• Welcome to SAU Community

    Welcome to SAU Community, like most online communities you must register to view or post in our community, but don't worry this is a simple free process that requires minimal information for you to signup. Be apart of SAU Community by signing in or creating an account.

    • Start new topics and reply to others
    • Subscribe to topics and forums to get email updates
    • Get your own profile page, build reputation and make new friends
    • Send personal messages to other members.
    • See fewer ads!

    Consider joining our newsletter for the latest content updates

    Click here to register


Sign in to follow this  
nik.

Custom exhausts / oval exhausts

Recommended Posts

Not sure if this belongs here or in fabrication but I'm more concerned about the technical side of this , so here we go

 

I run a 1j 180sx drift car with a borgwarner s360 with plenty of custom shit 

I'm trying to make a 4" dump that merges to a 6"x2.5" oval section just under the front of the car and when it crosses under the tunnel (as a jz exhaust crosses under the car on any nissan) at the rear of the gbox it merges to 3.5" tube and points straight to the rear of the car 

 

I'm just wondering if anyone has any feedback in terms of performance or flow or any characteristics worth noting/ any discussion by making an exhaust like this 

20190109_181938.thumb.jpg.f452d241a5dda927c62b022e65542e93.jpg20190109_203239.thumb.jpg.ad05828bc611e87c4387e1f18467f997.jpg

I'm struggling to beat the metal to make it perfectly smooth. There is clearly some edges around the added in piece to make them merge but again, I dont think I'll encounter any issues, I'm just looking for any feedback/ discussion/ personal experience with changing exhaust dimensions/ shapes

 

 

 

 

And 1 bay pic because nothing is anything without pics 😊

20190106_192549.thumb.jpg.6295f7bbc4da5db3445356017eee0a21.jpg

 

 

Cheers!

Share this post


Link to post
Share on other sites

It won't be an issue. Also poewredbymax sell oval exhaust off the shelf i believe, but it looks like you have most of it done already.

Share this post


Link to post
Share on other sites

I actually wrapped it up today 

20190112_170536.thumb.jpg.c638afb71d75a41c795b0371a82dc7c0.jpg20190112_172644.thumb.jpg.a613bba5367c8de8365d8e3af4a27880.jpg20190112_172629.thumb.jpg.e7fc9abe4f4387796ffb2d1e7d29da54.jpg

Was more interested in if it would disturb exhaust flow going flat or lose velocity, or if running a twin 2.5" would be beneficial because round etc

I always read about "properly designed exhausts" but my take on a turbo car was just let it flow as much as it can 

 

Anyway, I guess there is nothing to gain. I've made it now lol

 

  • Like 1

Share this post


Link to post
Share on other sites

The very best shape is round, because this has the highest ratio of cross sectional area to wall area.  If you make it oval shaped, you get more wall for the same number of square units of flow area, so get more friction.  But provided you don't go too extreme (ie, keep the L/D ratio to about 2 or less, it shouldn't make a difference that anyone would notice.

  • Like 1

Share this post


Link to post
Share on other sites

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now
Sign in to follow this