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Making my own Exhaust... Tips? 

 

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 Post subject: Re: Making my own Exhaust... Tips?
Posted: Mon Apr 04, 2011 6:35 pm 
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low_ryda wrote:
no definitely not saying don't have a go yourself !

i'm just saying, as a tradesman/sole trader that i like jobs to flow quickly and easily and doing an exhaust yourself doesn't go that way lol. i'm just having a whinge, i'm still impressed with the finished product. would be alot easier with some help to.

i can't justify the cost of using that much argon to purge an exhaust, like i said, i doubt you would notice the difference anyway. Purging should still produce a bead on the inside if your doing it properly. it just doesn't look like a hairy a55hole inside.

wouldn't bother with the effort for mild steel ? i can spend half a day just doing one weld on a big 4000kpa steam line in mild steel. It's only the under-educated that think steel is second best to stainless. Every material has it's use.

hot dogs are designed to filter out the high end noise. i don't understand what a harder noise is ?


If I'm going to put the effort into welding exhaust I'll put the extra money into argon if the job turns out better....it still costs less than paying someone to do it. My last system cost me about $350 including gas, 2 1/2" mandrel bends and straight 304 tube, and two walker Ultraflow mufflers.
Never said steel is 2nd best to stainless but steel is second best if a hole rusts through it on an exhaust you spent considerable time building. I managed to keep that same old exhaust off my old XE and now I'm going to cut it into pieces and weld it together for my BA...try that with some rusty old mild steel setup!
By Harder I mean a higher pitched less deadened sound.
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 Post subject: Re: Making my own Exhaust... Tips?
Posted: Mon Apr 04, 2011 6:44 pm 
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Really appreciate the feedback guys it's great.

From what i am reading i think i will go with a 2.5" Mild Steel from the cat back into 3" mufflers and some nice tips

Probably something like this on either side:

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I prefer the straight tips as apposed to the dump pipes personally, unless its an old rotary like an RX3 or something like that.

 

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 Post subject: Re: Making my own Exhaust... Tips?
Posted: Mon Apr 04, 2011 7:38 pm 
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i've put plenty of old mild steel pipes back together. they're either phuked or they're not.

the stainless exhausts i've thrown money at are 316, i wouldn't bother paying for a 304 system. of course purging is by far better, but it still creates a ridge for carbon to form. and lack of penetration would cause small gaps that would attract erosion. i'm talking from a process piping point of view, i'm not an exhaust person, i just have my own experience.

good posts by xafalcon. although i can't see how stainless is any harder to weld than mild steel technique wise, it just cost more sometimes. it welds exactly like mild steel, other than controlling distortion in weldments which isn't generally necessary in pipe construction. if anything it's more readily weldable due to lack of thick oxides.

 

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 Post subject: Re: Making my own Exhaust... Tips?
Posted: Tue Apr 05, 2011 12:13 am 
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Thats no good Ash!

If i run into any troubles with the bending etc, i will get a professional to do those. Had a look under the car today, and the only tricky looking part will be the bend on the rear left of the car where i will have to bend around the fuel tank etc..

 

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 Post subject: Re: Making my own Exhaust... Tips?
Posted: Wed Apr 06, 2011 5:00 pm 
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Fair call, I guess i would just like to save some money and at the end of the day, being able to say you made your own exhaust is pretty cool i think...

 

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 Post subject: Re: Making my own Exhaust... Tips?
Posted: Wed Apr 06, 2011 5:20 pm 
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Alan96EF wrote:
Fair call, I guess i would just like to save some money and at the end of the day, being able to say you made your own exhaust is pretty cool i think...


True this, but you need to know when to call it. I think it becomes less desirable when you have to spend 10-20+ hours tacking, bending, checking, breaking welds, re-tacking, holding, checking, marking, checking etc. Thats the point where i called it and just decided to buy one instead of making one. I reckon go for it if you feel confident about doing it. It will be a lot of fun in the end knowing that you made what everyone else can hear :twisted: :twisted: . Just remember about the technical side of the exhaust as well. Its not just for looks or sound so make sure you assess the bends and choose them so that they flow as much as possible. Are you thinking about using an X pipe as well?

 

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 Post subject: Re: Making my own Exhaust... Tips?
Posted: Wed Apr 06, 2011 5:25 pm 
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Good point, I'll give it a go though and see what happens... I'll start this weekend by measuring the existing RHS of the exhaust etc. I will also go into an exhaust specialist and ask a few questions... the X pipe being one of those questions, angle of bends they recommend etc etc,

I will start a thread once i have done a fair whack of the works too 8-)

 

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 Post subject: Re: Making my own Exhaust... Tips?
Posted: Wed Apr 06, 2011 5:31 pm 
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Might be a thought to jump into someone elses thread who have made an exhaust before for a v8 and check out what they have done. Might give you a bit of an idea on using X pipes, where to place mufflers, making new mounts on the passenger side etc.
You are going to love it when you're finished, knowing everyday you start it and hear the wonderful sound of a hand crafted exhaust. Best of all, YOU MADE IT!!

 

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 Post subject: Re: Making my own Exhaust... Tips?
Posted: Wed Apr 06, 2011 5:35 pm 
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I like the way you think mate, I'll have a look around. I look forward to taking my exhaust off this weekend to measure and starting it with no system apart from the cats on it :D :D

 

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 Post subject: Re: Making my own Exhaust... Tips?
Posted: Wed Apr 06, 2011 11:16 pm 
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yer thats the best part about making your own is you can guarantee no-one else's will sound the same. which is always worth alot of blood, sweat and beers lol

 

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 Post subject: Re: Making my own Exhaust... Tips?
Posted: Wed Apr 06, 2011 11:33 pm 
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Bring on them beer, actually bundy, i'll just have alot of bundy :)

 

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 Post subject: Re: Making my own Exhaust... Tips?
Posted: Wed Apr 06, 2011 11:37 pm 
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xafalcon wrote:
- Stainless steel tends to become brittle when welded and can crack with vibrations

That does depends on the grade of the stainless steel you use.

 

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 Post subject: Re: Making my own Exhaust... Tips?
Posted: Mon Apr 11, 2011 12:55 pm 
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I took the exhaust from the cat back off today to see what i was up against, and to be honest it looks fairly straight forward. The car has a fair bit of room underneath to move (When you remove the spare)

Image
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I will copy the existing alignment from the cats to the first muffler using 2.5" pipe, From there the RHS will go from the muffler into a hotdog at the rear then win tips, The LHS will need to be bent around then finished the same, Hotdog and twin tips.

I have also gotten access to a hoist which will make things heaps easier!

Thoughts?

Cheers

Alan

 

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 Post subject: Re: Making my own Exhaust... Tips?
Posted: Mon Apr 11, 2011 12:59 pm 
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Hoist = HALF YOUR JOB DONE!
I wish i had a hoist...

 

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 Post subject: Re: Making my own Exhaust... Tips?
Posted: Mon Apr 11, 2011 7:36 pm 
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I agree completely, a hoist takes out most the hard work.

Just had a quick skim back through, I don't think you've mentioned what you're welding it with :?:

 

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