Turbo Drawing

Discussion in 'Performance' started by cobalt123, May 3, 2011.

  1. cobalt123

    cobalt123 Platinum Member

    Age:
    31
    Posts:
    15,202
    Likes Received:
    4
    Joined:
    Jul 18, 2009
    Location:
    Tyler Texas
    .http://www.ztechz.net/id1.html

    [​IMG]

    [​IMG]

    [​IMG]

    [​IMG]'

    [​IMG]

    [​IMG]

    [​IMG]

    ---------- Post added at 01:26 AM ---------- Previous post was at 01:21 AM ----------

    these are just an example of some parts needed to turbocharge your vehicle they also give a good idea as to what is happening to the engine under forced induction. note that these are generic parts not GM specific


    NOw for some GM specifics The SS/TC borg werner twin scroll k04 turbo

    [​IMG]

    Using (P1 + P2) / P2 = Pressure Ratio
    P1 = Desired boost pressure in psi
    P2 = ambient atmospheric pressure (14.7psi)

    Our engines are almost 122 CID, so at 100% VE our engines should flow close to 220 CFM. Assuming 80% VE this means approx 176 CFM at 6,250 RPM, which is approx 12 lbs/min at that rpm

    Quick calculations (it takes several calculations to calculate a single data point on that map) show our 260hp to be at about the 0.12 mark on the X axis. I believe the X axis is Kg/s, so you can convert to lb/min if you want to by multiplying the numbers by 7. (7 is not the exact number to convert, but it will get you very very close and is easy to remember)

    This also assumes many variables that are not listed here such as air temperature, altitude (assuming 14.7 psia for sea level), etc. The chart shows the calculation used to achieve nredV using 183.5, which means they are using 83.5% VE for their calculations.

    Using assumed variables, and assuming that this chart is the correct one (lots of assumption there), that would seem to indicate that at the very outside edge of the efficiency island is around 22 psig before the compressor will surge - this lines up with both the overboost protection in the computer and what some tuners have run into already. 21 is about the max safe boost level on the stock K04 (which is what Hahn's tuner sets the boost to, so this lines up as well)

    All this is now public info.
    http://media.gm.com/us/powertrain/en/product_services/2008/08car.htm

    Engine power curve:
    http://media.gm.com/us/powertrain/e...ry/Ecotec/2008 LNF/2008_20L_LNF_Cobalt SS.pdf

    Engine Spec Sheet:
    http://media.gm.com/us/powertrain/en/product_services/2008/Spec Sheet/Ecotec/08_LNF.xls

    Engine Information:
    http://media.gm.com/us/powertrain/en/product_services/2008/Whats New/Ecotec/08_LNF.doc

    Trans Spec Sheet:
    http://media.gm.com/us/powertrain/e...eet/Transmissions/2008 Manuals/08_GME_MU3.xls

    Transmission Info:
    http://media.gm.com/us/powertrain/e...smissions/2008 Manual Transmission/08_MU3.doc[
     
    Last edited: May 3, 2011
  2. 06CobaltLS

    06CobaltLS Full Access Member

    Posts:
    1,862
    Likes Received:
    0
    Joined:
    Feb 13, 2011
    Location:
    JC, MO
    god did you create these?
     
  3. Tuner923

    Tuner923 Full Access Member

    Posts:
    4,466
    Likes Received:
    0
    Joined:
    Jul 20, 2009
    Location:
    Norristown, PA
    yep looks like a turbo. I just rebuilt a turbo on a Cummins ISC, variable geometry turbo.. was fun. still spewing oil into the exhaust so I now have to tear off the head and more than likely replace the sleeves and pistons :p
     
    Last edited: May 4, 2011
  4. cobalt123

    cobalt123 Platinum Member

    Age:
    31
    Posts:
    15,202
    Likes Received:
    4
    Joined:
    Jul 18, 2009
    Location:
    Tyler Texas
    Sounds like fun
     

Share This Page