So vta smoke...

[Tucsonturbos]

Just figured I post finding to the forum on my vent to atmosphere pcv setup. I still get smoke on start up now and then and randomly at intersections. It's not a daily thing but more or lessomething once a week I see it in my mirrors. My pcv is gutted and runs to a catch can on both clean and dirty side. I've had this setup for a couple months now to examine. Unfortunately to me it sounds like the stock turbo is not sealing well enough and let's oil though by nature. I run a custom 3" catless turbo back so there's almost nothing to mask it. Figured ide let the forum know since no one really runs vta and uses sealed catchcans/heavier masking exhausts that this still happens weather they know it or not.

Bottem line, stock turbo is an issue with smoking.

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[Brian V]

Just a thought . You might want to clean out your intercooler and piping or atleast take an inspection tour of these components to verify your findings .

 

[Tucsonturbos]

Just a thought . You might want to clean out your intercooler and piping or atleast take an inspection tour of these components to verify your findings .

Thank you, forgot to add that charge pipes were changed and intercooler was checked/cleaned when vta pcv was done. Only source of residual oil wouldve been in the intake manifold.

 

[Kuronos]

Just a thought . You might want to clean out your intercooler and piping or atleast take an inspection tour of these components to verify your findings .

What would be the best way to clean intercooler out? Take it off car and spray it with degreaser?

 

[Brian V]

Acetone ...this solvent will evaporate leaving the intercooler pristine ..
Remember this is a highly toxic solvent , so do not breath in this solvent while cleaning the intercooler and this should be performed in the open air . Outside ............

 

[Brian V]

Just figured I post finding to the forum on my vent to atmosphere pcv setup. I still get smoke on start up now and then and randomly at intersections. It's not a daily thing but more or lessomething once a week I see it in my mirrors. My pcv is gutted and runs to a catch can on both clean and dirty side. I've had this setup for a couple months now to examine. Unfortunately to me it sounds like the stock turbo is not sealing well enough and let's oil though by nature. I run a custom 3" catless turbo back so there's almost nothing to mask it. Figured ide let the forum know since no one really runs vta and uses sealed catchcans/heavier masking exhausts that this still happens weather they know it or not.

Bottem line, stock turbo is an issue with smoking.

You have changed the backpressures with the 3" catless turbo back exhaust ..
This will change the velocities of the back pressures ..intake valves may become affected by these velocities .

 

[Tucsonturbos]

True, but look try and find a 2.25 or 2.5 aftermarket... any turbo platform for gas engine a 3" downpipe is standard mod. Most stock turbos have no issue but saying a turboback exhaust cause issues is BS, it's poor sealing. There's so many people here with 3" downpipe but bunch of muffler/res that it masks it. You have to remember baffled mufflers act like a catch can for smoke, it may be there but you may not know.

 

[Tucsonturbos]

And please explain how intake valve will be changed...? Not being a dick just curious

 

[Brian V]

The velocities of the backpressures have changed from the oem allowances engineered into a head and valvetrane assembly ..it is the velocities we are more concerned with ..as I stated these velocities May affect the intake valves ..there is another concern with your theory .. the Direct Injection .

 

[Tucsonturbos]

Very true however I'm concerned with the turbo. A mild dropen in backpressure shouldn't change the sealing on a well built/designed turbo. Valve train wise there's always going to be minute contamination but with direct injection you don't get the valve cleaning perks. This will happen in any DI engine. The thing I'm having an issue with is if less backpressure causes intake valve problems because it flow more free flowing in your words wouldnt contamination be less? Either way port injection as a secondary injection source is the way to go.

 

[Brian V]

You are interesting Tuscon !

At this time I think we should consider your theories about the oem turbo having seal flaws in design as the other theories are of a alternative theory and only hinder the equation to satisfy your speculative hypothesis ..

If in fact your ideas of the turbo are correct . What should we expect to find if we were to dismantle the oem turbo at this point in time and examine it ?

 

[Weather Man]

Just figured I post finding to the forum on my vent to atmosphere pcv setup. I still get smoke on start up now and then and randomly at intersections. It's not a daily thing but more or lessomething once a week I see it in my mirrors. My pcv is gutted and runs to a catch can on both clean and dirty side. I've had this setup for a couple months now to examine. Unfortunately to me it sounds like the stock turbo is not sealing well enough and let's oil though by nature. I run a custom 3" catless turbo back so there's almost nothing to mask it. Figured ide let the forum know since no one really runs vta and uses sealed catchcans/heavier masking exhausts that this still happens weather they know it or not.

Bottem line, stock turbo is an issue with smoking.

Is the return line on the dirty side catch can wet or dry? If you are certain it is dry, you may have a seal issue on the stock turbo.

 

[Tucsonturbos]

Is the return line on the dirty side catch can wet or dry? If you are certain it is dry, you may have a seal issue on the stock turbo.

There is no return line because it is vta (vent to atmosphere) both pcv intake ports are capped and the catch can outlet is a breather.

 

[Tucsonturbos]

You are interesting Tuscon !

At this time I think we should consider your theories about the oem turbo having seal flaws in design as the other theories are of a alternative theory and only hinder the equation to satisfy your speculative hypothesis ..

If in fact your ideas of the turbo are correct . What should we expect to find if we were to dismantle the oem turbo at this point in time and examine it ?

I have no clue! My best guess is that the piston ring on the exhaust housing side is too thin, giving oil and easier time getting through. When people switch to bigger turbos theyre upgrading to a more durable turbo. What i would definately love to learn is what the stock turbo has for oil pressure vs aftermarket kits. The stock turbo oil pressure may be able to work a restrictor in the feed line just enough to stop smoke completely

 

[16COEBM]

What are backpressures?

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