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Topic: boost creep (Read 1042 times) previous topic - next topic

boost creep

Ive tried a few different combos with the vacuum lines and nothing will hold boost at one level. Any suggestion with what i can do? diagrams and pics will help out alot!! ive looked at a few pics and diagrams and they didnt work.
1987 turbo coupe 5speed: Boport stage 3 head/2.5 cam , Precision stage 3 50trim .63 turbo, Tial 38mm wastegate, Jangus gutted/ported intake manifolds, 60mm tb, Jangus open dumptube, Jangus 3" elbow, Perrin boost controller,Esslinger adjustable cam pulley, Esslinger small crank pulley, stinger FMI, RFL BOV, Spec stage 3 clutch, B&M short throw, 140 speedo, Walbo 255lph, BBK fpr, 3G alternator, ARP studs.  Be faster... :poke:

boost creep

Reply #1
This on the stock t3?  If so, the only way you're going to control it is either port the wastegate hole, or go external.  Mine - unported head, bo 1.5, e6, 3" exhaust - at 18psi above 5000, it creeped to 25psi.  I dont have a ported wastegate hole either.  Mines a .48 T3 though too.

88 t-bird tc - 14.97 @ 90  IHI 18 psi + k+n filter...so far - NOW HX-35 @25psi - 12.75@112    348rwhp/395rwtq
78 F-150 - 11.61@120 on 175shot N20 - 12.55@110 on motor - 5200# race weight:hick:

boost creep

Reply #2
by waste gate hole, do you mean the one on the turbo or the actuator?
1987 turbo coupe 5speed: Boport stage 3 head/2.5 cam , Precision stage 3 50trim .63 turbo, Tial 38mm wastegate, Jangus gutted/ported intake manifolds, 60mm tb, Jangus open dumptube, Jangus 3" elbow, Perrin boost controller,Esslinger adjustable cam pulley, Esslinger small crank pulley, stinger FMI, RFL BOV, Spec stage 3 clutch, B&M short throw, 140 speedo, Walbo 255lph, BBK fpr, 3G alternator, ARP studs.  Be faster... :poke:

boost creep

Reply #3
Typically you need to enlarge the hole thats in the exhaust housing, depending on how much you port it, determines if you need to get a new flap, sometimes the flap is big enough.
83 Thunderbird Heritage - Right Hand Drive
95 Falcon GLi

 

boost creep

Reply #4
oh wow thats more than what i want to do. thank you very much for the help. i'll just make some goofy way up for it to get close (last time it involved using a hose clamp on the tube itself to cut down the airflow after it went to the boost controller and it it only went up one pound of boost creep!)
1987 turbo coupe 5speed: Boport stage 3 head/2.5 cam , Precision stage 3 50trim .63 turbo, Tial 38mm wastegate, Jangus gutted/ported intake manifolds, 60mm tb, Jangus open dumptube, Jangus 3" elbow, Perrin boost controller,Esslinger adjustable cam pulley, Esslinger small crank pulley, stinger FMI, RFL BOV, Spec stage 3 clutch, B&M short throw, 140 speedo, Walbo 255lph, BBK fpr, 3G alternator, ARP studs.  Be faster... :poke: