tooo much boost

[95awdboost]

hey guys a few weeks agoo I removed the restrictor in the wgs. ever since then I have had a issue with maintaining boost. I used to be able to hit about 14psi in first through third gear but then it started to spike to higher psi's. so I figured my t25 was shot. so I threw my 14b on it and same so far ive only let it hit 15 psi and that's at barely half throttle I haven't thrown my mbc at it yet cause I don't kn ow if that would help. oh by he way car is a 96 talon tsi fwd

 

[Archer Fabrications]

Are all the wastegate lines snug? If you just removed the restrictor it ahould boost 3 or so psi more.

 

[95awdboost]

lines are all straight buti don't understand how im makin soo nuch extra boost

 

[99ECLIPSEGSXDSM]

How do you have your wastegate lines hooked up? With no boost controller you should have just one solid line from the nipple on the wastegate to the boost source. Make sure they are in good shape and not dry rotted and cracked.

 

[95awdboost]

hooked up wategate to boost source and a line tee'ed in to the wgs on the lower port and the upper port of wgs goes to intake

 

[99ECLIPSEGSXDSM]

That's your problem. Take the tee'ed part out. You're not getting pressure to your
Wastegate because its dumping into your intake. One solid line and cap off that nipple on your intake.

 

[95awdboost]

so run from wastegate to boost source (licp) wont I throw a code for no wgs in the loop im obd2

 

[99ECLIPSEGSXDSM]

The only way you would throw a code is if you disconnected the restrictor from its power supply. If you did that plug it back in and don't run lines to it.

 

[95awdboost]

ok ill give it a try so wastegate to boost source only correct?

 

[99ECLIPSEGSXDSM]

Yup. And cap off the nipple to the intake

 

[95awdboost]

since supplys arnt at my disposal right now could I just route the boost source to the waste gate and jus leave the other lines how they are as long as there no part of the system

 

[99ECLIPSEGSXDSM]

Could you, Yes. Would I, no. If you leave a cap off your intake nipple then it's just like a boost leak. If you don't have the supply's then I would leave it as it is and not "get on it". Until you get one new vacuum line an a cap.

 

[Archer Fabrications]

Hinestly loop the wastegste line to the compressor nipple, bypass the bcs, leave it plugged in.

 

[95awdboost]

ok so im running the vacuum line from the boost source(licp) to the wastegate and still getting to much boost round 15-18ish.... im gonna throw my boost controller on it this weekend but why is it that with the lin es routed how they should be stock am i getting to much boost ?

 

[99ECLIPSEGSXDSM]

Because you swapped to a 14b it is possible you're running into a think called boost creep. Very common with that style of turbo. Are you running any less boost then before when you have the lines hooked up wrong? My buddy threw a boost controler on his when he was having this problem and allowed him to not hit boost cut.

 

[Archer Fabrications]

Maybe your flapper is stuck closed.
Adding a boost controller only means you will be able to raise the boost more. I think make sure the waste gate flapper arm is opening.

 

[Insane20]

Agreed, you should hook a bike tire pump to your wg nipple and pump it up and see if the waste gate is even working.

 

[JusMX141]

hooked up wategate to boost source and a line tee'ed in to the wgs on the lower port and the upper port of wgs goes to intake

I *think* you may have the vacuum lines on the boost control solenoid backwards...otherwise everything you've stated here is the correct way for the lines to be run:

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If that's the case, it would explain why you have no control of boost whatsoever. Another possibility is a seized solenoid which isn't throwing a check engine light.


The concept here is that the boost control solenoid bleeds pressure in the vacuum line as needed to raise the boost level. The less pressure that reaches the actuator, the longer it stays closed and the higher your boost level will be. This also allows the actuator to snap closed quicker between shifts instead of remaining open from residual pressure left in the line, allowing for quicker transient boost response....much like a "bleeder-style" MBC works. If the BCS solenoid is closed, any existing boost pressure remains trapped in the line unless it's tee'd into the boost source like that.

The lower nipple doesn't necessarily HAVE to be recirculated back to the intake...some intakes don't even have a nipple for a BCS vacuum line. It's simply done that way to keep everything sealed so no dirt or water can reach the solenoid.

 

[punxnotdead185]

Just run a vacuum line from the nipple on the jpipe to the wastegate assuming your still internally gated, if you have an external gate only hook a line to the bottom port and leave the top port open, only use the top port if you have an electronic boost controller, no reason it should over boost then.