Spec Clutches...
11-14-2012 | 08:36 PM
#1
Thread Starter
Joined: Jul 2005
Posts: 3,782
Likes: 7
From: Port Neches, TX
Spec Clutches... ... Any good? I'm looking at the Stage I, v2 that's supposed to be rated 599 ft-lbs. This would be in a 2500# street car with an L-92/AstroGear Ford T-5, so I'd rather have the clutch be the weakest link...
11-15-2012 | 10:09 PM
#2
Thread Starter
Joined: Jul 2005
Posts: 3,782
Likes: 7
From: Port Neches, TX
Ummm, OK. So it's better to risk replacing a $3000 gearbox than a $400 clutch? I'm not saying that's how it'll go down, but I'd rather do a clutch replacement than crate up and send off my trans, wait a month, pay shipping both ways, and God knows what on the rebuild. This is a street car, I want a decent pedal and smooth engagement. Not interested in all-out "bulletproof" for this particular part. In reality, a stock GM clutch would prolly work just fine. Just wanted to inquire on how good/bad the Spec parts are...
Already have a new Fidenza aluminum wheel.
Already have a new Fidenza aluminum wheel.
11-17-2012 | 08:19 AM
#3
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Joined: Jul 2010
Posts: 1,756
Likes: 4
From: Maryland
I cannot comment across the board here, I know that with the CTS-V's using LS7 slave, the SPEC clutch is absolute junk. Every single person that installed one had engagement issue's and the clutch would not release at high RPM's.
BTW - SPEC never did anything for anyone...except tell them they had to bleed the slave, which was not the problem.
BTW - SPEC never did anything for anyone...except tell them they had to bleed the slave, which was not the problem.
11-17-2012 | 08:42 PM
#4
Thread Starter
Joined: Jul 2005
Posts: 3,782
Likes: 7
From: Port Neches, TX
I cannot comment across the board here, I know that with the CTS-V's using LS7 slave, the SPEC clutch is absolute junk. Every single person that installed one had engagement issue's and the clutch would not release at high RPM's.
BTW - SPEC never did anything for anyone...except tell them they had to bleed the slave, which was not the problem.
BTW - SPEC never did anything for anyone...except tell them they had to bleed the slave, which was not the problem.
11-18-2012 | 01:17 PM
#5
TECH Veteran
Joined: Apr 2008
Posts: 4,937
Likes: 102
IMHO a Kevlar disc material is not ideal for street use (SPEC 2). Beating on them is ok for track use but normal city driving will cause the disc to glaze
SPEC can make a decent clutch, my experience was they did not last long under track use. part of the $ of racing.
You mention you want the clutch to be the weakest link in drivetrain...well a forgiving clutch (typically a level 1 rated clutch (organic) in a given manufacturers line of disc material offered) will slip under higher than stock motors way sooner than a disc with more aggressive materials like kevlar or the harder composition materials offered.
Companies like McLeod offer a disc with dual surface material. One side organic and the other side a puc type metalic composite material. Other companies also offer this type of disc.
SPEC 3+ IIRC is a full face non Kevlar composite type disc which will hold power but give up some street maners. This may go against your idea of having the clutch being the weakest liink though...
SPEC can make a decent clutch, my experience was they did not last long under track use. part of the $ of racing.
You mention you want the clutch to be the weakest link in drivetrain...well a forgiving clutch (typically a level 1 rated clutch (organic) in a given manufacturers line of disc material offered) will slip under higher than stock motors way sooner than a disc with more aggressive materials like kevlar or the harder composition materials offered.
Companies like McLeod offer a disc with dual surface material. One side organic and the other side a puc type metalic composite material. Other companies also offer this type of disc.
SPEC 3+ IIRC is a full face non Kevlar composite type disc which will hold power but give up some street maners. This may go against your idea of having the clutch being the weakest liink though...
