Will changing the BOV cause some tunning needs?
 

I recently removed my emission system and changed the BOV ( blow off valve) to an external air one, so it goes vruuum pshhh.... anyways im having some problems. seems like its not burning right, i dont have the same power i used to. like something its holding it back, a strong smell of fuel is also present. besides checking my sparkplugs, spark wires and fuel lines, what else can i do? is there any tunning needed because of the new BOV?

You're talking about two different things here. The power loss could be due to the emissions delete or if the BOV is leaking. Sometimes after changing the BOV you'll need to adjust your boost controller if the old BOV was leaking.

Make sure you've got everything clamped down tight and don't have any boost leaks. I would predict you probably screwed something up during your emissions removal.

the issue you have is most likely not the bov, but is due to the emissions removal.

adjust what boost controller?

@barkz The stock one is behind the air filter,its a small black box connected to the bov.

Im definetly boosting more than before, I'll try adjusting it.

boost controllers cant connect to a BOV...

thats a pressure sensor. not a boost controller. dont touch it.

The stock valve is actually a CBV (compressor bypass valve) not a BOV (blow off valve). A CBV recirculates metered air back into the intake so that the air-fuel mixture remains as the computer intended it. A BOV vents metered air to the atmosphere, but the engine management computer does not know it, so it still injects fuel assuming that the air is still there. This creates a very rich condition that causes a little bit of bogging or hesitation, but it only manifests when the BOV vents. Most people don't even notice the difference, so I don't think that this is your problem unless you are very sensitive to how well your engine is running.

I would check to see if there is a leak somewhere in the intake piping. It is not uncommon to have forgotten to tighten a clamp after working on the intake system. Have a friend help you with this because one person can't really do it very well.

Another possibility is a leaking BOV. This could be from an installation error, or it could just be that it is not adjusted correctly.

As for the fuel smell, I would check the fuel lines, fuel injectors, and pulsation damper. I can't think of anything else, so maybe a mechanic can chime in with some ideas.

that valve EVIL AVIATOR referred to is often called a "Diverter valve" might help if searching.

Sorry, I didn't clarify. If he is running any sort of aftermarket boost controller. Stock no adjustment would be possible.

i know, just kind of a random suggestion considering he made no mention of any mods. just saying ;)