North American Turbocoupe Organization



trouble boosting
k98311 Offline
Member
#1
so if i only boost 2-3 pounds itss fine but if i go over that i loose power, but if im at 3 grand or more then it gets about half power and goes. ive replaced the fuel pump the fpr and fuel filter any ideas?
1986 gold TC 5 speed 100000 miles turbo muffler cat delete
Sounds like a turbo diesel people say
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Pete D Offline
Administrator
#2
What fuel pressure readings do you get at idle?
Pete Dunham


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Jeff K Offline
Administrator
#3
Vacuum / pressure leak? Carefully check the IC hoses for cracks, leaks, etc. Some cracks only open under boost. Also be sure all hoses are securely clamped.
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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jmthunderbirdturbo Offline
Posting Freak
#4
could be VAM hose closing up, ive seen that. which pump did you replace? don't 86's have two, a volume from the tank and a high pressure on the frame canister?

could also be blowing out spark from weak wires, dirty or poorly gapped plugs, or a failing coil.

when you replaced the fuel system components, did it change anything?

any other mods besides what in your sig?

-J0N
APRIL 2018 - LOOKING FOR A NEW CAR. PM me if you have an 87-88 roller or cheap TF for sale.
1988 TC 5MT-Blue/Blue check-off car. resto-project.
2006 Honda Odyssey 5AT, baby-mobile.
2013 F-150, 5.0, 6AT, 4x4, snow white paint.
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k98311 Offline
Member
#5
Sorry for the delay guys broke my WGA snap ring off, its a bitch to find one that small! before boost would just slow the car down but now after my changes it only responds well to boost after 3 grand
My mods are as follows
FMIC
WGA runs off vacuum tree boost
Running only 10 pounds right off the WGA
Cat delete
straight through muffler
cone filter
New 255 pump
umm i think thats it.haah
1986 gold TC 5 speed 100000 miles turbo muffler cat delete
Sounds like a turbo diesel people say
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k98311 Offline
Member
#6
and i was 90% sure there was only one pump on the 86 may be completly wrong though
ill probably change the coil next week i just did the wires and plugs though ( upgraded to some e3's!) after changing the pump is when i noticed the difference though
1986 gold TC 5 speed 100000 miles turbo muffler cat delete
Sounds like a turbo diesel people say
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TurboBoost88 Offline
Member
#7
I thought the 86 and down had 2 fuel pumps ??
88 TurboCoupe,Midnight Metallic Blue on Blue cloth, 140 m.p.h. speedo, 96,000 miles, 5spd. Gills valve, many new parts waiting to be installed..88 TC, Silver, 5spd, My first car, wish I still had that one! Built for customers: 67 Ford Fairlane,69 Mach I,70 Mach I Clone,95 Ranger 2.3/5.0 EFI Conversion,99 Cobra Procharger SC-1 Install/Tune,Factory Five Racing Mark III Cobra #4114,1955 Black on Black Thunderbird for local Ford Dealer owner's wife.
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TurboBoost88 Offline
Member
#8
one frame mounted high pressure and one low pressure in tank
88 TurboCoupe,Midnight Metallic Blue on Blue cloth, 140 m.p.h. speedo, 96,000 miles, 5spd. Gills valve, many new parts waiting to be installed..88 TC, Silver, 5spd, My first car, wish I still had that one! Built for customers: 67 Ford Fairlane,69 Mach I,70 Mach I Clone,95 Ranger 2.3/5.0 EFI Conversion,99 Cobra Procharger SC-1 Install/Tune,Factory Five Racing Mark III Cobra #4114,1955 Black on Black Thunderbird for local Ford Dealer owner's wife.
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Pete D Offline
Administrator
#9
I'm pretty sure the 86s were a one pump in the tank setup
Pete Dunham


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Not B Anymore Offline
Administrator
#10
Pete D Wrote:I'm pretty sure the 86ss were a one pump in the tank setup

Yup
Brian Leavitt
'86 TC 5-Speed -- MS2x w/COP | 83 lb. injectors | T3/T4 50 Trim Stage 3 .63AR | Full 3" Exhaust - No Cat | Motorsport FMIC | Ranger Roller | Ported E6 | Walbro 255HP | Kirban | 20psi | 120-amp 3G | 8.8" 3.55 rear | '03 Cobra Wheels
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