North American Turbocoupe Organization



2nd gear, sometimes 15 psi, sometimes 10
gtrag94 Offline
Member
#1
86 TC, 5 spd.

Full throttle, 2nd gear, sometimes gets 15 psi, but usually 10. Doesn't get above 10 psi in any higher gear at any RPM. I know there are some differences in this in the 87/88s but does anyone know what stock should be for 86s?

I know I could force it to 15 with a Gillis or similar but I don't want to do that yet. I want to figure out what's going on, here.
1986 TC 5-spd (Red/Red cloth)
K&N Cone on VAM; front suspension by KYB, Moog, Energy Suspension.
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86XR7auto Offline
Moderator
#2
Every stock 85-86 turbocoupe or XR7 I have driven always runs more boost in 2nd than any other gear. I would assume it has to do with the load calculations and the factory boost control solnoid. The factory setup just doesnt bleed enough pressure at that gear/load.

That's my best line of BS....hahaha

Travis
86XR7 in pieces...old time [email protected] http://www.youtube.com/watch?v=kGsz7PdEqTI 88TC stock Red RHSC [email protected], 01 Z71=Nice winter ride, 01 CVLX w/HPP wifes ride!
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Jeff K Offline
Administrator
#3
Could be the cheap plastic BCS is sticking and not opening when it should to allow higher boost.

Just courious why you dont yet want to get a Gillis type valve? Cheap, easy to install, and not only does it allow you to adjust max boost, but boost comes up quicker also.
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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turbobike Offline
Member
#4
My Snap-on manual reads, 12 psi + or - 5 psi. Not much help.
85 TC,86 TC,65 Mustang GT
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86XR7auto Offline
Moderator
#5
Funny thing is about stock boost, my 86XR7 was a factory auto car. Only ran 8-9psi when I bought it. Terribly slow. Not anymore.

Travis
86XR7 in pieces...old time [email protected] http://www.youtube.com/watch?v=kGsz7PdEqTI 88TC stock Red RHSC [email protected], 01 Z71=Nice winter ride, 01 CVLX w/HPP wifes ride!
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Cracker137 Offline
Member
#6
Quote:Originally posted by 86XR7auto:

That's my best line of BS....hahaha

Travis
No thats just your analysis of their engineering analysis....not your fault they didn't give enough to draw a conclusion on lol
1987 Thunderbird TC
-T3 Turbo
-K&N
-3G 130 Amp
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TurboE Offline
Posting Freak
#7
Buy the gillis valve, you will be shocked at what your missing even if you only set it to 10psi. It builds boost faster and at lower rpm than stock. Believe me if you install it you wont care to "figure out what's going on, here".
-88 TC Black
5spd, Precision SC50 T3/T4, QH/SD Tune, Gillis, AFPR, 255FP, WB O2, K&N, Ported E6, 3" DP, ATR 2.5" Duals, 3:73 Rear, Konis, Eibachs, 18" Voxx Wheels, X Drilled Rotors.
-06 G35 Coupe Diamond Graphite
-97 Pathfinder
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