Exhaust question
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From: Milroy, PA
Exhaust question
How come the pre SD powerstrokes dont have the "exhaust flutter" that the SD trucks do? I ask because i like the way the pre SD trucks sound straight piped, because it sounds more like a v8, and most SD trucks i hear around here have a flutter in the exhaust? Is it the way the turbo is or what is it? I would really like to put exhaust on my truck, just dont want the flutter to be there.... what do yall think?
Postmaster
Joined: Jun 2005
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From: New Hampshire
It's the turbo chopping the exhaust pulses. An Aeroturbine 4040L muffler/resonator will give a nice sound with deep rumble and no choppy
sound. It is about $250 and pricey but a nice unit. That's for a 4" exhaust.
U can replace your stock muffler with one or u can go cheaper with the Walker
Big Truck muffler(aka BTM). Keep in mind once u remove the stock muffler or system with a performance system u may wind up with in-cab drone which
can be real annoying. If u think flutter is annoying try big doses of drone.
Nut
sound. It is about $250 and pricey but a nice unit. That's for a 4" exhaust.
U can replace your stock muffler with one or u can go cheaper with the Walker
Big Truck muffler(aka BTM). Keep in mind once u remove the stock muffler or system with a performance system u may wind up with in-cab drone which
can be real annoying. If u think flutter is annoying try big doses of drone.
Nut
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From: Milroy, PA
So any idea why the pre SD powerstrokes do not seem to have the flutter? I figured they were a pretty similar motor? Drone is kinda an issue as i drive around 700-1000 miles a week on the road for work. What about straight pipe, does it seem to have the flutter? I heard a 6.0 last night, that was straight piped, and the whistle from the turbo though the exhaust was incredible, it didnt seem to have the flutter but then again he didnt really get on it, but just moseyin around at just above idle it was incredibly loud turbo sound.
Smokin
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I have a 7.3 with turbo back exhaust and I still have flutter, especially at constant running speed/Idle of about 35-45 MPH. It's sort of like a high pitch hummingbird sound, similar to the sound a Volkswagen beetle makes all the time? Just to be sure we are talking about the same sound.
Correct me if I am wrong but this sound has something to do with the type of turbo you've got.
I don't mind flutter, especially since I can only hear it when I am in the cab of my truck with the windows open. Anyone standing on the outside of the truck just hears motor and turbo.
Correct me if I am wrong but this sound has something to do with the type of turbo you've got.
I don't mind flutter, especially since I can only hear it when I am in the cab of my truck with the windows open. Anyone standing on the outside of the truck just hears motor and turbo.
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From: Milroy, PA
Yea, high pitched hummingbird sound is a good explanation of the flutter, but any ideas as to why the 96?-98 powerstrokes dont do that? do they have a different turbo then the 99-03s?
Post Fiend
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From: 21791
yes, they have a non-wastegated 1.15 A/R exhaust housing, and a smaller 1.10A/R compressor housing. the pedestal design is WAY different. you may not be calling "flutter" what i call flutter, but i consider it the choppy hiss/whistle noise in the exhaust tone, most prevalent on an open exhaust system right off idle. when i pull away and start to raise RPMs slowly i really hear all the sounds with my "super-straight pipe" temporary exhaust system. i wish i had some way of letting you listen to the sound. i know some people call the chuffa chuffa chuffa noise when surge is happening (high boost/load condition) they call it "flutter", when it is actually surge. we all have so many terms for so many things, its hard to keep them straight.
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From: Milroy, PA
Originally Posted by strokin_it7.3
yes, they have a non-wastegated 1.15 A/R exhaust housing, and a smaller 1.10A/R compressor housing. the pedestal design is WAY different. you may not be calling "flutter" what i call flutter, but i consider it the choppy hiss/whistle noise in the exhaust tone, most prevalent on an open exhaust system right off idle. when i pull away and start to raise RPMs slowly i really hear all the sounds with my "super-straight pipe" temporary exhaust system. i wish i had some way of letting you listen to the sound. i know some people call the chuffa chuffa chuffa noise when surge is happening (high boost/load condition) they call it "flutter", when it is actually surge. we all have so many terms for so many things, its hard to keep them straight.
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Post Fiend
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From: 21791
aww man, that is one of the best sounds i think my truck can make! how do you not like that...? 
to answer your question- no, i believe the 1.15 turbo actually helped it some. there is less restriction for the exhaust to spin the wheel, so you get alot more engine pulse sounds getting sliced and diced up by the turbine wheel. plus there is no EBPV valve in the way to straighten exhaust. if i lug the engine at low speeds, you can actually see the smoke pour out of the exhaust pipe, still spinning in the direction of the flow of the turbine wheel.
i think part of the reason that the 94.5-97 trucks dont flutter as much is because their downpipe is flattened out like a pancake to about one inch thick or so because it will not clear the firewall. that restriction hurts sound as much as flow. the cat and the muffler also help deaden sound.
my buddy with a 97 stroker came to my house to pick up the tailpipe of my 4" system, and when he left i could hear some turbo whistle and flutter as he slowly pulled away from the shop. he does have a 3" downpipe, however he has a muffler and cat converter still too.
to answer your question- no, i believe the 1.15 turbo actually helped it some. there is less restriction for the exhaust to spin the wheel, so you get alot more engine pulse sounds getting sliced and diced up by the turbine wheel. plus there is no EBPV valve in the way to straighten exhaust. if i lug the engine at low speeds, you can actually see the smoke pour out of the exhaust pipe, still spinning in the direction of the flow of the turbine wheel.
i think part of the reason that the 94.5-97 trucks dont flutter as much is because their downpipe is flattened out like a pancake to about one inch thick or so because it will not clear the firewall. that restriction hurts sound as much as flow. the cat and the muffler also help deaden sound.
my buddy with a 97 stroker came to my house to pick up the tailpipe of my 4" system, and when he left i could hear some turbo whistle and flutter as he slowly pulled away from the shop. he does have a 3" downpipe, however he has a muffler and cat converter still too.
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From: Milroy, PA
well i think im going to be buying the ebpv delete housing, i cant remember the manufacturer off the top of my head but it was around 150, then 4" back exhaust, straight pipe to be determined, we put a mbrp on my bosses truck, but i dont like the diagonal exit that his has, i like the look of the stock pipe so maybe ill have one bent up locally. My ebpv sticks in the winter, so i figure what a better reason to remove it and get better flow!
Post Fiend
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From: 21791
Gillett Diesel makes that housing. getting it from Long Island Perf. Diesel?
Chad (catman963) has that setup on his BB turbo.
you will still have the flutter, i hope you know. the Aeroturbine 4040 like Nut said will help cut down on all of the whistling and fluttering noise.
Chad (catman963) has that setup on his BB turbo.
you will still have the flutter, i hope you know. the Aeroturbine 4040 like Nut said will help cut down on all of the whistling and fluttering noise.
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