My buddy and I were talking the other day about where the best location for the bov would be. I said after the intercooler he said before the intercooler. What is the best before or after?

 

I did before intercooler because space was at a premium for me. I have never had a problem and have run it that way for quite a few years...


Ken R.

 

Doesn't really matter if it is before or after since the system is pressurized and needs to vent.

 

I say before. Why heat up your intercooler if you don't have to?

 

...huh?


Put it after, as close to the throttle blade as possible. The further you put it from the throttle the more the air will have to reverse direction to vent.

Before the I/C will theoretically crack the valve slightly harder and prevent compressor surge better, but it won't surge anyway with the BOV near the throttle blade, so you're not gaining anything.

 

Is it safe to assume the air coming from a blower or turbo is hot or at least warm?? When you need the cooling advantages of the intercooler wouldn't you like it as cool as possible

This I have to disagree with. I have my BPV ( a big Vortech Mondo) right on the curve of the elbow going to the TB and I think it is causing my rich problem I've been chasing for a while. The idea is that it is causing probs with the IAC and is starving the motor of air when the throttle blades are closed or near closed on an system that already starves cylinders for air. Will moving it fix things?? Dunno but hope so. All my opinion of course.

 

The heat comes from compression, not from simply passing through the compressor. The difference is probably essentially immeasurable.

Putting the BOV on the elbow is a bad location. It's going to cause a huge amount of turbulence on the outside radius of the elbow. Air has mass, when it moves through a pipe and changes direction while moving quickly it crowds the outside radius.

Also if you're running in MAF mode your rich condition is because your dumping metered air since the BOV is after the MAF.

 

It is a bypass valve as above.

A buddy of mine has it vented to atmosphere (no inter/aftercooler at all) after a G trim blower. The air won't burn your hand but it is warm. Before or after, up to the user.

 

Well mike if I was going to move my bov in the location you suggested I would need to re route all my piping. My MAF is toward the bottom of the inlet pipe before the TB. So I would need to move it up toward the TB and then put the BOV next to the TB.

 

You want the MAF between the BOV and TB. If the BOV is after the MAF, you will get a rich condition when the BOV opens.

 

Realquick that's why I was saying if I had to move my BOV I would need to re route my pipes to get the MAF closer.