Notices
928 Forum 1978-1995
Sponsored by:
Sponsored by: 928 Specialists

The Twin Screw Thread

Thread Tools
 
Search this Thread
 
Old Nov 24, 2014 | 05:18 PM
  #2491  
Darien's Avatar
Darien
Rennlist Member
20 Year Member
 
Joined: Dec 2004
Posts: 2,674
Likes: 265
From: Southwest
Default

After the final tuning and exhaust

https://www.youtube.com/watch?v=gd7K...ature=youtu.be




[QUOTE=Tony;11827190]448 rwhp...442 rwTQ...and after looking at a dyno video that was in 2007. I have since upgrade to 42lb injectors, Sharktuned it and improved the airflow into the MAF. I really should go get it done again...but im sure im north of 450 now??

2007.


Dariens car...it has since been well sorted out!
Attached Images
File Type: jpg
475hp-502tq dyno.jpg (62.9 KB, 882 views)
Reply
Old Dec 16, 2014 | 10:27 AM
  #2492  
hans14914's Avatar
hans14914
Rennlist Member
20 Year Member
 
Joined: Aug 2003
Posts: 2,679
Likes: 357
From: Indianapolis
Default

The prototype intercooler arrived last night. It may be difficult to tell from the these pictures out of context, but the upper air guide/shroud and the bottom of the end-tanks are designed to promote flow and equal filling of the intake ports (yes, I know the system is under pressure, and that these are not necessary features). Placement of the core is now centered in the manifold, and there is enough of an air gap inside to hopefully allow for the most direct and symmetrical air path possible.

You can also see the custom bulkhead fittings with the sealing nuts installed. The intercooler fittings will exit the lower manifold through holes machined in the back. The nuts have a captive o-ring, and will screw tight against the rear external face of the lower manifold with some thread sealant providing an air-tight but field serviceable assembly. The intercooler can be removed for maintenance, or a basic kit upgraded to intercooled int the future.

The fittings are a standard -16AN for flow to exceed what is necessary for a 500hp constant duty. I will try two pumps and adjust as necessary, both brush-less and rated for coolant and automotive environment with extended service life. One has 3/4" hose fittings and the other 1".

Getting ever closer. Hopefully the new rails will be here next week.

Thanks
Hans
Attached Images
File Type: jpg
IMG_3907.jpg (140.2 KB, 818 views)
File Type: jpg
IMG_3908.jpg (68.0 KB, 807 views)
File Type: jpg
IMG_3909.jpg (106.9 KB, 798 views)
File Type: jpg
IMG_3910.jpg (131.7 KB, 785 views)
Reply
Old Dec 16, 2014 | 02:24 PM
  #2493  
Tony's Avatar
Tony
Addict
Lifetime Rennlist
Member
20 Year Member
 
Joined: May 2001
Posts: 14,697
Likes: 598
From: Las Vegas
Default

W O W
Reply
Old Dec 16, 2014 | 02:28 PM
  #2494  
AO's Avatar
AO
Supercharged
Rennlist Member
20 Year Member
 
Joined: May 2002
Posts: 18,926
Likes: 88
From: Back in Michigan - Full time!
Default

Just in time! We need to talk.
Reply
Old Dec 16, 2014 | 03:22 PM
  #2495  
Louie928's Avatar
Louie928
Three Wheelin'
 
Joined: Jan 2004
Posts: 1,611
Likes: 13
From: Mosier, Oregon
Default

Originally Posted by hans14914
The prototype intercooler arrived last night. It may be difficult to tell from the these pictures out of context, but the upper air guide/shroud and the bottom of the end-tanks are designed to promote flow and equal filling of the intake ports (yes, I know the system is under pressure, and that these are not necessary features).
<snip>
Hans
Beautiful work Hans. Yes, the same properties apply to air (fluid) flow whether at atmosphere pressure or some higher pressure. It'll take less power to run X mass of air through the system when fluid flow is optimised than if not optimised.
Reply
Old Dec 16, 2014 | 06:58 PM
  #2496  
yardpro's Avatar
yardpro
Rennlist Member
15 Year Member
 
Joined: Dec 2010
Posts: 1,972
Likes: 19
From: Morehead City NC
Default

Any ballpark on cost.
I will be ready for something in the spring...
LOVE the twin screw setup as it is the cleanest install..don't like the look of the murf style setups
Reply
Old Dec 19, 2014 | 02:18 AM
  #2497  
BrianG's Avatar
BrianG
Addict
Rennlist Member

20 Year Member
 
Joined: Jul 2002
Posts: 2,322
Likes: 18
From: Comox, BC
Default

It looks like it's about time to finish this Supermodel project. Circumstances have resulted in this thing sitting for about 5 years in this state of work. It starts and drives but that's about it.

Almost1-1.jpg

I will be working with Colin Jensan of Jensanracing.com, in Abbotsford, BC. Colin has been tuning these things with the SharkTuner for a while now, and is the Canadian distrubutor of all things JDS, up here.

Colin wants me to make a few modifications to the Andy Keel kit that I have installed on the car, the first of which is a change of injectors. He wants me to transition to the Siemens Deka4 60# injectors. This will require the fabrication of an adaptor for the smaller-diameter injector body, and the injector will now have to seal on the lower o-ring, rather than on the larger injector body. This will actually be a pretty simple CNC lathe project, so while I have the TL-1 turned on, I might just as easily turn a few sets of these things if anybody out there is interested in this modification. They will be turned from 6061 aluminum. I am thinking that they will be located by one or two 4mm bolts through the adapter flange, secured into threaded holes drilled into the Keel manifold.

The adapters will look like this, which is a 3-D printed version of the drawing below. (essentially the first-design Pizza adapter)
Briansinjectorbushingprototype2_zpsb8f4d85d.jpg

Like this drawing, which was the original Pizza bushing concept for the OEM style injector, when he wanted it it seal on the bottom o-ring, as the DEKA4 injector must.

Pizzabushing_zps6757f8a0.png

Price will depend on the number of sets, but I'm thinking about somewhere around $150.00- $200.00 US for the set of 8. I could get them anodized if we can all agree on the color. Black would probably work.

This will be a one-time operation, so if you think you might want them, speak up now. PM please.

Last edited by BrianG; Jan 31, 2015 at 01:39 PM.
Reply
Old Dec 19, 2014 | 02:09 PM
  #2498  
Tony's Avatar
Tony
Addict
Lifetime Rennlist
Member
20 Year Member
 
Joined: May 2001
Posts: 14,697
Likes: 598
From: Las Vegas
Default

Originally Posted by BrianG
The adapters will looks sort of like this picture, but be longer to provide the boss for the lower o-ring.



Price will depend on the number of sets, but I'm thinking about somewhere around $100.00 US for the set of 8. I could get them anodized if we can all agree on the color. Black would probably work.

This will be a one-time operation, so if you think you might want them, speak up now. PM please.
I bought a set of those adpaters ages ago..but..i think i have the 2nd? maybe 3rd manifold from Andy. These adapaters actually dont fit my manfifold...i was bummed.. Im still using the old rubber "grommets". One of these days when i need to remove the manifold for what ever reason i will machine the openings just a tad more so they fit..
Reply
Rennlist Stories

The Best Porsche Posts for Porsche Enthusiasts

story-0

Theon Goes Full Carbon Fiber With Stunning New Build

 Verdad Gallardo
story-1

Six Genius Porsche-Themed Gifts That'll Make Any Dad or Grad Smile

 Joe Kucinski
story-2

10 Used Porsches Are Selling for Way Too Cheap

 Joe Kucinski
story-3

Tuner Is Converting Porsche 911s Into Shooting Brakes

 Verdad Gallardo
story-4

This Coachbuilt Creation Is A Modern Take on the Legendary Porsche 917

 Verdad Gallardo
story-5

Is This Convertible Cayenne A Steal, Or A Returnless Investment?

 Verdad Gallardo
story-6

10 Best Non-Flat Six Porsches You Can Buy For Under $100K

 Joe Kucinski
story-7

Porsche's Top 5 Most Questionable Naming Decisions

 Verdad Gallardo
story-8

Pogea Racing's 964 Porsche 911 Reimagination Stands Out in a Crowded Field

 Verdad Gallardo
story-9

6 Convertible Top MYTHS Most People Don't Understand!

 Michael S. Palmer
Old Dec 19, 2014 | 07:18 PM
  #2499  
BrianG's Avatar
BrianG
Addict
Rennlist Member

20 Year Member
 
Joined: Jul 2002
Posts: 2,322
Likes: 18
From: Comox, BC
Default

Originally Posted by Tony
I bought a set of those adpaters ages ago..but..i think i have the 2nd? maybe 3rd manifold from Andy. These adapaters actually dont fit my manfifold...i was bummed.. Im still using the old rubber "grommets". One of these days when i need to remove the manifold for what ever reason i will machine the openings just a tad more so they fit..
Tony, mine has the rubber grommets as well. You might be in luck!

87-928-SC.jpg

Brians.jpg
Reply
Old Dec 19, 2014 | 07:23 PM
  #2500  
Tony's Avatar
Tony
Addict
Lifetime Rennlist
Member
20 Year Member
 
Joined: May 2001
Posts: 14,697
Likes: 598
From: Las Vegas
Default

Originally Posted by BrianG
Tony, mine has the rubber grommets as well. You might be in luck!



so they fit yours?? Mine dont fit...and i know that for sure. Perhaps the openings onthe manifold just needed shaving down a tad...i wasnt about to do it while it was all on the car though.
As i look...your manifold is different than mine. Is your water inlet on the top?
Reply
Old Dec 19, 2014 | 08:00 PM
  #2501  
BrianG's Avatar
BrianG
Addict
Rennlist Member

20 Year Member
 
Joined: Jul 2002
Posts: 2,322
Likes: 18
From: Comox, BC
Default

Originally Posted by Tony
so they fit yours?? Mine dont fit...and i know that for sure. Perhaps the openings onthe manifold just needed shaving down a tad...i wasnt about to do it while it was all on the car though.
As i look...your manifold is different than mine. Is your water inlet on the top?
I have pulled a fuel rail, now and the size of the holes in my manifold is ~1.185", so I will turn the outside diameter of this adapter to 1.177 as spec'd in the original Pizza drawings. edited

Yes, one of the intercooler outlets is just in front of the air pump.

Last edited by BrianG; Jan 29, 2015 at 01:40 AM.
Reply
Old Dec 27, 2014 | 07:01 PM
  #2502  
BrianG's Avatar
BrianG
Addict
Rennlist Member

20 Year Member
 
Joined: Jul 2002
Posts: 2,322
Likes: 18
From: Comox, BC
Default Injector bushing prototype.

This is the 3D-printed prototype of the bushing.

These are meant to replace the large rubber grommets in Andy's manifolds and will accept an OEM (Bosch) type injector or the DEKA 4 type that I will be using. [/B]

Still on the printer.

20141227_141548_zpsdc1ab919.jpg


Finished.

20141227_154658_zpsaf825298.jpg

The price that I have received from eMachine is $200.00 per set of 8, priced at one set; ~$100 ea set, for 2 sets. It comes down with each additional set. Anyone interested?
I will provide the eMachine drawings and/or the MasterCam files to anyone that wants those, as well. No Charge

Last edited by BrianG; Jan 26, 2015 at 01:37 AM.
Reply
Old Jan 31, 2015 | 01:32 PM
  #2503  
BrianG's Avatar
BrianG
Addict
Rennlist Member

20 Year Member
 
Joined: Jul 2002
Posts: 2,322
Likes: 18
From: Comox, BC
Default

I am ordering these from eMachine on Monday, February 2, 2015.

If anyone else wants a set, speak up now.
Reply
Old Feb 24, 2015 | 07:15 PM
  #2504  
hans14914's Avatar
hans14914
Rennlist Member
20 Year Member
 
Joined: Aug 2003
Posts: 2,679
Likes: 357
From: Indianapolis
Default

Went back and redesigned the tensioner system again over the weekend. I finally decided not to move the supercharger belt closer to the motor like I originally planned. I really wanted to make a dedicated supercharger belt system, but really didnt like holding it captive behind the alternator and power steering. Plus, it leaves the smog pump drive open for a vacuum pump if it becomes necessary.

Instead, I designed the bracket with a modular lower pulley in mid. I plan on making a billet crank pulley that can use the Metco supercharger drive rings. The 6.55" looks to be the perfect combination with an off-the-shelf 2.75" supercharger pulley and 2.5" alternator pulley.

It needs another evening of tweaking and re-thinking some of the hardware choices for reduced machining costs, but it should be ready to go to the shop before the end of the week.



Reply
Old Feb 24, 2015 | 07:51 PM
  #2505  
Louie928's Avatar
Louie928
Three Wheelin'
 
Joined: Jan 2004
Posts: 1,611
Likes: 13
From: Mosier, Oregon
Default

Originally Posted by hans14914
Went back and redesigned the tensioner system again over the weekend. I finally decided not to move the supercharger belt closer to the motor like I originally planned. I really wanted to make a dedicated supercharger belt system, but really didnt like holding it captive behind the alternator and power steering. Plus, it leaves the smog pump drive open for a vacuum pump if it becomes necessary.

Instead, I designed the bracket with a modular lower pulley in mid. I plan on making a billet crank pulley that can use the Metco supercharger drive rings. The 6.55" looks to be the perfect combination with an off-the-shelf 2.75" supercharger pulley and 2.5" alternator pulley.

It needs another evening of tweaking and re-thinking some of the hardware choices for reduced machining costs, but it should be ready to go to the shop before the end of the week.



Hans,
It's difficult for me to see exactly how the belt path will be. A couple things to consider is that if possible you should have a dedicated belt for the SC. Those air pumps take quite a bit of power especially when accelerating. The tensioner should be on the loose (non drive) side of the belt. Having the alternator on the tight side of the belt puts a large load on the alternator mounting brackets and the bearings. I'm not sure the stock crankshaft multi rib pulley is strong enough to absorb the load of the alternator and SC.
Find a similar SC installation and open the throttle quickly while watching the belt and tensioner.

Louie
Reply



All times are GMT -3. The time now is 12:40 AM.

story-0
Theon Goes Full Carbon Fiber With Stunning New Build

Slideshow: Built around a carbon-bodied 964 and a naturally aspirated 4.0-liter flat-six, this bespoke commission highlights how far the restomod formula has evolved.

By Verdad Gallardo | 2026-06-06 14:41:46


VIEW MORE
story-1
Six Genius Porsche-Themed Gifts That'll Make Any Dad or Grad Smile

Slideshow: Six genius gifts that'll make any Dad smile.

By Joe Kucinski | 2026-06-04 04:58:13


VIEW MORE
story-2
10 Used Porsches Are Selling for Way Too Cheap

Slideshow: These 10 used Porsches offer more driving thrills than their price would suggest.

By Joe Kucinski | 2026-06-03 09:11:13


VIEW MORE
story-3
Tuner Is Converting Porsche 911s Into Shooting Brakes

Slideshow: A Polish Porsche specialist is moving ahead with one of the most unusual 911 conversions in recent memory: a shooting brake version of the 991-generation sports car.

By Verdad Gallardo | 2026-06-01 19:46:47


VIEW MORE
story-4
This Coachbuilt Creation Is A Modern Take on the Legendary Porsche 917

Slideshow: A Porsche Carrera GT has been transformed into a one-off coachbuilt machine that blends analog supercar engineering with styling inspired by the legendary 917 race cars.

By Verdad Gallardo | 2026-06-01 17:06:04


VIEW MORE
story-5
Is This Convertible Cayenne A Steal, Or A Returnless Investment?

Slideshow: A heavily modified Porsche Cayenne convertible with faux wood trim and a long list of flaws recently sold at auction for surprisingly little money.

By Verdad Gallardo | 2026-05-29 18:52:37


VIEW MORE
story-6
10 Best Non-Flat Six Porsches You Can Buy For Under $100K

Slideshow: If you have $100K to spend on a Porsche but want something a little different, these are the 10 best non-flat six Porsches you can buy.

By Joe Kucinski | 2026-05-28 15:36:11


VIEW MORE
story-7
Porsche's Top 5 Most Questionable Naming Decisions

Slideshow: For a company obsessed with engineering precision, Porsche has occasionally named its cars in ways that left even loyal enthusiasts scratching their heads.

By Verdad Gallardo | 2026-05-27 18:43:48


VIEW MORE
story-8
Pogea Racing's 964 Porsche 911 Reimagination Stands Out in a Crowded Field

Slideshow: Pogea Racing's latest Porsche 964 project blends carbon-fiber construction, modern chassis upgrades, and up to 500 horsepower while keeping the air-cooled 911 experience firmly analog.

By Verdad Gallardo | 2026-05-23 10:34:27


VIEW MORE
story-9
6 Convertible Top MYTHS Most People Don't Understand!

Slideshow: dispelling common convertible top myths

By Michael S. Palmer | 2026-04-03 00:00:00


VIEW MORE