the engine to limit jack hammering the transmision and the drivetrain and to prevent power spike reflection from damaging the engine.
based on the torque of the engine and masses of the dual flywheel, I'm guessing that the effective rpm range for dual mass is during clutch engagement and that at higher rpm, the spring coupler is not changing.
my naive thinking is that at some rpm and higher, dual mass flywheel is no longer "dual mass" and becomes one mass.
am I all wet?
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