I recently bought a used Greddy FMIC set-up from a forum member. I had noticed that he, or someone else, had tapped and welded a Blitz BOV on the hot side pipe coming off of the turbo. I am guessing it's called hot side because the air is hot on this side coming from the turbo and the air on the other side is cold, or atleast somewhat cold, from the air passing through the intercooler core. Anyway, I have seen most people's set-ups with the BOV mounted to one of the cold side pipes, a little before the PS rack I think. Is there a reason he may have mounted it on the hot side?

Also, the nipple on top of the BOV... where does that line connect? (From the BOV to:________)

 

The hot side of a turbo is the turbine side which rides in the exhaust the entire fresh air portion is called the cold side.

The BOV can be on either side of the inter cooler, most stock turbo vehicles (in fact every single one I have ever worked on), including at least the FD (I have never worked on an stock T2) have the BOV or bypass valve which serves the same function before the intercooler.

The line from the BOV can go to any of the nipples after the throttle body which will see vacuum (when in vacuum), they are usually hooked up to the ones on the runners of the UIM.

 

Alright, I appreciate the time it took you to type this information out for me slo. I understand this a bit better now. Some people love that "Search" function... you know, because it works sooo well. Anyway, thanks slo.

 

this is where i mounted my BOV
its a Greddy TypeR

 

Wow, nice looking set-up you got there.

 

Thankx.
its taken five months and alot of cash

 

In theory, the BOV should be mounted as close to the throttle body as possible. This prevents the piping ahead of the BOV from emptying on shift and provides slightly better response.

In practice, I don't think it matters one bit.

 

im lovin the 4" intake. might as well box it off a bit and run a headlight "scoop" into it. thats what ill be doing with mine when i get it back. right now i have it positioned where the washer fluid bottle should be. haha



and my bov is here.... PO installed it, and i dont care enough to move it.. ha

 

Some say near the throttle body for the best results. But I think the difference is VERY minimal and wouldnt affect anything on either side. People say closer to the turbo, the louder it will be. Closer to the throttle body, the more effective itll be.

BTW R-Kive, VERY nice setup you got there. It looks really clean.

 

Yes I also thought closer to the throttle is better.
But in my car I experienced a little compressor surging,
when I moved the BOV from behind the turbo to before the throttle.

I dont know if the surging was critical but I didnt like it,
so I added the stock internal bypass valve to the position behind the turbo
and the inlet and the surging was gone.

-Patrick

 

But then you are more likely to encounter the dreaded compressor surge.

My understanding is, put it on the hot side if you are concerned about your turbo charger and compressor surge. Put it closer to the throttle body if you want overall performance.