Which air intake system to go with?

25598 Views 44 Replies 15 Participants Last post by tevbax, Jul 19, 2018

Bloodtrain

Discussion Starter · Aug 3, 2017

Hi guys,

I've seen a few options for air intake systems such as Tork's Big Gulp and the one from SXTH. Are they similar? Which one is better and are there others?

For now, I've unplugged the BOV hose to see if mileage is (positively) impacted and if I like the pshhh sound. The pshhh sound does get a little annoying so is there a way to soften it?

Thanks!

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R1600Turbo

· #2 · Aug 3, 2017

A few things:

1) As far as the intake, they both pretty much do the same thing. It all comes down to which one you think you want. I went with SXTH because of the seamless pipe with no welds and because Mark at SXTH had no issues adding a port for the factory BPV (bypass valve aka blow off valve) because I hated the way it sounded disconnected.

2) Mileage will not be effected disconnecting the stock BPV hose.

3) If you plan on leaving the BPV off like that, you'll need more than electrical tape to seal that off properly. Most people use 7/8" or 1" rubber chair feet that you can get at most hardware stores.

Now back to the stock BPV, if you don't like it simply disconnected (I didn't) then you can have Mark add one for you. There is a small fee, but it's worth it. Here's a small video I made of what it sounds like. Has more of a blow off sound rather than a generic rush of air.

And a photo:

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Reactions: 3

Mohkx

· #3 · Aug 3, 2017

I was wondering about this too. Id seen a video of someone installing a Tork intake but just left the hose there hanging freely. Didn't know if it made a difference or not but I still didn't know if it was bad to just not have a port for it. Or even if having that whole BPV hose gone does much good or bad for the car and how it breathes.

Bloodtrain

Discussion Starter · #4 · Aug 3, 2017

R1600Turbo said:
A few things:

1) As far as the intake, they both pretty much do the same thing. It all comes down to which one you think you want. I went with SXTH because of the seamless pipe with no welds and because Mark at SXTH had no issues adding a port for the factory BPV (bypass valve aka blow off valve) because I hated the way it sounded disconnected.

2) Mileage will not be effected disconnecting the stock BPV hose.

3) If you plan on leaving the BPV off like that, you'll need more than electrical tape to seal that off properly. Most people use 7/8" or 1" rubber chair feet that you can get at most hardware stores.

Now back to the stock BPV, if you don't like it simply disconnected (I didn't) then you can have Mark add one for you. There is a small fee, but it's worth it. Here's a small video I made of what it sounds like. Has more of a blow off sound rather than a generic rush of air.

And a photo:

I'm a little confused now. I thought that diverting hot air back into the intake contributes to reducing horsepower.

I haven't seen an installation video for SXTH's intake. Is there also a catch can? How does that work?

Thanks for the info!

Reactions: 1

dmushet1

· #5 · Aug 3, 2017

Bloodtrain said:
I'm a little confused now. I thought that diverting hot air back into the intake contributes to reducing horsepower.

I haven't seen an installation video for SXTH's intake. Is there also a catch can? How does that work?

Thanks for the info!

I have the Sxth intake - I went with theirs because I wanted to maintain the status quo have having the BPV vent back into the intake and I wanted to the breather line as well so the vapors could be burned off as opposed to just venting into the engine by or catch can.

Could venting hot air back into the intake reduce horsepower, possible. Would it be noticeable, probably not. There is not an installation video for Sxth yet, but they have instructions on their website under the support tab with pictures and all.

SXTH-Element

· #6 · Aug 3, 2017

Bloodtrain said:
I'm a little confused now. I thought that diverting hot air back into the intake contributes to reducing horsepower.

I haven't seen an installation video for SXTH's intake. Is there also a catch can? How does that work?

Thanks for the info!

The air expelled by the BOV is a little warm. I wouldn't call it hot. It's been cooled by the intercooler so it's not too much hotter than the ambient air.

It's also expelled for a fraction of a second. The amount of air released into the intake system has a negligible effect on the overall temp of the incoming air in the pipe.
That's only if you choose to recirculate the air. Our standard kit deletes this connection since it's unnecessary for normal function.

We have not finished our catch can kits yet. End of the month hopefully!

lkaufmann19

· #7 · Aug 3, 2017

I disconnected my BPV hose for a quick drive with the stock intake and was surprisingly less annoying than everyone makes it seem. I could barely hear it with the windows up and radio down. Only time I hear it was with all the windows down and even then I think it sounds great.

R1600Turbo

· #8 · Aug 3, 2017

lkaufmann19 said:
I disconnected my BPV hose for a quick drive with the stock intake and was surprisingly less annoying than everyone makes it seem. I could barely hear it with the windows up and radio down. Only time I hear it was with all the windows down and even then I think it sounds great.

I just didn't like the tone. It doesn't sound like a true BOV to me, just a huge rush of air. With it connected, you get a more normal "pshhhh" like a BOV. To each their own though.

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doppler.effect

· #9 · Aug 3, 2017

The only difference is no-weld versus weld in the pipe construction. Both intakes are the same diameter so you will get the same airflow from either of them. There will be zero horsepower difference between the intakes, and any difference is within margin of error to be thrown right out.

I just removed the BPV hose entirely when swapping out the intake. Because we have a MAP sensor setup, recirculating is not needed whatsoever, and removing the hose instead of it flopping around saves about half of a pound. So why not? Every little bit counts.

i went with Tork, but it's really up to you. Their candy red looks fantastic.

lkaufmann19

· #10 · Aug 3, 2017

R1600Turbo said:
I just didn't like the tone. It doesn't sound like a true BOV to me, just a huge rush of air. With it connected, you get a more normal "pshhhh" like a BOV. To each their own though.

Gotcha, I can understand that. I won't know what it'll sound like connected since my intake that's coming in doesn't have it but the sound isn't too bad for me at least. I figured I would disconnect it with the stock intake before I install the new one just in case it was too loud. Luckily it is pretty mild and I can live with it every day.

R1600Turbo

· #11 · Aug 3, 2017

lkaufmann19 said:
Gotcha, I can understand that. I won't know what it'll sound like connected since my intake that's coming in doesn't have it but the sound isn't too bad for me at least. I figured I would disconnect it with the stock intake before I install the new one just in case it was too loud. Luckily it is pretty mild and I can live with it every day.

My video above shows what it sounds like connected.

Reactions: 1

Mohkx

· #12 · Aug 3, 2017

So what is the downside of taking off the BPV hose completely? Say I have the stock intake or a short ram?

Reactions: 1

R1600Turbo

· #13 · Aug 3, 2017

Mohkx said:
So what is the downside of taking off the BPV hose completely? Say I have the stock intake or a short ram?

Nothing. Just make sure you cap the port on the intake tube.

Reactions: 3

Mohkx

· #14 · Aug 4, 2017

R1600Turbo said:
Nothing. Just make sure you cap the port on the intake tube.

Any ideas on how to cap it? Other than the rubber chair feet I see you've mentioned earlier.

R1600Turbo

· #15 · Aug 4, 2017

Mohkx said:
Any ideas on how to cap it? Other than the rubber chair feet I see you've mentioned earlier.

Rubber chair feet.

Mohkx

· #16 · Aug 4, 2017

R1600Turbo said:
Rubber chair feet.

The amount of options are insane!! So pretty much its fine to take out that whole BPV hose (given I cap it off). What does the bottom of the hose do? Go to? Or is that just where the air goes when we let off throttle?

R1600Turbo

· #17 · Aug 4, 2017

Mohkx said:
The amount of options are insane!! So pretty much its fine to take out that whole BPV hose (given I cap it off). What does the bottom of the hose do? Go to? Or is that just where the air goes when we let off throttle?

Bottom of it is attached to the BPV. You can just leave it open.

Mohkx

· #18 · Aug 4, 2017

R1600Turbo said:
Bottom of it is attached to the BPV. You can just leave it open.

Gotcha. Is there a link somewhere that tells me more about this? I know Im asking a lot of questions, I just don't know much turbos and how the systems work (even though my dream car is the 94 twin turbo supra

)

R1600Turbo

· #19 · Aug 4, 2017

Mohkx said:
Gotcha. Is there a link somewhere that tells me more about this? I know Im asking a lot of questions, I just don't know much turbos and how the systems work (even though my dream car is the 94 twin turbo supra)

Not really, it's pretty easy though. Just take the whole rubber tube out and cap the intake side. All done.

Mohkx

· #20 · Aug 4, 2017

R1600Turbo said:
Not really, it's pretty easy though. Just take the whole rubber tube out and cap the intake side. All done.

No no no. I mean how the whole system works. Like exposing why the BPV hose exists, it's purpose, what happens to the system when it is gone? Things like that.

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