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Exhaust 5.7 HEMI Exhaust Discussion


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  #21  
Old 05-14-2014, 08:52 AM
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Yeah I'm just saying that I don't think there's a substantial difference between an open exhaust(cutouts) vs a straight through muffler. A straight through muffler is just a perforated pipe, there's a little turbulence created(restriction) but it's very little. I'd bet(just guessing) the guys who experience faster track times or more power with the cutouts open don't have straight through mufflers. They probably have chambered mufflers which are a bit more restrictive. But I don't really know, and I doubt anyone will ever do real testing to compare as it's not worth the time/money.
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  #22  
Old 05-14-2014, 08:59 AM
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But then also take into consideration the extra length of pipe, plus the bends to go up and over the axel, I cannot say if that would add much difference or not.
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  #23  
Old 05-14-2014, 09:08 AM
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That's minor. Especially if all mandrel bent.
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  #24  
Old 05-18-2014, 03:04 PM
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Anyone know of a way to easily test performance (besides a dyno)? Ill be ordering a mufflex muffler delete, and was wondering if there was a way to test the truck before and after. I know a few dead highways in the area so I could use the same chunk of road for both tests. I was thinking the Android app Torque, and using the record feature, Figured it could give a rough estimate. Would be interested to see kind of how much a difference just the muffler would do, if any. Obviously a dyno would be ideal, but Im not wasting money on that. Im just looking for ball park here.
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  #25  
Old 05-18-2014, 10:30 PM
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when I thought up my exhaust system i wanted to do big pipes (and I did)...but, I was worried about it being too open that it would affect scavenging and exhaust pulses.. So what I did was run 3" piping from the header collectors all the way to the muffler which is a dual 3" in/single 3.5" out...because i was worried about the bigger flow characteristics I decided to to do the single out (turned my muffler 180 degrees)...I also added an H pipe where normally the Y pipe would be (again, to help balance the pulses)...now, this works for me because of the other mods I have so I really wouldn't suggest it unless your cammed and running headers..


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  #26  
Old 06-04-2014, 03:46 PM
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So with all this talk about back pressure, velocity etc.... I'd like to bring up a worry i have regarding valves since they are affected by back pressures. I might be getting off subject here, but would these pressures effect your valves enough to stay with certain exhaust systems. I myself, am thinking of deleting my factory muffler, adding a Y pipe, but keeping the resonators on towards the end of my exhaust. I have small strait through resonators on my 14' Ram. I'd like to have the loudness of the strait pipe but drown out the raspiness of the exhaust with the resonators. Do you think this would effect my valves in the long run.
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  #27  
Old 06-04-2014, 08:52 PM
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I guess I don't haveenough knowledge on the internal workings of the motors to understand how's back pressure and velocity would negatively affect the Valves? can't say that I've heard of any issues, Then again I'mnot a certified mechanic
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  #28  
Old 06-04-2014, 10:09 PM
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why do you say they effect the valves?
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