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Thread: Garrett G25 series- anyone used them?

  1. #1
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    Garrett G25 series- anyone used them?

    Looking for some real world results to confirm the power claims by Garrett.

    Looking to use 2x G25-660 with 0.92AR on a twin turbo V8 for 1000whp.

    Thanks


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  2. #2
    aka SpaZdA (tm) mondo2000's Avatar
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    No experience, but damn they look good (for small engines).

    The compressor maps indicate their power potential, you still need to work out how much flow you will need and at what PR.

  3. #3
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    Thought as much.

    Yeah I am interested as they are physically small due to packaging of factory turbos in this car.

    If it helps engine details are:

    4200cc
    Quad cam
    40 Valve
    10:1
    7500rpm

    Will be running E85 so I think they will make the power at high boost however ~2-2.5bar


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  4. #4
    aka SpaZdA (tm) mondo2000's Avatar
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    A 2.1 litre bank of cylinders with 90% volumetric efficiency, running 22 psi of boost (pressure ratio of 2.5), at 7500 rpm will need about 44 lb/min of air. That's pretty much bang in the middle of the compressor map at 78% efficiency and I think it could make about 600hp.

    The surge line at 1 bar of boost is at about 13 lb/min of flow, which works out to be about 2800rpm. In other words if it hits 14.7 psi of boost at 2800 rpm or less it will surge.

    I think it's a pretty good match.

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