I am looking for a twin disc clutch that can still be slipped somewhat.

The Spec Super Twin Clutch Kit is about 1200 and seems to fit the bill. Anyone have any weight info on this unit? I was going to use the single Tex unit but I am opting to get something with more clamping power and a better pedal feel.

Feel free to suggest alternates if you have any experience with another unit. I heard the tex comes in a dual disc version. I am looking for a balanced unit that is lightweight and can handle what is likely to be near 700+rwtq on my new driveline. This is with very sticky tires. I am sold on the dual friction so I will not entertain single disc miracle clutches.

 

GTODoug has a Zoom dual, pretty new model, and he's happy with it after going through several clutches. You could give him a shout, he'll tell you some horror stories about a couple of the models you mention. He's had two of the three above.


Or call Roger at our shop, he's installed several and is happy with them.

http://forums.corvetteforum.com/show...350&highlight=

 

From all my research and talking to people about clutches lately, I have heard a lot of good about the Spec Twin and McLeod Street Twin. Both are supposedly good for 1200 HP. Bob (Wicked Weasel) at ECS has a lot of good things to say about the Spec Twin. We were supposed to talk more about it at Toys for Tots, but I didn't make it. You may want to drop him a PM.

Spec Twin Thread

McLeod Street Twin

 

Spin, I used the Exedy twin disc in my T-1 C5 RR not cheap but was great. I could slip it, great pedal feel and because of the spinning drive shaft it had a better release and less weight it (driveshaft) slowed quicker to aid shifting, this was a common problem for the road race guys. The last I knew it was still strong after 3yrs. of racing. My C5 was only 400 rwhp.
Hope this helps, but I do hear good things anout the Spec products.

 

Tex twin can be slipped but it takes some finesse.. Heat it up and slipping it gets trickier. It does chatter, its not nearly as soft as the tex single disc but has no problems holding lots of power.. Ive got 612/584 at the tire and haven't had any issues with the clutch holding the power with r-compound tires.. BenDiss drove my car as well as a vette with a spec twin, tex single and possibly a few others.. You might be able to get a pretty good comparison from him..

 

I've been running the Mcloed duel disk clutch for years, and upgraded to the new version about a year ago. It's rebuildable, durable, shifts well, and holds ALL the power!

It does not like to be slipped much, but you will get used to the on/off effect of it.

Works for me!!

JB

 

We used the SPEC Twin Disk 'P Trim' for our customers 960 rwhp Z06. These clutches have been the best we have used for holding power.

Which model were you looking at? There's SS, P, ST, and E trim. If you're still shopping, shoot me a PM and I'll get you a great price on them.

SPEC Twin Disk Clutches

Seth

 

RMCR votes for the Spec twin in the higher hp cars. I hate Spec but I may have to bite the bullet with them as well. Was not aware there are different compounds. Need to look into that too.

 

I am in the market for exactly the same thing.. While my stock clutch is holding up pretty darn well so far with frequent fluid changes I'm sure it's not long for this world.

I've been eyeing the Spec Twin, Fidanza Twin 7.6 (thw Zoom Twin seems to be a clone of the Fidanza), Tex Twin, McLeod Street Twin and RXT Twin and RAM Twin.

Keep in mind I haven't owned any of these Twins, my comments are just from my researh and thread hounding.

While the Tex Twin seems like a good clutch I shy'ed away from it because of long wait time for customer service due to them being in Australia. Then I saw the need for the floater plate to be strapped to cut down on the noise. Without a strap the floater plate rattles around at idle. So that also ruled out the Tex.

The Fidanza 7.6 and corresponding Zoom seem like good choices. The Zooms seem to be knock off's or re-brands of the Fidanzas. Haven't heard anyhting bad about them although there is not much info on them. They have aluminum flywheels (if thats your bag), strapped floater plates and support 900 foot pounds, small diameter disks for low MOI. There is another version that only supports ~600 foot pounds (Fidanza 6.7) so be sure to get the right one. Definitely the lightest of the bunch.

The SPEC Twin fairs very well in reviews, especially considering the gobs of bad threads I've seen about their single disks. Most people who talk about the Spec Twin are talking about the P-Trim which supports ~1400 foot pounds, but there are four other trims that support anywhere from 900 to 1800 foot pounds. It's the only billet pressure plate cover I've seen, very nice looking. Strapped floater and steel flywheel on the SPEC if you prefer that. They claim no shimming or aftermarket master or slave is required which is nice.

The McLeod Street Twin is known to be bulletproof but there are a few things keeping me from going that route. A. They just look like they would be wicked heavy. They are a full size disk and pressure plate unlike the above. B. I read a lot about the need for an adjustable master with the McLeod products. Whether thats just to sell masters (as they make those too) or if it's really needed I don't see it talked about much on other clutches and I'd rather pass on a new master. The RXT seems kind of neat but I don't like that you need to provide your own flywheel which would necessitate the need for a rotational balance. Again the RXT is a full size disk/plate although lighter looking than the Street Twin.

I've had some bad personal experience with RAM's so I don't even consider them. My friends refuse to provide beer paid labor if I bought another RAM and a Y-Body clutch job is not much fun, nevermind trying it by yourself.

So I'm pretty much on the fence between the Fidanza and the SPEC and I'm not sure which SPEC I'd go with. The SS Trim (900 foot pounds, organic disks) would be the smoothest but I am still leaning toward the P Trim (1400 foot pounds, carbon graphite disks). I think if I could get the P Trim at the SS Trim price I'd jump at it.

HTH

 

I like the weakest of the twin spec bunch which seems it would have the best street manners and 900hp clamping sounds great.

I had no issues with my spec 3 w fidanza flywheel on my C5 (H/C forged motore and progressive 250 shot). It gave me no greif but then I had probably done the best ever break in on that clutch ever done by anyone. I did what seemed like 1000 stop and go's in a parking lot over the course of a few days. It had zero engagement chatter, awesome clamping, and the pedal feel was stock. Others say they had it blow up.....go figure.

The RAM 921hd was the worst clutch I ever had. I tried to baby it as break ins go and yet it would bang so hard going into gear that it eventually killed my slave cylinder. Hate is a good word for it. Odd pedal feel and it was way out of balance when I bought it.

One of my concerns with a 1200 dollar clutch such as the Spec twin is that I feel it should come fully balanced but who can take the chance? You would wish a vibration would be fixable for 100 bucks if you install it and it was out of balance. Taking the car back apart because you didnt have it checked for balance will be the longest day of your life.

Anyone using the twin spec have a comment of its balance out of the box? I recall one incident on this forum where a customer who bought a tex oz700 which is advertised as fully balanced wasnt. Tex of course made good on it but who pays for the second install and how long are you down for waiting for the unit to be balanced or replaced? Not worth the chance.

Unrelated to the advanced models being mentioned here i want to make a note for the LS7 shoppers. I read more than once that people think the LS7 clutch comes fully balanced. First off the clutch/pressure plate and the flywheel are shipped separately so they arent matched sets. Second, the pressure plaate and flywheel arent keyed so they can go together in 6 different positions. Third, in our machine shop our 30yr veteran said the Ls7/fidanza combo I brought him had a nearly perfect flywheel and the LS7 pressure plate was the single worst clutch he has had to balcance in his career. He drilled so many holes in one side I was worried about structural integrity (exaggeration). Once balanced the LS7/fidanza has been a dream on the street and holds the 600rwtq on the street with drag radials. I just dont think the 10 pound boost its about to get will be ok with it.

 

I've got the Spec twin disc and while it may be good for high hp, it also shakes the sh#t out of my dash! If this doesn't correct itself...that is coming out.

 

have driven cammed c6z06(555whp) w/ ram twin and was impressed w/ how stock-like it acted...from take-off to power shifting, not an on/off clutch and rated for 1000hp ...will let you know the results from the dragstrip on 315 dr this sat

 

Searching for MORE on GM LS7 clutch/pressure plate and the flywheel fully balanced...

HOW DO I GET THIS DONE TODAY..(exaggeration but need) so I can install it SOON?
Where can I buy a fully (or partially) balanced unit?
How much should balancing cost?
ANY LEADS Please help...... Sorry to step on your 4 yr old thread Spin........


I've tried a high dollar non stocker and it is not for me.

 

I love my new Mantic twin disk. The guys at ECS are awesome and this clutch is 100% of everything they said it would be. Slips like stock, holds like a gorilla, and pedal is soft enough for my 4'11" wife to drive it.

 

Did you hit the track yet?

 

Not yet Joe. Possibly thursday if the weather looks promising. I'm not totally thrilled with the idea of driving on the drag radials in their current state.

 

ANY NEW Noises? Any new chatter?


THANKS! Seems like I might have seen you previously post ECS had guarenteed 100% satisfaction too????????? MAYBE WAS NOT YOU or IS My imagination.... (lmk?)

I'm sure my car is sporting less than 500 rwhp! maybe 460?....

 

Ya, that was me. ECS posted up in my 'clutch choice' thread and personally offered me a 100% satisfaction guarantee. The street/daily driver performance is near-flawless. I'm just waiting for some track time before I decide how much I love it. So far I'd give it a 9 out of 10.

I've taken my time breaking everything in slowly and with purpose. I have 1000 miles on it now so its about time to let it rip.(I also changed my rear diff so that factored into the break-in)

I followed Doug and Chris' advice and so far it has lived up to their exact descriptions. I'm anxious to see how it feels/performs at the track.

 

Thanks again for more feedback!!!!!!!!!!!!!!

Diff issue but one I'm trying to reduce... I have a lope/surge from about 1.1 to 1.3 so I have some small concerns about changing overall clutch package weight. (Tuner says he can make surge/ lope better - but in reality - there is a very slight constant load there so will see.) Not much of a problem to have.

Need to sort one thing at a time. Car is FUN!!!!

 

1100-1300rpms? I have always had a slight hiccup at 1600rpms with my cam and I don't know if much, if anything at all, can be done about it. With 3.90 gears, its hard to get the rpms that low. The motor loves to rev and it's constantly in the 1500+ range