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Exhaust 5.7 HEMI Exhaust Discussion


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  #1  
Old 05-25-2012, 08:47 AM
JDawggie JDawggie is offline
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Question New Exhaust ....Strange noise

Hey all...I recently installed the Flowmaster American Thunder exhaust kit on my truck. I love the sound, but I am also hearing some strange "air - type" noises at certain RPMS with resognation (I also hear some sort of air sound upon start up). I did not get the pipe fittings welded....maybe there is a leak and this is causing the reverb/ air noise?? It only makes this noise at a certain RPMs (1800) --- Anyone have any experience with this and advice on how to correct?

Many thanks in advance,
Jared
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Old 05-25-2012, 10:14 AM
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thats the typical rpm's that exhausts drone...it is more so if piping isn't welded up or sealed so i would check everything again..
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Old 05-25-2012, 09:24 PM
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Thanks Fast Freddie --- I had an 01 Ram with Flowmasters and encounters no issues at all....Th "drone" at specific RPMs is noticeable, but not horrendous...the what sounds to be pocket of air every once in a while until I step on the throttle to clear it almost makes me feel there is a leak? Not sure...I think either way I will hold on to my stock exhaust. Really just wanted to be sure there was not back pressure issue etc that would damage the motor etc ...

Thanks,
Jared
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Old 05-25-2012, 10:02 PM
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are you runnin tips? after i made several changes to my exhaust i found that by dumping after axle, the drone went away. So that told me the drone was resonance in the piping after the muffler..
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Old 05-26-2012, 04:23 PM
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Question

OK you may think I am a DONKEY for asking this...but "drone" is just a low frequency noise....if I am hearing what sounds like a pocket of built up air followed by a psssst at a certain RPM...it is most likely an exhaust leak. I just wonder how common exhaust leaks are with using the "good" clamps with aftermarket exhaust... I actually had a chance to look / listen under the truck right where the muffler is and have another person hit the throttle a bit...I hear more of a pssst noise than a low frequency -- like it is trying to clear out something??.

However, the low frequency noise occurs at about 900 - 1200 RPM ...I just tap the throttle a bit to get it out of that range, but it seems to be followed by a pssssst air noise which makes me believe it is a leak...also when my truck was next to a building it did not sound like solid exhaust...this is tough to explain, but I am hoping someone has had the same issue and can advise if it is drone or more a leak because of the air-type of noise that follow the low frequency.

I am thinking it could be a leak -- and that would due fixed by getting it welded, but I just want to be sure before I weld it ...once welded it will be a bit more difficult to go back to stock.


Thanks,
Jared

Last edited by JDawggie; 05-26-2012 at 04:29 PM.
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Old 05-26-2012, 08:48 PM
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chock the tires, set the e brake
grab something like a tennis ball, apple, potato
start the engine
slide underneath while someone holds the object close to the exhaust tip, not tight against it

If there is a leak you will find it
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Old 05-27-2012, 10:05 AM
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Thanks GT -- I will give that a try -- that is the only thing that is completely bothering me at this point. -Jared
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Old 05-28-2012, 12:20 PM
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Exhaust leak for sure...started my truck up ...place my hand near one of the clamps and there i air spilling out. I did not even have any one pressing the throttle...so my guess is it would get worse before better under any sort of load.

I will most likely need to get these fittings welded up to correct this issue.
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