North American Turbocoupe Organization



Vacum line off stock intercooler?
88turbobird5 Offline
Junior Member
#1
Ok so i just installed the stinger fmic and on the stock intercooler where their was a fitting that split off to 2 vacum lines one to the boost control silonode witch i removed a long time ago , so now i just have the single one that runs along the fire wall to the vacum tree then splits off and disapears behind the fender? What do i do with thus line now and where does it go? Ive looked for diagrams online and i have the book but cant seem tp figure it out. Tia
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Mikey97D Offline
Junior Member
#2
(03-25-2019, 12:59 PM)88turbobird5 Wrote: Ok so i just installed the stinger fmic and on the stock intercooler where their was a fitting that split off to 2 vacum lines one to the boost control silonode witch i removed a long time ago , so now i just have the single one that runs along the fire wall to the vacum tree then splits off and disapears behind the fender? What do i do with thus line now and where does it go? Ive looked for diagrams online and i have the book but cant seem tp figure it out. Tia

https://turbotbird.com/old/faqs/Vac_Diagram.htm

I could've sworn I replaced mine and it didn't have a T, but looking at the diagram it shows it going off unmarked.  I will take a look tonight.
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88turbobird5 Offline
Junior Member
#3
Yea thats the same diagram i was looking at and with the new fmic set up idk what to do with it i bypassed the boost control silonode a long time ago and just ran that one on the nipple on the intercooler and dont know what to do with it now
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Mikey97D Offline
Junior Member
#4
Sorry, I didn't get online last night. On my car it goes from the intercooler directly into the vacuum tree for that line without the tee running to the fender.
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Jeff K Offline
Administrator
#5
That T fitting with the 2 vac lines on the stock IC is an aspirator that generates vacuum for the cruise control servo when the engine is under boost. Without it, the cruise control wont work when the intake is pressurized, such as when climbing steeper hills, etc.
Jeff Korn

88 Turbo Coupe: Intake and exhaust mods, T3 turbo at 24 psi, forced air IC, water injection, BPV, Ranger cam, subframes, etc., etc.
86 Tbird 5.0 (original owner): intake, exhaust, valvetrain mods, 100 HP N2O, ignition, gears, suspension, etc., etc.
05 Taurus SEL Duratec daily driver
04 Taurus Duratec (wifes car)
02 Pontiac Grand Prix GT
95 Taurus GL Vulcan winter beater
67 Honda 450 Super Sport - completely customized
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BJL Offline
Moderator
#6
if you don't use the t fitting like jeff says the cruise will not work under boost. i know this from direct experience in 2016... no boost with cruise isnt fun.
Brian J Larkin
88TC 320k miles
T3, FMIC ,3in stinger exhaust, gillis,
255 walbro, afpr, 5spd swap,spec clutch, sn95 5 lug,.
89 Cougar XR7 3.8SC Auto
95 Ranger Splash 3.0 auto
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88turbobird5 Offline
Junior Member
#7
Thank you jeff and bjl , so what i am understanding is that i can just conect the vacum line that runs from the fender straight to the vacum tree and elimate the rest? Thank you for the response
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Jeff K Offline
Administrator
#8
Correct...... you will not have cruise control when under boost, PLUS positive pressure getting to the CC servo will blow out the diaphragm in the CC servo.

There are 2 check valves in the lines from the vac tree and the aspirator on the IC so the CC servo will see the "best" vacuum from either source, and the check valves will also prevent boost pressure from the vac tree from getting to the CC servo.
Jeff Korn

88 Turbo Coupe: Intake and exhaust mods, T3 turbo at 24 psi, forced air IC, water injection, BPV, Ranger cam, subframes, etc., etc.
86 Tbird 5.0 (original owner): intake, exhaust, valvetrain mods, 100 HP N2O, ignition, gears, suspension, etc., etc.
05 Taurus SEL Duratec daily driver
04 Taurus Duratec (wifes car)
02 Pontiac Grand Prix GT
95 Taurus GL Vulcan winter beater
67 Honda 450 Super Sport - completely customized
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88turbobird5 Offline
Junior Member
#9
So i have to make sure one of those check vavles are installed after the vacum tree to the cc servo?
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Jeff K Offline
Administrator
#10
Why not just install the aspirator in the tube from the turbo to whatever IC you use and leave the system as is.
Jeff Korn

88 Turbo Coupe: Intake and exhaust mods, T3 turbo at 24 psi, forced air IC, water injection, BPV, Ranger cam, subframes, etc., etc.
86 Tbird 5.0 (original owner): intake, exhaust, valvetrain mods, 100 HP N2O, ignition, gears, suspension, etc., etc.
05 Taurus SEL Duratec daily driver
04 Taurus Duratec (wifes car)
02 Pontiac Grand Prix GT
95 Taurus GL Vulcan winter beater
67 Honda 450 Super Sport - completely customized
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