BCS and other questions

[t4-teg]

**EDIT:** New Problem. Everything is hooked up ready to go, I took the car for a test drive and boost immediately shot to 15psi and I got fuel cut. This is when the J pipe is hooked directly to the WG. I tried with the BCS hooked up (j pipe on top port, WG on bottom) and still the same effect.

Why am I boosting so high. Every other thread ive read about removing the BCS, people lost boost not gained boost. Im guessing maybe a bad WG actuator? Would me running a ported 2g mani, stock 14b, ported 2g o2 housing and open 3'' downpipe cause the boost to spike THAT high?



Im about the install the turbo for my car. When I got the car It had no BCS, so i bought one. My question is where do i hook the vac lines up to? The J pipe nipple goes to the top port, and the wg nipple goes to the bottom? or is it the other way around.

Another question, the solenoids or w/e they are on the firewall next to the shock tower on the driver side. The one all the way to the left(driver side) has a vac line connecting the top part of it right back to the bottom part. sorry if its confusing, but thats the best i can describe it.

ANOTHER question, yes pertaining to vac lines, there are two lines running right near the T stat housing, well actually 3 if you count the one connecting to the T-stat housing. Where do the other 2 go? There not leaking vacuum and i cant trace them because they go into a wire loom and under the intake mani?

Basically, does anyone have a vac line routing diagram for a 1990 GS-T?

 

[jrohner]

Im about the install the turbo for my car. When I got the car It had no BCS, so i bought one. My question is where do i hook the vac lines up to? The J pipe nipple goes to the top port, and the wg nipple goes to the bottom? or is it the other way around.

You got it.

 

[91dsmgsx]

i know that the two running into the wire loom go to the intake manifold brace where theres actually 4 metal vaccuum line on that brace. as for the solenoids i know that the last one is a fuel pressure soleniod vaccuum switching valve a vaccuum hose should run from the bottom to the fuel pressure regulator not sure about the other one

 

[t4-teg]

awesome thanks for that info guys. Does anyone know what the two vac lines are that go under the intake mani? There not capped off or anything, and not leaking vacuum. Also, can I delete the one on the thermostat housing?

 

[Boost92awd]

Here you go this should help you out.

http://www.dsmtuners.com/forums/art...-speed-shop-vacuum-diagram-removal-1g-2g.html

 

[jrohner]

You could just eliminate the vacuum lines. It cleans up and simplifies the engine bay a lot to get rid of all that useless junk. On my 2g I got rid of the lines and solenoids and it makes it a lot nicer.

 

[91dsmgsx]

i second that^ i removed all unnessisary vaccuum lines and it looks way cleaner and clutter free

 

[t4-teg]

cool Ill probably just remove most the vac lines, but leave the solenoids and whatnot in place so i don't get and CEL's

New problem now, boost is wayyyy to high. I edited my top post with new information. I tried hooking the BCS up, aswell as hooking the j pipe vac line directly to the WG, still boosting 15+ psi.

 

[Dsmj89]

Wow that's crazy you're still boost creeping. Why are you running open downpipe anyways ? Try installing the rest of your exhaust system back on and see if it cures the problem. Let me know what happens.

 

[jrohner]

Free flowing exhaust creates boost creep. Find a way to put a slight restriction somewhere on your exhaust. 15 pounds is nothing crazy though. If you have a way to watch knock and are not fuel cutting you are fine. If you get injectors and something to tune with and up the boost to 20psi, you'll wonder how you could ever stand running 15psi. I turned my 1g talon down to 15 (from 20-21) once just as a reminder to what it was like and I couldn't believe how dead it felt; and this was back when I didn't even have different exhaust or anything on it.

 

[t4-teg]

man.. your talking to a guy who ran the turbo motor NA for about 3 weeks.. This thing flys right now .

The thing im worried about is im 100% stock. I have no tuning program, 100% stock fuel, blah blah.. I really dont want to blow the damn thing up already. Ill see If I can get the stock catback to mate up to the DP and see what happens.

Ok So my 3'' DP wont bolt up to the stock exhaust fully, so I put one bolt in, and it quieted it down just enough for it to be perfect, and now boost is holding 10psi till about 5500 rpm's then it creeps to about 12-13 which is fine with me. Next mod, catback exhaust.