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

Twin Turbo 928 fixed and back out there terrorizing the streets!

Thread Tools
 
Search this Thread
 
Old 11-02-2016, 07:11 PM
  #1351  
ptuomov
Nordschleife Master
Thread Starter
 
ptuomov's Avatar
 
Join Date: Jan 2009
Location: MA
Posts: 5,610
Received 81 Likes on 64 Posts
Default I didn't know that...

Originally Posted by Rob Edwards
8 temp, 5 pressure and 1 delta-P transducer? Whole lotta data, wow. The pressure drop across the intercoolers is assumed to be the same side-to-side? Why not delta-P and the two temps on the same intercooler?

Chris approves, but:

I didn't know that Christopher Walken was a "yes, but..." guy. ;-)

The system is pretty symmetric and the symmetry can be verified from the speed sensors. The bung locations are pretty symmetric, too, which makes these pick-up locations convenient. There's a bung in about the same spot upstream and downstream of the intercooler on both sides.

These sensors in the schematic are for dyno only, st2 and EB2 have their own sensors. The dyno sensors are in locations in which sensors might in regular road use have "issues". The permanently mounted sensors are in locations that should be reasonably safe for the sensors.

Last edited by ptuomov; 11-03-2016 at 07:42 AM.
Old 11-04-2016, 09:30 AM
  #1352  
ptuomov
Nordschleife Master
Thread Starter
 
ptuomov's Avatar
 
Join Date: Jan 2009
Location: MA
Posts: 5,610
Received 81 Likes on 64 Posts
Default Remote turbo oiling

This might be useful for people who frequently swap turbos or other remote components that require controlled oil pressure. No need or room for it in my car, because the restrictor calibration works fine and did I say there's no room.

An obligatory photo of me working hard remotely included. Telecommuting to work rulz!









God, does this iPhone interface suck hairy *******...
Old 11-04-2016, 05:17 PM
  #1353  
ptuomov
Nordschleife Master
Thread Starter
 
ptuomov's Avatar
 
Join Date: Jan 2009
Location: MA
Posts: 5,610
Received 81 Likes on 64 Posts
Default Coolant lines

This is how John designed the turbo coolant and other hardlines. He first mocked them up from soft copper line and the hardlines were then fabricated based on these models.






Old 11-04-2016, 06:32 PM
  #1354  
V2Rocket
Rainman
Rennlist Member
 
V2Rocket's Avatar
 
Join Date: Jan 2007
Location: Nashville, TN
Posts: 45,540
Received 646 Likes on 500 Posts
Default

read a lot of your posts over the years, you sure know a lot of stuff for being fuzzy and blue...





Originally Posted by ptuomov
An obligatory photo of me working hard remotely included. Telecommuting to work rulz!
Old 11-04-2016, 07:47 PM
  #1355  
ptuomov
Nordschleife Master
Thread Starter
 
ptuomov's Avatar
 
Join Date: Jan 2009
Location: MA
Posts: 5,610
Received 81 Likes on 64 Posts
Default

Originally Posted by V2Rocket
read a lot of your posts over the years, you sure know a lot of stuff for being fuzzy and blue...
Experiment Number 626 has many talents.
Old 11-06-2016, 03:59 AM
  #1356  
sendarius
Pro
 
sendarius's Avatar
 
Join Date: Mar 2004
Location: Perth, Western Australia
Posts: 715
Likes: 0
Received 14 Likes on 13 Posts
Default

626? That can't be right - that's a Mazda!



And yes, I do know the Lilo & Stitch reference, so don't bother explaining.

Last edited by sendarius; 11-06-2016 at 04:00 AM. Reason: Expanded
Old 11-06-2016, 11:22 AM
  #1357  
ptuomov
Nordschleife Master
Thread Starter
 
ptuomov's Avatar
 
Join Date: Jan 2009
Location: MA
Posts: 5,610
Received 81 Likes on 64 Posts
Default Space

A quick word on that AOS hardline. Since the lines potentially flows oil downwards and gas both upwards and downwards, it has to have a relatively large diameter, much like the block oil drains. The large diameter and the requirement for a relatively straight path down make running the drain line a space challenge. The solution is to run a rigid hardline from the turbo oil sump to above the exhaust manifold level and then a rubber hose above the exhaust manifold level. This way, the hardline will move with the engine on the motor mounts where the space is tight and the the rubber line section will give the compliance for the AOS to be loosely anchored to the chassis.
Old 11-07-2016, 10:27 AM
  #1358  
Chris Lockhart
Rennlist Member
 
Chris Lockhart's Avatar
 
Join Date: May 2001
Location: Taylors, S.C.
Posts: 2,150
Received 10 Likes on 7 Posts
Default

Brilliant method on fabbing the lines. I've never thought about that. Cool. :-)
Old 11-17-2016, 02:26 AM
  #1359  
ptuomov
Nordschleife Master
Thread Starter
 
ptuomov's Avatar
 
Join Date: Jan 2009
Location: MA
Posts: 5,610
Received 81 Likes on 64 Posts
Default Inlets open wide

Greetings from South Africa! Here's a visual of how the filter will integrate into those large inlet pipes. There will be two openings cut to the filter element and outlets attached to them.



Old 11-20-2016, 07:55 PM
  #1360  
ptuomov
Nordschleife Master
Thread Starter
 
ptuomov's Avatar
 
Join Date: Jan 2009
Location: MA
Posts: 5,610
Received 81 Likes on 64 Posts
Default As big as can fit:

The compressor inlets are now true 3.5" OD stainless pipe all the way to the silicone inlet boots. A challenge to fit them, but John was able to put together the puzzle:

Old 11-21-2016, 10:24 AM
  #1361  
Chris Lockhart
Rennlist Member
 
Chris Lockhart's Avatar
 
Join Date: May 2001
Location: Taylors, S.C.
Posts: 2,150
Received 10 Likes on 7 Posts
Default

Damn you are using every possible square centimeter!!!
Old 11-25-2016, 03:40 PM
  #1362  
ptuomov
Nordschleife Master
Thread Starter
 
ptuomov's Avatar
 
Join Date: Jan 2009
Location: MA
Posts: 5,610
Received 81 Likes on 64 Posts
Default Fuel system testing.

While I'm having a rough month traveling, John's testing the fuel system. Everything seems to pressurize correctly, no smell, no leaks, and pressure holds well downstream of the check valve.



Personally, in November I've done two World Series games in Chicago, long weekend in Disney World, some private clubs in London, a week in Cape Town, and now Thanksgiving in St. John. This was supposed to be my vacation month, and I feel like I need a vacation when I get back from vacation! How do the Europeans do this every year with their seven week holidays???
Old 11-25-2016, 07:30 PM
  #1363  
Jadz928
Rennlist Member
 
Jadz928's Avatar
 
Join Date: May 2003
Location: Frankenmuth, Michigan
Posts: 8,690
Received 128 Likes on 78 Posts
Default

Old 11-25-2016, 09:02 PM
  #1364  
rnixon
Burning Brakes
 
rnixon's Avatar
 
Join Date: Aug 2012
Location: Los Altos, CA
Posts: 757
Received 1 Like on 1 Post
Default

Originally Posted by Chris Lockhart
Damn you are using every possible square centimeter!!!
And on top of that, a whole other dimension!
Old 12-01-2016, 05:04 PM
  #1365  
ptuomov
Nordschleife Master
Thread Starter
 
ptuomov's Avatar
 
Join Date: Jan 2009
Location: MA
Posts: 5,610
Received 81 Likes on 64 Posts
Default 75 gallons of race fuel for testing

The car will be tuned for pump gas but some of the dunno testing steps will require higher octane fuel:



Quick Reply: Twin Turbo 928 fixed and back out there terrorizing the streets!



All times are GMT -3. The time now is 06:01 AM.