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minimum amount of straight pipe before and after MAF

Discussion in 'Turbo Tech Questions' started by detonator, Mar 11, 2004.

  1. detonator

    Joined:
    Jan 11, 2004
    putting together a junkyard twin setup. getting close to run time. I ordered a pro-m 75mm universal but its not here yet. i am working on the cold side piping this weekend. i would like to know the minimum amount of straight pipe before and after MAF for optimum performance Thanks for any input Mike
     
    detonator, Mar 11, 2004
    #1

  2. Turbostangman

    Joined:
    Jan 30, 2003
    Sell it and buy a Univer.....
     
    Turbostangman, Mar 11, 2004
    #2

  3. 034v

    Joined:
    Feb 23, 2003
    I have noticed that in order for the Bullet to work well on a blow-thru set up, you must lean out the MAF curve a bit.. If you can get the tune on the curve right, then you should have at least 5 inches on either side of straight pipe.. My Bullet works great, I also welded the mount holes so no boost will get out..
     
    034v, Mar 12, 2004
    #3

  4. GT_4_FUN

    Joined:
    Nov 10, 2003
    I talked with PRO-M about a week ago about this same issue. I have a 75mm Bullet that I am using on my turbo system. I was concerned about a 90 degree bend that I have right after the MAF (my set up is a draw through). I have a filter on the inlet side of the MAF. PRO-M told me that the only problems occur is when there is a sharp bend in front of the MAF not afterwards. He told me that it would be a waste of $$ to upgrade my MAF. So I had it recal'd for 42#.

    I hope this helps.
    Craig
     
    GT_4_FUN, Mar 12, 2004
    #4

  5. shawnt64

    Joined:
    Jun 10, 2003
    that a relief! have the same setup
     
    shawnt64, Mar 12, 2004
    #5

  6. Turbostangman

    Joined:
    Jan 30, 2003
    I am not sure who you spoke with but this is not entirely true. I had about 12" of straight before my Bullet and when I went to a Univer I picked up 2-3MPH traps.

    One of my friends gained 16RWHP by switching from a Bullet to a univer.

    They didn't build the univer for no reason.
     
    Turbostangman, Mar 12, 2004
    #6

  7. shawnt64

    Joined:
    Jun 10, 2003
    will a dyno tune/ chip burn compensate for the pro m and its rich condition or will they have to recalibrate
     
    shawnt64, Mar 12, 2004
    #7

  8. Turbostangman

    Joined:
    Jan 30, 2003
    A recalibration with the piping you plan on using is a must but the problem is when a certain air volume is reached the MAF readings begin to fluctuate and throws off the A/F ratio.
     
    Turbostangman, Mar 12, 2004
    #8

  9. shawnt64

    Joined:
    Jun 10, 2003
    is a wide band sensitive enough to show the fluctuations.
     
    shawnt64, Mar 12, 2004
    #9

  10. Turbostangman

    Joined:
    Jan 30, 2003
    Should be but a logger of the MAF output signal should show it also if it occurs.
     
    Turbostangman, Mar 12, 2004
    #10

  11. detonator

    Joined:
    Jan 11, 2004
    sorry i confused you guys..i made that post after a few beers...i do have a 3 inch pro flow universal..i dont know where i came up with the 75 mm thing..oops so will my answer be different now? thanks ill be more carefull next time Mike
     
    detonator, Mar 12, 2004
    #11

  12. SlowJoe

    Joined:
    Jul 31, 2003
    WHERE DO YOU guys buy your universal at.
     
    SlowJoe, Mar 12, 2004
    #12

  13. Toma

    Joined:
    Dec 12, 2003
    3-4 pipe diamters for length before, 2 pipe diameter for length after....
     
    Toma, Mar 12, 2004
    #13

  14. Turbostangman

    Joined:
    Jan 30, 2003
    Then it doesn't matter.

    Way to go on a wise purchase. :tu:
     
    Turbostangman, Mar 12, 2004
    #14
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