Porsche Jeopardy Questions..

[Luislang]

I need your help with the following items, please. Some background: I purchased a 3.3 turbo motor off Craigslist that had ben disassembled in the late 1990's and left in boxes. I've been rebuilding the motor over the past 18 months and now at the point where I am working to connect a 964 loom to the engine, and to the vehicle's 1976 chassis wiring.
There are various wires and ports I wish to identify and connect correctly. The photographs below show the mystery items corresponding to the questions below.
Thank you in advance for your help!
1. Fuel supply? (looks like custom AN fitting)
2. Where does the top of BOV connect to?
3. Fuel return connection?
4. There is a steel bracket mounted on the intake manifold? What for?
5. Non-return valve required? Where to find?
6 What is the purpose of the coil springs?
7 Why do some have them and some not?
8 What does this sender do? What does it connect to?
9 The previous owner had blocked of a number of ports. I wish to reconnect them. Where does this port connect to?
10 What is the purpose of this sender? What does it connect to?
11 There is an open port on breather cover. What is supposed to go in there?
12 Better view of sender 10.
13 Where do these wires connect? ( there is a better view in another picture)
14 What does this sender do? What does it connect to? What color wire?
15 Where does the green/yellow wire go?
16 On the plastic turbo intake, what connects to the blocked off port?
17 There is another post on the opposite side. What connects to that port?
18 Apertures in the engine tin. What goes thru there?
19 What connect here?
20 How do I differentiate between the two multiplugs?
21 Which part of the circuit do they serve?
22 Where does the blocked-off port at the back of the throttle body connect to?
23 Where does this blocked-off port connect to?
24 There is a thin hose with two outlets connected to the back of the throttle body. What and where do the two end connect to?
25 Where does the outlet form the BOV connect?

[flightlead404]

Many if not all of these can be answered by going to the PET or the workshop manual for the appropriate model year.

1. Looks like an -6 AN to me

2. With a "long neck" intercooler this connects to the back of the intercooler, or else somewhere into the intake manifold

3. Hard to tell, that may have gone to a lambda frequency valve

4. I think that was for mounting some sort of emissions gear

5. That's the other side of the WUR and goes back to the fuel head and yes needs to be connected. Uses a banjo bolt. Check the PET or workshop manual for the part.

6,7. IDK. JFairman I think rebuilt his recently and can answer but they should all be the same

8. Can't tell, don't have on on my 86. is it factory? added by PO?

9. Can't tell what it is

10, 12. Temp switch opens at ~15C, and connects to the Oxygen Sensor control unit via a Green/Yellow wire and starts the O2 sensor control. It is connected to the larger under-seat box at Pin 11, wit's purpose is to initiate closed loop control at near idle with the frequency control valve on 1986 to 1988 US 930's. You don't need it.

11. Thermovalve. Opens or closes a vacuum line between manifold and distributor to prevent retard during idle and heat up the catalytic converter. You don't need it. Block it.

13, 15. Green/white to rearmost temp switch on breather cover. The other to the oil pressure switch on top of where the turbo oil line picks up.

14. oil pressure switch, see 13

16, 17. IDK I don't have that. Can't really see 17.

18. Wastegate control line, wastegate vent line, lead to O2 sensor

19. Hard to tell, but it is likely some sort of vacuum valve or pierburg type switch. May be unneeded.

20, 21. Sorry, IDK.

22. There are three vacuum connections on the front of the throttle body (rear when looking from the rear of the car, front with respect to vehicle motion). There are two lower down that come of the same port and go off to the left and right. Passenger side of that goes to the WUR, the other side goes to top of BOV. There is also one slightly higher up that comes off at an angle towards passenger side and does to the outside port on the vacuum servo on the distributor (boost retard I think).

23. Goes to the center port of the vacuum limiter.

24. See 22.

Do I win a new car, Alex?

[TurboKraft]

You know we're about an hour away from you, right?
Come on by, get all this answered, take pictures of what all that should look like.

[Mick_D]

I hate pop quizzes.

[Jeff NJ]

Originally Posted by flightlead404

Do I win a new car, Alex?

Sorry, none of your answers were in the form of a question, so you get zero points, and you do not get a lovely parting gift either.

[Rawknees'Turbo]

Originally Posted by flightlead404

Many if not all of these can be answered by going to the PET or the workshop manual for the appropriate model year.



2. With a "long neck" intercooler this connects to the back of the intercooler, or else somewhere into the intake manifold

Actually, number 2 connects to a vac nip on the throttle body (below throttle plate) so that the BOV opens under the vaccuum pressure created by sudden closed throttle.

Yer welcome, and I get the new car, bisch!!!

[icemann427]

Originally Posted by TurboKraft

You know we're about an hour away from you, right?
Come on by, get all this answered, take pictures of what all that should look like.

Ding Ding Ding

Winner winner, chicken dinner...

[kevin930t]

Originally Posted by Luislang

I need your help with the following items, please. Some background: I purchased a 3.3 turbo motor off Craigslist that had ben disassembled in the late 1990's and left in boxes. I've been rebuilding the motor over the past 18 months and now at the point where I am working to connect a 964 loom to the engine, and to the vehicle's 1976 chassis wiring.
There are various wires and ports I wish to identify and connect correctly. The photographs below show the mystery items corresponding to the questions below.
Thank you in advance for your help!
1. Fuel supply? (looks like custom AN fitting)
2. Where does the top of BOV connect to?
3. Fuel return connection?
4. There is a steel bracket mounted on the intake manifold? What for?
5. Non-return valve required? Where to find?
6 What is the purpose of the coil springs?
7 Why do some have them and some not?
8 What does this sender do? What does it connect to?
9 The previous owner had blocked of a number of ports. I wish to reconnect them. Where does this port connect to?
10 What is the purpose of this sender? What does it connect to?
11 There is an open port on breather cover. What is supposed to go in there?
12 Better view of sender 10.
13 Where do these wires connect? ( there is a better view in another picture)
14 What does this sender do? What does it connect to? What color wire?
15 Where does the green/yellow wire go?
16 On the plastic turbo intake, what connects to the blocked off port?
17 There is another post on the opposite side. What connects to that port?
18 Apertures in the engine tin. What goes thru there?
19 What connect here?
20 How do I differentiate between the two multiplugs?
21 Which part of the circuit do they serve?
22 Where does the blocked-off port at the back of the throttle body connect to?
23 Where does this blocked-off port connect to?
24 There is a thin hose with two outlets connected to the back of the throttle body. What and where do the two end connect to?
25 Where does the outlet form the BOV connect?

I would take T/K up on that offer,although there are alot of guys with the answers here,but since chris is a couple miles as a crows fly i would crab a camera and a pad of paper.Thatsvone hell of a xmas gift...

Originally Posted by TurboKraft

You know we're about an hour away from you, right?
Come on by, get all this answered, take pictures of what all that should look like.

Sent from my SM-N910T using Tapatalk

[flat6pilot]

Not that I know anything about the 930 motor, but I'll be in Payson tomorrow visiting my girlfriends' friends and family.

Maybe I'll pop into Turbocraft and say Hi to Chris. Any cool projects going on, Chris?

[flightlead404]

Originally Posted by Rawknees'Turbo

Actually, number 2 connects to a vac nip on the throttle body (below throttle plate) so that the BOV opens under the vaccuum pressure created by sudden closed throttle.

Yer welcome, and I get the new car, bisch!!!

Right, I thought the arrow was pointing to the large side port. #25 goes to the intercooler or into the intake somewhere

[Costa P]

It is similar to OCD.....except that the letters need to be in alphabetical order!

Originally Posted by Luislang

I need your help with the following items, please.
1. Fuel supply? (looks like custom AN fitting)
2. Where does the top of BOV connect to?

[Costa P]

Originally Posted by Luislang

I need your help with the following items, please.
3. Fuel return connection?
4. There is a steel bracket mounted on the intake manifold? What for?
5. Non-return valve required? Where to find?

Originally Posted by Luislang

I need your help with the following items, please.
6 What is the purpose of the coil springs?
7 Why do some have them and some not?

Originally Posted by Luislang

I need your help with the following items, please.
8 What does this sender do? What does it connect to?
9 The previous owner had blocked of a number of ports. I wish to reconnect them. Where does this port connect to?
10 What is the purpose of this sender? What does it connect to?

Originally Posted by Luislang

I need your help with the following items, please.
11 There is an open port on breather cover. What is supposed to go in there?
12 Better view of sender 10.
13 Where do these wires connect? ( there is a better view in another picture)
14 What does this sender do? What does it connect to? What color wire?
15 Where does the green/yellow wire go?

Originally Posted by Luislang

I need your help with the following items, please.
16 On the plastic turbo intake, what connects to the blocked off port?
17 There is another post on the opposite side. What connects to that port?
18 Apertures in the engine tin. What goes thru there?

Originally Posted by Luislang

I need your help with the following items, please.
19 What connect here?
20 How do I differentiate between the two multiplugs?
21 Which part of the circuit do they serve?

Originally Posted by Luislang

I need your help with the following items, please.
22 Where does the blocked-off port at the back of the throttle body connect to?

Originally Posted by Luislang

I need your help with the following items, please.
23 Where does this blocked-off port connect to?

Originally Posted by Luislang

I need your help with the following items, please.
24 There is a thin hose with two outlets connected to the back of the throttle body. What and where do the two end connect to?
25 Where does the outlet form the BOV connect?

25 Should connect somewhere after the intercooler but before the throttle, the boost is recirculated back to the inlet of the turbo compressor......when the throttle is closed between gear changes. The recirculation valve is actuated by the vacuum built up after the throttle (connected to point 2 in your previous pic)

+1 to visit TK

In the mean time, I am sure you will get valuable feedback from this forum

[Costa P]

Originally Posted by Costa P

25 Should connect somewhere after the intercooler but before the throttle, the boost is recirculated back to the inlet of the turbo compressor......when the throttle is closed between gear changes. The recirculation valve is actuated by the vacuum built up after the throttle (connected to point 2 in your previous pic)

Nice diagram from another pelican thread:
Inlet Overrun Valve Modification? (BOV, lag)

[Luislang]

Wow! Thank you everyone for your generous help! I did not expect to get most of the giants on this forum to respond. Chris, I will definitely take you up on your generous offer to come visit the Taj Mahal of air-cooled engineering.