Setting up the BOV the right way.

[dsmkid95]

ok some companies like hks and turboxs make a recirculation kit for our cars but ive noticed that alot of people have theres connecting to there intercooler piping. now which way is better? i dont have an upgraded intercooler or the piping and dont think i can afford it right now but is that expensive to have it welded to your i/c piping.

 

[na_turbotalon]

Where else were you gonna put your BOV? Between the intercooler and throttle body is pretty standard practice.

 

[dsmkid95]

i guess i am confused about this.

 

[2GeNTSi]

Well it looks like you are stock according to your empty mod list so I'll try to explain everything. The stock bov you have (the plastic black one on your upper ic pipe) recirculates, there is a dump tube coming from the bov that goes to your intake pipe. You said you don't have much money to spend on upgrading the ic piping to hard pipes so the only option you have is to get a bov for your application.

You can order the Greddy Type-S for the Eclipse (http://www.extremepsi.com/store/customer/product.php?productid=16191&cat=403&page=1) which comes with the flange and adapter to replace the assembly that the stock bov uses. There are other companies that make bovs with kits to install it on the Eclipse with stock piping like the HKS SSQ but it vents. They make a recirculating kit but it's seperate and that's just more money. I personally would go the Greddy route because it's $210 shipped with everything you need to install it. Some people don't like the sound of the Greddy bov but there's always some kind of trade-off.

 

[evolvingGS-t]

The recirculation that you see with HKS and TurboXS is exactly like your stock set up, but with aftermarket parts.

Hoped that we explained it for you.

 

[oldman]

I think you're asking if you should recirculate back to the intake pipe or to the IC? You typically want to recirculate before the turbo so air will give the turbo a little push and help keep it spool between shifts. I have not seen or heard anyone recirculating to the IC so I can't comment on that.

 

[na_turbotalon]

I think you're asking if you should recirculate back to the intake pipe or to the IC? You typically want to recirculate before the turbo so air will give the turbo a little push and help keep it spool between shifts. I have not seen or heard anyone recirculating to the IC so I can't comment on that.

You would have to recirculate the air to an area that isn't under boost pressure, and after the MAS. The intake pipe is the only spot to do it.

 

[dsmkid95]

i guess this is what i mean. this is a description from a FMIC kit:

Complete front mount intercooler kit. These kits feature a large race core, 2.5" and 3" piping in 304 SS, and include silicone connectors with SS T-bolt clamps. These kits can be customized to fit customer needs, and includes welding of various types of BOV flanges. Various throttle body locations can be accomodated.

what do they mean by this and how big of a difference does this make? i guess i may have worded this whole thing wrong. after looking at the price of i/c pipes i can afford them and i also have my vehicle info updated.

 

[2GeNTSi]

Well the first part in bold means that they can weld on any flange according to what bov you currently have on your car so that you won't have to do any modifications in that part of the install.

The other part I don't understand, unless it's not a DSM specific intercooler kit.

 

[psychlow]

and includes welding of various types of BOV flanges. Various throttle body locations can be accomodated.

This means that they can weld the pipes up to mate up to the throttle body of your car. I don't think this is a DSM-specific kit, but if they customize it right, it'll work.

You have to have the BOV positioned between the turbo and the throttle body. How you do that is up to you, but the easiest way to accomplish this is to attach it to your intercooler piping. If you replace the stock intercooler piping, you usually ditch the piece that your stock BOV attaches to, so you have to figure out a new place to put it.

Just FYI - the goal of a BOV is to vent the pressurized air so that when you let off the throttle and the throttle plate slams shut, the pressure doesn't become insane from the spooled turbo cramming air into a near-closed system. This damages the turbo (and kills your between-shift spool.)

Recirculating back into the intercooler pipe would do nothing but drop the pressure a fraction of a PSI for a split second - not enough to prevent your turbo from dying prematurely. In order to recirculate correctly, you need to dump the air into an area with no positive (gauge) pressure that does not allow the air to escape past the mass air sensor. The only place for this is the intake pipe.