VTA Mod: Two Days and Back to Stock

[KAH 24]

I ordered the billet plug for the VTA mod and installed it Wednesday morning. After 2 days, the whooshing sound novelty got old—so back to stock I went just a few minutes ago.

Positives:
1. Easy to install: 15 minutes max as I’m slow and took time to zip tie the hose/doodad to keep it from flopping around). My reason against removing the hose was to return it to stock each time I went to the Ford dealer for an oil change/service.
2. For those who like the whooshing—good deal I suppose.

Negatives:
1. Small chance of warranty issue: I’m still under the 3/36 B2B and 5/60 powertrain (and purchased the 5/100 MaxCare B2B warranty which starts when my factory ends). Call it peace of mind.
2. The whooshing sound which made me feel like I was driving a Subaru STI or something cartoonish from the Fast & Furious franchise.
3. Turbo spooling: I’m a mech/aero engineer, and believe that the air pushed back into the intake does put pressurized air back into the intake which would otherwise be lost. 100% could be wrong and/or OCD in thinking it through, but I do believe it could create a bit of lag or extremely miniscule moments of richness.

That said, for those who enjoy—cheapo and easy mod. I now have a fancy billet paperweight, lol.

 

[isis]

You’re correct about the lag but not about richness.

 

[KAH 24]

You’re correct about the lag but not about richness.

Yes sir, good point and my mistake. I imagine the ECM reacts in milliseconds—which would correct/adjust ratio.

Less lag is an engineering goal.

 

[isis]

It’s not MAF based. It fuels based on manifold pressure and RPM. Nothing to adjust.

 

[KAH 24]

It’s not MAF based. It fuels based on manifold pressure and RPM. Nothing to adjust.

Correct and my mistake. MAP based means increasing turbo lag to have a whooshing sound.

Tradeoff.

 

[isis]

Correct and my mistake. MAP based means increasing turbo lag to have a whooshing sound.

Tradeoff.

Pretty much. And you can hear the whoosh pretty well on a CAI which makes it a better choice for a noise maker.

 

[xrocket21]

Correct and my mistake. MAP based means increasing turbo lag to have a whooshing sound.

Tradeoff.

Uhh, thats not how it works. When the throttle plate closes on the high pressure side of the turbo, the pressure spikes becuse the turbo is still spinning. This prevents compressor stall, which is air travelling the wrong way across the compressor. Without a bov you risk damage to the turbo, as well as INCREASED lag, because you will slow down the wheel.

The only difference is piped back in or not. Piped back in is simply for noise suppression and emissions.

The intake side is essentially at atmospheric pressure (slight vacuum due to filter restriction), and pumping pressured air back into the intake open to atmosphere isn't going to do anything.

~buys twin turbo truck
~dislikes twin turbo noises
~profit?

 

[isis]

Uhh, thats not how it works. When the throttle plate closes on the high pressure side of the turbo, the pressure spikes becuse the turbo is still spinning. This prevents compressor stall, which is air travelling the wrong way across the compressor. Without a bov you risk damage to the turbo, as well as INCREASED lag, because you will slow down the wheel.

The only difference is piped back in or not. Piped back in is simply for noise suppression and emissions.

The intake side is essentially at atmospheric pressure (slight vacuum due to filter restriction), and pumping pressured air back into the intake open to atmosphere isn't going to do anything.

~buys twin turbo truck
~dislikes twin turbo noises
~profit?

Not quite. There’s no emissions impact either way. And piping it back into the intake keeps the turbos spinning so it’s ready to boost again. A recirculating system is faster to boost when you get back on it. It’s an increased charge that doesn’t go back out the intake if you’ve opened the throttle again already. It keeps the turbine momentum going.

Nobody here was suggesting no bov at all. He was saying a VTA one is simply for noise and has an actual drawback even if it’s minimal.

 

[xrocket21]

Not quite. There’s no emissions impact either way. And piping it back into the intake keeps the turbos spinning so it’s ready to boost again. A recirculating system is faster to boost when you get back on it.

Nobody here was suggesting no bov at all. He was saying a VTA one is simply for noise and has an actual drawback even if it’s minimal.

Piping pressurized air back into the unpressurized intake absolutely does NOT keep the turbos spinning lol, where do you even make this stuff up?

 

[isis]

Piping pressurized air back into the unpressurized intake absolutely does NOT keep the turbos spinning lol, where do you even make this stuff up?

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.