Why doesn’t my Magnum 5.9 sound good?
#2598768
12/30/18 01:32 PM
12/30/18 01:32 PM
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Joined: Nov 2013
Posts: 111 Connecticut, USA
MRGTX
OP
member
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OP
member
Joined: Nov 2013
Posts: 111
Connecticut, USA
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This is a subjective thing but I think most of us know a good sounding V8 when we hear one. My engine is an old Magnum 300 crate engine. Demon 650 carb, Mopar M2 dual plane intake, Doug’s headers, Jones Max Flow flow-through mufflers, no cross-over pipe.
Obviously I’ve got a pretty mild cam and low compression...but something just doesn’t sound right. The exhaust seems kinda flat...no crispness or rumble, even at WOT. I didn’t want the echoey/hollow sound from Flowmaster type mufflers and I thought the flow through mufflers would have been the key to getting some sharper/better sound...but did I just pick the wrong style muffler?
Or...could this be a symptom of something else? Maybe it’s a timing/tune issue? The motor pulls ok but it’s not even close to the stock 5.0 Coyote in my Mustang...which has more hp but less (advertised) torque and in a much heavier car.
Any input is welcome.
Last edited by MRGTX; 12/30/18 01:33 PM.
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Re: Why doesn’t my Magnum 5.9 sound good?
[Re: MRGTX]
#2598777
12/30/18 01:42 PM
12/30/18 01:42 PM
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Joined: Sep 2007
Posts: 14,889 up yours
Supercuda
About to go away
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About to go away
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up yours
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You have a broomstick for a cam. The 380hp version of that engine was essentially a cam and intake swap you might consider that. https://www.hotrod.com/articles/mopp-0303-360-crate-engine-buildup/
They say there are no such thing as a stupid question. They say there is always the exception that proves the rule. Don't be the exception.
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Re: Why doesn’t my Magnum 5.9 sound good?
[Re: MRGTX]
#2598783
12/30/18 01:59 PM
12/30/18 01:59 PM
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Joined: Mar 2005
Posts: 1,406 New Jersey, USA
yella71
pro stock
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pro stock
Joined: Mar 2005
Posts: 1,406
New Jersey, USA
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that motor is not going to run ANYTHING like your coyote 5.0....as said you have a broom stick. up the compression and put a big cam in if you want some rumble that has power to back it up.
71 challenger convertable, 64 sport fury 383 ci with factory air
99 sebring convertable
89 CTD pup
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Re: Why doesn’t my Magnum 5.9 sound good?
[Re: MRGTX]
#2598788
12/30/18 02:09 PM
12/30/18 02:09 PM
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Joined: Sep 2007
Posts: 14,889 up yours
Supercuda
About to go away
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About to go away
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Posts: 14,889
up yours
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No need to up the compression. As I said, the 380hp version is nothing more than a production line truck 5.9 with a cam and single plane intake swap. the 300hp version is a dual plane intake swap only.
Read the link for tuning details and dyno info on the 380hp version.
They say there are no such thing as a stupid question. They say there is always the exception that proves the rule. Don't be the exception.
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Re: Why doesn’t my Magnum 5.9 sound good?
[Re: MRGTX]
#2598832
12/30/18 03:26 PM
12/30/18 03:26 PM
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Joined: Jan 2003
Posts: 20,179 Park Forest, IL
slantzilla
Too Many Posts
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Too Many Posts
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Posts: 20,179
Park Forest, IL
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I've had 2 5.9 trucks and my friends have also had a few. Every one of them sounded weird at idle like they had a burnt valve or something, especially with a non stock exhaust on them.
"Everybody funny, now you funny too."
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Re: Why doesn’t my Magnum 5.9 sound good?
[Re: slantzilla]
#2598856
12/30/18 04:27 PM
12/30/18 04:27 PM
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Joined: Jan 2003
Posts: 8,668 Buford, GA
I_bleed_MOPAR
master
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master
Joined: Jan 2003
Posts: 8,668
Buford, GA
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My Durango has a Cherry Bomb- Flowmaster copy installed by the PO. Sounds pretty good at idle but the drone at cruise and crackle when I let off is getting to me. I'm going to try the short-glasspack-for-a-resonator trick to quiet it down some. To me, it sounds like most any other stock vehicle with Flowmasters. Tim
'71 Charger 383/727 '17 Challenger SXT (Wifeys car )
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Re: Why doesn’t my Magnum 5.9 sound good?
[Re: MRGTX]
#2598877
12/30/18 05:47 PM
12/30/18 05:47 PM
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Joined: Jan 2003
Posts: 8,396 Highland, MI.
Sunroofcuda
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master
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Posts: 8,396
Highland, MI.
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I just looked at the internal view of the Jones Max Flow. It's a knock-off of a Magnaflow, which is a knock-off of a Dynomax Ultra Flow Welded. None of those mufflers do ANY tuning at all - none. They are just straight-through resonators basically - similar to a glasspack, but oval. Plus they all have a smooth round perf core - the only way they get loud is when you are at WOT. They sound "flat." If you run the right aggressive mufflers that do some tuning, you'll get sound.
No Man With A Good Car Needs To Be Justified
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Re: Why doesn’t my Magnum 5.9 sound good?
[Re: Sunroofcuda]
#2599089
12/31/18 04:57 AM
12/31/18 04:57 AM
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Joined: May 2003
Posts: 969 manitoba canada
BleedDodge
super stock
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super stock
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manitoba canada
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None of those mufflers do ANY tuning at all - none. They are just straight-through resonators basically - similar to a glasspack Ok so like a powerstick then I guess ? Or what.
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Re: Why doesn’t my Magnum 5.9 sound good?
[Re: BleedDodge]
#2599366
12/31/18 07:16 PM
12/31/18 07:16 PM
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Joined: Jan 2003
Posts: 8,396 Highland, MI.
Sunroofcuda
master
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master
Joined: Jan 2003
Posts: 8,396
Highland, MI.
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None of those mufflers do ANY tuning at all - none. They are just straight-through resonators basically - similar to a glasspack Ok so like a powerstick then I guess ? Or what. Mine do tune the exhaust. There are others that "tune" also - like Dynomax Super Turbos, Flowmasters, Cherry Bomb Vortex, Borla, etc.
No Man With A Good Car Needs To Be Justified
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