Slant 6 Turbo 68Dart Project
if you dont wanna be THAT guy its simple, dont. not everyone takes the beaten path. show me an n/a slant with 400hp that can still be street driven, idles normally, and still gets 20+mpg. im sure once he gets it worked out he will have absolutely zero regrets.
This is INSANE.... like a really bad dream!
I haven't suggested anything because I have NO IDEA what in the hell could be going on to cause this puzzling syndrome.
The only thing I could think of to do would be to leave all the exhaust plumbing intact, as installed,
down to the turbo, and forget about hooking up
any of the cold-side plumbing.
Get someone to help you do this: Start the engine, put it into drive, and apply the brake AS HARD AS YOU CAN.
Oh, and, disconnect the cold side plumbing from the turbo outlet before you start the engine.
NOW, have your helper hold his hand over the turbo's cold-side outlet, so that he can feel any pressure being generated by the spinning turbo impeller as you apply stall-speed throttle, remembering that the brakes must be locked, HARD!
I mean HARD!!!
There should be enough pressure generated during this exercise to blow his hand off the turbo outlet. There is your boost. OR NOT.
If no boost is generated, we need to find out why.
This exercise eliminates all gauge errors, all plugged-up plumbing , or cold-side plumbing leaks, and should tell you whether your problem is actually an exhaust leak of one kind or another, definitively.
I cannot imagine an exhaust leak that that would be capable of making an engine do what this engine is doing (no boost at all, under any cirumstances,) that didn't make itself known with a
very loud noise,
Be VERY CAREFUL with this stall speed deal as you could kill somebody very easily... VERY EASILY, but it can be done with a modicum of safety, if you are careful.
Just be sure that your helper isn't standing on front of the car, and go down on the throttle very slowly.... in fact, to be truly safe, position the car against a strong (brick?) wall, so it CANNOT move, when you do this; he can stand alongside the fender. No way to get hurt like that.
Good luck!!!
I'm thinking there WILL be boost, but it's being "lost" somewhere between the turbo and the carb hat.
I am sure you'll let us know; you are amazingly good at communication, and I really admire that!