North American Turbocoupe Organization



vacum line puzzle
83zombi Offline
Senior Member
#1
I think my vacum lines are assembled correctly because there is no other way they could fit. However I just noticed there is a line going from the turbo outlet to the tubo inlet, unmetered. What would be the purpose of running vacum line from the outlet to the inlet? This was originally sold in Denver, high alttitude mods from the factory such as a MAP sensor which was an air density device at the time.
83 dead bird, in pieces however I'm reading from the book of the dead, should be running soon.
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CougarXR7 Offline
Member
#2
Has the factory boost control solenoid been bypassed? If so, it could be from that.
That's how mine is, anyway...
1986 Mercury Cougar XR-7
5-Speed - Leather - Dual Manual Seats - Vent Windows - Smokin' T3
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Pete D Offline
Administrator
#3
Is the port part of a 2 port fitting on the turbo outlet?

If so, where does the line on the other port go?

Does the car have speed control?
Pete Dunham


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83zombi Offline
Senior Member
#4
Yes, it is a two port fitting. The other line has a check valve on it and goes into the dash. Yes the car has speed control. Before I put the gillis valve on there was one line going from the side of the turbo to the waste gate. Now it passes thru the gillis valve.
83 dead bird, in pieces however I'm reading from the book of the dead, should be running soon.
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Pete D Offline
Administrator
#5
My guess is the lines are related to the auxillary vacuum for the speed control. There is vacuum created in the long lone when boost blows through the small line that goes to the turbo inlet.
Pete Dunham


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83zombi Offline
Senior Member
#6
Pete that is the only thing I could think of because of the check valve in the line going to the dash. Seems like a round about way to create a vacum. I wonder if it was unique to the high alttitude deleveries because this vacum system is not listed in any manuals. I wonder if there is a better way to run the speed control?
83 dead bird, in pieces however I'm reading from the book of the dead, should be running soon.
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Pete D Offline
Administrator
#7
I know this same setup is used on the 87-88s but the 2 port fitting is on the intercooler instead of the turbo outlet. I'm pretty sure it is used on all year TCs.
The checkvalve is to keep boost (in the vacuum tree) out of the speed control equipment (ampliphier?) in the inner fender well, driver's side. I have heard that boost will destroy it.

Also remember this is only used to provide additional vacuum when the engine is in boost. The rest of the time the Speed control gets vacuum from the normal vacuum tree supply.

The vacuum is created by venturi effect of boost through the port toward the turbo inlet, pulling the air out of the hose back to the SC amplifier
Pete Dunham


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83zombi Offline
Senior Member
#8
I can see it happening but I wonder if all manafacturers of tubo cars do it this way? Would an air box work just as well? Did ford come up with this or did they borrow from somebody like bosh?
83 dead bird, in pieces however I'm reading from the book of the dead, should be running soon.
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