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Tail pipes. are they holding me back.

Discussion in 'Turbo Tech Questions' started by bk_cauley, Dec 5, 2010.

  1. bk_cauley

    Joined:
    Jan 6, 2008
    right now i have a 3" DP and it splits into two 2 ¼ factory fox tail pipes and after i got it all back together the car is so much quieter. i have a single 3" race bullet in line. but for whatever reason the car seems to be a little slower now. expecially on the top end. are they really hurting me or am i making a mountain out of a mole hill. If they are i debating on stepping up to the flow master 3" tails. would those also be a restriction? i wouldnt think so but im not sure.
     
    bk_cauley, Dec 5, 2010
    #1

  2. Andy Dorsett

    Joined:
    Jun 23, 2003
    What power?
     
    Andy Dorsett, Dec 5, 2010
    #2

  3. bk_cauley

    Joined:
    Jan 6, 2008
    never had it dynoed. Tuner sold his dyno and we street tunded it. stock bottom end, stock cam, ported TW heads (325 I, 295 E @ .050 not 100% sure but close) typhoon intake and a 70mm turbo. through a t5 and 3:27 gear
     
    bk_cauley, Dec 5, 2010
    #3

  4. 68mustang

    Joined:
    Jan 31, 2010
    i ran an 11.2 @124mph with 2 1/4 tailpipes that shouldnt be your problem, maybe just needs a tune up? new plugs, etc
     
    68mustang, Dec 5, 2010
    #4

  5. bk_cauley

    Joined:
    Jan 6, 2008
    the entire combo is only a month or two old. it just feels weird for some reason when i added the pipes.
     
    bk_cauley, Dec 5, 2010
    #5

  6. turbocoronet

    Joined:
    Sep 16, 2009
    I tested my back pressure with and without 2 1/4" tailpipes and there was a 4.5 psi diff. My system is a mild 440 with a single 80 mm t4 frame 3 1/2" down pipe split into my old 3" duals with ultraflows then two 3" electric dumps before the rearend then the two 2 1/2" tailpipes. Running 10 lbs boost there was zero back pressure after the turbine with the cutouts open. 4.5 lbs back pressure and noticeably less power with cutouts closed.
    I put the small tailpipes on to quiet down the old high compression 500 stroker.
     
    turbocoronet, Dec 5, 2010
    #6

  7. bk_cauley

    Joined:
    Jan 6, 2008
    Do you reckon the flow master tail pipes will help out. they are true 3" all the way.
     
    bk_cauley, Dec 6, 2010
    #7

  8. john01374

    Joined:
    Jun 22, 2006
    ...
     
    john01374, Dec 6, 2010
    #8

  9. 68mustang

    Joined:
    Jan 31, 2010
    no, i agree that tailpipes will cause some restriction and some power, but how fast do you really want to go vs. how do you want the car to sound. are you really trying to get every last tenth out of the car?
     
    68mustang, Dec 13, 2010
    #9

  10. bk_cauley

    Joined:
    Jan 6, 2008
    No im no trying to get everything out of it. and ive made my mind up when $ permits im going to switch over to the 3" tails.
     
    bk_cauley, Dec 13, 2010
    #10

  11. 10secgoal

    Joined:
    Jan 29, 2005
    Best of both, cut outs ?
     
    10secgoal, Dec 13, 2010
    #11

  12. bk_cauley

    Joined:
    Jan 6, 2008
    Thats the plan. im probably going to get an electric one. i have a bolt on now and thats a pain in the ass.
     
    bk_cauley, Dec 14, 2010
    #12

  13. 68mustang

    Joined:
    Jan 31, 2010
    talk about $$$ electric cutouts are pricey little buggers
     
    68mustang, Dec 14, 2010
    #13

  14. 10secgoal

    Joined:
    Jan 29, 2005
    But banging the turbo at a light with them open is priceless !!
     
    10secgoal, Dec 14, 2010
    #14

  15. 68mustang

    Joined:
    Jan 31, 2010
    HAHA yea probably worth it, if I had the money theyd be on there
     
    68mustang, Dec 14, 2010
    #15

  16. bk_cauley

    Joined:
    Jan 6, 2008
    i would rather spend it than lay on my back in some random parking lot.
     
    bk_cauley, Dec 14, 2010
    #16
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