5" dump pipe into 2x3" pipes question.
#880597
12/15/10 07:33 AM
12/15/10 07:33 AM
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Joined: Dec 2005
Posts: 96 Australia
gg408
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Australia
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Due to lack of room in my 67 Valiant I was wondering if going from 5" dump pipe to twin 3" pipes will cause a lot of back preasure/restriction. S480 BW on 410ci W2 headed SB Mopar. Cheers gg408
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Re: 5" dump pipe into 2x3" pipes question.
[Re: gg408]
#880598
12/15/10 01:47 PM
12/15/10 01:47 PM
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Joined: Jan 2003
Posts: 28,071 Irving, TX
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Senior Management
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Irving, TX
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A three inch pipe has an area of 28 square inches. Two of them have 56 square inches. A five inch pipe has an area of 78 inches. Maybe you could use three 3" pipes?
We are brothers and sisters doing time on the planet for better or worse. I'll take the better, if you don't mind. - Stu Harmon
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Re: 5" dump pipe into 2x3" pipes question.
[Re: dizuster]
#880601
12/15/10 02:25 PM
12/15/10 02:25 PM
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Joined: Dec 2005
Posts: 121 mid-mich
turboplymouth
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mid-mich
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Seems I remember seeing some tests showing that those turbos reduced down to 4" did'nt hurt power. I know there are guys making big power that way.
'72 Scamp, 3500#, 440, S400, blowthrough, meth. inj.
9.78 @ 139 so far at 12 psi, 11.00 @ 131 on real street tires.
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Re: 5" dump pipe into 2x3" pipes question.
[Re: TheOtherDodge]
#880603
12/15/10 03:10 PM
12/15/10 03:10 PM
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Joined: May 2008
Posts: 1,238 North Cackilacky
sdaurity
pro stock
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pro stock
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North Cackilacky
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I saw no gain going from 4" to 5" on my large frame 101. I put the 4" back on because it fit so much better. but I'm not pushing it to the absolute limits. No need for 5" on an s480 anyways.
One day I will have something cool here.
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Re: 5" dump pipe into 2x3" pipes question.
[Re: turboplymouth]
#880606
12/16/10 06:58 AM
12/16/10 06:58 AM
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Joined: Dec 2005
Posts: 96 Australia
gg408
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Ok so if I go for a 4 " pipe how close to the turbo outlet should the reducer be and do I need to have a long reducing cone and if so what would the min length be? This is what I have now and am trying to get the 3" pipes to run up next to the eng so they dont hang to low under the k-member. Thanks Cheers gg408
Last edited by gg408; 12/16/10 07:12 AM.
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Re: 5" dump pipe into 2x3" pipes question.
[Re: gg408]
#880607
12/16/10 07:36 AM
12/16/10 07:36 AM
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Joined: Dec 2005
Posts: 96 Australia
gg408
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Australia
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Re: 5" dump pipe into 2x3" pipes question.
[Re: gg408]
#880608
12/16/10 07:38 AM
12/16/10 07:38 AM
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Joined: Dec 2005
Posts: 96 Australia
gg408
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Posts: 96
Australia
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Re: 5" dump pipe into 2x3" pipes question.
[Re: gg408]
#880609
12/16/10 05:09 PM
12/16/10 05:09 PM
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Joined: Jan 2003
Posts: 28,071 Irving, TX
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It would be best to have the reduction after the initial turn. The air will begin losing rotation as soon as it leaves the turbine but that first turn is still very turbulent.
We are brothers and sisters doing time on the planet for better or worse. I'll take the better, if you don't mind. - Stu Harmon
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