Low boost TT B4

[pl0x]

So im going to try figure out why my car is running low boost.

Reason for low boost (Let me know the multiple ones ive missed)

low compression

boost solenoid

incorrect vac line set up

intercooler leak

stuffed turbo/turbos

2ndary BOV leak

BOV leak

Blocked up pipe

missing restrictor pills

My car symptoms

Running 7psi primary 9psi secondary

smells rich on warm up & no power

With vac setup normal BOV wont go off, have to go straight from manifold to BOV (vac leak in the pipe that goes off from mani-bov line?)

How do i make it free boost for sure?, have tried pulling off lines 10 & 23 next to battery and still 7 & 9.

More low boost causes/any ideas?

[Guest itsgotgo]

if you want to freeboost it ,take the vac line off the secondary wastegate actuator and put something in the vac line.

Was it boosting normally up untill now?

[Guest boostin]

You forgot missing restrictor pills in various vac or boost lines. Are the lines all factory??

Right click and "view image" if you can't read it. Look for anything that says "orifice".

[gazzy2000]

any CELs? no check engine light?

I will hazzard a guess and say that the rich smell of fuel maybe casue the ECU is "safe mode" hense the low boost and richer mixture to be safer on the engine if it thinks there a problem.

Thats my thoughts anywho

[Guest]

Cel's ?

primary waste gate actualtor or missing restrictor pill in hose from primary compressor fitting to t junction

( this with waste gate solenoid contols boost on TT )

[pl0x]

 itsgotgo said:

if you want to freeboost it ,take the vac line off the secondary wastegate actuator and put something in the vac line.

Was it boosting normally up untill now?

No never been boosting normally.

secondary is drivers side right? ive looked for the waste gate actuator but cant see it lol??

Theres a big actuator there but its for exhaust change over or inter cooler change over i think?

have edited in the restrictor pills, cheers

Not to sure if the lines are factory, was rebuilt just before i brought it and has never boosted enough

Ive tryed this: http://www.youtube.com/watch?v=t10LQvwubDA, is this the same as free boosting or would it need to have pills etc in place for it to work? (doesn't change, still solid 7psi primary)

[pl0x]

No check light or existing CELs when i checked it awhile back, haven't done a proper reset tho

[pl0x]

 Ichi Ban said:

Cel's ?

primary waste gate actualtor or missing restrictor pill in hose from primary compressor fitting to t junction

( this with waste gate solenoid contols boost on TT )

So if i pull the hose off primary waste gate it will free boost both?

i want to check it will boost both above normal?

oh and it has boost creep to about 10 in higher revs/gears

[Guest boostin]

Yeah secondary is drivers side. No wastegate on that turbo. Only BD/G5A's had dual wastegates.

[Guest itsgotgo]

 boostin said:

Yeah secondary is drivers side. No wastegate on that turbo. Only BD/G5A's had dual wastegates.

there you go,it had to be one of them ha ha ;D

[pl0x]

So i pulled waste gate hose off the primary waste gate and it boosted to 10 primary and i got to 15 secondary.

Means boost control/pills/vac leak/BBOD could be causing the low boost?

i will check for all the pills

Could the problem be part of why the BOV doesn't go when its hooked up correctly?

(not my pic)

the little blue T peice between the manifold, i had to take it out & connected it straight threw to get the BOV to work. even with it connected it didnt boost any higher & then it had turbo surge aswell.

[nt_a_foz]

Should say that its got a brand new motor when you brought it bro lol....

Well v7 sti shorty etc...

[Guest boostin]

Tried an AFM??

[pl0x]

Oh yea cheers lol, so they could have unpluged the boost controller/removed pills etc to make sure it doesn't boost high during run in.

or just not put the pills back in

[pl0x]

 boostin said:

Tried an AFM??

Na? it was said to have a brand new AFM when motor was put in (6000kms ago) as that was what caused the failure

Edit: not said to, it did i have the receipt. it was just alot cheaper than i thought they costed, between $100-$200 i think?

[Guest]

with wastegate hose off, it should have overspooled that turbo - it should have cut out (boost cut) or even blown that turbo

10psi = gay

either the primary turbo is stuffed or the engine isnt right (ie cambelt timing / afm etc )

[dvs-b4]

yea if u where free boostin it should have reached about 19-20 psi that what mine used to do and cut when it had a problem and that was on the primary. secondry would work fine. id reset the ecu and go from there does it blow any smoke? have u cheeked play in turbos? list can go on in TTs lol easy solve single turbo it

[pl0x]

the turbo was replaced about 1000kms before new engine (primary) with a second hand one but for $600 so i guessing it must have been mint lol? but yes could be stuffed, it was sounding pretty bad when i tried to plumb the bov up normal and then had turbe surge but could hear it from the turbo lol?

it was still building boost when it changed over

it switches over at 4250rpm with no VOD

i wouldn't be surprised if the ECV had been modded to make it switch over earlier, hence low boost on primary?

but then chucking it in a high gear and flooring it at low revs, it boost spikes to max of 15ish then drops back then to hold 7psi threw to change over?? and secondary boosts 15 then in higher gears has abit of creep to 17

[pl0x]

 dvs-b4 said:

yea if u where free boostin it should have reached about 19-20 psi that what mine used to do and cut when it had a problem and that was on the primary. secondry would work fine. id reset the ecu and go from there does it blow any smoke? have u cheeked play in turbos? list can go on in TTs lol easy solve single turbo it

so even hen primary was free boosting, secondary held boost like normal?

whats normal boost on secondary?

no smoke that i know of. haven't checked turbos, and yea the next step is single, was trying to collect up parts before chrismas holidays and do it then but haven't got them and the money is better spent other places atm

[Guest]

where does the other end of the hose go. one goes to BOV and where does the other one go to?

[pl0x]

 akaynlsn said:

where does the other end of the hose go. one goes to BOV and where does the other one go to?

manifold - BOV with a tee piece in the middle which goes everywhere lol

[Guest boostin]

The small line that tee's off the primary bov should have a pill in it. If it doesn't you'll have low boost as is will leak out through that hose.

[pl0x]

ok so next thing to do is scearch & locate all pills to make sure they are there.

Will it do any damage leaving the waste gate hose off for now? no boost cuts etc.

if the primary is stuffed im not going to replace it yet will just wait and go single when i can

[nt_a_foz]

Just get your a into g and get a turbo thats the only thing left you need aint it oh and a down pipe and well do it in the holidays haha

[pl0x]

 nt_a_foz said:

Just get your a into g and get a turbo thats the only thing left you need aint it oh and a down pipe and well do it in the holidays haha

haha the only i have is a intercooler? naaa haha after hoildays...