Just instaaled a new PCV System and CAI (Back Firing'n More)

[Lukezen27]

Hey Guys

I just installed the PCV system and cold air piping and now my cars ****ed//






Now my cars back firing and spluttering at high RPMs

I've backed off the boost to about 8psi but its still happening..

Anyone got any idea?

Thanks

[beeza]

Subscribed!

[bennjamin]

try looping it to the OEM route (blue pipe goes back to the inlet manifold) and see if that helps

[[ricer]]

i had the car set up like this apart from the moroso thingy u got going on and it was fine

is there a one way valve in it or something? maybe the hoses are hooked up wrong

[TODA AU]

Can we have a better photo of what you've done?
Of note per your description, both pipes will vent to the turbo intake,
No air will enter the engine & flow through as your diagram predicts.
There is no manifold vacuum to facilitate this.
My thoughts on what you've done so far,
I would add the female 3/8NPT weld on to the tank as discussed,
+ Fill the tank with fuel proof foam (I have some at the shop if you need some)
+ fit a 1 way vale & drain back to sump on bottom,
Remove the PCV valve, replace with a straight through union,
Vent the rear of engine & rocker cover to Morosso tank,
Top of morroso tank back to inlet of turbo.

Before you go any further, check nothing silly has occured like the vacuum line from the fuel pressure regulator has come off etc...
Any recent changes to plugs or leads?
If everything is all good,
Is there any smoke when the missfire occurs?
Is it a lean missfire or rich?
Lean is a sharp crackle rich is a deeper sound....
(Unfortunatly that's a hard one to explain without actually showing you)

Also, since you've been playing around near the thermostat... (other thread)
The earth there is the main ECU earth,
Just check it's tight.

[TODA AU]

That's because the red line in your diagram should be under pressure from the outlet in the rocker cover so pressure from the engine crankcase goes out and into the intake. The way you have it set up now it's seeing VACUUM not pressure. Hook the blue line from the rocker cover to one side of the catch can and discard the purple line altogether. It should be rocker cover port, catch can, engine port, no need to go to the intake at the turbo. Make sure the dry sump can doesn't have a valve in it so air can come in or go out either side. Make sure you have a stock PCV valve at the intake manifold port. Your car is running farked up because it's WAY LEAN do not drive until you fix it.

Just some background,
The original can we supplied was suposed to vent to atmosphere,
But Luke being Luke wanted full compliance with his engineer's report, hence the vent to inlet of turbo.
The can is just a generic morosso dry sump breather tank.
There is no valve inside, only a simple tube + double sliced welch plug baffle system to vent out the top.
We genereally add fuel proof foam & the one way drain back for zero greif.
This solves even the heaviest of breathing engines.
I agree though, it's unlikley the catch can is the true culprit here.
The engine is now running lean or rich (likley lean as you say) somehow.

[Lukezen27]

try looping it to the OEM route (blue pipe goes back to the inlet manifold) and see if that helps

Swapping over the two pre-intake ones works but that's not how it should....

[TODA AU]

try looping it to the OEM route (blue pipe goes back to the inlet manifold) and see if that helps

No...
This will fill the sump with boost...

It would be purple to intake manifold, but the PCV would need to be between the tank & the manifold.

[Lukezen27]

If I unplug both pipes for the re-intake it all works fine

Maybe I should put a PCV one way value back in the PCV port?

[Lukezen27]

Here's a few more photos









Goes
PCV Valve to side barb in catch can (PCV Valve is hollowed out)

Top can bard to pre-turbo intake piping with the bard on the piping facing to turbo (vacuum)

Rocker cove to pre-turbo intake piping with the bard on the piping facing to air filter (pressure)

[[ricer]]

is the hose from the can to the block squashed or just looks like it is on the photo?

[Benson]

looks right from the pics.