dual mass flywheel
Melting Slicks
Joined: Dec 2004
Posts: 2,943
Likes: 14
From: Gurley (Keel Mtn, Sweet Home) Alabama
ain't none
well, at least what I have found out/searched for/heard about.
apparently the mfg'er stopped producing them and no other company has stepped in to produce.
but, let us all know what you find out in today's world as you search
well, at least what I have found out/searched for/heard about.
apparently the mfg'er stopped producing them and no other company has stepped in to produce.
but, let us all know what you find out in today's world as you search
Instructor
Joined: Oct 2010
Posts: 100
Likes: 0
My local Corvette Shop talked me into going with a single mass flywheel. To get it quiet again, I'm going to have to try a Tremec.
In first or second, the ZF sounds like it's gonna fall out of the car.
In neutral, the tranny is louder than the exaust and I have straight through mufflers.
In first or second, the ZF sounds like it's gonna fall out of the car.
In neutral, the tranny is louder than the exaust and I have straight through mufflers.
Race Director
Joined: Nov 2003
Posts: 12,221
Likes: 446
From: Overland Park Kansas
2020 Corvette of the Year Finalist (appearance mods)
C4 of Year Winner (appearance mods) 2019
I believe Bill @ ZFDoc has a fix for that but requires the unit to do the procedure. No idea how expensive. The procedure has something to do with bearing tolerance....I think.
I will say blue-printed units from Bill are reported to be (even more) bulletproof than the already sturdy ZF6.
To the OP:
I noticed PowerTorqueSystems has resurfaced DMFs on their website -- though I've yet to read of anyone here using one. No idea if there's really any availability either.
From time-to-time, I have seen one/two resurfaced units posted around.
I will say blue-printed units from Bill are reported to be (even more) bulletproof than the already sturdy ZF6.
To the OP:
I noticed PowerTorqueSystems has resurfaced DMFs on their website -- though I've yet to read of anyone here using one. No idea if there's really any availability either.
From time-to-time, I have seen one/two resurfaced units posted around.
Instructor
Joined: Oct 2010
Posts: 100
Likes: 0
Burning Brakes
Joined: Aug 2010
Posts: 951
Likes: 3
From: Placerville CA
Hmmm...being more of a motorcycle guy I had never heard of a dual-mass flywheel, and had to look it up. It seems strange that GM engineers went to this Rube Goldbergian contraption instead of an electronic limiter on the engine's torque output to keep stress on driveline components within limits. I can't imagine that an algorithm involving torque/rpm/traction would be too difficult for the CPU to handle.
Of course I'm not hampered by a knowledge of the subject. Which means my qualifications as an instant interwebs expert are perfectly in order.
Of course I'm not hampered by a knowledge of the subject. Which means my qualifications as an instant interwebs expert are perfectly in order.
Le Mans Master
Joined: May 2005
Posts: 7,373
Likes: 2,288
From: Central Maryland
Hmmm...being more of a motorcycle guy I had never heard of a dual-mass flywheel, and had to look it up. It seems strange that GM engineers went to this Rube Goldbergian contraption instead of an electronic limiter on the engine's torque output to keep stress on driveline components within limits. I can't imagine that an algorithm involving torque/rpm/traction would be too difficult for the CPU to handle.
Of course I'm not hampered by a knowledge of the subject. Which means my qualifications as an instant interwebs expert are perfectly in order.
Of course I'm not hampered by a knowledge of the subject. Which means my qualifications as an instant interwebs expert are perfectly in order.
FWIW, I installed an extra-mass billet steel flywheel from Spec, along with a Spec stage 2 sprung-hub clutch kit in my '94, and have only minimal gear rattle. I can only hear it when the windows and ragtop are up, and nobody else has even noticed or commented on it. In this car, it's only barely audible over the Corsa exhaust. The fact that the blue-tag ZF in my car, with its slightly steeper helical angles, is somewhat less prone to this problem probably helped a bit in my case. Different gear oils might also affect the results.
Live well,
SJW
Last edited by SJW; Sep 29, 2012 at 11:43 AM.
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Instructor
Joined: Oct 2010
Posts: 100
Likes: 0
Several of the German Luxury cars were equipped with Dual Mass Flywheels.. Mercedes-Benz, BMW, Porsche, and Audi.
I spent $2000 for a single mass including preasure plate and install and I am dissapointed with the rattle.
ebay has a new GM DM for $700.
I wish I had gone that route.
http://www.ebay.com/itm/90-91-92-93-...f936a2&vxp=mtr
Its hard to imagine that GM picked a tranny that required a "fix" before it could be used.
I spent $2000 for a single mass including preasure plate and install and I am dissapointed with the rattle.
ebay has a new GM DM for $700.
I wish I had gone that route.
http://www.ebay.com/itm/90-91-92-93-...f936a2&vxp=mtr
Its hard to imagine that GM picked a tranny that required a "fix" before it could be used.
Last edited by Blue95C4; Sep 29, 2012 at 01:35 PM.
Team Owner
Joined: Oct 2004
Posts: 81,241
Likes: 3,063
From: altered state
St. Jude Donor '05
Its a performance car its gonna make some kind of noise;plus its practically sitting right in your lap lol.
If Gm didnt build strength into these but were whisper quiet then people would complain they break all the time. Ugh.
Ive driven a number of C4s with the aluminum flywheel and hated it every time.
If Gm didnt build strength into these but were whisper quiet then people would complain they break all the time. Ugh.
Ive driven a number of C4s with the aluminum flywheel and hated it every time.
Last edited by cv67; Sep 29, 2012 at 11:54 PM.
Safety Car
Joined: Oct 2008
Posts: 4,022
Likes: 30
From: Los Angeles CA
That's what my engine installer says, but the rattling wears on you, it's a different kind of annoyance, like water-boarding, you know ya ain't gonna die, but, it sure is uncomfortable.
That said there's plenty of faster cars that don't rattle; since they don't make the dual mass anymore, the noise is here to stay, spec put out a 28 lb single mass a year ago, the 22lb steel one didn't help, god be with you on the aluminum
That said there's plenty of faster cars that don't rattle; since they don't make the dual mass anymore, the noise is here to stay, spec put out a 28 lb single mass a year ago, the 22lb steel one didn't help, god be with you on the aluminum
Race Director
Joined: Nov 2003
Posts: 12,221
Likes: 446
From: Overland Park Kansas
2020 Corvette of the Year Finalist (appearance mods)
C4 of Year Winner (appearance mods) 2019
Several of the German Luxury cars were equipped with Dual Mass Flywheels.. Mercedes-Benz, BMW, Porsche, and Audi.
I spent $2000 for a single mass including preasure plate and install and I am dissapointed with the rattle.
ebay has a new GM DM for $700.
I wish I had gone that route.
http://www.ebay.com/itm/90-91-92-93-94-95-C4-CORVETTE-ZR1-LT5-DUAL-MASS-FLYWHEEL-NEW-GM-10174481-ZR-1-/221039376034?pt=Motors_Car_Truck_Parts_A ccessories&hash=item3376f936a2&vxp=mtr
Its hard to imagine that GM picked a tranny that required a "fix" before it could be used.
I spent $2000 for a single mass including preasure plate and install and I am dissapointed with the rattle.
ebay has a new GM DM for $700.
I wish I had gone that route.
http://www.ebay.com/itm/90-91-92-93-94-95-C4-CORVETTE-ZR1-LT5-DUAL-MASS-FLYWHEEL-NEW-GM-10174481-ZR-1-/221039376034?pt=Motors_Car_Truck_Parts_A ccessories&hash=item3376f936a2&vxp=mtr
Its hard to imagine that GM picked a tranny that required a "fix" before it could be used.
GM picked the ZF because it was THE ONLY 6-spd available at the time of the C4 ZR1 inception. It was their only option if they wanted to fit the ZR1 with a 6 speed -- unless they wanted to delay production at least another year.
Getting into a stick C4 (or even auto) can be disappointing the first time. Some people consider it the halo of GM cars and expect perfection. It's not a Caddy, it's a car built for performance, break-thru aerodynamics, and even performance/emissions (for that era).
Burning Brakes
Joined: Aug 2010
Posts: 951
Likes: 3
From: Placerville CA
Some people consider it the halo of GM cars and expect perfection. It's not a Caddy, it's a car built for performance, break-thru aerodynamics, and even performance/emissions (for that era).
Is it the first hybrid? Instead of Corvette (a small warship!) maybe GM should have named it the Chimera -- half human and half beast.