I'm just trying to get an idea of how most people have there vacuum line running off there BOV. I don't really wana use a vacuum block and i just went out to see where i could possibly hook it up on the intake manifold itself and couldnt really find a place. i know you can run it to the vacuum hose for the brake booster but i plan on running my wastegate to that so i just wondering what options i had left. thanks for any info!!

also, any recommendations on a good BOV? I have one but its some off brand one soo i dont really wana use it. thanks!!

 

your wastegate should be ran off your compressor for best results.

 

can you explain that a lil more please? this is my first forced induction build so im on the noob side of the fence if ya know what i mean

 

Its good for the BOV to have its own vacuum source. if your boosting then its best to be running a crankcase ventilation system and getting rid of the pcv system. by doing so you will have the port ont he front of the intake manifold to use for the bov. the wastegate can be ran to the intake manifold but some say its better to run then directly to a fitting on the compressor housing of the turbo so you dont have vacuum going to the wastegate as it really only needs a boost source

that being said whatever your wastegate spring is expect to see 1.5-2psi less boost in the manifold if you run the pressure source from the turbo to the wastegate

 

in other words, your suggesting i run a catch can setup so i can use that port on the intake mani for my BOV. Thats good advice...

will a 1.5-2 psi drop at the manifold occur if i run my wastegate off my intake manifold? rather than the compressor housing of course

 

I run my wg to my turbo compressor and It works fine. Hits whatever psi my spring is solid with no creep.

 

What intercooler are you running? a good intercooler there should be a psi drop by running WG to the compressor housing unless your manifold has poor wg placement then yes you will see the same boost level as the spring in the manifold.

and yes if you run it to the intake manifodl you will see spring rated boost pressure int he manifold

typically cheaper intercoolers like ebay units will see same boost pressure reguardless where you put the boost feed to the wastegate. i know on my precision 600hp intercooler with my wastegate connected to my compressor im seeing 1.5 psi in pressure difference in my manifold

 

its an XS power intercooler, its ****in huge.

so yall just drilled a hole in the compressor an tapped it for a fitting to run a vacuum line from it to the wg?

 

Thats not good, bigger is not always better.

 

ok welll, it might not always be better but could you explain why it'd de a downfall? i mean its not like extremely huge its just bigger than them little ones you see that come with them e-bay kits.

 

bump

 

Because the air speed ends up being too low, and the boundry layer is too thick. Boundry layer = slow moving skin over internal surfaces metal = hard to x-fer heat through it. Combine that with the super-low fin density in cheap FMIC's, and you get far less heat transfer.

You can *try* to run the BOV off a tee'd source, but I've seen far more problems than it's worth. $20 for a vac manifold is by far an awsome deal to prevent problems that you'll likely see. Even 2 brass tee's connected together will make a decent enough vac manifold for all of $6.


FYI at the level most Hondas push their turbos, you won't see much pressure drop at all. It's only when you do something like combine a larger 2.5L motor and a pea-sized turbo with a undersized top mount IC that you'll get noticable pressure drop.

 

aight word well im atleast gonna try it and see how it works out for me, the intercooler anyway. im going to run my bov vacuum feed off of where the pcv valve once was in my manifold and run a catch can setup to eliminate the pcv. i reckon ill run my wastegate off my compressor side if thats what everyone recommends. just wana make sure what i do is just drill and tap a whole in the compressor housing and run a line to it from there to the wastegate?

 

also does anyone know what type of fittings are used in the valve cover for the catch can lines and where i could get them from? i work in a car quest but i dont see anything available that big.

 

bump

 

most people weld -10an fittings and run stainless lines.