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$) with a STS turbo kit on it. When pulling a large load ...
06-06-2007, 06:43 AM #1
- Join Date
- Sep 2006
I have a 05 GMC Sierra 6.0L (LQ$) 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.
06-12-2007, 07:24 AM #2
- Join Date
- Sep 2006
Thanks for the info. I thought that that was a little high for the stock internals to handle.
06-12-2007, 11:41 AM #3
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
High air intake temperatures (in excess of 200F) can raise combustion temperatures which may cause
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
06-13-2007, 09:55 AM #4
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: firstname.lastname@example.org, N2O: email@example.com
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