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EGT question

This is a discussion on EGT question within the Forced Induction forums, part of the LSx Technical Help Section category; I have a 05 GMC Sierra 6.0L (LQ$) with a STS turbo kit on it. When pulling a large load ...

  1. #1
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    EGT question

    I have a 05 GMC Sierra 6.0L (LQ$) with a STS turbo kit on it. When pulling a large load uphill I will see EGT in the 1500 F range. Is this to high?

    While pulling other data is: mixture is in the 11.0:1 range ( data from wideband O2), and my predator tuner is not showing any knock.

    Thanks

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    Thanks for the info. I thought that that was a little high for the stock internals to handle.

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    Member cailey37's Avatar
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    1998 Pontiac Trans Am

    I just pulled this off the STS instruction manual.....

    STS Towing Warning
    The STS™ Turbo System is NOT recommended for towing and/or heavy hauling. The Turbocharger will
    produce more than adequate power and torque for towing. However, turbocharged stock engines, combined
    with the heavy loading of the engine and extended boost conditions during towing, can produce the following
    potentially damaging conditions:
    Extreme exhaust gas temperatures (in excess of 1500F) can damage Catalytic Converters, Valves, and Stock
    Pistons.
    High air intake temperatures (in excess of 200F) can raise combustion temperatures which may cause
    detonation.
    Extended high RPM driving can cause lean fuel mixtures (in excess of 12:1) resulting in high combustion and
    exhaust gas temperatures which may cause detonation.
    Heavy loads will produce full boost at very light throttle conditions which may cause lean fuel mixtures (at light
    throttle positions the PCM is running in Closed Loop which maintains 14.7:1 air fuel ratios).
    High combustion temperatures can develop more heat than the stock spark plugs can dissipate (stock spark
    plug heat range is too hot) which can cause spark plug damage and detonation.
    Heavy loading and high exhaust temperatures can cause “Boost Creep” and an “Over-Boost” condition which
    may cause severe engine damage.
    High torque combined with heavy loads can cause extreme transmission temperatures which can damage
    transmission and/or drive-train components.
    Extended driving periods of high horsepower production can create more combustion heat than the stock cooling
    system (radiator) can control which may cause engine overheating and severe engine damage.
    WARNING: USE CAUTION AND GOOD JUDGEMENT AND TOW AT YOUR OWN RISK! DO NOT LET THE
    ENGINE DETONATE DURING BOOST! ANY AUDIBLE DETONATION (PINGING) WILL DAMAGE YOUR
    ENGINE!

  4. #4
    Member Rich L's Avatar
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    Burgandy
    2002 Z28

    Quote Originally Posted by 5kcstq View Post
    I have a 05 GMC Sierra 6.0L (LQ$) with a STS turbo kit on it. When pulling a large load uphill I will see EGT in the 1500 F range. Is this to high?

    While pulling other data is: mixture is in the 11.0:1 range ( data from wideband O2), and my predator tuner is not showing any knock.

    Thanks
    1500 is too high for safey.

    You want your exhuast temps to be closer 1450 or 1500 max.

    Your better off getting a methanol or alcholhol injection kit to dramatically reduce exhuast temps and potential detonation. Or go with very high octane race fuel... that destorys cats and o2 sensors.
    2002 A4 Z28: SLP LM exhaust and HSW 100whp dry shot.

    NA: 323.4WHP@5360 RPMs, 344.2ft-lbs@4610 RPMs,
    N2O: 417.0WHP@5200 RPMs, 467.6ft-lbs@4210RPMs

    NA: 13.351@107.48mph, N2O: 12.324@117.88


    http://www.youtube.com/watch?v=JMHmdFywR0w

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