North American Turbocoupe Organization



Fast and Slow?
Harvs Offline
Senior Member
#1
Is anyones car slow one day, and fast somtimes. Somtimes it hauls and somtimes it's slow, my other one did this, why is this?
Sandlewood beige 88 coupe 93k/ super 60 T3 at 24 pounds/ ATR 3" no cat or tail pipe/ 255lph high pressure pump/ Kirban AFPR at 42/ Spec stg3/ GN FMIC/ 1g DSM BOV/ 14* timing/ disconected KS/ Tri-ax short throw/ Autometer boost,vac and air to fuel/ 140 spedo/ Ford motorsports 5300-c springs/ tubular rear upper cntrl arms.
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Noname
Guest
#2
Do you always run the same grade of gasoline from the same station? A bad tank of gas can cause detonation, which the EEC combats by retarding timing (by a total of 7 degrees, I beleive). Under WOT when the car is only running about 30º total ignition advance (base ignition timing + computer controlled timing), 7º is quite noticeable. Try disconnecting your knock sensor (be SURE to run premium gas and a safe amount of boost if you choose to do this) and see if you notice a difference.

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Estoril blue 1987 TC 5spd, 136k miles
k&n cone in fenderwell, PRofec B electronic boost controller, kirban adjustable fpr set at 44psi base, walbro 255 hi-pressure pump, Stratmosphere Forge bypass valve, ported e6, volvo front mount intercooler, t3/t4 50 trim / stage III .63, full 3" exhaust, eec-tuner, 55pph injectors, dave compton a/f meter, Nitto 555R drag radials
Best 1/4 mile (before tuner, turbo, injectors, drag radials): 14.120 (with 1.983 60' time)
Best trap speed: 98.44mph
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Pete D Offline
Administrator
#3
Outside air temperqture can have a big effect on how they run. Cold = good, hot = not as good.

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NATO Member. it's not a vice, it's an obsession
Good judgement comes from bad experience, and a lot of that comes from bad judgment.
88 TC X 2, 86 SVO, mods list at
http://www.turbotbird.com/showroom/pd_88tc.htm
Pete Dunham


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IRONBULL Offline
Junior Member
#4
Heat & Humidity are the two biggest negative factors on a 2-3T motor.
(Dubbed from my Stangbangerz sig)
The Famous 2-3T dragstrip conversion
MulletHead- "I saw the thunderchicken run, what cha got done to that 5vO"
Me-"It's a TurboCoupe"
MulletHead-"Wha"!
Me-"A TURBOCOUPE" See look here under the hood.
MullettHead-???? You hacked the 5v0 in two huh.
Me-I give up
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segfaultxr7 Offline
Posting Freak
#5
Same here, it's really weird. The power difference is especially noticeable if I suddenly punch it in second gear. Sometimes it'll shove me back in my seat, other times it doesn't pull nearly as hard.

A good tuneup helps if it's really starting to lose power, but some variation seems to be pretty much normal.
88 TC 5-speed
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