Random Saturday question
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Lead Driver
Joined: Jan 2010
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Random Saturday question
I have noticed when accelerating at high RPM’s (high for me is 3,000 RPM) during an active regeneration the sound of the exhaust is significantly louder than it is normally.
I have noticed this a number of times when my right foot feels heavy during an AR (it doesn’t always).
It would sound cool with Epic’s new exhaust tips but the factory sounds like a jet engine during this time.
Normally, I can’t hear the exhaust that much.
Anyone have an idea what would cause the noise change?
Does the turbo behave differently even though boost still maxes out at 21 PSI?
Does something open to allow the exhaust to move more freely?
Has anyone noticed lately these trucks are awesome?
I have noticed this a number of times when my right foot feels heavy during an AR (it doesn’t always).
It would sound cool with Epic’s new exhaust tips but the factory sounds like a jet engine during this time.
Normally, I can’t hear the exhaust that much.
Anyone have an idea what would cause the noise change?
Does the turbo behave differently even though boost still maxes out at 21 PSI?
Does something open to allow the exhaust to move more freely?
Has anyone noticed lately these trucks are awesome?
Post Fiend
Joined: Jan 2009
Posts: 6,521
Likes: 11
From: Greenwood, SC
I know what you are describing. Yes, it does seem like the airflow during a regen is much louder under hard accel and also under heavy load at medium rpm, like speeding up a bit with a trailer in tow.
The sound is like a hair dryer on steroids. It is especially loud when you tow a fifth wheel, the front of the trailer really gets the sound back to you if the rear window is open.
I don't know why it would be so different than during normal engine operation. Maybe it's the EGR being by passed or being fully open? I think it's by passed during a regen but I'm not real sure, just a mild memory of that being pointed out by somebody somewhere.
The sound is like a hair dryer on steroids. It is especially loud when you tow a fifth wheel, the front of the trailer really gets the sound back to you if the rear window is open.
I don't know why it would be so different than during normal engine operation. Maybe it's the EGR being by passed or being fully open? I think it's by passed during a regen but I'm not real sure, just a mild memory of that being pointed out by somebody somewhere.
Senior User
Joined: Nov 2010
Posts: 376
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From: Tempe, AZ
I really don't want anybody to know I'm driving a $60,000.00 Ford F350 Hair Dryer.
Joe
Super Moderator
Joined: Aug 2003
Posts: 25,479
Likes: 738
From: Isanti, MN
I know what you're talking about and have thought about this before with no luck. But I just thought of something...
Ever think of the throttle body that's only used during regens? Much of the exhaust note can be affected by the air intake, and maybe the throttle body is partially closed even at WOT during regen? This would require sucking LOTS of air past a restrictive orifice, and maybe this could cause this noise.
Ever think of the throttle body that's only used during regens? Much of the exhaust note can be affected by the air intake, and maybe the throttle body is partially closed even at WOT during regen? This would require sucking LOTS of air past a restrictive orifice, and maybe this could cause this noise.
Junior User
Joined: Feb 2011
Posts: 91
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Could it be the extra fuel burning in the exhaust system during an active regen? Burning fuel heats the exhaust gases, causing them to expand in volume. That's what happens in a jet engine. Just a thought.
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Post Fiend
Joined: Apr 2004
Posts: 5,158
Likes: 35
From: North of Salt Lake City
Now that you mention it, I remember the change in exhaust tone during AR but I haven't noticed those sounds anymore. I know the exhaust change fixed the hair dryer/shop vac sound. With that gone, the change in engine sounds is more obvious. The truck just sounds more like a diesel when in regen mode. The exhaust sound just isn't part of the equation anymore. It's just a very consistent slightly lower and deeper sound all the way through the RPM range whether in AR or not.
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