Boost issue

[1gcrazy]

So I have only checked the shaft play on the turbo, nothing else.
I'm buying the car and havn't had a chance to get it home yet.
Heres my issue:

Driving normally and once you get into boost it only boosts to 3-5 psi.
No weird noises.
The previous owner got rid of the boost controller and ran the hose from the wastegate and BOV straight to the manifold, is this whats causing the problem?

 

[slickers111]

Definately leaking boost.
Could be the BOV, Wastegate, of just a bad connection of the pipes.

 

[1gcrazy]

I checked all the pipes... they were all tight, I didn't think a boost leak would only allow 5 psi. Is it because the car is only running waste gate pressure??

 

[goldbomb79]

is it a factory turbo? The wastegate could be sticking open. I know my old 14b turbo had issues with the wastegate sticking. Also, if he removed the boost controller I'd check all over for any unhooked vacuum lines.

 

[norcal_drifter]

do a leak test

 

[1gcrazy]

I guess I just want to make sure it wont be a head or lower engine problem, which I already worked out in my head but wanted to make SURE i'm not having a brain fart...

 

[cookmeup272]

If you had a problem in either the head or the block, Im sure you would hear it. Do the BLT and report back

 

[nek]

Is it just me or should he not be connecting his bov to his intake like that. Isnt the proper way " on a 2g" to go straight from the wastegate to the intake if you dont use a bov? You figure the stock 2g system goes wastegate -> bcs-> intake... Id like to hear other peoples input but I would think the bov being connected is causing a problem.

 

[KKneipper]

My BOV line is hooked up to my intake manifold/throttle body. It's not Teed off to the wastegate. The line to the BOV should be untapped, meaning nothing should be hooked up to that line other than the BOV. There is a pressure source nipple on the intake side of the T25 (stock 2G turbo) that I ran to my MBC, then to my Wastegate. One line at the stock BCS (wastegate solenoid) is run to my intake pipe, and the other is plugged with a screw.

I have no problems with mine, and if that one is hooked up differently, I'd suggest asking about swapping it to see if the boost gets higher.

Also, if the vacuum line leading to the BOV is tapped, then it's loosing pressure and not allowing the BOV to stay shut, therefore causing it to open prematurely... Not always the case, but definitely COULD be.

 

[98GSXtacy]

Make sure that the wastegate is connected to the nipple on the turbo, not the manifold. Like stated above, the bov should have an uninterrupted line to the manifold but the only hose on the wastegate should go to the nipple on the turbo. That way, the wastegate will open at the boost level at the turbo, not the manifold. If it is hooked properly already or changing it doesn't raise boost, boost leak test. I am just suggesting doing this because all it takes is looking to see if there is a hose going from turbo to wastegate, you can't miss it. I don't think you should be worried at all about any head or block issues with it. Oh yeah, possible pre turbo exhaust leak as well, i.e. cracked manifold, blown gasket, etc. Good luck.

 

[1gcrazy]

Fixed the boost leaks, no exhaust leaks.
Fixed the vacuum lines.
Now have a MBC.
Still only 7psi.
Whats the deal?

 

[Bluefire16]

^^ you have 758 posts and you cant think of why a car my be boosting only 5psi? Sounds like a boost leak. Try the most common and simple problem first.

I still think boost leak or vac line.

Or possible the bov is leaking.

Or like stated before wastegate.

 

[1gcrazy]

^^ you have 758 posts and you cant think of why a car my be boosting only 5psi? Sounds like a boost leak. Try the most common and simple problem first.

I still think boost leak or vac line.

Or possible the bov is leaking.

wastegate.

Hello tard, how are you this morning?

I didn't realize that my tech post count meant I knew everything. Since you have less than me, and I'm supposedly "god," does that mean you're Jesus??

As 'Or like stated before' all boost and exhaust leaks are gone.

I will be checking the waste-gate in the morning. I have a feeling it's the turbo. Dip shit before me welded a 7mm socket to the secondary drain next to the ORIGINAL oil feed line on the head to feed oil to the turbs due to kinking the feed line. It's a mess. The awesome hose they ran to the turbo was kinked and i'm assuming it's been that way for a while.
I checked the shaft play and it's pretty damn good. I meant to check the waste gate today but 'god' has to work for a living. We'll see how it looks tomorrow.

 

[MJBean420]

You check all the hotside bolts too? I know I had a PITA leak with a turbo bolt. I could only hit like 10 psi.

 

[1gcrazy]

I did check those bolts, They were loose and tightened originally, it helped a little but not a whole lot. I tested the wastegate today, it only moved about 3/4 of an inch to an inch at the tip of the wastegate arm. I'm betting on that.

 

[esoteric]

Did you do an ACTUAL boost leak test? When I tested mine I was sure everything was tight, the SMIC had 4 pinholes in it, the piping had 2 and a few couplers would crack under boost and open up.

If you did a proper boost leak test and are still only getting 7psi there is a good chance your BOV is garbage, if its the 2g BOV then this is your problem almost certainly, Every "wiseman" I have talked to says a worn 2g BOV is only good for 5-8 PSI.

 

[98GSXtacy]

BOV is my number 1 suspect. When mine cracked shortly after buying the car it would only get to 7-9 psi and that's it. Replaced it and boost shot up to proper levels right away. If not the bov, then wastegate. Anything other than those two things isn't coming to mind right now. Good luck man, hopefully you get it figured out and fixed.

 

[Bluefire16]

Hello tard, how are you this morning?

^^ Really? Remember, your the one asking for help here not me.

And as far as "knowing everything" it appears you know nothing. Considering this isnt a real hard, and it can only be the cause of a few things.

Your leaking air, its the matter of where. As far as im concerned you still probably have yet to preform a real boost leak test. If not like i said before, your bov is next, then check the wastegate.

 

[gsxeclipse97]

Well these test are really time consuming and are not sure to fix your issue its more than what can be seen on the surface. I did a boost leak test yesterday found 3 big ones and fixed them and the car still runs like shit. So.. With that said and I did it from the manifold, I'm trying to work back to the turbo. And even with major boost leaks I still wad getting more than 7psi.

 

[XiKeiyaZI]

Wait... explain the routing from the turbo/BOV/Manifold...

The BOV should go directly to the Intake Manifold
Since the BCS(Boost Control Solenoid) is missing... try this.

Attatch a hose from the Nipple on the Jpipe to the Waste Gate. This will give you stock boost at 7psi. When you want to install a MBC, just cut that hose in half and install it there between the Jpipe and the Wastegate

The BOV's load and release is based off of Intake Manifold pressure. Mine is setup as I stated above and I get perfect boost and the BOV functions properly.

If my explaination isn't hitting home or I'm in the wrong direction I apologize. It's rather early in the morning.

Pictures always help as well!

 

[KKneipper]

You can pick up a vacuum gun at AutoZone or Checker/O'Reilly. Hook it up to your BOV where the line comes in from the manifold. If the BOV starts to open up before your desired boost level, then that would be your problem. If it is, then I would suggest picking up a 1g BOV with an adapter. All together you could probably find one for around $50-$75.

 

[Bluefire16]

7psi....for stock boost. Boost levels are all different with all cars. So its not always 7psi, sometimes 8 or even 9psi. Then a 2g jumps up to 11 or 12, and hell mine ran 13 stock.

 

[1gcrazy]

Did you do an ACTUAL boost leak test? When I tested mine I was sure everything was tight, the SMIC had 4 pinholes in it, the piping had 2 and a few couplers would crack under boost and open up.

If you did a proper boost leak test and are still only getting 7psi there is a good chance your BOV is garbage, if its the 2g BOV then this is your problem almost certainly, Every "wiseman" I have talked to says a worn 2g BOV is only good for 5-8 PSI.

I have a 1gb with a Greddy BOV via the previous owner. Havn't looked at it much since its a quality part. I have a 1g bov on stand by. It has been included in my boost leak test and secures up to 20 psi.

BOV is my number 1 suspect. When mine cracked shortly after buying the car it would only get to 7-9 psi and that's it. Replaced it and boost shot up to proper levels right away. If not the bov, then wastegate. Anything other than those two things isn't coming to mind right now. Good luck man, hopefully you get it figured out and fixed.

I'm pointing towards wastegate first... I'm not at home or every questionable part would already be swapped and I probably would be reporting good news...

^^ Really? Remember, your the one asking for help here not me.

And as far as "knowing everything" it appears you know nothing. Considering this isnt a real hard, and it can only be the cause of a few things.

Your leaking air, its the matter of where. As far as im concerned you still probably have yet to preform a real boost leak test. If not like i said before, your bov is next, then check the wastegate.

I dont remember saying, "Hey Jesu, I MEAN bluefur, smurfpubes, please help me with me very simple issue!!"
Wait a tick, are you bashing in the newbie forum? As far as me knowing nothing is concerned, I believe that is against the rules. You might wanna stfu. Just sayin...
Good thing i'm not concerned with what concerns you. I think you've helped this thread enough. Good day sir.

Well these test are really time consuming and are not sure to fix your issue its more than what can be seen on the surface. I did a boost leak test yesterday found 3 big ones and fixed them and the car still runs like shit. So.. With that said and I did it from the manifold, I'm trying to work back to the turbo. And even with major boost leaks I still wad getting more than 7psi.

I did seal the system on the intake side pretty solid. I heard a hiss coming from my turbo area, turns out my boost leak tester has a boost leak... jesus h...SMURFPUBES!
I do have a broken stud above the #1 cylinder but that should be fixed here by Sat.

Wait... explain the routing from the turbo/BOV/Manifold...

The BOV should go directly to the Intake Manifold
Since the BCS(Boost Control Solenoid) is missing... try this.

Attatch a hose from the Nipple on the Jpipe to the Waste Gate. This will give you stock boost at 7psi. When you want to install a MBC, just cut that hose in half and install it there between the Jpipe and the Wastegate

The BOV's load and release is based off of Intake Manifold pressure. Mine is setup as I stated above and I get perfect boost and the BOV functions properly.

If my explaination isn't hitting home or I'm in the wrong direction I apologize. It's rather early in the morning.

Pictures always help as well!

This is all accomplished. I have a boost controller hooked up and turned to full boost. NOW i'm only hitting about 12psi.

Since I heard the hissing around the boost leak tester(cracked around the pneumatic fitting) and i've bluegoo'd it pretty well, I am almost sure it's my wastegate. I used a compressor to test it and it seemed to hold boost alright but its only opening the wastegate about 3/4's of an inch at the tip of the arm. I'll swap it with a good one and probably have this figured out by Sat.

 

[Bluefire16]

Haha your a joke...good luck with your car, dont blow it up.

 

[92AWDTalonTSI]

Let the guy solve his problem in peace. We cannot even call a Rally Inspired Cosmetically Enhanced car a R*** car because it offends people of the orient. And you come here and post something that implies that he is stupid? Come on really. Stop with the BS.