[Gnade]

Bov: Tial Q
Vacuum reading via Turbosmart adapter from PCV connection
Bov location: Hot side

What spring?
Tial Q spring size chart says that you choose spring based on idle vacuum. Ecoboost produces ~500mmHg vacuum at idle. If my conversion is correct, that is ~19-20inHg. Looking at Tial spring charts, Yellow or Plain should work. If you go through this FUll Race FMIC TiAL BOV installed I read out that 7 psi spring (Black) is correct. On americanmuscle.com they used to sell Tial bov with 8 psi spring (White).

Should Bov be closed or open?
One forums states one thing other states another thing. Fact should be that vacuum pulls bov open. By that logic If engine produces ~19-20inHg in idle and you have a Black spring what is rated ~8-13 inHg. Vacuum in idle should be enough to pull Bov fully open. If Black spring is correct, then by that logic bov should be open at idle. if now other "expert" states that bov should befully closed at idle means that Black spring is too weak and should be replaced with Yellow or Brown. Either way, the moment you press gas pedal vacuum decreases. Means the spring pushes bov closed.

If you use weaker spring than intended...
By logic weaker spring opens bov sooner, because it requires less vacuum to open.

If you use stronger spring that intended...
Then by logic with stronger spring the bov stays closed longer. Because while 10inHg black already open, the yellow stays closed until vacuum drops to 20inHg.

On paper...
You'd want bov to be closed as soon as you hit the gas. If you have a stronger spring, your valve will already closed before you hit gas. But you also want it to open as soon as you let go gas. Means the weaker (Black) would open sooner.

So how do you know what spring to choose?

 

[77Highboy]

One of the reasons I went with an HKS BOV was because of all of the information out there saying Tial BOVs should be open at idle. If the BOV is open at idle, the engine is pulling in unfiltered air. This isn't so much an issue for a race car, but for a DD, I don't want to be pulling in air that's potentially filled with dust and other abrasives. If I did have one, I would go with the weakest spring that still keeps it closed at idle.

 

[Buldawg76]

I would rather let the PCM control the BOV electrically since it will respond quicker to electrical signals than a vacuum operated BOV will and there is no having to figure out which spring you must use. If you add the GFB DV+ kit to a stock 2015 - 17 BOV you get the best of both worlds.

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BD

 

[zhent]

I would rather let the PCM control the BOV electrically since it will respond quicker to electrical signals than a vacuum operated BOV will and there is no having to figure out which spring you must use. If you add the GFB DV+ kit to a stock 2015 - 17 BOV you get the best of both worlds.

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BD

Yep, totally this.

 

[Gnade]

With that logic one could say "I would rather have na V8" and provide nothing to topic.

 

[KewlWinter]

I would rather let the PCM control the BOV electrically since it will respond quicker to electrical signals than a vacuum operated BOV will and there is no having to figure out which spring you must use. If you add the GFB DV+ kit to a stock 2015 - 17 BOV you get the best of both worlds.

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BD

This has been been advice also after having run TiAL, HKS, GFB DV+ (bypass and VTA), Turbosmart, and Boomba Racing on 2015, 2018, and 2022 EBs. The worst performer was the TiAL on a CP-e Exhale cold side pipe. It boost leaked and the response wasn't that crisp. The HKS and Turbosmart BOVs were ok, but again, the response wasn't quite what I was looking for. The best performers for me were the GFB (both versions) and Boomba Racing, which are controlled by the PCM and are very responsive. I am using the Boomba Racing BOV on my 2022 and it works exactly as I expect. As did the GFV DV+ VTA I was running on my 2018 before I traded it in.