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  #13  
Old 02-01-2014, 05:36 AM
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Re: 2014 5.7 Muffler and resonator delete

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Originally Posted by Strongjeff View Post
Back pressure is a myth. Im running catless with a full flow thru exhaust and I picked up 8-10 mpg high way. The biggest reason for the loss in mpg is the driver wanting to hear the exhaust.
I guess i'm a Mythologist then lol. In all seriousness a tune or different size suitcase would surely fix his problem.
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Old 02-01-2014, 05:43 AM
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Originally Posted by MoparKing View Post

I guess i'm a Mythologist then lol. In all seriousness a tune or different size suitcase would surely fix his problem.
Id say tcm tune. Quicken the shifts and reduce the time the engine free runs
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Old 02-04-2014, 01:29 PM
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Re: 2014 5.7 Muffler and resonator delete

Uploaded diablo stock 91 tune. Very impressed. However the fart is still there in sport mode. Waiting on Sean to send me custom tune. If that's doesn't work I think I'm going to get the corsa and just cut the tips so I can use my stock summit tips. They fit to clean in the lower bumper to do anything else.
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Old 02-04-2014, 07:18 PM
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Originally Posted by Srt rob 69 View Post
Uploaded diablo stock 91 tune. Very impressed. However the fart is still there in sport mode. Waiting on Sean to send me custom tune. If that's doesn't work I think I'm going to get the corsa and just cut the tips so I can use my stock summit tips. They fit to clean in the lower bumper to do anything else.
You need to tune the tcm. Mainly by reducing torque management and speeding up shifts. Just speeding the shifts up wont cut it.
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Old 02-11-2014, 12:23 PM
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Re: 2014 5.7 Muffler and resonator delete

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Originally Posted by Strongjeff View Post
You need to tune the tcm. Mainly by reducing torque management and speeding up shifts. Just speeding the shifts up wont cut it.

Unfortunately the new diablo tune does not have that option yet for the 8 speed. I have Sean's custom tune loaded which works great, but still the farting. Weird thing though is it doesn't happen when the engine is cold in sport mode. However the second it warms up. Let the farts begin....
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Old 02-11-2014, 05:59 PM
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Originally Posted by Srt rob 69 View Post

Unfortunately the new diablo tune does not have that option yet for the 8 speed. I have Sean's custom tune loaded which works great, but still the farting. Weird thing though is it doesn't happen when the engine is cold in sport mode. However the second it warms up. Let the farts begin....
Thats normal. My exhaust on my 3.7 sounds better warm then it does cold.... it don't fart ever and im running headers, no cats, true duals. Its also very quiet until you get on it. But the fart sound, I've heard a lot of hemis do it, even a 4.7 with flowmaster did it to. Seen a 3.5 and 2.7 v6 do it. Its mostly a chrysler thing but ive seen older Chevy 350s do it. The 4.6 mustangs are bad for it especially the 2 valves.
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Old 02-12-2014, 07:16 PM
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So it's going to be sure that any 5.7 it's gonna fart by removing the resonator by using another aftermarket resonator or using xpipe?
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Old 02-12-2014, 07:23 PM
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Re: 2014 5.7 Muffler and resonator delete

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So it's going to be sure that any 5.7 it's gonna fart by removing the resonator by using another aftermarket resonator or using xpipe?
For the most part yes. A lot of factors go into it but one way to reduce it is to reduce the time the engine free runs. (The time between shifts) the common culprits for it are flowmasters. Every flowmaster equipped 5.7 I have heard did it. Now I havent heard a new 5.7 on the 8 speed, but the 6 speed is an updated version of the 545rfe, with one gear added. Its still slow shifting.
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  #21  
Old 02-12-2014, 07:25 PM
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Re: 2014 5.7 Muffler and resonator delete

Did you by any chance get a fly by or take off video?
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Old 02-12-2014, 07:30 PM
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Originally Posted by Strongjeff View Post
Did you by any chance get a fly by or take off video?
My GC steel stock but I'm reading as much as I can to get the perfect combination for my exhaust. I was thinking to keep the rear muffler, remove the resonator and instal an xpipe, but in other threat somebody recommends to get like a narrower resonators after the xpipe. So I'm confused about what it's best sound/not loosing power
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Old 02-12-2014, 07:36 PM
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Originally Posted by b_vs View Post
My GC steel stock but I'm reading as much as I can to get the perfect combination for my exhaust. I was thinking to keep the rear muffler, remove the resonator and instal an xpipe, but in other threat somebody recommends to get like a narrower resonators after the xpipe. So I'm confused about what it's best sound/not loosing power
I think that was me lol, I recommended a quality glasspack after the x pipe. Check out my build thread, im running glasspacks and magnaflows without the x. I have the x but I need to get state side to put it on. Keep in mind its on the 3.7.
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Old 02-12-2014, 07:38 PM
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Quote:
Originally Posted by Strongjeff View Post
I think that was me lol, I recommended a quality glasspack after the x pipe. Check out my build thread, im running glasspacks and magnaflows without the x. I have the x but I need to get state side to put it on. Keep in mind its on the 3.7.
Lol thanks for that again, can you post your build thread link please? Thanks in advance
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