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| djxib | Single mass flywheel w/unsprung clutch hub | ||
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Senior Guru
 
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I just received my Spec stage 3+ clutch and the clutch disk hub is unsprung. I spoke to LMPerformance (Spec) and they told me that it is designed with a solid hub (contrary to the description on their website).
My 1992 LT1 has a single mass flywheel, which is why I ordered the Spec. I'm kind of OK with having an unsprung hub / single mass flywheel, but wanted some opinions on street drivability before I decide whether to install the clutch or maybe shop around for a sprung version. |
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Posted on: 2011/7/21 20:54
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Andy 1996 Greenwood Collectors Edition LT4 Previously 1992 Convertible Polo Green. 383 LT1/LT4 forged/balanced. V7-YSi, Alky. 608RWHP... Now sitting at a dismantler with a salvage title. Still runs... |
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| 89Vette | Re: Single mass flywheel w/unsprung clutch hub | ||
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Senior Guru
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The only guy who I read about installing a SMF and unsprung clutch ended up converting to an automatic transmission. That's because he HATED the driveability and noise.
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Posted on: 2011/7/21 21:26
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383 stroker -- Semi-Siamesed SLP long-runner intake, AFR 195's, 4-2-1 headers, and a SR cam. ZF6 short-throw shifter. Custom body/interior. |
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| rklessdriver | Re: Single mass flywheel w/unsprung clutch hub | ||
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Senior Guru
 
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The Stage 3+ is crap load of clutch.
All of the Stage 3+ I have seen were sprung hub. The Stage 4 is solid hub but it's a puck style. Maybe you got a clutch set up for the Dual Mass FW?? I run the regular Stage 3 (sprung disk 6 puck) and it hit's so hard (if I just dump it) that I can explode the rear end at will. Took me a few tries to learn how to launch the car without destroying stuff (wa an expensive learning curve). I would not run an unsprung disk with a Single Mass FW. Will |
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Posted on: 2011/7/21 21:32
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1984 Corvette. 434 SBC with a Powerglide. Best pass - 8.48@160MPH 1.23 60ft on MT 275/60R15 Radials. 1972 Corvette. LS5 454 BBC with M20 4 speed. Best Pass - Doing good to just pass a gas station. |
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| SJW | Re: Single mass flywheel w/unsprung clutch hub | ||
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Guru
 
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I can't speak from personal experience (I'm running a sprung-hub Stage 2 Spec clutch with their extra-weight billet steel SMF in my '94), so I can't comment on driveabilty issues, but I would be very wary of installing a solid-hub clutch disc in a car with a SMF. Those hub springs help to soften driveline shock, and without them, or the springs in a DMF, I'd be worried about grenading gearboxes, D44s, driveshafts and halfshafts.
Did Spec recommend you go ahead and install that solid-hub disc with your SMF? Live well, SJW Edit: Looks like the previous reply got there while I was typing mine. So... What he said! Live well, SJW |
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Posted on: 2011/7/21 21:33
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| bogus | Re: Single mass flywheel w/unsprung clutch hub | ||
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Grand Imperial Pooh-Bah
 
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it won't be fun.
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Posted on: 2011/7/21 21:37
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The single biggest problem with communication is the illusion that it has taken place. - George Bernard Shaw Education is the best tool to overcome irrational fear. - me |
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| BrianCunningham | Re: Single mass flywheel w/unsprung clutch hub | ||
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Senior Guru
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this is for the YSI install?
you kind of limited to what's going to be able to hold that puppy. that's the reason I went with the dual disk, which is also going to be grabby. I'm less worry about that, more worried about the shock to the drivetrain. |
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Posted on: 2011/7/21 21:50
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Polo Green 95 LT1 6-spd http://mysite.verizon.net/vzevcp74/ 383 LT1/Vortech Supercharger/AFR heads/Rod end suspension/Penske-Hardbar dual rate coilovers/Wilwood 6pot brakes NCCC Governor: http://BayStateCorvetteClub.com |
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| djxib | Re: Single mass flywheel w/unsprung clutch hub | ||
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Senior Guru
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Quote:
Initially, yes, but they are going to go check. |
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Posted on: 2011/7/21 22:13
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Andy 1996 Greenwood Collectors Edition LT4 Previously 1992 Convertible Polo Green. 383 LT1/LT4 forged/balanced. V7-YSi, Alky. 608RWHP... Now sitting at a dismantler with a salvage title. Still runs... |
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| djxib | Re: Single mass flywheel w/unsprung clutch hub | ||
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Senior Guru
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Quote:
Yes - for the YSi install. I'm also concerned about the drivetrain, but I have some experience with race clutches and feel confident that I could control the launch with a bit of slip/higher revs. I'm going to wait on Spec, but at this point I am planning to agree/return the clutch for a sprung hub unit. |
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Posted on: 2011/7/21 22:16
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Andy 1996 Greenwood Collectors Edition LT4 Previously 1992 Convertible Polo Green. 383 LT1/LT4 forged/balanced. V7-YSi, Alky. 608RWHP... Now sitting at a dismantler with a salvage title. Still runs... |
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