North American Turbocoupe Organization



87 5 speed, 8psi on premium
DRADIS Offline
Junior Member
#1
It's the age old question that usually has a very simple answer, but i am having a hard time searching the boards because "8 psi" is too short of a search entry. My 87 5 speed is maxing out at 8 psi even with the premium switch engaged. The light is on the switch so i know it's getting power but possibly not functioning... Someone mentioned a way in a previous thread where you can bypass the solenoid or disconnect the sensor to test and make sure the turbo is functioning properly, i was curious if someone could point me to that thread possibly?
1987 Thunderbird Turbo Coupe
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turbospoolin23 Offline
Senior Member
#2
Did you try searching "low boost", "boost problem", "premium switch", and stuff like that?
87 TC 5 spd... 17X9 Cobra R's, .60/.63 SVO T3 Turbo, Large NPR, Manual Boost Controller, AEM Wideband, BPV, K&N Cone, Walbro 255, Kirban AFPR, 3G Alternator Conversion, Short Throw Shifter, Stinger 3" Exhaust, Magnaflow Catalytic Converter & Muffler.
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Pete D Offline
Administrator
#3
If your car is an automatic, It won't make over 10 psi stock setup.
The boost gauge is not known for accuracy. You can disconnect the hose going to the waste gate actuator and give it a quick ride. NOTE there is now nothing limiting boost, it can overboost in a flash. Be prepared to get your foot out of it real quick or you could blow a head gasket or far worse.
Pete Dunham


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DRADIS Offline
Junior Member
#4
Yes and found the post about disconnecting knock sensor. No dice :/ it has no boost til 2500 then 8 hthe rest of the way

It's a 5 speed manual
1987 Thunderbird Turbo Coupe
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DRADIS Offline
Junior Member
#5
double post sorry!
1987 Thunderbird Turbo Coupe
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boosted chicken Offline
Senior Member
#6
The BCS must be bad or stuck. Time for a Gillis!
88 TC#1 Boport stg 3 alum dport head, PT6466, Boport header, CP pistons, Crower rods, MS2xtra
88 TC#2 drag car project(someday)
88 TC#3 parts car (just needed the header panel...bought the whole car, lol)
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DRADIS Offline
Junior Member
#7
good deal or should i get a gillis elsewhere?
http://www.ebay.com/itm/Manual-Boost-Con...ea&vxp=mtr
1987 Thunderbird Turbo Coupe
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boosted chicken Offline
Senior Member
#8
That looks like a new and improved version of the original Gillis valve. I would get that one.
88 TC#1 Boport stg 3 alum dport head, PT6466, Boport header, CP pistons, Crower rods, MS2xtra
88 TC#2 drag car project(someday)
88 TC#3 parts car (just needed the header panel...bought the whole car, lol)
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Pete D Offline
Administrator
#9
It is Rics new version. Check out boostvalve.com
Pete Dunham


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86XR7auto Offline
Moderator
#10
In my opinion...you either have a bad wastegate on the turbo...
Or you cat is plugged...

But either way you need a gillis valve...every turbo car in the world needs one..

Travis
86XR7 in pieces...old time [email protected] http://www.youtube.com/watch?v=kGsz7PdEqTI 88TC stock Red RHSC [email protected], 01 Z71=Nice winter ride, 01 CVLX w/HPP wifes ride!
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