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-   -   The Twin Screw Thread (https://rennlist.com/forums/928-forum/242321-the-twin-screw-thread.html)

Jim_H 12-09-2005 05:29 PM

The Twin Screw Thread
 
With Andy phasing out of the TS world and many of us having his systems there are a lot of questions and ideas that I think arent going anywhere. Maybe this can be a thread where we can do some Q & A and maybe improve on what we have. Maybe even swap some parts.

For instance, somehow the fact that the pre S4 radiator hose (ds) remedies the cut hose problem didn't get passed along to all.

Critiquing the system is fair game also, especially if there is a solution by the critquer :burnout:

Jim_H 12-09-2005 06:26 PM

928 SP SC link
https://rennlist.com/forums/928-forum/230957-sneak-peek-supercharged-by-928-specialists.html

Customized Supermodel set up.
https://rennlist.com/forums/928-forum/242306-sc-install-with-links-to-pics.html

Tony 12-09-2005 06:31 PM

3 Attachment(s)
Also, if you have the snout support with the 3 aluminum cyclindrical spacers on the back...CHECK them. One of the spacers on Darriens "kit" was a different length. If it was supposed to be that way, i havent seen anything to show me that?
It skewd the whole alignment of the tensioner/ilder pulley and messed it up. Scuffed up a SC belt as well when the car was first started and the belt found its comfortable running position.....half of it folded up on to the AC pulley! :banghead:

By adding a couple of thin washers to the spacer i got Darriens belt running smack dab in the middle of the idler pulley.

Ive got a few things relating to the I/C system that cleans it up a bit. The newer manifolds have the I/C inlet pipe on the top. The older ones were in the front and allowed for a more stealthy run of hose to the heat exchanger.
I fab'd up a 180' turn for Darriens so the hose can now run under the snout and down along the lower rad hose where it eventually meets the heat exchanger inthe front bumper.
this was the copper fitting i made
http://members.rennlist.com/v1uhoh/Ic180fitting.JPG


Ill get a pic of it at some point. Its not really needed, but we didnt care for a big 3/4" hose coming off the top of the manifold towards the passenger fender area.

Also, something im looking into eventually is some more boost. With a swap to a smaller pulley i think you will run up against some significant belt slip as we dont have the nice belt wrap like DR has on his setup :bowdown:
Another way to increase the boost besides going to a smaller upper pulley is to make the lower pulley bigger :evilgrin:
I havent tried it yet or done the math on the pulley ratio/boost etc. but believe it or not, the MURPH lower pulley may be useable on the TS set ups. Even though Murph uses 8 rib and the TS 6rib, the plane that they run in is the next position fwd of the AC pulley. This would give you a larger LOWER pulley instead of a smaller upper......as not to get to wild you would probably have to go to a slightly bigger upper pulley also(hood clearnce???..dunno)! Just a thought for you Jim....since 460 HP isnt enough :evilgrin:


top...stock
middle...TS
bottom ...MURPH

Daryl 12-09-2005 08:24 PM

1 Attachment(s)
Jim,
I think this is a great idea! As well there are people out there that are about to install their SC who need Tech help.
My car was running open loop, not using a CO sensor. If anyone needs help in that area let me know.
I like the look of Bills throttle cable setup. Any chance of getting more info on that?
Heres a picture of my fresh air intake. Easy to do.

Tony 12-09-2005 08:39 PM

BINGO.
Details on that Daryl. We are looking for some solution on Darriens 86.5..what did you have to move to do that.
Coil....jumpstart terminal?

Pics please...inside the fender as well. I like it.


Good idea ya posted here Jim :cheers:

We are using Bills set up on Darriens car also. Gives a nice clean approach for the cable to the throttle linkage on the TB.

Ill grab pics next time i go up there.

MrLexse 12-09-2005 09:30 PM

Could this be done on the Supermodel forum, or is it defunct?

Shane 12-09-2005 09:45 PM

Sad to say but.... I am almost relieved that my car went up in smoke. Now I am free of the whole cobbled together mess and can start fresh with a more user friendly system that has some REAL customer support!!

I miss my car, I miss running a 928 with boost but not much else....

Jim_H 12-09-2005 09:48 PM

A bigger lower pulley... I like it. What boost do you run consistently Tony and do you have to tighten your belt a lot to keep your boost up.

Tony 12-09-2005 09:50 PM


Could this be done on the Supermodel forum, or is it defunct?
IMHO...From what i can gather people arent being given the time of day on that forum from the person that should be giving it.
So, why give the forum the traffic and the owner the return favor.

There is a great wealth of knowledge and diversity on THIS forum alone that can be of benefit to the folks out there who run the twinscrew. The people who provide it dont have access to the "supermodel" forum and most likely arent TS owners, so if they want to chime in on this thread they are more than welcome to and dont have to be "approved" to do so..

I imagine over time the thread here will fall off the pages or perhaps turn into a TS vs CS vs TURBO debate but in the mean time it seems like a pretty good idea?

Jim_H 12-09-2005 09:51 PM

No doubt there are better ways to end the Supermodel system than the way Andy has. I think he is just burned out. Are you selling the TS?


Originally Posted by Shane
Sad to say but.... I am almost relieved that my car went up in smoke. Now I am free of the whole cobbled together mess and can start fresh with a more user friendly system that has some REAL customer support!!

I miss my car, I miss running a 928 with boost but not much else....


Shane 12-09-2005 09:55 PM

I am. Or already have as soon as I can get it off the car and shipped to Warren. He has a partial from Andy, so maybe with what is usable from mine and what he has already got, he can put together a useable system.

Tony 12-09-2005 09:56 PM


Originally Posted by Jim_H
A bigger lower pulley... I like it. What boost do you run consistently Tony and do you have to tighten your belt a lot to keep your boost up.


i seem to run appx 7-8lbs on most of the logs i have looked over. I havent tightened my belt in a while and im sure it could use it, but i need a shorter belt really. I have placed marks on the belt and the SC pulley and it does slip now and then.
:cheers:

Shane 12-09-2005 10:01 PM

At sharktoberfest Bill and Derek, mentioned that the inlet and relief on the BEGI was backwards causing full rich conditions which I had any time I ran 30# injectors. Does anyone have a diagram on how it is supposed to be? Might help future installers from going down the same road.

BC 12-09-2005 10:07 PM

Tony are you going to try for 10 or 11? I'd really like to see the power curve on that. It would be great to compare that to whomever else has gone that high. Do you have enough fuel for that?

EB338 12-09-2005 10:47 PM

Has anyone taken over from the Supermodel kits? Are the 928 Specialists kits the continuation of what was being done? They sure look similar. Do they have the same intercooler manifold setup? How close are they or are they the same thing, or am I totally out in left field here?


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