Car will not make boost. Need some help

[Sprayer84]

The other day I was out doing some logs for Lito. Everything was going great but he wanted me to lower the boost until we got the tune more dialed in because I'm still on my stock plugs. I was at 9psi but decided to bypass my tru-boost and just run wastegate pressure for now. I unhooked the boost solenoid and ran a line direct to the wastegate. During my log my boost skyrocked and triggered the alarm so I let off. When I got back to the shop I noticed I put the wrong line into the compressor housing. I accidentally ran my boost reference to the top port on the wastegate. After putting it right it will not build any boost.

If the wastegate is unhooked from both ports and the compressor port is blocked it will build about 8psi. If the compressor port in run to the top of the wastegate with the bottom port open it goes as high as you'll let it. Smoke test didn't reveal any leaks

 

[JoshK]

To run just gate or spring pressure, you need to run a line from the compressor to the bottom port of the wg.

Completely elimate any lines going to or from the EBC until you have it figured out.

 

[Sprayer84]

To run just gate or spring pressure, you need to run a line from the compressor to the bottom port of the wg.

That what I thought. But when I do that now I cannot get more than .5lbs of boost

Completely elimate any lines going to or from the EBC until you have it figured out.

That's what I was thinking too

 

[JoshK]

No leaks in the hotside or coldside?

 

[mikeyfitz]

Sounds like a cold side leak.

Check all your piping in cold side. I had a issue with mine blowing off the piping from the turbo to the cold side.

Weird that it happened when you said it did, but as long as you have your line from the compressor to the bottom port of the WG you should be fine.

 

[Sprayer84]

I hooked my smoke machine up to it and got no leaks. I'd think I would hear a hot side leak that large. The turbo still seams to spool pretty loud. And without anything on the wastegate it will build 8ish lbs

 

[Sprayer84]

Tech needs a forced induction section

 

[Stinger]

There are only a few possibilities here and most of them have already been covered. A boost leak is the most likely culprit. A stuck wastegate is another possibility, though it's not very likely. Since you say you can unplug both lines to the wastegate and only get 8psi, that almost certainly points at a boost leak. Reason being, you should get 20+psi in that configuration since there is nothing to open the gate in that configuration.

 

[Sprayer84]

Wouldn't it have to be a pretty large leak to make zero boost? Not even 7psi. None of the couplers are off. I'd think that smoke would find a leak of that size.

 

[JoshK]

I would check the wg next then

 

[Sprayer84]

I would check the wg next then

That's what I was thinking but everyone is telling me wastegate failures only lead to over boost

 

[one eyed willy]

What spring is in the wastegate?

You have it hooked up correctly, compressor to the lower port on the WG.

That means it will open based strictly off of spring pressure. So what spring?

Exhaust pressure will push the WG open even with nothing hooked up to ot if you have a small spring in there. You can have 15-30 psi in your hot side depending on your back pressure....which will push the WG open.

The fact that you had it hooked up backwards and it made alot of boost should tell you , you don't have a leak.

 

[Sprayer84]

What spring is in the wastegate?

You have it hooked up correctly, compressor to the lower port on the WG.

That means it will open based strictly off of spring pressure. So what spring?

Exhaust pressure will push the WG open even with nothing hooked up to ot if you have a small spring in there. You can have 15-30 psi in your hot side depending on your back pressure....which will push the WG open.

The fact that you had it hooked up backwards and it made alot of boost should tell you , you don't have a leak.

It is suppose to be a 7psi spring. But it build zero boost when hooked up correctly

 

[ctt326]

Something doesn't make sense. Where is your source coming from that you have hooked up to the WG?

Like one eyed willy said, seeing a lot of boost when it was hooked up incorrectly means you don't have a boost leak. If your vacuum source is hooked up correctly the only place for there to be something wrong is inside the wastegate.

 

[Sprayer84]

It is a straight, 1pc, brand new silicone hose from the compressor housing to the WG

 

[one eyed willy]

So just so I got this right....

After the boost spike with it hooked up incorrectly, it no longer makes boost?

Sounds like the excessive boost popped a pipe off somewhere.

 

[Sprayer84]

So just so I got this right....

After the boost spike with it hooked up incorrectly, it no longer makes boost?

Sounds like the excessive boost popped a pipe off somewhere.

I thought the same but after hooking up my smoke machine I found two small leaks. BOV and intercooler coupler leaking from one end. Repaired both leaks with no change.

 

[one eyed willy]

Does the car feel like its making boost at all or does it feel just normal? Possible the boost gauge hose popped off?

 

[Sprayer84]

It's a tru-boost. Still reads vacuum, gets to about .5-1 and that's it. I can hear it spooling but the boost never comes

 

[ctt326]

Ok if you hear it spooling then you either a.) have a leak somewhere in the coldside or b.) the wastegate is dumping all of it.