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Old 02-15-2011, 12:03 PM   #1
WRX WARRIOR
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Default Boost problem, only 7 psi at max boost!

Any ideas on why my 04 wrx is only hitting 7 psi at max boost?
A friend of mine told me this
"Check to see if you have a tubing from wastegate to stock boost solenoid"

i did so all connections are as they should be.
also would instaling a MBC and then turning up the boost get me out of this mess?
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Last edited by WRX WARRIOR; 02-15-2011 at 12:33 PM.
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Old 02-15-2011, 12:33 PM   #2
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Are you sure you didn't hook your vacuum line after the restrictor pill?
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Old 02-15-2011, 12:36 PM   #3
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Your BCS is most likely bad. This just happend to me, I put a new bcs in and am now hitting my target boost.
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Old 02-15-2011, 12:36 PM   #4
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let me take a picture of what i was looking at form the guyu who told me
"Check to see if you have a tubing from wastegate to stock boost solenoid"



ok so connection #1 is attached to wastegate thingy.
#2 both T parts with the clamps are good to go. and the long one that goes to the Solenoid is all goo nothing is un plugged or anyting.
and #3 is plugged up to the turbo itself with a clamp.

so i don't know what else to look for?

Last edited by WRX WARRIOR; 02-15-2011 at 12:56 PM.
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Old 02-15-2011, 12:50 PM   #5
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Disconnect the boost hose from the wastegate actuator. Take it for a spin and see if you can hit high boost. Be careful as it may spike--do not drive like this for a prolonged period. Let us know what the results are.

Edit: And no...installing a MBC is not a fix for your problem. That is a band-aid that can cause damage in this situation.
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Old 02-15-2011, 01:01 PM   #6
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ok so disconnect #1? ill do that let it warm up then try to let it hit full boost.
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Old 02-15-2011, 01:04 PM   #7
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^^ Don't do that.. It wont "MAY" spike - basically unrestricted boost as high as the stock turbo can physically flow....

Either someone replaced a bit of hose in there and you no longer have a restrictor pill - the hose at the bcs is leaking badly - the bcs is bad - or your turbo is on its way out..

So make sure the restrictor pill is in there - pull the vacuum line off and check for cracks.

You "should" get a check engine light if the bcs is bad.
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Old 02-15-2011, 01:08 PM   #8
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Quote:
Originally Posted by BenGSX View Post
^^ Don't do that.. It wont "MAY" spike - basically unrestricted boost as high as the stock turbo can physically flow....

Either someone replaced a bit of hose in there and you no longer have a restrictor pill - the hose at the bcs is leaking badly - the bcs is bad - or your turbo is on its way out..

So make sure the restrictor pill is in there - pull the vacuum line off and check for cracks.

You "should" get a check engine light if the bcs is bad.
It's not going to hurt as long as you take your foot off the gas when boost approaches target.

You have no idea what's going on with the vehicle at the moment. This test will narrow down the possibilities drastically.

If the BCS is bad electrically...yes. If the BCS is stuck or mechanically binding....no...you will not receive a CEL in this instance.
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Old 02-15-2011, 01:16 PM   #9
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if you disconnect the long hose from the BCS you should be running just the wastgate spring preasure, probably around 17 psi or so if that is the case then yes the BCS is bad or your wastgate itself could be bad too, I thought my issue was the BCS so I tried one that I knew worked (if you have a buddy with one that is good try it) but my issue ended up being the wastegate well the little nipple that the #1 hose connects to actually snapped off.

Like BenGSX said though check for cracks and the restrictor pill, I have also been told that the pill can sometimes get turned sideways or somethin and can cause issues like this too. you may just have cracks you just can't see.

Being an 04 it's gettin towards that time where your hoses are getting pretty hard and frail so they will start cracking here and there. Good Luck figuring it out!
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Old 02-15-2011, 01:20 PM   #10
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Status update!
disconnected #1 reached 15psi boost before even hitting 3 grand in 2nd gear... drove in 1st gear 2grand the rest of the way around my block after that i didnt wana blow up my car lol.

so what is this restriction thing every ones talking about?
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Old 02-15-2011, 01:24 PM   #11
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Quote:
Originally Posted by WRX WARRIOR View Post
Status update!
disconnected #1 reached 15psi boost before even hitting 3 grand in 2nd gear... drove in 1st gear 2grand all the way around my block after that i didnt wana blow up my car lol.

so what is this restriction thing every ones talking about?
Ok, next step is simple. Try an ECU reset and then go for a short drive to see if you can reach normal boost (plug in the actuator hose if you haven't done so already).

If no dice..check for the restrictor pill...it is inside the hose that runs from the turbo's compressor to the small plastic 'T' fitting. You should be able to squeeze the hose and feel for it.

If you're still having issues then remove the BCS and give it a thorough cleaning. Manually energize it open and close several times. It should audibly 'click'.

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Old 02-15-2011, 01:27 PM   #12
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going to go check for that restriction pill thingy. and how do i do a ECU reset?
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Old 02-15-2011, 01:31 PM   #13
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umm...one of my hoses broke =[ the smaller #1 hose that went from waste gate to T section had a crack in it and when i was moving it it broke in half...off to auto zone in my civic to get some hose.
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Old 02-15-2011, 01:41 PM   #14
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I have a defi boost gauge and I hardly ever reach above 0 psi unless I gun my car past 4k rpm itll slowly climb up off 0 from below 20.
Is this normal?
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Old 02-15-2011, 02:00 PM   #15
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Originally Posted by Ridahcrew View Post
I have a defi boost gauge and I hardly ever reach above 0 psi unless I gun my car past 4k rpm itll slowly climb up off 0 from below 20.
Is this normal?
No it's not. Start your own thread and you'll get some help. Just so this one isn't convoluted.
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Old 02-15-2011, 02:20 PM   #16
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ok so back from the zone. got some new hosery,replaced from waste actuator to the T section. yay for 8psi boost. so the long hose from the T clamp (#2 in my picture above.) looks as tho is is made up of 2 hoses. (see #4 in new picture) should i take that and just make it 1 solid hose? and in new picture #5 is where that restriction pill is right? is there any way to get that into a new hose or will i need to go to subaru for that?

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Old 02-15-2011, 02:29 PM   #17
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The only hoses you should be concerned with causing low boost are #5 and #1. Can you feel the restrictor pill in hose #5?

You can push the pill into a new hose with a long thin screwdriver. I would use a small piece of wood so you don't eat up the pill since it's made of brass.
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Old 02-15-2011, 02:31 PM   #18
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letting the car cool of for a second im goin got check hose 5 now.

Status update. Took hose 5 off the restriction pill is in my hand. it was way far up on the T joint like right next to it. could that have been the problem?

replacing hose 5 with new hose and inserting the pill about half way inside.

Last edited by WRX WARRIOR; 02-15-2011 at 02:37 PM.
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Old 02-15-2011, 03:13 PM   #19
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ok so i replaced #5 hose scooted the rest. pill back some and saw a whopping 10PSI!
then took the pill out and drove it and it dropped back down to 5PSI

now im on to my next ?

Quote:
Originally Posted by Haelan View Post

If you're still having issues then remove the BCS and give it a thorough cleaning. Manually energize it open and close several times. It should audibly 'click'.

how exactly does one do that?
more specific, what do you mean by "Manually energize it open and close"

Last edited by WRX WARRIOR; 02-15-2011 at 04:28 PM.
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Old 02-15-2011, 04:20 PM   #20
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Quote:
Originally Posted by WRX WARRIOR View Post
ok so i replaced #5 hose scooted th epill back some and saw a whopping 10PSI!

now im on to my next ?




how exactly does one do that?
more specific, what do you mean by "Manually energize it open and close"
You need to provide it power from a 12VDC source. You can use the car battery and a couple wires or something like a small AC power adapter. I use one from a Linksys router. I cut the plug off so I just have two bare wires.

Removing the BCS from the bracket makes this a lot easier.

Another question. How long have you had this problem? This can be caused by incorrect wastegate actuator / pill setup when doing a turbo swap.
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Old 02-15-2011, 04:32 PM   #21
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i guess since i bought the car. i got it about 5 months ago and i just last week got around to putting a boost gauge in.

It is a stock wrx TDO4.

and is there a specific spot to give the BCS some power?
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Old 02-15-2011, 04:34 PM   #22
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Quote:
Originally Posted by WRX WARRIOR View Post
i guess since i bought the car. i got it about 5 months ago and i just last week got around to putting a boost gauge in.

It is a stock wrx TDO4.

and is there a specific spot to give the BCS some power?
The TD04's from the 2.5L WRX's have different pills and wastegate actuators. It one of those was used you will have low boost until you get them swapped to the correct components.

The engine harness plug on the BCS has two pins. That is where power is applied.
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Old 02-15-2011, 04:37 PM   #23
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no its still the 04 tdo4 the guy i got it from was an older guy. did nothing to the car. like i said now that i replaced both them hoses i am at 10 psi now. so you think cleaning teh BCS would help me get to that missing 5PSI?
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Old 02-15-2011, 04:45 PM   #24
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Quote:
Originally Posted by WRX WARRIOR View Post
no its still the 04 tdo4 the guy i got it from was an older guy. did nothing to the car. like i said now that i replaced both them hoses i am at 10 psi now. so you think cleaning teh BCS would help me get to that missing 5PSI?
Yes, give it a try. You can spray some electrical cleaner through the tubes as you're cycling power. With no power applied you should not be able to blow through the BCS. With power applied you should be able to blow through it.
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Old 02-15-2011, 04:49 PM   #25
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I've had the same problem fr awhile now, anyone know if the restrictor pill is a generic part you can ask for at autozone or has to be from the dealer?
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