Will venting the BOV affect spool time?

[jawar666]

Ok... First, this is not the typical question about venting the BOV to the atmosphere...

I am just looking for a reasonable answer about how venting the BOV in an unproper way might affect spool time?

I think spool time is directly affected by exhaust gases... so how intake air being released to the atmosphere might affect spool time???

 

[McFox]

I'll start by saying I'm not entirely sure of what you're saying but I'm going to give it a shot.

Like you said the exhaust basically powers the turbo. The exhaust gas turns the turbine side of the turbo. This allows the compressor to compress the air on the other side of the air. Generally it then runs through an intercooler. Most BOV's are located after the air has been fed through the intercooler.

So no, venting your BOV is not going to do anything to spool time. By the time the air has gotten to the BOV the turbo has already spooled up. Does that answer your question?

 

[absolute_DSM]

Subscribed, I have heard the same thing OP.

The only thing I could see affecting spool time would be the 20 PSI + of air coming out of the bypass valve aimed directly at the compressor, hence the turbo not having to "suck" the air from the filter, its already there.

 

[snowborder714]

The way venting in general affects spool time is that you do not have that recirculated air hitting the turbine through the intake pipe. Whenever you let off the gas, the pressurized air in the upper intercooler pipe hits the throttle body plate and has no where to go so it gets let off by the blow off valve. And since it's recirculated back into the intake pipe, it forces air into the turbine and through the compressor housing, which it turn helps a little bit to keep the turbine spinning.

Between venting and recirculating, I really doubt if you can tell that much of a difference in spool time. Especially if you have a bigger turbine, it's going to take longer and a lot more air than a stock turbo to spool.

 

[oldman]

It will also increase your spool time because every time you blow off, you're flooded with extra fuel causing the system to bog/stumble and reduce the engine output until it recovers itself.

I think your question has been answered, we really don't need another venting thread. My opinion is, improper venting is for wannabes.