Twin Turbo 928 fixed and back out there terrorizing the streets!
#1516
Instructor
for those applications that are limited by turbo frame size (not cost) yet want the highest possible mass trough-put and efficiency per turbine wheel and compressor wheel size; these are the guys i recommend:
http://www.extreme-tuners.com
http://www.extreme-tuners.com/catnav...&id=285#anchor
http://www.extreme-tuners.com
http://www.extreme-tuners.com/catnav...&id=285#anchor
#1517
Nordschleife Master
Thread Starter
for those applications that are limited by turbo frame size (not cost) yet want the highest possible mass trough-put and efficiency per turbine wheel and compressor wheel size; these are the guys i recommend: http://www.extreme-tuners.com/catnav...&id=285#anchor
#1518
Racer
Join Date: Jan 2009
Location: Adelaide South Australia'79 5spd twin turbo
Posts: 326
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Right...so this is an entirely open ended pursuit of horsepower? As long as the long motor consists of factory components. No stopping when you reach a 4 digit output ?
#1519
Rennlist Member
for those applications that are limited by turbo frame size (not cost) yet want the highest possible mass trough-put and efficiency per turbine wheel and compressor wheel size; these are the guys i recommend:
http://www.extreme-tuners.com
http://www.extreme-tuners.com/catnav...&id=285#anchor
http://www.extreme-tuners.com
http://www.extreme-tuners.com/catnav...&id=285#anchor
#1522
Addict
Lifetime Rennlist
Member
Lifetime Rennlist
Member
#1524
Nordschleife Master
Thread Starter
And, yes,...
We needz more thermocouples.
These are now bonded to plugs that can be screwed to the existing ports.
These are now bonded to plugs that can be screwed to the existing ports.
Last edited by ptuomov; 02-21-2017 at 07:16 AM.
#1525
Instructor
Ptuomov: to quote your post #1517:
"And the latest top of the line Garrett wheels are in my opinion pretty damn good"
https://m.facebook.com/story.php?sto...74241639280638
These guys agree with you 100%
per comment section:
"Garrett turbos are the highest quality off the shelf turbos can buy"
"And the latest top of the line Garrett wheels are in my opinion pretty damn good"
https://m.facebook.com/story.php?sto...74241639280638
These guys agree with you 100%
per comment section:
"Garrett turbos are the highest quality off the shelf turbos can buy"
#1526
Rainman
Rennlist Member
Rennlist Member
Have read a lot of this thread but haven't seen mention (or just missed it) of whether you are using stock connecting rods in this beast?
This is a standard S4 engine otherwise right?
This is a standard S4 engine otherwise right?
#1527
Nordschleife Master
Thread Starter
In my opinion, those rods and the whole rotating assembly can take very high compression loads, much higher than most aftermarket "H-beam" rods. High rpms, not so much... The stock pistons with the machined dish weight about 610g and the wrist pins about 180g each, making the total weight almost 800g. That 800g slug is laughing at the compression pressures that we've shown it, but the rod would be "huffing and puffing" at the stock GT redline.
It's an engine that has mostly stock components, but many of them are thoughtfully modified to work together and everything is assembled together very carefully. It's got street cams that however are a little bigger than the GT cams, and lower static compression for forced induction, for example. I think those Elgin 65-6 cams are still the best street cam profiles ever made for the 928 S4/GT/GTS. Everyone who's ever installed them and then sorted out the tune has been real happy with the result.
Last edited by ptuomov; 02-23-2017 at 08:54 AM.
#1529
Nordschleife Master
Thread Starter
It does. It's great that they at JDS are providing us this interface to modify the LH and EZ-K parameters.
As we're going where not many (any?) have gone before, there are always new things to solve. Currently, John's documenting what looks like a minor bug in the ST's idle warm-up algorithm for very large injectors. The car runs fine, but we're trying to get all the ducks in the row perfectly.
I think that anyone who understands these turbos knows that Garrett design engineers (not talking about the tech support here) are top notch and have recently been spending time coming up with new and even better wheels for various applications.
The same builder built a similarly very "stock-like" and conservative engine for George Suennen that has held up very well under extended high-load and high-boost runs with a supercharger when more "exotically" modified engines are going !kabloom! left and right.
This blue engine, for example, gives only 2 CFM of blow-by at 5000 rpm, 10 psi of boost, and over 450 ft-lb of torque. By my logic, this measurement tells us that a lot went right and very little went wrong when the engine was built...
As we're going where not many (any?) have gone before, there are always new things to solve. Currently, John's documenting what looks like a minor bug in the ST's idle warm-up algorithm for very large injectors. The car runs fine, but we're trying to get all the ducks in the row perfectly.
Ptuomov: to quote your post #1517:
"And the latest top of the line Garrett wheels are in my opinion pretty damn good"
https://m.facebook.com/story.php?sto...74241639280638
These guys agree with you 100% per comment section:
"Garrett turbos are the highest quality off the shelf turbos can buy"
"And the latest top of the line Garrett wheels are in my opinion pretty damn good"
https://m.facebook.com/story.php?sto...74241639280638
These guys agree with you 100% per comment section:
"Garrett turbos are the highest quality off the shelf turbos can buy"
This blue engine, for example, gives only 2 CFM of blow-by at 5000 rpm, 10 psi of boost, and over 450 ft-lb of torque. By my logic, this measurement tells us that a lot went right and very little went wrong when the engine was built...
#1530
Rainman
Rennlist Member
Rennlist Member
Stock PPF rods, not the later cast ones, in all their about 850g glory!
In my opinion, those rods and the whole rotating assembly can take very high compression loads, much higher than most aftermarket "H-beam" rods. High rpms, not so much... The stock pistons with the machined dish weight about 610g and the wrist pins about 180g each, making the total weight almost 800g. That 800g slug is laughing at the compression pressures that we've shown it, but the rod would be "huffing and puffing" at the stock GT redline.
In my opinion, those rods and the whole rotating assembly can take very high compression loads, much higher than most aftermarket "H-beam" rods. High rpms, not so much... The stock pistons with the machined dish weight about 610g and the wrist pins about 180g each, making the total weight almost 800g. That 800g slug is laughing at the compression pressures that we've shown it, but the rod would be "huffing and puffing" at the stock GT redline.
OR...
here is 84+ 944 cast rod (top) compared to 82-83 944 "sintered" PPF rod (bottom)...is yours like this one?