VTA Mod: Two Days and Back to Stock

[xrocket21]

Nobody’s making anything up.

https://www.vividracing.com/blog/bov-vs-bpv-whats-the-real-difference/

“In theory, this would lead to poorer throttle response and more turbo lag, but on many vehicles, the stock turbocharger is as small as it can be to meet the manufacturers power goals. With a tiny turbocharger you have superb throttle response and almost no lag, and adding a BPV spacer is unlikely to make any noticeable difference. ”

again, we said it’s minimal if even noticeable, but certainly not made up.

So, then most racecars, who look for every possible advantage, pipe the bov back in?

As far as I know most every modified car vents to atmosphere.

 

[ddubdb3]

These turbos are tiny... having a recirc BOV you will literally never feel the difference in lag vs a VTA BOV. These aren’t race cars so on and off throttle response won’t be needed either your not banging through gears like a manual trans vehicle or trying to pedal your way through a corner. These mods or no mods are purely noise and emissions related. In my case I definitely went turbosmart BOV and intake cause I love turbo sounds and it helps mask the terrible v6 exhaust note lol


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[xrocket21]

These turbos are tiny... having a recirc BOV you will literally never feel the difference in lag vs a VTA BOV. These aren’t race cars so on and off throttle response won’t be needed either your not banging through gears like a manual trans vehicle or trying to pedal your way through a corner. These mods or no mods are purely noise and emissions related. In my case I definitely went turbosmart BOV and intake cause I love turbo sounds and it helps mask the terrible v6 exhaust note lol


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Ive always said the key to making the truck sound good is an intake and a BOV, not an exhaust. Highlight the TTV6, dont try to make it sound like a V8. I think that's why this post bugs me.

 

[PorterW1111]

Ive always said the key to making the truck sound good is an intake and a BOV, not an exhaust. Highlight the TTV6, dont try to make it sound like a V8. I think that's why this post bugs me.

Anytime I hear a gen2 trying to make the exhaust “sound good” hahah


Sorry had to, it’s just too good...

 

[xrocket21]

Anytime I hear a gen2 trying to make the exhaust “sound good” hahah


Sorry had to, it’s just too good...

The Ford GT v6TT sounds great, a VW Vr6 sounds incredible, even the Nissan V6 sounds great in the 350Z, but the Raptor just doesn't sound great in the exhaust department.

 

[isis]

So, then most racecars, who look for every possible advantage, pipe the bov back in?

As far as I know most every modified car vents to atmosphere.

Most big turbo cars do get surge with a recirc. That’s covered in the link and all over as well.

i also agree with a later post that said you wouldn’t notice it likely. It’s just not a made up thing. It’s physics. Your perception is not.

 

[isis]

These turbos are tiny... having a recirc BOV you will literally never feel the difference in lag vs a VTA BOV. These aren’t race cars so on and off throttle response won’t be needed either your not banging through gears like a manual trans vehicle or trying to pedal your way through a corner. These mods or no mods are purely noise and emissions related. In my case I definitely went turbosmart BOV and intake cause I love turbo sounds and it helps mask the terrible v6 exhaust note lol


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Still not emissions related. Either one. Unless you think the engineers solely use this setup to prevent PCV gasses from being VTA. That’s maybe a decent consideration. But c’mon. That’s as far fetched as making a turbo spin with air.

 

[ddubdb3]

Still not emissions related. Either one. Unless you think the engineers solely use this setup to prevent PCV gasses from being VTA. That’s maybe a decent consideration. But c’mon. That’s as far fetched as making a turbo spin with air.

Well as far as a emissions sniffer goes no it makes no true effect on what comes out the tailpipe. Visual yes. Anything produced by the motor including “boost” needs to be “scrubbed” by your converters. I suppose you can think of it like a PCV system except it’s just boosted air instead of blow by gasses


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[isis]

If you look at the plumbing on most turbos you’ll see the PCV after it. So while the vented air isn’t fueled yet, or slated for fuel like a MAF setup, it did pull oil vapors from the crankcase. So my earlier mention that it is zero emissions related may be dismissing a tiny thing. Similar to someone saying moving from BPV to BOV may be losing a bit of spool going on throttle right after a pressure release/divert. It’s all so minor In real life but we can argue all day about principles if we want to.

 

[xrocket21]

If you look at the plumbing on most turbos you’ll see the PCV after it. So while the vented air isn’t fueled yet, or slated for fuel like a MAF setup, it did pull oil vapors from the crankcase. So my earlier mention that it is zero emissions related may be dismissing a tiny thing. Similar to someone saying moving from BPV to BOV may be losing a bit of spool going on throttle right after a pressure release/divert. It’s all so minor In real life but we can argue all day about principles if we want to.

There's no way in hell an OEM could get away with atmospheric PCV venting. All vapors are piped back in to be burned. Emissions aren't just what comes out the tailpipe.