North American Turbocoupe Organization



Got the Gillis Valve on tonight, boost wont hold steady, is the turbo too small?
Rodger Offline
Member
#11
When I initially installed the Gillis valve it spiked similar to what you are describing. (Shot up to 17-18 then dropped to 15.) After consulting Ric Gillis, I took the valve apart, cleaned it with a solvent, reassembed and installed it again. Spiking was gone which means it would boost to about 15 and then hold it. Maybe a PSI or so higher in the upper gears. My valve is almost turned in completly.
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Speeds8erM-1 Offline
Member
#12
He told me to take apart and clean it too, I just havent. Could my stock exhaust be the problem? It's broke, so I can go "disconnect" of the mufflers right now and see if it runs any better. [Image: smile.gif] Could it be choking it?
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Speeds8erM-1 Offline
Member
#13
Mine will hold 15 PSI, it just jumps up higher and stay there for a second, then falls down to 15 PSI. I want to run 17 PSI constant. Yes, I need a real boost gauge. [Image: smile.gif] It almost feels like it pulls harder at part throttle than WOT.
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Jeff K Offline
Administrator
#14
Take it apart and clean it!!! takes about 2 minutes to clean it out. Also be sure the bleed hole isnt obstructed>

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Jeff Korn

88 Turbo Coupe: Intake and exhaust mods, T3 turbo at 20 psi, forced air intercooler, water injection, bypass valve, Ranger roller cam, subframes, etc., etc.. // 86 Tbird 5.0 (original owner): intake, exhaust, valvetrain mods, 100 HP nitrous, ignition, gears, suspension, etc., etc.... // 91 Escort: Bone stock winter car // 02 Taurus Vulcan(wifes car)
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.
11 Crown Vic Interceptor
14 Toyota Camry (wifes car)
95 Taurus GL Vulcan winter beater
67 Honda 450 Super Sport - completely customized
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jabobia Offline
Member
#15
brake cleaner works wonders...i took mine apart, ground the seat in the nipple a little, cleaned it out, and its back in service...pulling 19-20psi every time

-james

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87 TurboCoupe - 5spd
87 Thunderbird TurboCoupe - 2.3T, T5, 3.55L - K&N, 18psi - 16.14@88mph(2.37 60')
88 Thunderbird Sport - 5.0SO, AOD, 2.73L - 16.77@82mph(2.39 60')
www.cardomain.com/id/jabobia
jabobia.com
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Speeds8erM-1 Offline
Member
#16
Well, now I have a boost leak or vaccum leak, I guess one of my intercooler hoses split or came loose. I will have to check tomarrow.
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scratchy_2.3 Offline
Junior Member
#17
I had a pvc coupling split on me the other day - it sounded sorta cool acually

"pshhhhhhhhhhhhhhhhh..."

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1988 TC

Mods

Weight reduction (rust)-
Rear Slicks (bald tires)-
Flux Capasitor from '85- DeLorianBig Grin
Cool-aid Induction
1988 TC

Mods

Weight reduction (rust)-
Rear Slicks (bald tires)-
Flux Capasitor from '85- DeLorianBig Grin
Cool-aid Induction
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Resurectedbird Offline
Senior Member
#18
if your exhaust is choking it, it could affect boost. if your cat is plugged or pipe is too small, boost can go up until it gets to a point where it can't push it out the back and it gets backed up. I have seen this a lot with the saab turbos. you said you can pull your mufflers? try it. also if you can see into your cat, check and make sure it is clear. just my $.02 from what I have seen with other cars.
Currently birdless, but will get another someday!
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natmac3 Offline
Administrator
#19
Quote:Originally posted by Speeds8erM-1:
[Image: smile.gif] It almost feels like it pulls harder at part throttle than WOT.

That's funny mine has Always felt the same way. And I know it's not an exhaust restriction... I think that may be related to something other than the Gillis valve.

--n8



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It's not so much that I enjoy working on my car, it's just that no one else will do it for free...
1987tc
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Speeds8erM-1 Offline
Member
#20
I cant pull my mufflers, I can knock one of them undone though because it's loose. [Image: smile.gif]

It had a split intercooler hose, we put some duct tape on it and put it on upside down so the leak wouldnt be as bad. It was still running like hammered sh!t last night, turned onto the road, almost back to the shop where my friend works and the car died. I tried and tried to crank it, checked under the hood, didnt see anything wrong, checked the fuel pump relay, that wasnt it. We were standing by the car, I said, it could be the timing belt, pulled back on the cover, sure enough, bastard timing belt broke.

We got that fixed tonight, it's gotten colder, so I drove it home and it was pulling pretty good, set the overboost buzzer off a couple times. It still has a leak I guess but not as bad.
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