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Will 40 mm wastegate be big enough?

Discussion in 'Newbie and Basic Turbo Tech Forum' started by fst72vette, May 10, 2009.

  1. fst72vette

    Joined:
    Feb 14, 2009
    Just wondering if a 40 mm wastegate would be big enough?

    I have a 355 SBC mild, iron headed, Turbonetics T76 with .96AR housing, 850 C&S blow through.

    Looking to run around 8-10 psi. to start

    Thanks

    Randy

    Or should I just go with a 44mm. There is only like a 1/4" difference between them.
     
    fst72vette, May 10, 2009
    #1

  2. lazaris

    Joined:
    Jul 2, 2008
    I would go with the bigger one if thats what you have.
     
    lazaris, May 10, 2009
    #2

  3. fst72vette

    Joined:
    Feb 14, 2009
    I dont have either one yet. A friend of mine has a 40mm that he wants to give to me for next to nothing. I was wondering what the min amount of boost I would be able to make with it??? :huh:
     
    fst72vette, May 11, 2009
    #3

  4. jaredsamurai

    Joined:
    Jul 24, 2007
    Depending on how its positioned with regard to exh flow i bet it would work. I'm runnin an old tial 35mm as low as 5psi with a 302 with aluminum heads and intake. Just don't put it on the crossover pipe. that prob won't work
     
    jaredsamurai, May 11, 2009
    #4

  5. furchaser

    Joined:
    Sep 15, 2007
    Out side of the radius feeding the turbo and you will getaway with it. For a little while. :angel:
     
    furchaser, May 11, 2009
    #5

  6. fst72vette

    Joined:
    Feb 14, 2009
    ahhhh... I guess I ll just do it right and get a bigger one. Thanks guys!
     
    fst72vette, May 13, 2009
    #6

  7. LowMount

    Joined:
    Aug 12, 2007
    I think a 40mm would be fine but it also matters where its placed. If its placed on the crossover, you generally need to go bigger than at the merge.
     
    LowMount, May 13, 2009
    #7
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