S54 Header Design talk

[3staxontheradio]

Talking about port shape and not primaries but literally exactly what I was drawing out for non circular cross sections in bends and opening up the inner radius CSA to manage air speed:

https://youtu.be/C2n3ywS8ce8?si=Uj6QzzZf9t1Allms

[Abrajam]

Super curious how these will sound once the final product is made. Brysons mullet tune is legit so I imagine once the headers are made, they’ll be just as spectacular. Convinced 3 of my friends to get his tune and they absolutely love it. Would love to try the headers on my dinan s3-r. If a test dummy is needed, I volunteer as tribute 😂

[Casa de Mesa]

Brysons mullet tune is legit so I imagine once the headers are made, they’ll be just as spectacular.

+1! Really enjoying his dichotomy tune!

[freebird]

Question, do stepped headers help mainly by improving scavanging, or from reducing reversion?

[BTB]

I haven't seen a lot of talk about AHR headers/section 1. Any thoughts on this? I too am interested primarily in getting that smoothed out, screaming exhaust note. Currently have SGT headers/section 1, Rogue section 2 with dump valve and stock muffler. Wondering if I can maintain stock muffler and still improve sound whether dump valve is open or full closed

https://americanracingheaders.com/collections/bmw/products/bmw-e46-m3-long-system?variant=41948375428

[freebird]

I'd be skeptical. The ARH's aren't equal length primaries, and a 6-1 merge seems like that would complicate the fact they're not equal length?

[0-60motorsports]

So cool:

https://www.instagram.com/reel/DYVyd_wJpao/?igsh=MWp6ZjB1YmZjN2VrYw==

[freebird]

Yes!

[George Hill]

I haven't seen a lot of talk about AHR headers/section 1. Any thoughts on this?

6-1 headers/exhaust are pretty much known for making a great sound at the expense of torque and generally not much (if at all) hp increase.

[freebird]

6-1 headers/exhaust are pretty much known for making a great sound at the expense of torque and generally not much (if at all) hp increase.

Make sense from what I've read, and the little bit of exhaust modeling and tuning I've been doing for my S54. The location of the secondary (2-1) merge has a big impact on the torque curve.

[clayton8or]

Pretty sure this exhaust research is not quite applicable here due to the extreme pipe length, but its certainly an interesting concept demonstrating fundamental principles that could be advantageous, in the pursuit of sound, the power arrived. Something no S54 header can currently combine... Even with the "best" SSV1 people are seeing weakness with here.

https://www.youtube.com/watch?v=sTvaE0YiQ4U

[digger]

if you goto post 1 it is written in plain sight from pipemax and not new information or error in theories

--- Primary Tube Harmonics --- ( One-End-Closed Tube = Odd Numbered Harmonics )
1st Harmonic = 1825.687 to 1916.439 mm long ... typically never used ( too long to fit any Vehicle )

[Vanar]

Depending on the timeline of this, It would be interesting to apply this design in AngeTheGreat’s Engine simulator if it comes out in time: https://youtu.be/sUdnJTC2w9I?is=Ofrs-sjjh3ErzBGx

[9kracing]

Do we have thoughts on 5150's Race Header?









https://5150autosport.com/products/p54-racing-header

[Cronenberged]

Like similar to the Motorsport headers