New Turbo, No Boost, what gives

[Mr. Spool]

I just installed a new t3/t4 turbo and I am getting no boost, I think at one point I might have hit 1 lb but that is it. my set up includes kat with a log manifold and a tial wastegate.

by the way I used some of that spray on gasket sealer and some got inside the waste gate, could this prevent it from opening or closing. thanks.

[TheSparo]

well it would keep it from closing, which would make you build too much boost, unless they have a feature where they are open unless seeing pressure?
dunno man

[kidinthehall]

hmmmmm, TiAl wastegate? im willing to bet that you or whoever installed it may have forgotten to put in the seat for the valve in the gate.

[Mr. Spool]

It was already installed on the manifold. and I never removed it. however It was removed from the wastegate dump pipe, Could I have forgot something when I reinstalled it?

What else could cause a turbo to not create boost? my vacuum sits at negative 20 then raises to 0 but thats were it tops out. Could there be any problems with the turbo itself.

[orion::S14]

I'd also guess the wategate is staying open...maybe the missing ring gasket..? Who knows.

Or the wastegate valve is stuck open b/c you got copper spray on it..???

You need to pull it off and check it out.

- Brian

[Bbandit]

what wastegate spring do you use on the wastegate?
zero psi spring? jk

mine was boosting only 2.5psi before I installed my MBC (Im running 4 psi spring)

[UcanTry]

i had the same problem, and it was the wastegate, more then likely thats your prob

[Mr. Spool]

thanks for the imput, so basically, even if the turbo was bad it would still produce some sort of boost? So when I pull the wastegate off what should I look for? should I be able to move the shaft that I can see from the dump side, thanks.

[Mr. Spool]

what is the ring gasket?

[fastpace]

i just took some picks of it on my imagestation host site. it should be towards the end of the pics. it bascially stops premature air from leaking out of the wastegate.

http://www.imagestation.com/album/?id=4286423543

[Mr. Spool]

should I be able to move that valve when it is off the car or should it be pretty firm. by the way thanks for the pics.

another question for you, should the spool up be dramatically louder than an ihi. thanks.

[Mr. Spool]

I pulled of the dump pipe and stuck my fingers in there, it feels like it is closed, and I cant make it budge. is this how it should be?

[Mr. Spool]

there is also a second hole on the exauhst side of the turbo, am I supposed to seal this some how or should this not matter? I just used the copper gasket on this as well.

[kidinthehall]

uhhhhhh...........2nd hole on the exhaust side? As in, the turbo was setup for INTERNAL wastegate? you need to have that welded shut. It should have a flapper door over it.

[JtWo]

a hybrid turbo? sorry to go offtopic but what a/r?

[Mr. Spool]

It was set up to be either internally or externally wastegated, there is no flapper there, it is just an empty hole. could this be causing the turbo not to spool or create boost? I thought about just perchasing an downpipe gasket to hopefully keep the hole from leaking.


and yes I believe it is a hibrid.

[fastpace]

Originally Posted by Mr. Spool

should I be able to move that valve when it is off the car or should it be pretty firm. by the way thanks for the pics. another question for you, should the spool up be dramatically louder than an ihi. thanks.

well it really depends. what is the spring rate of the spring you have? a 4 pound spring was pretty easy to push up on bbandit's tial wastegate, but mine is kind of hard to push up on the valve with a 6 psi spring, but i also have a different wastegate.

i don't know the difference between the spool up of your t3/t4 compared to an ihi turbo, there are alot of factors that play a roll. do you know the specs of the two turbochargers?

[Mr. Spool]

when you say push up on it, do you mean that when I reach in from the dump side, and I should be able to flip the valve open, so it just pivots?

[fastpace]

not really flip the valve, but as you apply pressure to the valve it puts a compressible force on the spring that should open the valve.

the only thing that i can think of something flipping back and forth is a flapper valve that is used for an internal wastegate. Is that flapper valve still attached to the turbine side of your turbo?

[Mr. Spool]

the turbo did not come with a flapper valve, it only came with the hole for a flapper valve. do I need to seal that hole some how?

How do I tell if the wastegate is bad.

[Mr. Spool]

the turbo did not come with a flapper valve, it only came with the hole for a flapper valve. do I need to seal that hole some how?

How do I tell if the wastegate is bad?

is there a way to tell if the turbo is bad?

[kidinthehall]

Originally Posted by Mr. Spool

It was set up to be either internally or externally wastegated, there is no flapper there, it is just an empty hole. could this be causing the turbo not to spool or create boost? I thought about just perchasing an downpipe gasket to hopefully keep the hole from leaking.


and yes I believe it is a hibrid.

Yes...... the big gaping hole in the exhaust side is your problem. have it welded shut if you are using an external gate.

What were you thinking a downpipe gasket was going to fix? im confused on that.

[Mr. Spool]

I did not even use a down pipe gasket. so even with the flange covering both holes I will still leak. and just a gasket will not fix it? I need to actually form a piece of steel to fit in the hole and seal it all the way off?

[kidinthehall]

no, all a gasket is gonna do is prevent exhaust from leaking out the turbine outlet past the downpipe, making an exhaust leak. whats happening to you is that the exhaust is basically bypassing the turbine wheel and taking the easiest route out...............through the open hole, and into the downpipe. its basically acting as if your WG was 100% open all the time. If im understanding what you're describing to be the case at least.

If this is really how things are, you really need to get a better understanding of exactly how things work before you put them on your car, or its gonna live a very short, hard life.

[Mr. Spool]

the down pipe flange, is the 5 bolt style and covers both the open hole and turbine hole. I then sprayed copper gasket over the downpipe flange. I figured that would be enough to cover the open hole. Is this what you have pictured, if so how should I go about plugging that hole?

also when I am running the car at idle it sounds normal, but when I put load on it I get a high pitched noise that gets louder the closser to 0 vacume I get. and 98% of the time it stops at zero and then once in a while it keeps going up to as high as 2 1/2 pounds.

If you need any more info let me know.

[Mr. Spool]

by the way the open hole is being covered by the 5 bolt flange and is not open straight into the down pipe.

[Mr. Spool]

how do I go about blocking the wastegate hole?

[kidinthehall]

take the turbo off, take it to a welder and tell him you want the hole beside the turbine discharge welded shut. simple as that. im not sure how you figured it was going to seal it off by doing what you did, theres still a 1/2" or so of dead air between the hole and the flange for your downpipe.

the whistling you're hearing is the turbo attempting to make boost. you also may want to check your plumbing for vacuum/boost leaks, make sure you dont have any nipples uncapped etc. take your time.

[Mr. Spool]

Thanks for the imput, I just took it off to weld it shut, to my dismay, I grabbed the shaft and spun it just for giggles and what do I find, the shaft wiggled back and forth slightly, I then checked even closser, and the intake side is rubbing ever so slightly, I am not quite sure what shaft play is, but I am sure this is it. if I am wronge let me know. but I am pretty sure my brand new turbo is junk.

please let me know if I am right about this. thanks.

[TheSparo]

it moves back and forth or side to side?