Surging since changed intake manifold?

[VR4GOTTI]

i recently changed my intake manifold from a duel runner vr4 cyclone one , to a n/a galant one and ive had a issue when you go to boost it kind of like wants to go but something is stopping it , it will boost but it like lags now now im using the vr4 throttle body still and using a 3inch air intake pipe to my vr4 turbo and vr4 afm

any help please cheers ?

 

[GeoKez]

Check your wastegate & vacuum connections are right. Sounds like it might be open.

 

[evo-gsr]

Im with George...make sure all your hoses/pipes and stuff are all connected / plugged in.

 

[VR4GOTTI]

cheers mate


does it matter if im running the air hose from the rocker cover to the air intake pipe to afm?

 

[GeoKez]

:-/ Jamo.....

 

[evo-gsr]

The pipe from the rocker to the intake draws the oil vapours from the head and recirculates them back through the system. There are arguments for and against this idea...
Just tap a hole into the intake pipe and put a nipple on it so you can use it...Im guessing your intake doesnt have the nipple which is why your asking?

 

[GeoKez]

Ok I understand now. Wouldn't the 'dirty air' from the rocker cover contaminate the afm if it was plumbed in before it? And no, I don't understand how this plumbing would influence the problem you described.

 

[evo-gsr]

Its usually plumbed in after the AFM George....to eliminate that problem.
And yeah...George is also right in saying that would have no influence on the problem you mentioned before.

 

[4piknup]

Agree. The air has been measured by the afm so it must port in after the afm. When you have manifold vacuum the engine sucks the 'dirty air' past the 1way valve and into manifold. When boosting the 1way valve is shut and the air goes into the intake, pre turbo.


Gotta boost test your new manifold, bet its leaking air

 

[VR4GOTTI]

my air intake to afm has a nipple on it put will run with a different pipe and see if it makes a differnce? and i will check my intake manifold to cheers

 

[evo-gsr]

Yep..boost leak test is a must...you will be amazed what you find....you can make one for under $10 too.

 

[4piknup]

I have a thread here somewhere that I started with my $3.50 boost tester. Looks like you could smoke ganja with it...