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Shimming wastegate spring???

Discussion in 'Turbo Tech Questions' started by BobSnake, Oct 7, 2009.

  1. BobSnake

    Joined:
    Jul 7, 2009
    I'm looking to build more boost off of the wastegate...I don't really want to buy a new one and I'm not sure what the brand is of the one I have now. I do know its fairly large, but only has a 6lb spring in it. Will shimming it increase the boost much or what are my options? This is for an 03 cobra with a 76mm turbo. Thanks!
     
    BobSnake, Oct 7, 2009
    #1

  2. stangman9897

    Joined:
    Mar 23, 2009
    Go to a bigger spring like a 9 or 12. With the shim you will not know what it's going to be at as for as spring rate.
     
    stangman9897, Oct 7, 2009
    #2

  3. domn8rx

    Joined:
    Mar 1, 2006
    We had a 38mm turbonetics gate that came with 5 shims and with all the shims in it only raised 2psi. Just get another spring

    john
     
    domn8rx, Oct 7, 2009
    #3

  4. MONTEGOD7SS

    Joined:
    Jul 29, 2009
    I bet if you post a good pic of it SOMEBODY on here will know what it is. Folks on here run everything from race parts to eBay shit, and everything in between.
     
    MONTEGOD7SS, Oct 8, 2009
    #4

  5. 10secgoal

    Joined:
    Jan 29, 2005
    Sounds like a Hellion kit to me.
     
    10secgoal, Oct 8, 2009
    #5

  6. 302tt

    Joined:
    Aug 4, 2004
    B2 = B1 * (Lf - Lc + S) / (Lf - Lc)

    Where

    B1 = Baseline boost level (no shim)
    Lf = Free length of the spring
    Lc = Compressed length of the spring in the WG (wg is closed, no boost)
    S = Shim thickness
    B2 = New Boost level with shim

    e.g.

    B1 = 5 psi
    Lf = 100 mm
    Lc = 50 mm
    S = 5 mm
    B2 = B1 * (Lf - Lc + S) / (Lf - Lc)= 5 * (55)/(50) = 5.5 psi

    lol - domn8xr was right, it's not worth shimming.
     
    302tt, Oct 8, 2009
    #6
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