North American Turbocoupe Organization



five speed is in down on boost
matthew Offline
Junior Member
#1
I just finished the five speed swap the car runs good but now I am only getting 6 pounds of boost before with the auto i would get 10 to 12 any ideas? I checked all the lines and they all look good.
1988 tbird turbo coupe all stock
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tr_guy79 Offline
Senior Member
#2
Sounds like your BCS is not working right. Check you electrical and vacuum connections.

I can't remember if the BCS can trip a code or not. If it can, it may be worth running the codes...
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'87 - Range Roller 4* adv / 50 trim t04e / Ported E6 / Gutted Knifed intake / Stinger 3->2.5" / Adj. Cam Pulley / Warlboro 255

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matthew Offline
Junior Member
#3
Check codes there were none what is the bcs and whats it do
1988 tbird turbo coupe all stock
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gmaibach Offline
Senior Member
#4
its the stock boost controller... get a gillis or a ebay knock off..
1988 Turbo Coupe 5 speed Red with Red cloth interior, K&N cone filter, Ported IHI turbo, ATR Header ported, Manual Boost Controller at 18 psi.

2013 Focus ST 2.0 Turbo, Buschur green filter, OCD Speed axle back exhaust.
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matthew Offline
Junior Member
#5
Yea I think I found the problem I have a home made boost controller on ther now and not using the stock boost controller. I think the previous owner installed a pcv valve where the oil breather should be I was blowing the dipstick up I need to find the oil breather. I think I am getting to much crank pressure from no breather and a bad pcv. Thanks for your help
1988 tbird turbo coupe all stock
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Stinger Offline
Senior Member
#6
Quote:Originally posted by matthew:
Yea I think I found the problem I have a home made boost controller on ther now and not using the stock boost controller. I think the previous owner installed a pcv valve where the oil breather should be I was blowing the dipstick up I need to find the oil breather. I think I am getting to much crank pressure from no breather and a bad pcv. Thanks for your help
While this is something that should be fixed, it has nothing to do with your boost level.
www.Stinger-Performance.com

85 TC
85 SVO
86 SVO
87 Merkur
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Jeff K Offline
Administrator
#7
First step is carefully check all IC and TB hoses for loose clamps, cracks (sometimes hard to find), etc. If you have the stock VAM, check VAM to turbo hose to be sure the internal "spring" is intact and the hose isnt collapsing.
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.
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matthew Offline
Junior Member
#8
check all that still cannot get the boost up funny thing Is it had 10-12 when I drove it in the shop to do the swap. Swapped the five speed and now have 6 the only line removed was the one to the modulator on the auto trans but I plugged the vacuum port. reverse lights are hooked up. and starter wires are jumpered if I remember right there is three wires not hooked up that went to the auto. What I am wondering will the computer defuel in overdrive to protect the tranny if so Is it possible it is sensing this and maybe in a limp mode?? I have made a bleed off boost valve but cannot get over 10 pounds checked the turbo it feels/looks good check all hoses and wires.
1988 tbird turbo coupe all stock
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Stinger Offline
Senior Member
#9
Attach the hose that feeds the boost controller directly to the wastegate actuator (skipping the stock boost controller and your bleed valve). This should result in 8-10psi if everything is functioning properly. If this is the case, unhook the hose to the actuator and plug the hose (leaving nothing on the actuator). Now go for a drive and it should overboost badly (get out of the throttle before it exceeds 15psi or you risk blowing a headgasket or worse). If it passes both of these tests, the problem is in your boost controller.
www.Stinger-Performance.com

85 TC
85 SVO
86 SVO
87 Merkur
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matthew Offline
Junior Member
#10
ok I will try that. Why would it have changed in less than three hours just putting the tranny in??
1988 tbird turbo coupe all stock
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