I know Im probably going to get **** for this but there are alot of knowledgeable people on here and I am just seeking some help here.

So I just put on a new 50 trim Garrett turbo onto my JDM GSR (B18C) and now my boost gauge only shows 3 psi and full throttle and man, does it take a long time to get to that 3psi. I initially had a normal ebay 50trim on it and it worked just fine but I wanted to go more "legit".

- Checked all intercooler pipes and no bursts or broken welds or cut couplers.
- Thought it might be the bov so we blocked that off and still dont gain PSI.
- Took off the TIAL WG and the spring isnt stuck open.
- Tried to pressurize the intake side and didnt hear any leaks, also inspected all vacuum hoses and dont see any rips or tears.

Honestly I think I am just clueless here, does this sound like my buddy sold me a **** Garreet? But I keep thinking if that was the case I would leak oil or the turbo would smoke alot... PLEASE HELP!

 

Is the fire ring. On the wastegate?
No leaks on the intake manifold?
Loose bolts on the compressor housing of the turbo from clocking?
What kind of downpipe?
Block the inlet of the turbo and starve the motor of air if it stays on you have a leak...

 

Hey thanks alot for your quick response, really helps man!

Now im almost 100% sure there are no leaks on the intakemanifold but I havent been able to pressurize it to make sure.

Now I think it could be loose bolts on the compressor housing. WIth the turbo I am using now I had to move the compressor and exhuast housing around for it to fit my b18c, now with that in mind, how many bolts are supposed to hold that side on becuase I just have three bolts and a u shape piece of metal holding the compessor side in, does that sounds right?

As far as the downpipe goes, super duper ghetto downpipe, just about a foot long and emptys right by the oil pan.

I havent blocked the inlet on the turbo yet but thats what I am going to do next!

 

There should be 2 u shaped flanges and 6 bolts total. Post pics if you can of the back side of the turbo
And check the piping and wastegate.
Is the waste gate external?
What kind of bolt pattern on the down pipe?

 

6 bolts and 3 brackets. If they are not there you have a boost leak

 

Ohh okay well that would make sense than, it was weird becuase when I first got the turbo on it boosted just fine but after my 3rd pull with the new turbo I heard a pshhh noise and my psi dropped to 0.

I checked the piping and wastegate and they are both still good.

I have a TIAL Vband wastegate that is only 4 months old and have checked that and it seems

I dont know the exact bolt pattern off the top of my head but there is a total of 5 bolts.

 

Okay that would make sense, I am going to check that out later today.

 

Since no one has asked... What spring is in your wastegate.

 

all I know is that with my previous turbo the spring was good up to 25lbs.

Also I just put that other C shaped piece of metal on the other side of my turbo and bolted it in place so my cold side of the turbo is totally bolted down and I took it for a drive and still having the same problem!


Also when I put my hand on the air inlet you can feel it sucking in alot of air but doesnt kill the engine for at least 20 to 30 sec.

 

Than you have a leak in the piping intercooler or manifold.. have someone block the inlet while another listens for the leak

 

Does that mean you have 2 total on there or 3?

 

Okay I was thinking of doing that but its very hard to hear a boost leak with running a 13in downpipe that exits right below the oil pan.

And yes, I only have 2 c shaped clamps

 

Good up to? It either ran 25 psi or it didn't... What manifold are you using and what wastegate? Was this on a stock motor? I highly doubt 25psi if that's the case... It probably just creeps that high...

 

check your wastegate

 

Definitely sounds like a wastegate issue if nothing is loose. Is your bov leaking any air?

 

Okay so update:


So I did a little boost leak down test with my buddy and it was in the dark and was hard to see anything but when we started to blow compressed air into the air inlet to the turbo it would go up to 3psi than drop right away. While doing this, I noticed substantial air coming from the BOV, is that supposed to happen?

You could feel the air just shooting out of the bov, I just cant see that this is right...

 

With the throttle plate closed yes.. Since there's no pressure in the manifold to force the bov closed.you never answered what wastegate and manifold you were running. You need to physically remove the spring and tell us what color it is.
Because when you say good up to 25psi either it creeps that high or it makes 25psi.. There is no between.

You also never answered if this was on a built motor or not

 

Okay, I do apologize about that but I did state what wastegate I was using in my opening of this thread but either way its a V band Tial wastegate that isnt even 4 months old yet. Also the manifold I am running is a drag cast iron manifold. I havent removed the spring yet to see what color it is but I am supposed to be tuned at 18psi but my boost gauge goes above 20 when I get into it and I know thats not safe but it is what it is. so honestly after 20psi I dont know what it goes to.

 

Also bone stock engine, stupid I know but its lasted 3 years so far with this same setup just fine, just ebay turbo before hand

 

Yea creep that high isn't good, especially if you don't know how high.
Do you possibly have a boost controller that wasn't hooked back up?

 

Funny thing, I did have a boost controller hooked up but no matter how many times I twisted it from one side to the other, I would still read the same amount of boost.

 

You have a serious problem. Something is wrong with your wastegate

 

THats what I thought to but if that was the case wouldnt I feel exhuast gas just dump out of the wastegate at idle?

 

No because its probably not opening at all.... Open wastegate no boost
.. Bad wastegate as much as the turbo can make.

 

There is a spring inside the bov to hold it shut. If you had the engine off and air was coming out the bov then that is a problem. As far as the boost creeping it is the crappy design of the drag manifold you have. The best wastegate cannot fix a manifold with poor wastegate placement.