Thanks for posting Mike.

Its not that I think the DD is not doing the job its intended to do - which is to be smooth, and handle power in a tractable way.

The point is that its fiddly. And its Fiddly even sometimes when ALL the parts are new. And god forbid that any of the parts are not PERFECT, as then it just becomes this quagmire of idiocy and checking-rechecking.

(Wow - GREAT stuff on that website - I have QUITE a few things from there! - Well, at least 2)

Maybe because of the text communication process, I am not being clear. I will not take any working clutch out of a working car to try something else.

BUT - It is frustrating enough for me to NOT use when I HAVE the CHOICE, which I do when I am talking about the 78 with the 89 engine and SC. Also, with the race car that I have nearly all the parts for but no space to put together.

I will continue to hate and deride the DD clutch that I am using daily in Leeroy. I think it should work BETTER, and should be less work to make right. I think it should not be so sensitive to changes in the microscopic ridges in a 200 dollar steel shaft, as well as the comings and goings of an under-built throw out bearing.

All that said - I have already made the decision to get your flywheel and throw out bearing. Its just too simple of a decision - the ability to buy one or two items, and Voila - I can buy pieces off the shelf. I love the 928 so much - but what do I like I about it - I don't know - all I ever want to do is change them.

Your pieces are priced very well for what you are creating. Is the engagement at all usable for the street? I can handle alot of bumping to NEVER have to deal with a clutch that causes you to destroy a transmission synchro set in short order.

Am I exagerating on the DD clutch? Possibly - but I am really frustrated. I quadruple and sextuple checked that damn clutch before I buttoned Leeroy up and its still causing issues.

 

I'm not seeing any downsides Mike, to your system:

http://www.hrpworld.com/index.cfm?tp...action=product

500 bucks for a 2 plate system that can handle over 800lbft.

 

It's a push type so it couldn't be used with the stock pull type pp.

There is plenty of travel in the hydraulics of that Tilton part which is good. It's basically a hollow hydraulic cylinder with a bearing on the end. One thing that needs to be done when going to these is to install a pedal stop to limit pedal travel. The travel is noticably less in one of these because of eliminating linkage flex. The Porsche isn't so bad but some other cars can have quite a bit of the pedal travel being used by the cumulative effect of stuff seating and flexing.

 

So the other project would be to make a Chevy-splined intermediate shaft so you don't have to use the Porsche splined stuff from tilton?

 

Well if it really does bother you to potentially adjust it, you don't have that with the Tilton and other racing type twins. They have nothing to adjust and don't need it. In theory they might make uadible rattle noises so that's probably why Porsche has the things that require adjustment, they stabilize it.
Obviously I would use a racing type twin before a honkin' single but I honestly don't feel my own clutch setup is a huge improvement over the Porsche DD.

 

No need. They stock Porsche splined discs. The cerametallics are more expensive than the sintered irn though. IIRC 250-300 bucks for a pair of discs?
Also it would be difficult to make a new shaft as good as the Porsche one.

 

How is the drivability?

 

One thing we can be thankful for - that we don't have to do this to replace the clutch:

http://www.vetteweb.com/tech/vemp_08...tch/index.html

 

In my experience they have not kept the adjustment that I have made.

 

There seem to be differences in what is considered "driveable". I had the same clutch setup in another car and felt it was very driveable. Once I let someone drive the car and he couldn't even back it out of the parking spot and he was a 'Vette racer. Beats me.

The current setup in my 928 racer would probably be considered poorly driveable by some but I think it's just fine.
A real sports or high performance car is supposed to have traits that require you to adapt, I've never understood how people buy a "sports" car and complain that it's not like a Camry.

So to answer your question, the driveability is fine unless you're a soft, timid, babbling ball of laziness

 

Ah. Like I said, I can put up with alot of issues as long as its not be having to redo anything I have already done. I think thats my top pet peeve. Other people whom I have had try to drive the 928 have not done well, so maybe I am one of t he lucky few with an intuitive left foot.

 

You can also get organic 7.25 discs from Tilton.
I plan on trying those in my street 87. That would be like a Porsche DD without the pull release bearing and adjuster thingies!

 

So it is the disk friction and not the movement of the hydraulic throw out bearing that produces the feel?

 

Brendan, I am actually looking at making a new IP that will remove the need for any adjustments.....

Just be patient as I can only do one thing at a time.

 

Yes, disc friction is the difference between a "streetable" organic disc and "on/off" racing disc.