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Exhaust 5.7 HEMI Exhaust Discussion


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  #21  
Old 11-12-2012, 03:14 PM
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So, by that last post, you'd expect open exhaust to perform better than stock exhaust..... at the track? Craziness. I'd love to line you up one day in my car.
This depends what you mean by "open exhaust". If you mean open headers, then no, that's not what I'm saying(you'd have extremely low exhaust gas velocity and lose torque as compared to stock). If you mean free flowing exhaust(no cats, no muffler) with appropriately sized pipe(say 2.5" for the hemi if running duals) then yes this would greatly out perform the stock exhaust at any rpm.
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  #22  
Old 11-12-2012, 03:17 PM
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I would ALMOST agree. But your post made it sound like "the larger, the better, why not open?" This is definitely not always the case.
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  #23  
Old 11-12-2012, 03:20 PM
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No, sorry wasn't trying to say that at all. Just saying it's a misconception that back pressure is good. Back pressure is not good. A lot of people will do something like take a stock v6 mustang(or even a v8 car/truck, whatever) and put dual 3" pipes on it and notice a loss in torque(primarily low rpm) and say it's due to not enough back pressure. This is not right. The loss in torque is because the pipe is WAY over sized, and exhaust gas velocity slows down with larger pipe(assuming same amount of flow, or in other words same power coming out of the engine). With less exhaust gas velocity you have less scavenging, less torque, less hp...
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  #24  
Old 11-12-2012, 03:25 PM
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Agreed. (I chose the wrong words... my bad)

But you CAN overcome the loss of velocity to a certain degree by adding a good X-Pipe. (not y-pipe)

Example.... My car runs .2 better WITH exhaust than with open headers. And we're talking deep-10's. I have step-tube headers going into 3" mandrel bent pipe w/X into Dynomax UltraFlows that dump at the axle.
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  #25  
Old 11-12-2012, 03:28 PM
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Yeah free flowing exhaust sized appropriately would definitely out perform open headers.

Something that baffles me is why dragsters run open headers. I can only assume at the power levels they are at, and the extremely high cylinder pressures pumping exhaust out of the heads, that any benefits of scavenging are negligible...
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  #26  
Old 11-12-2012, 03:32 PM
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Oh definitely. Totally different ballgame when you get much over 800-1000 HP. At that point, I'd think anything beyond the headers would hurt it.
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  #27  
Old 11-12-2012, 04:05 PM
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I have the latter of the two choices, 3" from where the Y pipe was back to where the the factory duals split. With the 22" magnaflow tru-x in there too. I felt no loss in power, just a whole lot better sound
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  #28  
Old 11-12-2012, 04:09 PM
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^That's good, that's same diameter's as stock. They set up the exhaust very good factory actually, just a restrictive muffler, y pipe, and manifolds.
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  #29  
Old 11-12-2012, 09:22 PM
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Again, it feels much stronger now. They went 2.5" from the cats to the 18" Magnaflow Tru-x ( 18in muffler with a built in x-pipe), then out the 2.25 factory duals.....no drone and its a really nice sounding exhaust.
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