Hey everyone...

So im an engineering student and we recently learned to use drawing software. So i had the idea of designing my own custom exhaust and to test for flow properties and heat dissipation.

Im completely open on the look/shape of the exhaust (the more ideas the better) and different ideas as to how to make this system the "best"

My main idea is to make a full catback system in three pieces. The main pipe, a resonator pipe (i want to be able to remove the resonator when im at the track) and the axleback.
Im probably going to go with a 2.5" inner diameter

So please post ideas and i will gladly test them

 

 

I think it should use one main muffler, as in the ireland engineering pipe. and two big freakin tips! 2.5 should be a good size, 3 in seems to be too big for these little guys, they need back pressure. any chance you'd be able to make me one, if it works out?

 

mgrant, as you come from the same place than me, I would warn you about making a custom exhaust in our province. You should know in our area there are alot econobox (civic, cobalt, etc) with fart cannon and SAAQ modified the laws in consequence: free flow exhausts are prohibited if your car doesn't come stock with it. The exhaust noise is the hint that the police officer uses to pull over a car and check up the exhaust (ticket if he judges it illegal + a note in the CRPQ for illegal exhaust).

So, if you want to make a custom exhaust, make it close to the JCW or the DINAN spec (sound) and avoid tips bigger than JCW. If it's louder, your chances to get caught by the police will be highier.

 

Thats crazy! i think this marks the first time ive heard of a law that exists in canada, but not the us. I know a lot of people around here roll around with fart cans, and i've never heard of any law pertaining to that... though its a different story about CATs, if you don't run one, and the cops check under your car, you can get (i think i read this somewhere) a 200 dollar ticket

 

For sure once all exhaust are designed you will b able to go a get it fabricated


HeavyMetal
For sure it will not sound like a honda fart canon. I will be saving a place on the main exhaust tube to try multiple resonators as to avoid the fart canon sound

 

luseboy, this law exists in Québec because many of those econobox with fart canon raced in residential neighboorhood and killed innoncent people. (in a case in Vaudreuil-Dorion, 2young drivers raced with their lightly modified econoboxes and one of those lost the control of his car, passed throught a private backyard and killed a 4years old little girl and injured many other kids). So, the gouvernment put enforcement laws against those drivers and everyone pays for that. They raised tickets agaisnt high speed, race and exhaust noise. Doing high speed is now criminal. There is a good side of that, those young drivers who love to copycat Fast and Furious will be out money and they will be not able to drive a car for long.


mgrant, I didn't get caught yet but it was close: I was on St-Denis street in Montréal between Ontario and Maisonneuve and a MINI owner came beside me and told me : "C'est quoi ton exhaust, le son est vraiment écoeurant." I replied to him: "C'est un exhaust custom, c'est pour ça qu'il a ce son-là." Behind us, there was a police car and thought the other MINI was running with no cat, I don't know... but he pulled up the other MINI. I passed him and he was like "WTF, why me" at me. I never saw this guys after. I guess I got some luck.

 

Just finished reproducing the car's bottom. Now comes time to actually design an exhaust !

 

does anyone know the thickness of the exhaust pipes ????

 

16 or 18 gauge

 

whoa that really not thick

thx for the info

 

project got a bit delayed but is now back on track

I should have the first design done sometime next week

 

It was very informative article really help to me....
Thanks for your sharing...
Thank u so much...!

Custom Exhausts

 

Check out my exhaust thread.
https://www.northamericanmotoring.co...d-part-ii.html
word to the wise, you can design it with cad all you want, but getting the bends right is still a pita, you will need at minimum (or i did) a shop-grade bandsaw, compound miter with a metal blade, pipe-cutter, shear (i used a 58" one) and welding equipment. I am also an engineering student (b-mol chemical @ clemson university) and used my campus's agricultural mechanization fabrication lab.

the exhaust pictured was a rough play around, i currently have the funds in the works for getting my final version done
here is a rough paint sketch of what it will be (these are all straight through mufflers/ resonators, and why so many? because its quieter than a JCW but flows a lot more!)

in my current setup i have the muffler (different one, same series) post cutout and the 2 vibrant resonator loop before. This new setup should be quieter with the cutout closed (parallel and not series through these resonators works better) Also the muffler and one resonator still had some of the typical 4-banger non-sense to it, so with the cutout open it sounds good, but could have a little less of that 4-banger sound, the 2 resonators last should fix that. ( i had it with all 3 in series before, and it wasn't too-loud but was SOOOO smooth of a note)
the sectoin in the drawing where one pipe kind of disappears is where the two pipes should be right on top of each other, and the square ends near the end were lazy-ness, and they are actual tubing.

ohh! almost forgot, to do the custom splits a plasma-cutter is almost required.

 

I have been looking at doing a custom exhaust myself. I am looking to use the mufflers off an AP2 Honda S2000 and run them out by both tires instead of in the middle. Basically run a "Y" split off the downpipe around the battery on both sides into the SP2 mufflers. Similar to this:

http://www.flickr.com/photos/3675211...in/photostream