help with exhaust
Posting Guru
Joined: Dec 2008
Posts: 1,007
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From: Sterling, Va
Since when are glasspacks deep and loud?
They are loud but in a raspy/crackling/popping kinda way.
I had true dual glasspacks on my 86 for a while before redoing the exhaust.
YouTube - 86 F150 302 exhaust
Magnaflows are my favorite fosho.
They are loud but in a raspy/crackling/popping kinda way.
I had true dual glasspacks on my 86 for a while before redoing the exhaust.
YouTube - 86 F150 302 exhaust
Magnaflows are my favorite fosho.
Kyle
Elder User
Joined: Feb 2009
Posts: 786
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From: Up Up Upstate, NY
Ya I got the longest ones they had, sounds like a muscle car and dosent pop or crackle in any kind of way.
Posting Guru
Joined: Oct 2009
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From: Ohio
Back pressure is what you don't want , thats why when you open up your exhaust it makes more low end TQ and all around better power . But header tube size & exhaust size will make a difference , 1 1/2 primary long tubes work good , when the exhaust comes out of the motor its hot & the exhaust flows faster thru the smaller pipe because it stays hotter ,causing a scavenging efect , sucks the exhaust out of the motor faster , to reduce back pressure after the headers use like 2 1/2 on duels or 3in on single , the exhaust stacks up at the muffler so you can step up to a bigger size muffler & tail pipe to elimenate back pressure at the muffler......Lew
Postmaster
Joined: Jan 2009
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Yep exhaust pipe size makes a difference , depending on what you want from the motor , say you have a motor that is a high rever & you dont need the low end , bigger tube headers & exhaust will help , for more low end smaller tube headers & smaller exhaust . So it takes some research to find what you want , and what you want out of the truck ....Lew
Postmaster
Joined: Mar 2008
Posts: 2,703
Likes: 7
From: Des Moines, Iowa
OK so I am in the middle of a tow rig project and have to redo all the exhaust... what would be the right setup for me??? 351w SD with new comp cam (35-255-5) and totally rebuilt. I obviously want more flow but don't want to over do it. I am planning on hooker headers with 1.5 inlet and 2.5 collectors (found them on craigslist cheap). I am debating whether to do an x-pipe or X-pipe muffler, probably eliminating the cat. Just don't know what I want from headers back. True dual 2.5in all the way... Also as for the mufflers go I want a little rumbel but not much since I am probably dumping right in front of rear wheels. Anyone what to make suggestions??? I was thinking 2 cheaper mufflers would be easier and might be cheaper to run instead of having to buy a $100 muffler...
Postmaster
Joined: Jan 2009
Posts: 4,558
Likes: 2
The headers sound fine , 2 1/2 for duels should be good , H or X pipes for duels will help , if you can elimanate the cat thats good , mufflers are your choice , i like the super 44s....Lew
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Posting Guru
Joined: Jun 2003
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From: southwest michigan
Here's a question. Is it not so much the backpressure, as keeping the pipe not to big? so, let's say I had 2" duals, with no cats or muffler to make more backpressure. The smaller pipe would give more velocity, which is where scavenging comes from.
So would that above setup make more low end torque then 3" duals with more restrictive mufflers?
Just trying to clear up the difference between smaller pipes for velocity and actaull backpressure.
So would that above setup make more low end torque then 3" duals with more restrictive mufflers?
Just trying to clear up the difference between smaller pipes for velocity and actaull backpressure.
Postmaster
Joined: Mar 2008
Posts: 2,703
Likes: 7
From: Des Moines, Iowa
YEah I have heard some super 44s on youtube and like them alot too but the exhaust is going in a beat up old 88 F-250 Budget Truck so i was looking for the good sound with economical price... $70x2 mufflers is a little high for this ol' girl... you are right though lew I love those mufflers...
Postmaster
Joined: Jan 2009
Posts: 4,558
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Here's a question. Is it not so much the backpressure, as keeping the pipe not to big? so, let's say I had 2" duals, with no cats or muffler to make more backpressure. The smaller pipe would give more velocity, which is where scavenging comes from.
So would that above setup make more low end torque then 3" duals with more restrictive mufflers?
Just trying to clear up the difference between smaller pipes for velocity and actaull backpressure.
So would that above setup make more low end torque then 3" duals with more restrictive mufflers?
Just trying to clear up the difference between smaller pipes for velocity and actaull backpressure.
Postmaster
Joined: Dec 2007
Posts: 3,052
Likes: 1
From: Jacksonville FL
No cats. 2.25" true duals.
Posting Guru
Joined: Dec 2008
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From: Sterling, Va
That's why it had the raspy crackle sound to it not enough back pressure, same problem i had with mine before when it was just the cats and no muffler.
Hotshot
Joined: Sep 2001
Posts: 11,958
Likes: 228
That 86 sounds that way because it doesn't have cats and has shorter glasspacks.
For duals 2.25 is not too small and is not why its crackling and popping. Thats just the nature of short glass packs. It almost sounds like they are blown out packs.
For duals 2.25 is not too small and is not why its crackling and popping. Thats just the nature of short glass packs. It almost sounds like they are blown out packs.
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May 11, 2006 09:53 AM
