Twin Turbo 928 fixed and back out there terrorizing the streets!
06-12-2010, 11:19 AM
#106
Nordschleife Master
Thread Starter
Yes, there's a "turbo timer" in the pump controller that runs the aux electric coolant pump for 5 minutes after the engine shutdown.
06-22-2010, 05:19 PM
#110
Nordschleife Master
Thread Starter
In the midst of all the bull**** I have neglected to mention that the car has now been running for a couple of days. Just a light shakedown, no WOT or boost runs of any kind yet.
06-22-2010, 05:33 PM
#112
Nordschleife Master
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06-22-2010, 05:38 PM
#113
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06-22-2010, 05:45 PM
#115
Supercharged
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So are YOU driving it or is John?
06-22-2010, 05:55 PM
#116
Nordschleife Master
Thread Starter
Figuratively, my role in relation to the twin turbo project so far:
Me at work:
Me on a vacation:
[EDIT: The last photo was firmly outside the boundaries of bad taste]
Last edited by ptuomov; 06-22-2010 at 08:29 PM.
07-03-2010, 12:55 PM
#119
Nordschleife Master
Thread Starter
More news on the turbo front.
The car's been running for a couple of weeks and all known issues are now resolved. John's turbo system itself has no issues but the car itself needed some TLC and upgrades. The most important issues were related to the EZK and Hall sensor. My original EZK is revision .10 and refused to talk to the Sharktuner. I had a spare EZK revision .15 which I bought from Mark Benton for a very good price just in case, and that talks to ST just fine. .10 is really early, something like 11/86 manufacturing date I am guessing. The problem then was that Hall sensor or sensor wiring was busted, but the ST didn't show a fault whereas the EZK sensed it. New sensor in after confirming the output was not right, and that cured the 6 degree retard.
The injectors are larger than what people usually run (60lb/h Siemens Dekas), so it was interesting to see how those worked. With John's base maps, the idle was perfect and the cruise map was almost perfectly spot on. John is fine tuning the cruise map on the car right now. The good thing is that the transient response off boost is indistinguishable from stock.
The car saw about 2 pounds of boost in cruise map / transient testing at most. More boost over the next couple of hours and days.
The car's been running for a couple of weeks and all known issues are now resolved. John's turbo system itself has no issues but the car itself needed some TLC and upgrades. The most important issues were related to the EZK and Hall sensor. My original EZK is revision .10 and refused to talk to the Sharktuner. I had a spare EZK revision .15 which I bought from Mark Benton for a very good price just in case, and that talks to ST just fine. .10 is really early, something like 11/86 manufacturing date I am guessing. The problem then was that Hall sensor or sensor wiring was busted, but the ST didn't show a fault whereas the EZK sensed it. New sensor in after confirming the output was not right, and that cured the 6 degree retard.
The injectors are larger than what people usually run (60lb/h Siemens Dekas), so it was interesting to see how those worked. With John's base maps, the idle was perfect and the cruise map was almost perfectly spot on. John is fine tuning the cruise map on the car right now. The good thing is that the transient response off boost is indistinguishable from stock.
The car saw about 2 pounds of boost in cruise map / transient testing at most. More boost over the next couple of hours and days.
Last edited by ptuomov; 07-04-2010 at 10:18 AM.
07-03-2010, 01:31 PM
#120
Man of many SIGs
Rennlist Member
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So what are your plans for the built engine you have in your avatar? How long will you be running the stock engine? Is the stock engine a test mule to see how high you can turn it up before it gives up?