North American Turbocoupe Organization



Turning up the boost on a 87 TC
xcrunnerbd Offline
Posting Freak
#11
Do you have any supporting mods? You can turn up the boost, but without some you won't see as much gain. A 2 Stage controller of some sort can still allow full use of the fuel switch.
Project 13 sec. / 30mpg in '88 TC 5Speed : [email protected] / 32+ mpg

On The Car: KN cone, 2-stage [email protected] 15psi wired to fuel switch, Kirban AFPR @ 39psi, Walbro 255 HP FP, 130A 3G Alt., Full 3" Stinger Exhaust incl. cat. no muffler,

Shelf: .48 T3, ported E6, BPV
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Jeffrey Daly Offline
Senior Member
#12
With the Gillis valve installed, running premium fuel, does it really matter what position the switch is in???
1988 Ford Thunderbird Turbo Coupe 5 speed/ Gillis Valve/ 140mph Ford Motorsport gauge/ RAM Powergrip Clutch/ K&N Cone filter
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Kev Offline
Posting Freak
#13
Quote:Originally posted by Jeffrey Daly:
With the Gillis valve installed, running premium fuel, does it really matter what position the switch is in???
Yes, the switch not only changes the boost level (which is, in fact, bypassed with an aftermarket boost valve), but the switch also controls parameters in the computer which effect timing.
Kev
1988 TC 5spd
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Ritchie Thomas Offline
Junior Member
#14
Quote:Originally posted by xcrunnerbd:
Do you have any supporting mods? You can turn up the boost, but without some you won't see as much gain. A 2 Stage controller of some sort can still allow full use of the fuel switch.
Nope, bone stock.
1987 Turbocoupe
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Tom Senior Offline
Banned
#15
I would install a 255 and preasure reg set at 40 psi with vacuum connected. The octane selector advances timing 4 crankshaft degreese in preamium and in reg it retards by 4 crankshaft degreese. Those numbers represent static timing. Smile
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50RACER Offline
Senior Member
#16
So, from reading this thread, it seems that the only real difference that accounts for the stock 40 horsepower difference between 5speed and automatic cars is the boost controller? If that is the case, then adding a manual controller and limiting boost to around 15 or 16 should get the horsepower back, is that correct?
87 TC Medium Canyon Red
88 TC Black Beauty
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86 XR7 5spd Offline
Senior Member
#17
{wow thread revival !}

while IDK whether the boost schedule is the *only* programming difference (not likely)..
the reason the limit(s) are there is to protect the weaker auto trans.

so keep that in mind ...
if yur trans is marginal you may be killing it ;0
David T
T5 / ported E3 / .63 / 35# / K&N
2.5" exhaust w/ cherry bomb
30+ mpg! 8.2 0-60, [email protected] 1/4 (gTech)
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Jeff K Offline
Administrator
#18
The A4LD tranny is a POS and often fails with the stock 150 Hp of the stock 9 psi boost level. Put on the boost controller, set it to 16 or so psi, and see what happens. If you blow the A4LD (FYI the LD in the tranny name stands for Light Duty), it is a good excuse to switch to a 5 speed. The 5 speed makes the car much much more fun to drive.
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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50RACER Offline
Senior Member
#19
I have a 5 speed car with some good engine and exhaust mods that runs great! Seems like a good tranny guy could likely beef up the A4LD to make it be able to withstand the HP difference. Anyone ever attempted that?
87 TC Medium Canyon Red
88 TC Black Beauty
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SmokeyBurnout Offline
Junior Member
#20
A good transmission builder can get an A4LD to hold about 250HP. You'll throw a bit of cash at it to get it there.
1988 TurboCoupe 5speed. All stock except K&N filter, Gillis BCV, and 140 MPH speedo.
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