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Downpipe 3.5 vs 3.0 on a 89 mustang single turbo

Discussion in 'Turbo Tech Questions' started by md924541, Aug 24, 2006.

  1. md924541

    Joined:
    May 29, 2006
    I have an 89 mustang with a
    T-61 turbo
    42lb injectors
    stock block with ported e'7's
    small camshaft
    performer rpm intake
    3.55 gears
    stock compiter

    I was wondering if going from a 3 inch to a 3.5 would make a decent difference. It pulls hard but just feels like something is holding back on the top end. let me know if you have any ideas thanks.
     
    md924541, Aug 24, 2006
    #1

  2. Black92GT

    Joined:
    Oct 17, 2005
    well you do have stock heads, what is a small camshaft? u mean stock, if so theres another thing holding u back...do you have a TB, MAF??
     
    Black92GT, Aug 24, 2006
    #2

  3. stanggod

    Joined:
    Mar 4, 2003
    With the 60-1 the 3inch is plenty.
     
    stanggod, Aug 24, 2006
    #3

  4. md924541

    Joined:
    May 29, 2006
    yea the heads are E7's and a small camshaft isnt a stock camshaft- it is the older systamax camshaft but i cant find specs anywhere on it. yea I have a MAF its an 80 and a 70mm TB
     
    md924541, Aug 24, 2006
    #4

  5. cobra0393

    Joined:
    Mar 7, 2006
    What he said. :2thumbs:
     
    cobra0393, Aug 25, 2006
    #5

  6. 4cylTurbo

    Joined:
    Oct 10, 2005
    The t61 is not a 60-1, it flows a solid 5-8lbs/min more than a 60-1. The 60-1 is an oldschool wheel that works but its not even close to how awesome the 61mm compressor is. Your turbo will stop making power around 670, unless you have a shot behind it. Depending which turbine housing you run, I may consider a 3.5"turbo back exhaust just for peace of mind, but it should not be necessary with that turbo.
     
    4cylTurbo, Aug 25, 2006
    #6

  7. stanggod

    Joined:
    Mar 4, 2003
    It's not much bigger. Certainly not big enough to need a 3.5 inch exhaust.
     
    stanggod, Aug 28, 2006
    #7

  8. Olee Poole

    Joined:
    Dec 30, 2004
    What rpm does it feel like it holding back? Also what size is your cross over?
     
    Olee Poole, Aug 28, 2006
    #8
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