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Exhaust 5.7 HEMI Exhaust Discussion


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  #11  
Old 11-12-2012, 08:25 AM
arlockstedt arlockstedt is offline
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i drive 30 mins to and from work, but its only been a day or two. not even 100 miles on it yet. But it has gotten more responsive. That I can tell for sure. I know I cant be the only guy with this setup. It seems like the way to go and less headache for any exhaust shop. There is a video on you tube of a guy with an '11 and the same setup. He seems to be very happy with the sound and performance as well. I mean, I'm still running the same stock cats and resonators. I know its not anywhere the same of an open pipe.....it just re leaved a little back pressure for performance......
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  #12  
Old 11-12-2012, 08:27 AM
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Do you have a link to the YouTube link?
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  #13  
Old 11-12-2012, 08:40 AM
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he has 3 different videos.....
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  #14  
Old 11-12-2012, 10:46 AM
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Having drag raced Mopars for years, I can assure you that you can definitely have too much exhaust. It doesn't surprise me that you lost low-end power when going to a larger, more free-flowing exhaust. You will almost always lose bottom-end torque. Engines do require some back-pressure based on the rest of the combo in order to have enough scavenging for proper combustion. The only way around that is if you have the heads/intake/cam to make up for it. You could always add a higher-stall TC to try and make up for the loss in the bottom-end. The higher stall would get you up in RPMs past where you're losing the torque.

Throw a set of 3" true-duals from the heads back and remove the cats, regardless of which muffler. See how much bottom-end you have then. It'd just lay over and wanna die.

Scott
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  #15  
Old 11-12-2012, 11:25 AM
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You should not have lost low end with that setup. Your tail pipes are 2.25" which promotes high exhaust velocity. It's likely in you head IMO.
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  #16  
Old 11-12-2012, 01:41 PM
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Quote:
Originally Posted by Scotty85 View Post
Having drag raced Mopars for years, I can assure you that you can definitely have too much exhaust. It doesn't surprise me that you lost low-end power when going to a larger, more free-flowing exhaust. You will almost always lose bottom-end torque. Engines do require some back-pressure based on the rest of the combo in order to have enough scavenging for proper combustion. The only way around that is if you have the heads/intake/cam to make up for it. You could always add a higher-stall TC to try and make up for the loss in the bottom-end. The higher stall would get you up in RPMs past where you're losing the torque.

Throw a set of 3" true-duals from the heads back and remove the cats, regardless of which muffler. See how much bottom-end you have then. It'd just lay over and wanna die.

Scott
I've always been told/educated in your second sentence as being spot on.

However, your last paragraph, while you nailed it in theory, is NOT an astute move to undertake. Removal of catalytic convertors is a serious Federal and emissions violation that's just not worth the benefits in lure of the consequences should you be pinned.
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  #17  
Old 11-12-2012, 01:49 PM
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Without starting a pissing match, the back pressure thing is incorrect, although just about everybody and their mother believes it. Back pressure is always bad(yes, even for low end torque). The reason you'd lose low end torque with a full 3" dual setup is because you'd slow exhaust gas velocity tremendously with the larger diameter pipe. There's a balance to find the proper pipe diameter to achieve the most volumetric flow at the highest velocity. With too big a diameter you reduce velocity, but with too small a diameter you choke the engine. Back pressure has nothing to do with scavenging. Higher velocity will yield more scavenging effect.
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  #18  
Old 11-12-2012, 01:54 PM
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Quote:
Originally Posted by snrusnak View Post
Without starting a pissing match, the back pressure thing is incorrect, although just about everybody and their mother believes it. Back pressure is always bad(yes, even for low end torque). The reason you'd lose low end torque with a full 3" dual setup is because you'd slow exhaust gas velocity tremendously with the larger diameter pipe. There's a balance to find the proper pipe diameter to achieve the most volumetric flow at the highest velocity. With too big a diameter you reduce velocity, but with too small a diameter you choke the engine. Back pressure has nothing to do with scavenging. Higher velocity will yield more scavenging effect.
You're gonna' start a pissing match, Sean.

.....
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  #19  
Old 11-12-2012, 01:56 PM
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Quote:
You're gonna' start a pissing match, Sean.
LOL I know....but I feel the need to at least attempt to spread information...
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  #20  
Old 11-12-2012, 02:10 PM
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Scotty85 Scotty85 is offline
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Quote:
Originally Posted by Grubrunner View Post
I've always been told/educated in your second sentence as being spot on.

However, your last paragraph, while you nailed it in theory, is NOT an astute move to undertake. Removal of catalytic convertors is a serious Federal and emissions violation that's just not worth the benefits in lure of the consequences should you be pinned.
Federal regulations was 100% NOT the point. And I'd just as soon not argue the other points, but I will pose just one question from that last post....

So, by that last post, you'd expect, on a stock vehicle, open exhaust to perform better than stock exhaust..... at the track? Craziness. I'd love to line you up one day in my car.

Scott
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Last edited by Scotty85; 11-12-2012 at 02:15 PM.
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