what do you guys think??
Thread Starter
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Cargo Master
Joined: Feb 2010
Posts: 3,493
Likes: 3
From: NY
what do you guys think??
I am thinking of this setup as far as exhaust goes. Tell me what you guys think....
I was thinking of a custom bent 2.5 inch pipe from the manifold welded into a collector(2.5 in inlets into a 3.5 outlet). Then 3.5 inch exhaust tubing into a 3.5 inch dynomax muffler and then 3.5 inches to the back and out the tailpipe.
Am I making the Y connection to restrictive or small?? Am I right in believing that 2.5 inches for a down pipe is large enough for this engine?? I hate to always bring up this issue, but I wanna do it right and only once.
Also, A friend of mine was telling me I should be carful about opening up the exhaust because I would lose back pressure. He said usually when you gain power in one end, you lose in the other. I told him I thought only 2 strokes needed back pressure, but he told me all engines do. Now I know this guy isn't ignorant he went to school for mechanics and has been doing for at least 25 years. But I heard alot on here you don't want back pressure at all for these engines. Is this truck different or something??
Thanks, snapon
I was thinking of a custom bent 2.5 inch pipe from the manifold welded into a collector(2.5 in inlets into a 3.5 outlet). Then 3.5 inch exhaust tubing into a 3.5 inch dynomax muffler and then 3.5 inches to the back and out the tailpipe.
Am I making the Y connection to restrictive or small?? Am I right in believing that 2.5 inches for a down pipe is large enough for this engine?? I hate to always bring up this issue, but I wanna do it right and only once.
Also, A friend of mine was telling me I should be carful about opening up the exhaust because I would lose back pressure. He said usually when you gain power in one end, you lose in the other. I told him I thought only 2 strokes needed back pressure, but he told me all engines do. Now I know this guy isn't ignorant he went to school for mechanics and has been doing for at least 25 years. But I heard alot on here you don't want back pressure at all for these engines. Is this truck different or something??
Thanks, snapon
Cargo Master
Joined: Feb 2008
Posts: 3,409
Likes: 1
From: back in SE Iowa
if you can go bigger than 2.5" downpipe its better but as far as your buddy saying not to open the exhaust that is incorrect,my truck is running a 5" straight pipe after the crossover pipe when i opened my exhaust and intake i noticed a pretty good difference in power and mileage gains
Cargo Master
Joined: Feb 2008
Posts: 3,409
Likes: 1
From: back in SE Iowa
oh i assumed you did being you said 2.5"downpipe.being you dont have a turbo i would open the exhaust with mufflers cause n/a is loud straight piped.then open up the intake to bring in some more air
Thread Starter
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Cargo Master
Joined: Feb 2010
Posts: 3,493
Likes: 3
From: NY
And did you change the stock exhaust or you just dumped the muffler??
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Methanoholic
Joined: Mar 2009
Posts: 6,442
Likes: 8
From: Maine (NorCal Native)
Anything over 3" is a waste on a N/A, 3.5" Turbo'ed
Not that it'll hurt to go bigger, IMO bigger the better to a point, larger sounds sweeter!
If one does the math, even 3" is to big for a N/A and 3.5" for Turbo'ed.
You cannot fit anything larger then 2.25" to the exhaust manifolds, run 2.25" from the exhaust manifolds to the Y, at the Y blend them both into 3" or 3.5" if you ever plan (or think you might) go Turbo, then you don't have to re-do the complete system if you do Turbo.
The key word here is BLEND!
Ensure both 2.25" headers are already pointing towards the rear of the truck before blending into the 3" or 3.5" ... This makes for a non restrictive blend.
Back pressure versus no back pressure is a battle thats been going on for many many years ... It really depends on the whole package, typically Diesels benefit from no back pressure.
Yup, Two cycles MUST have a specific (and to each motor, everyone is different) back pressure to run correctly, this is why sometimes a dent in the expansion chamber can improve performance or impede, expansion chamber manufactures have to build off an average.
-Enjoy
fh : )_~
Not that it'll hurt to go bigger, IMO bigger the better to a point, larger sounds sweeter!
If one does the math, even 3" is to big for a N/A and 3.5" for Turbo'ed.
You cannot fit anything larger then 2.25" to the exhaust manifolds, run 2.25" from the exhaust manifolds to the Y, at the Y blend them both into 3" or 3.5" if you ever plan (or think you might) go Turbo, then you don't have to re-do the complete system if you do Turbo.
The key word here is BLEND!
Ensure both 2.25" headers are already pointing towards the rear of the truck before blending into the 3" or 3.5" ... This makes for a non restrictive blend.
Back pressure versus no back pressure is a battle thats been going on for many many years ... It really depends on the whole package, typically Diesels benefit from no back pressure.
Yup, Two cycles MUST have a specific (and to each motor, everyone is different) back pressure to run correctly, this is why sometimes a dent in the expansion chamber can improve performance or impede, expansion chamber manufactures have to build off an average.
-Enjoy
fh : )_~
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Thread Starter
|
Cargo Master
Joined: Feb 2010
Posts: 3,493
Likes: 3
From: NY
Anything over 3" is a waste on a N/A, 3.5" Turbo'ed
Not that it'll hurt to go bigger, IMO bigger the better to a point, larger sounds sweeter!
If one does the math, even 3" is to big for a N/A and 3.5" for Turbo'ed.
You cannot fit anything larger then 2.25" to the exhaust manifolds, run 2.25" from the exhaust manifolds to the Y, at the Y blend them both into 3" or 3.5" if you ever plan (or think you might) go Turbo, then you don't have to re-do the complete system if you do Turbo.
The key word here is BLEND!
Ensure both 2.25" headers are already pointing towards the rear of the truck before blending into the 3" or 3.5" ... This makes for a non restrictive blend.
Back pressure versus no back pressure is a battle thats been going on for many many years ... It really depends on the whole package, typically Diesels benefit from no back pressure.
Yup, Two cycles MUST have a specific (and to each motor, everyone is different) back pressure to run correctly, this is why sometimes a dent in the expansion chamber can improve performance or impede, expansion chamber manufactures have to build off an average.
-Enjoy
fh : )_~
Not that it'll hurt to go bigger, IMO bigger the better to a point, larger sounds sweeter!
If one does the math, even 3" is to big for a N/A and 3.5" for Turbo'ed.
You cannot fit anything larger then 2.25" to the exhaust manifolds, run 2.25" from the exhaust manifolds to the Y, at the Y blend them both into 3" or 3.5" if you ever plan (or think you might) go Turbo, then you don't have to re-do the complete system if you do Turbo.
The key word here is BLEND!
Ensure both 2.25" headers are already pointing towards the rear of the truck before blending into the 3" or 3.5" ... This makes for a non restrictive blend.
Back pressure versus no back pressure is a battle thats been going on for many many years ... It really depends on the whole package, typically Diesels benefit from no back pressure.
Yup, Two cycles MUST have a specific (and to each motor, everyone is different) back pressure to run correctly, this is why sometimes a dent in the expansion chamber can improve performance or impede, expansion chamber manufactures have to build off an average.
-Enjoy
fh : )_~
Methanoholic
Joined: Mar 2009
Posts: 6,442
Likes: 8
From: Maine (NorCal Native)
Merriam-Webster's definition of the word Blend
To elaborate ... So they flow smoothly, no sharp bends or obstructions in the transition.
The Flanges that hold the header pipe to the manifold cannot accept anything larger then 2.25" ...
Yes, You could use 2.25" then upsize to 2.5" ... Ignorant!
2.25" is enough for each bank!
-Enjoy
fh : )_~
To elaborate ... So they flow smoothly, no sharp bends or obstructions in the transition.
The Flanges that hold the header pipe to the manifold cannot accept anything larger then 2.25" ...
Yes, You could use 2.25" then upsize to 2.5" ... Ignorant!
2.25" is enough for each bank!
-Enjoy
fh : )_~
Thread Starter
|
Cargo Master
Joined: Feb 2010
Posts: 3,493
Likes: 3
From: NY
Merriam-Webster's definition of the word Blend
To elaborate ... So they flow smoothly, no sharp bends or obstructions in the transition.
The Flanges that hold the header pipe to the manifold cannot accept anything larger then 2.25" ...
Yes, You could use 2.25" then upsize to 2.5" ... Ignorant!
2.25" is enough for each bank!
-Enjoy
fh : )_~
To elaborate ... So they flow smoothly, no sharp bends or obstructions in the transition.
The Flanges that hold the header pipe to the manifold cannot accept anything larger then 2.25" ...
Yes, You could use 2.25" then upsize to 2.5" ... Ignorant!
2.25" is enough for each bank!
-Enjoy
fh : )_~
so I'll do 2.25/3.0 Y then i'll i'l put a 3.0/3.5 reducer and 3.5 all the way to the back, thanks.
Methanoholic
Joined: Mar 2009
Posts: 6,442
Likes: 8
From: Maine (NorCal Native)
If you're running 3.5" out, then blend 2.25" into 3.5" ...
Best thing to do if you cannot build it yourself is take it to a muffler shop and have them do it ... I believe someone mentioned having the same basic setup done for around $350.
Your biggest problem may be the 3.5", many shops can only go up to 3", but that may also depend on ones location.
-Enjoy
fh : )_~
Best thing to do if you cannot build it yourself is take it to a muffler shop and have them do it ... I believe someone mentioned having the same basic setup done for around $350.
Your biggest problem may be the 3.5", many shops can only go up to 3", but that may also depend on ones location.
-Enjoy
fh : )_~
Cargo Master
Joined: Nov 2003
Posts: 2,585
Likes: 1
From: Duluth, Mn.
I keep posting the Auto Jet exhaust link for Peeps.
The system comes with a very nice MANDREL bent Y-Pipe. for a VERY good price. Better than any local Guy is going to do for You.
truck exhaust - light duty
Click LD3
Around $350 for the complete system
The system comes with a very nice MANDREL bent Y-Pipe. for a VERY good price. Better than any local Guy is going to do for You.
truck exhaust - light duty
Click LD3
Around $350 for the complete system