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2021 ST BOV
- Thread starter Selldawg22
- Start date
So my OEM BOV must have been defective or something, because I see a pretty surprising improvement after putting in the TS VR13. There is less 'lag' when accelerating, decelerating. I used to have intermittent brief hesitation when accelerating normally or quickly, and when I let off there used to be an uneven deceleration; all these seems to be gone! Very pleased and had no idea of the benefit of this small modification or I would have done this a long time ago 
Whipple mega cooler is supposed to be delivered today (ordered 10/15), excited to get that installed!
Whipple mega cooler is supposed to be delivered today (ordered 10/15), excited to get that installed!
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Brett at Fenfab can make a kit for you with also having the BOV of your choice at this link - https://fenfabrication.com/parts/fe...T79nMKFijwipvoboBD-jB1r_F-ruLwplK5MtdRkNWY6ww
Since you have the TS BOV then you can go to this link and choose it which is a little cheaper and he builds the pipe for people like you and me without a BOV - https://fenfabrication.com/parts/fenfabrication-2020-ford-explorer-st-charge-pipe
I too can hear mine but its so subtle . When comparing the calibrations of 20 and mid/later 21 the BOV portion is off in the OEM tune on mine if im not mistaken. In fact there is a lot of codes shut off compared to 20 vs mid 21
Here is a video -
and here is the install someone posted - https://www.explorerst.org/threads/fenfab-intake-install-instructions.2774/#post-37919
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First, before anyone gets their panties in a bunch, if you want a blow-off valve because you like the sound, go for it. But if you look at my posts, it has gnawed at me that people are not only adding BOVs, but also talking about "less lag in operation" and "better driveability". Now let's face it, there's always a placebo effect when someone spends money on their car and the butt dyno is highly suspect. So, I did some checking into mfgs anti-lag systems and BOVs and found the following Ford patent: https://patents.justia.com/patent/9714620
It's very, very slick.
I also found another patent from Porsche which I won't detail here dealing with their "Dynamic Boost" system, which shares some of the same basic operations. So, let me distill it down for you. It operates basically the same way as I detailed in post #51 in this thread, including the EGR operation (valve timing) but also includes operation of the lockup converter which I hadn't considered. What this means is that the BOV is basically useless (other than for some sound). Not only that, but by using a BOV you're actually stealing a bit of turbine speed during full throttle shifts by adding one, thus defeating the purpose of the anti-lag programming. Now honestly, this probably doesn't even equate to a 1/10 in the quarter (for those interested in such things), but it should illustrate that adding a BOV to make your car faster- well it's a pointless expense. Unless of course your need for a bit of "whoosh" outweighs your efforts to put down the best times.
It's very, very slick.
I also found another patent from Porsche which I won't detail here dealing with their "Dynamic Boost" system, which shares some of the same basic operations. So, let me distill it down for you. It operates basically the same way as I detailed in post #51 in this thread, including the EGR operation (valve timing) but also includes operation of the lockup converter which I hadn't considered. What this means is that the BOV is basically useless (other than for some sound). Not only that, but by using a BOV you're actually stealing a bit of turbine speed during full throttle shifts by adding one, thus defeating the purpose of the anti-lag programming. Now honestly, this probably doesn't even equate to a 1/10 in the quarter (for those interested in such things), but it should illustrate that adding a BOV to make your car faster- well it's a pointless expense. Unless of course your need for a bit of "whoosh" outweighs your efforts to put down the best times.
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Am I still in the ST forum ??? I think if anyone bought this vehicle with the intension of being the quickest on the street or track , a little "whoosh sound" is the least of the problems IMHO . If someone wants to add a BOV for a little sound effect and then throw some " My Little Pony " stickers on the side of their vehicle , I don't think it's anyone's business because it's not their vehicle . I know all the stuff I have done to my vehicle is not to everyone's liking but it's mine and I love it.....of course I have a '20 with a factory BOV so it made my life easier when I wanted to switch it out .
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