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Old 10-30-2015, 03:44 AM   #1
tower_monkey
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Default what gauge for aluminium turbo exhaust?

looking to change over to alum down pipe.
currently aluminized steel with a short muffler out the front bumper.

did a search with no help soooo.....

what gauge alum are you guys using?

this is on a S480, so it will be 5"

thanks for any help
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Old 10-30-2015, 07:51 AM   #2
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Default Re: what gauge for aluminium turbo exhaust?

11gauge for the first two feet, 16 for the rest.
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Old 10-30-2015, 11:17 AM   #3
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Default Re: what gauge for aluminium turbo exhaust?

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Originally Posted by LS1NOVA View Post
11gauge for the first two feet, 16 for the rest.
You can do this, but the exhaust will not last as long. I would just use 11g for the entire length. I've been down this road a few times, and it's just easier to bight the bullet and due it right the first time. We have plenty in stock if we can help.

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Old 10-30-2015, 11:38 AM   #4
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Default Re: what gauge for aluminium turbo exhaust?

Why not run .035 or .049 stainless? Will be nearly as light and hold up much better IMO.


And Brian speaks the Truth! If you go Aluminum. Go 11 gauge the entire way.
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Old 10-30-2015, 12:10 PM   #5
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Default Re: what gauge for aluminium turbo exhaust?

i agree to run 11 gauge the entire way but i have plenty of both in stock if you need some help with some

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Old 10-30-2015, 12:17 PM   #6
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Default Re: what gauge for aluminium turbo exhaust?

I ran 11 the entire way. Havent ran it yet to see how it holds up though..
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Old 10-30-2015, 12:17 PM   #7
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Default Re: what gauge for aluminium turbo exhaust?

That thin wall large diameter tubing has to be pretty rare. SPD doesn't even stock thin wall straight 5 inch.

You can get 11 guage dirt cheap in 5 inch, and it cuts with a wood band saw without issues.
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Old 10-30-2015, 01:09 PM   #8
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Default Re: what gauge for aluminium turbo exhaust?

Missed the 5" part. Not sure I've ever seen .035" 5"
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Old 10-30-2015, 01:34 PM   #9
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Default Re: what gauge for aluminium turbo exhaust?

I have built street stuff with 11 guage, holds up great.
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Old 10-30-2015, 02:40 PM   #10
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Default Re: what gauge for aluminium turbo exhaust?

Mine is 5" 16 gauge right off the turbo with an immediate 90. Been on there 2 years now with probably 500 miles a year on the street and 30-40 passes with no issues. It is ceramic coated I don't know if that helps but that's my personal experience.
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Old 10-30-2015, 05:11 PM   #11
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Default Re: what gauge for aluminium turbo exhaust?

thanks for the help guys. will most likley do the 11 gauge alum. the entire exhaust is only 2 feet long.
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Old 10-30-2015, 05:16 PM   #12
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Default Re: what gauge for aluminium turbo exhaust?

I forgot to add that if anyone does do 16 gauge aluminum don't try it with any bends. The tubing is too thin on the bends and will give out. I've got stainless until the trans area and then 16 gauge aluminum to the axle with Vibrant aluminum mufflers. Couple thousand street miles and 100 1/4 mile passes. Whole thing only weighs 14 lbs.
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Old 10-30-2015, 05:31 PM   #13
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Default Re: what gauge for aluminium turbo exhaust?

Quote:
Originally Posted by Shearer View Post
Missed the 5" part. Not sure I've ever seen .035" 5"

did a search, didnt find any place with 5" .035 wall stainless. any idea where to look? or if its made?
thanks shearer
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Old 10-30-2015, 05:39 PM   #14
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Default Re: what gauge for aluminium turbo exhaust?

Quote:
Originally Posted by LS1NOVA View Post
I forgot to add that if anyone does do 16 gauge aluminum don't try it with any bends. The tubing is too thin on the bends and will give out. I've got stainless until the trans area and then 16 gauge aluminum to the axle with Vibrant aluminum mufflers. Couple thousand street miles and 100 1/4 mile passes. Whole thing only weighs 14 lbs.

what about mandrel bends with the 16 gauge?

my current setup comes off the turbo about 6 inches, then 45* and then out the bumper. if a guy used a mandrel bent 45 would it be ok?
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Old 10-30-2015, 06:08 PM   #15
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Default Re: what gauge for aluminium turbo exhaust?

Quote:
Originally Posted by tower_monkey View Post
what about mandrel bends with the 16 gauge?

my current setup comes off the turbo about 6 inches, then 45* and then out the bumper. if a guy used a mandrel bent 45 would it be ok?
You definitely want to use 11ga bends. Even mandrel bends formed with plenty of lube stretch the outside radius just as much as it bends them. I have seen almost every 90* elbow I have cut to be more like 16ga on the outer side. This is why the other guy cautioned you about the 16ga bends. They don't stretch as much since they are easier to bend but they are still too thin to use anywhere near the turbo end of the system. For the OP's application there is almost no weight difference so the 11ga is the logical choice.
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