controlling boost on a 14b

[westwind1124]

I have manual boost controller hooked up to my stock 14b and i cant seem to do much controlling of the boost. I have tried with the wastegate solenoid and with out and only seem to be able to control boost from about 7 to 10 psi, It will not go past 10 psi that may be normal but i thought that the 14b was capable of safely pushing 14 to 14 psi of boost. Any help as to why this the only amount of control I have would be helpful

 

[nine5raptor]

you will not use the bcs and you probably have the mbc installed backwards.

 

[westwind1124]

My boost controller is not a commercially available one, i made with a pnuematic bleed valve from a robot arm at one the local factories and some vacuum line but its essentially the same thing as commercial one just no company name for it, but any way. I have tried it forwards, backwards, side wards, just about every way i can think of and I still am only able to pull ten psi out of it. Just to make sure i have it the right spot it should bleed air from the line that starts at the splice just above the wastegate and then to the solenoid, right? If I dont use the solenoid I still put the bleed valve in the same location, correct and then just run a line from there back to the front of the air box.

Something like this.

Turbo
|
|--------------------TEE---------------Airbox
| |
Wastegate Boost
Cont.
Valve

 

[westwind1124]

the boost controller comes off of that tee, i guess the puter didn't like my drawing the way it was

 

[DrZiplok]

You probably have other boost-related problems. Boost leak, leaky BOV or busted wastegate are all possibilities.

As noted elsewhere, most 14B's these days are pretty tired.

 

[nine5raptor]

or the size of the bleed will only allow you to bleed off so little boost that almost all of the boost is going to the wg. try running your bleeder in parallel with the factory bcs (bleeder) to see if you can raise it more.
Start with yours completely closed and open slowly to see if you can get more out it.

You can also try a larger bleeder valve.

 

[Isotta91]

i think u should take it back and get a different boost controller (if ur turbo is not beat). i ran 15psi on my 14b for the longest time with absolutely 0 problems.

 

[westwind1124]

nine5raptor, plz explain what you mean by running it in parallel. I tried unplugging the valve so that it wasn't even hooked up to the turbo and had an open line, I still only hit 10 psi again.

 

[L2RTSiAWD]

Originally posted by westwind1124
. I tried unplugging the valve so that it wasn't even hooked up to the turbo and had an open line, I still only hit 10 psi again.

Right becasue if you have nothing hooked up It's goign to only get you 9-10psi. Make sure your wastegate isn't cracked or the wastegate port isn't cracked. That is notorious on high mileage 14b's.

 

[westwind1124]

well, i think i fingered it out, i think my vacuum lines are to small. I unplugged the vacuum line right at the tee about 3 inches above the wastegate and left it open to vent into the air. Holy crap i didn't expect it to hit like that but it was pushin almost 16. I hooked it back up untill i can get some bigger lines so i dont blow the thing right thru my hood. Thanks for the input guys. On a side note you wouldn't happen to know why my car lopes real bad at idle. I can't get it to idle at one speed let alone the right speed.

 

[TheObiJuan]

i have a custom mbc that i quickly made on my car.
i have a ported o2, ported turbine housing, and a ported wastegate whole. i run 17psi and it does not spike, it does not creep. solid boost.
isnt base boost 9psi?
so if you are getting 10psi then your custom regulator seems to not doing much good.
why not switch to a regular manual boost controller.

 

[snake eyes]

I'm having the exact same problem with my car . I just bought a Joe P. mbc and I can't get the car to boost over 10 psi. I was going to pull off the o2 housing and check for cracks today.
But it is possible my vacum lines are to small. Which line did you pull from the Tee?

 

[westwind1124]

well my problem ended up being too small of vacuum lines. I actually unplugged the line from right above the wastegate just to try it. I pulled the one that goes from the Y about six inches above the wastegate. I pulled the one that leads back to the solenoid on top of the air box. I actually almost hit 17 but this isn't really a smart thing cuz you have no way of controlling the boost this way. I hooked it back up after i found that my lines were to small. I just have to go buy some bigger lines now. The bigger the diameter you can make work the better.