Based off the Spec website for prices, and since I need a new flywheel, which would you choose? car is a 94 lt1 with cc306, headers and exhaust, soon to be a turbo build. The spec 4 setup is around $900 and the Mcleod twin disc is $1,250, which also includes a adjustable master cylinder.

 

Get the twin, no brainer there. I've gone through 2 spec clutches in my day, spent enough to get a street twin and then some.

 

I have the spec stage 4 and I love it. It does take some getting use to since it have a solid hub so it's not something everybody wants to daily drive but its not as bad as I thought it would be

 

ive have friends that use both of these the spec doesnt seem to last as long and is not very dd friendly.

 

With the extra power and torque from the turbo in the near future, I spose the Spec 4 might have trouble keeping up and lasting long? How is the quality of the twin disc and components like the adj. master?

 

The Spec 4 is extremely aggressive, but like anything there is a technique to it and you can adapt to driving it every day if need be. I had a Spec 4 in my car for at least three years and it held up very well on the street and strip. I wouldn't use it unless you have an aftermarket diff. It would put hella stress on it regardless of the driving conditions.

 

I have the ST, and it is a brutal clutch. Very hard on parts, and in a DD application, would get old.

 

I know both clutches would be harsh on other drivetrain components, but i was wondering what you mean by if it were a DD app. it would get old?

The diff. will be upgraded shortly after clutch purchase.

 

I've been running the street twin for about 5 years, no experience with SPEC. The nice thing about the ST is you can send it in for a rebuild when the clutch fibers get worn down. I have done so once and it was reasonably priced, much less than a new clutch. I don't daily drive my car but if I had to I could get used to the ST. It will start to chadder a little if you have to drive in stop and go traffic for an extended period of time, it doesn't like to be slipped a lot.

OP, did you mean an adjustable master in your original post or do they now have an adjustable TOB?

 

It can be slipped, but not for very long. Working an "on/off" clutch in traffic is not for everyone.

 

I think he ment adj master there is no adj t.o. that I'm aware of

 

AHHH yes you are correct. That is my typo and I will change it. I was wondering how long the S.T. lasted before you had to send the disc's in? Also, what was the driving conditions before the clutch was sent in? Street & Strip? Track only? If at the track did you use slicks?

 

I see what you mean. Would the Spec 4 be the same way though?

 

Yeah I have the spec and it can not be slipped since it has a soild hub. You just have to give a little gas and dump it to take off

 

How long have you had your Spec? What use do you use it for street strip?

 

I've had mine since August I've put about 3000 miles on it. The car is made for street/strip haven't had time to get it to the track but it is also my dd. I love the clutch it just takes some time to get use to and if you care about chirpping the tire at almost every light then its not the clutch for you

 

I care about the longevity and performance of the clutch, and also expect it to withstand 500-600rwhp with years of abuse.

 

Mine is 95% street driven and has seen the track with slicks. I've made many 5500-6000 RPM launches on ET streets and the clutch didn't seem to mind at all. I'm not anywhere near the power level you plan to be at though, from my understanding the ST is rated to 800 FWHP. The longevity is good but all depends on how you drive and the application, as with anything else.

 

Yeah the life on all clutches depend on how you drive. Like with the spec if you slip it during break-in or try and drive it like a normal clutch and slip it a lot it wont last long at at. For a lot of puck type clutches you have to change the way you drive for the clutch to last

 

Spec 3 is a great clutch, been holding up well in my old 383 m6 car for 6yrs now. I have seen it hold 614whp on a 383 procharged car for quite a few seasons. Imo it's about at that line where it still retains good street manners but yet is still agressive. Imo the 4 is ok but requires more "technique" to take off. The 3 still will let you slip it some... although the key is not slipping it at ALL during BREAK IN!!