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1989 Euro Turbo Vacuum routing plan

Dears:

Searched to no avail, the exact vacuum routing diagram of '89 Euro 930 Turbo. Leads greatly appreciated.
Old 09-13-2017, 11:46 PM
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Is this what you are looking for? This for an '86 930, but probably the same as '89.

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Bill
1988 Carrera - 3.6 engine (with ITBs, COPs, MS3X) and a whole set of turbo body panels waiting in the attic.
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Memories: '68 912, '72 911T, '80 911SC, '84 911, '85 930, '86 930, '87 911
Old 09-14-2017, 06:13 AM
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Thanks Billjam! Is this for Euro spec. without Catalyst Converter? And what does #37 Solenoid Valve do?
Old 09-14-2017, 08:02 AM
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This is for US spec, I don't know if Euro is the same.
Cat is item 29.
I don't know the purpose of #37, but I am sure someone will chime in with the answer.
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Bill
1988 Carrera - 3.6 engine (with ITBs, COPs, MS3X) and a whole set of turbo body panels waiting in the attic.
Day job ... www.sspowdercoat.com.au
Memories: '68 912, '72 911T, '80 911SC, '84 911, '85 930, '86 930, '87 911
Old 09-14-2017, 03:20 PM
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Looks like #37 ( on the bottom) is a solenoid for the smog system. Looks like it controls the check valves for the smog pump. Not sure what the solenoid near the distributed does.


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1989 Slate Grey 930...still tinkering
Old 09-14-2017, 04:21 PM
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No.
The vacuum solenoid-valve (37 in the diagram, aka Change Over Valve aka thermo time switch) is plumbed thusly:
-Nipple underneath the electrical connector to the throttle body
-Nipple opposite the electrical connector vents to atmosphere
-Nipple on top at 90 degrees to the distributor

Blue RHS line on the distro pot is the Retard Line, and goes to the vacuum solenoid Thermo Time Switch (TTS)/change over valve mounted on the LHS of the BOV housing, and thence to the front port on the throttle body which is ABOVE the butterfly valve. This one has vacuum on it at idle. When the engine is at temperature, boost pressure retards the timing to avoid detonation. The TTS disables vacuum retard during warm up which raises idle speed and is part of the cold start routine that lasts about a minute.

I've read this many times btw, and it makes me realize this emissions control/cold start aid is potentially dangerous as it prevents ignition retard on boost when the engine is not up to temp. Admittedly, you'd probably have to hit boost leaving your driveway as it come up to temp real quick but still....
Old 09-15-2017, 06:36 AM
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To Flightlead 404:

This is extremely clear!! Thank you!! Is there a diagram of the said part and beyond, to include the entire vacuum connections? Bought a ridiculously re-routed '89 Euro (most likely not wanting to spend the necessary $ to fix what ever went wrong), and hoping to bring back to stock. Frustrating.
Old 09-15-2017, 08:29 AM
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The one bill posted is the best one for a stock setup, not sure what if any diffs there are between 86 and 89, not much probably.

Personally I'd get rid of a few items like all the air injection crap, pump, spider, associated valves etc. I'd get rid of the thermovalve in the red (advance) line side as well.
Old 09-18-2017, 07:35 AM
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