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dumping jardine exhaust

Discussion in '4 Cylinder' started by beastlytaco, Sep 18, 2009.

  1. Sep 18, 2009 at 2:00 PM
    #1
    beastlytaco

    beastlytaco [OP] This is TW. One never knows what is a joke anymore

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    im thinking of dumping my exhaust before the axel. now my question is, will i lose power by doing this? will back pressure lossen up alot? or will it still be the same. also, would i have to worry about possible discoloration or harmful fumes coming into the cab like this?
     
  2. Sep 18, 2009 at 2:27 PM
    #2
    InfidelTaco

    InfidelTaco No better friend,No worse enemy...

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    i dont know about the back pressure, but its gonna be a whole lot louder. fumes not so much, only if ur sitting there for a long period of time. i had my magnaflow dumped b4 the axel and hated it. took her back and relocated to dump after the axel. sounds a whole lot better. did notice a change in power. hope this helps.

    G
     
  3. Sep 18, 2009 at 2:27 PM
    #3
    beastlytaco

    beastlytaco [OP] This is TW. One never knows what is a joke anymore

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    was the power a good increase or a bad decrease?
     
  4. Sep 18, 2009 at 2:40 PM
    #4
    InfidelTaco

    InfidelTaco No better friend,No worse enemy...

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    My apologize brother, typo. meant to put "didnt". Just a change in sound.

    G
     
  5. Sep 18, 2009 at 2:43 PM
    #5
    Untamed_SS

    Untamed_SS Stayed Up Too Late

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    I have a dump before the axle. Every once in a while it is "annoying" but only if you have a soft voiced female in the passenger seat and you can't hear her. Other than that, the music covers it up for me.



    Oops. Don't know if the engine makes much a difference, but you get what I mean anyways right. :D
     
  6. Sep 18, 2009 at 4:34 PM
    #6
    crawl

    crawl Well-Known Member

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    sounds about right to me :D
     
  7. Sep 18, 2009 at 4:54 PM
    #7
    crawl

    crawl Well-Known Member

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    stop this line of thinking dude. as I said before in another thread, no amount of backpressure is good. Backpressure is an "oldschool" theory that no longer applies to modern motors with effecient exhaust systems. you want the least amount of backpressure, least amount of restriction, and the highest amount of velocity.

    so if your current muffler is restrictive (ie. baffled, chambered, etc.) then removing that component will (in theory) free up a few ponies. But it may be negligable if the system is already very efficient. Meaning the butt dyno will not feel the difference.
     
  8. Sep 18, 2009 at 6:47 PM
    #8
    beastlytaco

    beastlytaco [OP] This is TW. One never knows what is a joke anymore

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    well, yeah i mean i know all about the scavenging and all that, but i was jsut wondering about the negative side effects of dumping the exhaust. like CO emissions coming into the cab of the truck
     
  9. Sep 18, 2009 at 6:54 PM
    #9
    Incognito

    Incognito μολὼν λαβέ

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    OakleyTRD has his dumped, and he hasn't had any negative side effects... :)
     
  10. Sep 18, 2009 at 6:55 PM
    #10
    beastlytaco

    beastlytaco [OP] This is TW. One never knows what is a joke anymore

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    he has a 4 cyl?
     
  11. Sep 18, 2009 at 6:57 PM
    #11
    InfidelTaco

    InfidelTaco No better friend,No worse enemy...

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    No
     
  12. Sep 18, 2009 at 7:05 PM
    #12
    crawl

    crawl Well-Known Member

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    the further back you dump, the less likely it will creap back into the cabin. why not keep what you have?
     
  13. Sep 18, 2009 at 7:06 PM
    #13
    Incognito

    Incognito μολὼν λαβέ

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    OakleyTRD has a V6, but I'm guessing it's the same concept.
     
  14. Sep 18, 2009 at 7:08 PM
    #14
    beastlytaco

    beastlytaco [OP] This is TW. One never knows what is a joke anymore

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    well, my current set up, when i put it on i screwed up the angle that the tip is at. so it hangs down at a 45 degree angle and it scrapes on people driveways sometimes. i cant ever haul anything heavy cause i tend to scrape it. I thought about taking it to a shop and having it fixed but i thought this might be anohter cheaper alternative
     
  15. Sep 18, 2009 at 7:10 PM
    #15
    Incognito

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    Yeah, I don't see a problem with cutting it.
     
  16. Sep 18, 2009 at 7:11 PM
    #16
    08pretaco

    08pretaco Almost there

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    as this is true it also looks for what kind of power you are looking for. think of it like this, without a bigger displacement or f/i then you can only push so much air into the cylinder and less back pressure isnt gonna help until you reach high end revs allowing that air to be pushed in there quicker through the cycles. dont do much to the 4 bangers except a header and high flow cat dumped you wont feel much.

    dont dump it before cause then the hot exhaust gases heat up your differential and rear axle.

    again this is only personal experience and nothing proven.

    my old tc i had 2.5" all the way back and no cats or resonators, lost lots low end but high end romped.

    my current setup, dt headers, jardine catback and love the low end power. starts around 2k and you can already feel the torque build up
     
  17. Sep 18, 2009 at 7:17 PM
    #17
    beastlytaco

    beastlytaco [OP] This is TW. One never knows what is a joke anymore

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    well, im gonna be going with DT shoty headers hopefully this year. so, low end power will be there a little bit as well as top end power. but i think that either way, the truck should( hypothetically) be pushing close to 175 horses or so after headers as well as the other things i have done. but mainly i want the truck to look and sound as good as possible without jeopardizing functionality
     
  18. Sep 18, 2009 at 7:31 PM
    #18
    crawl

    crawl Well-Known Member

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    no matter how you say it, backpressure is bad and a less restrictive exhaust will ALWAYS put out more power.
     
  19. Sep 19, 2009 at 6:22 AM
    #19
    sweater914

    sweater914 Well-Known Member

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    You can't have your cake and eat it to. For example if you were to reduce the backpressure by removing a restrictive muffler, the velocity may go up, but now if you increase the size of the pipe from say 2.5 to 3.5 inches the exhaust velocity will go down (unless I just fell off my rocker). You've just increased the volume of the pipe for a given amount of exhaust gas.

    I will agree with the fact the current exhaust systems on many vehicles are much more efficient than past efforts. So most attempts at increasing performance for a normally aspirated engine will not yield huge gains.

    After a little searching I found this article on exhaust and backpressure from a mustange forum. Generally, the article states that backpressure is bad, but on pages 5 and 6 they discuss exhaust pipe size and tuning of the tailpipe.

    http://www.veryuseful.com/mustang/tech/engine/exhaustScavenging.pdf
     
  20. Sep 19, 2009 at 7:41 AM
    #20
    crawl

    crawl Well-Known Member

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    no thanks, I'll stick with what I've learned from exhaust builders.

    what part of this^ are you disagreeing with? or feel its having your cake and eating it too? I never said use the largest pipe size you can stuff under your truck :confused:
     
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