Reduce the BOV (blow off valve) sound on aftermarket intakes?

[Doel]

I have a K&N ram air intake (they don't make a CAI for the Stinger) and it's loud. You don't hear it while cruising, but if you accelerate any more than grandma speed, you will hear a hiss but no BOV. You can NOT accelerate in sports mode without hearing the hiss. It takes a bit more acceleration to hear the BOV.

 

[Chucky]

Haha, good to know



Maybe downpipes, but I saw some testing, I think from Tonkabob, where the Cat delete's didn't make a difference. He did a few runs with the deletes on, then put the stock exhaust back on and got similar or better results on 1/4 mile times. Granted, many different factors could have affected the results. Same day and track, but different ambient temps, etc.

I think Terry@BMS also posted something about how the exhaust wasn't a very limiting factor, but the intakes and intercooler were big limiters. I'll have to take a look back through the forum to see if I can find those posts.

If I did go full exhaust, I'd be looking at a EVC exhaust so I could "turn down the volume" when I pulled into my neighborhood. However, I'm not a huge fan of the Jun BL EVC sound. Just a personal preference. Some of the audio clips I heard sound decent at idle and low RPM, but there's an awful rattle at high RPM in every video I've seen.

I suppose I could just go with these dump valves haha

There's significantly more evidence out there about higher flow exhausts (downpipe to muffler) that evacuate engine discharge more efficiently leading to performance gains. This is why sports cars, performance cars, and any kind of race car has freer flowing exhaust.

The Jun BL starts off loud and by opening the Electronic Control Valve a secondary exhaust valve it gets even louder; much louder because you are opening another large valve to allow exhaust to escape. From the videos I've seen this exhaust is loud to begin with and louder with valves open

 

[MrSmoofy]

Excellent video! This is exactly what I was looking to see/hear. It's good to see that, under normal acceleration you won't hear either the sucking or blow off. This seems way more "tolerable" for daily driving. And it makes a great sound when you want it to. Huge thanks for the video! I feel much better about picking up an intake now

Do you notice any difference in performance/throttle response? I'm wondering if the benefits will only be seen with a tune to go along with the intakes.

My butt dyno is apparently broken I didn't really feel much maybe some from a dead stop or very low speed, but I did go by my dealer so my sales guy could hear and see, took him on a ride he drives a 3.3TT Stinger as well but no upgrades yet. He basically said WOW what a huge difference and said he could definitely tell the difference compared to his. I'll be putting it on the Dyno again in about a week when my guy comes back from vacation.

The problem with any HP gains is you get use to them and want more

 

[bluegrass_gt2]

O.K. I may be mistaken, but the Air intake we used was the following.

2018 Kia Stinger 3.3L Air Intake

And that is not a CAI?

if i am calling it incorrectly please let me know.

Jeff

 

[bluegrass_gt2]

I stand corrected... The air intakes we have used are not technically CAI's.. So disregardful anything I posted with CAI and replace with Intakes.. Thank you K&N and other intake manufactures for incorrect labeling them.. But again my mistake..

 

[ecko04]

The blowoff sound from intakes may be over exaggerated. Yes, it’s noticeable over the factory intakes but it’s certainly not to the level of a different BOV. Also, when under heavy throttle you don’t notice the intake sound over say the engine revving.

 

[nhcowboy28]

The blowoff sound from intakes may be over exaggerated. Yes, it’s noticeable over the factory intakes but it’s certainly not to the level of a different BOV. Also, when under heavy throttle you don’t notice the intake sound over say the engine revving.

I think there is a difference between intakes then. The AP intakes (with the diverter recirculating into the intakes, not atmosphere) releases a tremendous sound upon letting up throttle after a strong pull. Much louder then the engine reving.

 

[ecko04]

I think there is a difference between intakes then. The AP intakes (with the diverter recirculating into the intakes, not atmosphere) releases a tremendous sound upon letting up throttle after a strong pull. Much louder then the engine reving.

My point remains the same, when comparing any intake to an aftermarket BOV it pales in comparison.

And the OP specifically mentioned reducing the BOV sound. There’s 1 surefire way to prevent intake sound...don’t change the intake.

 

[nhcowboy28]

My point remains the same, when comparing any intake to an aftermarket BOV it pales in comparison.

I would agree on that specific point.

 

[ecko04]

I would agree on that specific point.

And that was my point kind sir. If the OP want to reduce intake sound, don’t change the intake. Seems pretty straightforward. But I think most of us would differentiate intake from BOV.

 

[CoconutRob]

Haha, good to know



Maybe downpipes, but I saw some testing, I think from Tonkabob, where the Cat delete's didn't make a difference. He did a few runs with the deletes on, then put the stock exhaust back on and got similar or better results on 1/4 mile times. Granted, many different factors could have affected the results. Same day and track, but different ambient temps, etc.

I think Terry@BMS also posted something about how the exhaust wasn't a very limiting factor, but the intakes and intercooler were big limiters. I'll have to take a look back through the forum to see if I can find those posts.

If I did go full exhaust, I'd be looking at a EVC exhaust so I could "turn down the volume" when I pulled into my neighborhood. However, I'm not a huge fan of the Jun BL EVC sound. Just a personal preference. Some of the audio clips I heard sound decent at idle and low RPM, but there's an awful rattle at high RPM in every video I've seen.

I suppose I could just go with these dump valves haha

Check out Kunstwerk evc, you may like it. I do