Crazy rasp after TSP catless longtubes install

Discussion in 'V8 5.0L Engine / Mods: Bolt-ons, Exhaust, Tuning' started by damondewaynehuff84, Sep 6, 2019.

  1. damondewaynehuff84

    damondewaynehuff84 Active Member

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    So this week I installed my TSP catless longtubes. Before this i had muffler deletes and that's it. So now i have catless longtubes, stock resonator, and no mufflers and it is extremely raspy. So I'm looking for advice on hpipe and mufflers to weld in. I like the deep rumble of the older mustangs and looking to go more that route than the raspyness of the coyote. So what have you all used to get that deep rumble?
     
  2. BmacIL

    BmacIL Enginerd

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    Never gonna happen. This engine is what it is.

    Removing cats increases rasp. Put them back or add in significant length resonators.
     
  3. VooDooDaddy

    VooDooDaddy Banned

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    #3 VooDooDaddy, Sep 6, 2019
    Last edited: Sep 7, 2019
    Borla/Ford Performance resonator + AWE Touring axle-backs

    The FP resonator will go a long way toward killing the rasp and the AWE will give some of the 'old-school' muscle car sound.

    WTF anyone would completely delete the mufflers is beyond me? My guess is you are still in your 20's and you thought that would sound good?
     
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  4. OP
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    damondewaynehuff84

    damondewaynehuff84 Active Member

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    Actually no I'm 35 and it sounded great for the first year until I put the longtubes on this week. It's all personal preference. Not gonna really make much difference performance wise. The muffler deletes that every company sells aren't made for no reason. Obviously people like them. I didnt do this I just made my own but now need to go with mufflers because things have changed. So if you have a suggestion thanks. That's all I was asking for.

    I have thought about awe touring cause I've heard a lot of good things about them. But I see no need to spend that kinda money when I can just weld in mufflers. The resonators aren't a bad idea once I get the stock resonator off and an Hpipe put in its place. I know the hpipe will lower it a little. The stock resonator makes it sound like I have glass packs on there right now
     
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  5. BlackandBlue

    BlackandBlue Well-Known Member

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    I have heard of guys having luck with an H-pipe with weld in resonators. Some have welded resonators straight into the headers.

    I think you will have to go back with mufflers to get better sounds.

    The firing order on these cars isn’t conducive to producing the old muscle car sound. I did what is similar to a muffler delete and really like the sound. It seems to work very well with the stock resonator.

    Any 4.6 will always sound better in my opionion just because of firing order.
     
  6. kent0464

    kent0464 Well-Known Member

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    Raspiness......hmmmm pretty much any multivalve engine running straight pipe or a muffler at the end on the exhaust will have a raspy tone (ie Honda, Nissan, Porsche, etc). Only real fix are resonators or moving the mufflers in, away from the end of the exhaust run.
    Muscle car sound, most tend to forget muscle cars had the mufflers for the most part, before the rear axle under the passenger cabin and the interior exhaust noise and drone was just something we dealt with.
    Raspy goes with the new image of the mustang as a world class sports car and ford has moved away from mustang as a muscle car.
     
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  7. BmacIL

    BmacIL Enginerd

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    Having the muffler in the middle doesn't create drone. A muffler that doesn't attenuate the drone-causing frequencies (120-150 Hz typically) is what causes drone.
     
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  8. WildHorse

    WildHorse N/A or GO HOME

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    Really? Here's that flathead ford, which has the same firing order as the coyote.. sound pretty muscle car to me.
     
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  9. Jetnoise

    Jetnoise Well-Known Member

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    Did you save any of your oem stuff?
     
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  10. BlackandBlue

    BlackandBlue Well-Known Member

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    That is one sweet sounding motor. I have never compared the high Rpm sound of the flathead to the coyote. It’s pretty intesting how similar they sound.


    Coyote

    Flathead coyote

    I grew up with the sound of the 4.6 so I defiantly have some bias.


    All these motors sound awesome. That flathead has a great sound.
     
  11. BmacIL

    BmacIL Enginerd

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    Flatheads have very different flow compared with a modern engine, and they're also 2V per cylinder. Header design also changes tone significantly. The 4.6 engines have the old 4-to-1 cast header which makes for a distinct tone (LS engines similar) but isn't as good as the Tri-Y header of the Coyote for making power. Head design, valve count and design, VCT, header design and firing order all influence the frequency content going into the exhaust system. Even the intake manifold can have some effect.
     
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  12. hinch

    hinch Well-Known Member

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    i love the rasp of straight through no mufflers/resonators/cats etc just 3" from collectors back once you get right up the rpm it sounds glorious
     
  13. WildHorse

    WildHorse N/A or GO HOME

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    Haha my buddy did that to his s197. Most obnoxious sound ever.
     
  14. hinch

    hinch Well-Known Member

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    its the best sound ever deep popping rumble when just on tickover but really step on it make sure its on cam and the bark is very similar to gt/touring cars over here. no point in trying to make it sound like a classic it never will so take advantage of how it does sound.
     
  15. ForYourOwnGood

    ForYourOwnGood Well-Known Member

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    I have a custom setup with the CJPP center magnaflow X muffler and some borlas out back and it is DEEP at idle and lower RPM, where you feel it in your chest more than hear it, very strange for a coyote. Zero rasp or drone, but it does tend to mellow out and become very quiet over around 4000rpm. Just sounds like air moving.
     
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