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Exhaust 5.7 HEMI Exhaust Discussion


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  #11  
Old 03-07-2013, 03:39 PM
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Originally Posted by Chris b View Post
I hear cutouts are bad about leaking???
here is where 'you get what you pay for' comes into play...the cheap cutouts do leak..I've run my dmh's for 7 years and have no leaks (that I can smell)
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  #12  
Old 03-07-2013, 08:58 PM
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Originally Posted by HOTRODHARLEY View Post
Back pressure is a joke to us. We really don't need to be worried about back pressure. Pressure waves in our long systems make enough back pressure. Size it bigger always. 3" is a good decision for duals. and 3.5" or bigger for a single system.

Now a short system that dumps 2 feet after the header collectors will be lacking back pressure. But that's a different story....
The problem with this thinking is you've just lost all your exhaust velocity. The tuned LT headers maximize the scavenging effect which increases the exhaust's velocity, which you destroy by having exhaust piping that's too large in diameter. This isn't a diesel that's pushing high exhaust pressures and can flow effectively through a 4-5" diameter, it's a medium pressure system that must take velocity into account.

In low RPM scenarios you aren't pushing a whole lot of air volume, so you not only have to move the combustion chamber air through the system, but pull the air that's in the exhaust with it. To do this, you need pressure or velocity.
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  #13  
Old 03-07-2013, 10:01 PM
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3" dual will not lose velocity. It takes extremes to kill velocity. Like 4" or 5" dual. I've built many high end systems that say otherwise. And have timeslips that say otherwise. Not like people on here saying "oh my butt-o-meter" says otherwise.

Jut look at aftermarket SRT8 systems for a 420HP engine. It's all 3" and factory is 2-3/4"
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Old 03-07-2013, 11:23 PM
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I would say 3" duals with H pipe, imo

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  #15  
Old 03-07-2013, 11:40 PM
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But his isn't a high end system, Chris' is a moderately modded system. 3" is the highest he'd want to go before the muffler. A larger cube engine could see more advantage with larger exhaust, but not a stock displacement engine.

You rarely ever see an SRT8 running anything bigger than 3" unless they're running twins, I know I'm surrounded by them in my car club, including Ron's 1014hp chally that still runs a 3" system behind his F1C. Hell, my system will only be running 3" and I'll have 8-9psi and a 150 shot. I'm not turning this into a pissing contest of what we drive or who we know, but they myth of back pressure keeps being perpetuated, and it's wholly inaccurate.

Another difference between the 5.7L truck engine and the SRT8 is where the powerband lies. The trucks need the powerband lower than the cars due to the higher weight and bluffer aerodynamic body. While a larger exhaust diameter is ideal for a high rpm engine that moves a larger volume of air, it can also slow the exhaust's ability to expel gasses at lower RPMs because of the lower velocity; vice-versa, a narrow system will increase velocity and be great at lower RPMs but create a restriction at higher RPMs, which is where a set of cutouts comes in, as it can shorten the exhaust track and reduce the back pressure. It creates a cheater's way of duplicating the dual exhaust routing used by manufacturers like Ferrari. An exhaust system needs to be built for the intended driving habits of the vehicle, which for Chris is a DD with occasional track use, so why build a system that would require high RPMs to make use of his mods? If it was a track only build, then I'd be behind a larger exhaust in addition to a forged motor, TC, tranny, and tuning that would allow revving up to 8K.

Now, if you want a really good read about pipe diameters and velocity requirements, have a look at this thread, it's by far the best one I've come across in a long time. http://www.roadstarraider.com/index.php?topic=6767.0
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  #16  
Old 03-08-2013, 12:01 AM
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All I'm saying is people need to quit saying this is too big this is too small. There is more often then not a too small scenario than a too big one.

The dragstrip does not lie. ET's do not lie. I don't care about the all your articles on the internet.

A person is leaving alot on the table with high horsepower cars and way too small header/exhaust pipe ID's. Running in the 800HP plus territory means going from a 1-7/8" header/3" exhaust to a 2"-2 1/8" stepped header and a full 3.5" or 4" system will net serious gains. And those are proven results time and time again.

Why leave power on the table...? A guy has 1014HP and 3" ehaust... Ask him how much he spent making all that power... And then ask him would you not want to realize the full potential of that engine..? Send him my way and I'll build him a system that will make power over his 3" that will make his eyes open wiiiiddddeee....

I'm not saying every wankers stock half ton needs 3" dual exhaust... Thats not my point. My point is proven real world results that speak for themselves.

I do this shit for a living. What do you do CdnoilRAM..? Read through articles online..?
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  #17  
Old 03-08-2013, 12:25 AM
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I do this shit for a living. What do you do CdnoilRAM..? Read through articles online..?
I'm an aerospace engineer that majored in systems, structures, and launch vehicle design...that does all his own design and engine work...and worked on a formula SAE car team. Care to try again?

I don't just read articles online, I make serious efforts to help educate people on what realistically works best for their builds and future plans. Now, both Fred and I have been working with these trucks for a while and have come to know them pretty well.

The 1014hp car was built, tuned, and tested by Arrington. You might have heard of them, one the most respected companies building modern hemi engines powered vehicle with their roots in Nascar, so they MIGHT know a thing or two about our specific systems.

The build you're describing doesn't fit into anybody's plans for their trucks; it is a specific build for what amounts to a vehicle that would not be very road friendly, but does wonders at the strip. The system Fred and I have been talking about allows Chris to maintain his streetability but allow for sufficient flow and when he does go to the track. It's a more dynamic multipurpose system than a single large bore exhaust system would allow.

This has obviously turned into an internet d!ck measuring contest, and Chris, I apologize.
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  #18  
Old 03-08-2013, 12:45 AM
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Oh crap... Another engineer who can do it all. I've seen many "engineer" built cars. Such as the engineer built exhaust system with the oh so Red Deer esque chrome tips coming out the back. Nice pics bud.

Engineers can design and dream up. But real world execution is another story...
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  #19  
Old 03-08-2013, 12:50 AM
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Lets keep this one on topic PLEASE!
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  #20  
Old 03-08-2013, 02:48 AM
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This has obviously turned into an internet d!ck measuring contest, and Chris, I apologize.[/QUOTE]
You don't have to apologize to me cdnoilRAM. (we good)
Guess this guy didn't see, this op was about what I need for MY truck.
As much as we have talked, Im pretty sure you have a good idea of what im going for in my build. So any of your advice is greatly appreciated as always.
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