As counterintuitive as it sounds, EGR actually has a cooling effect on the intake charge:
"EGR has been successful in reducing NOx in gasoline engines. When an engine uses EGR, a percentage of the exhaust gases are drawn or forced back into the intake, at the direction of the engine's electronic control module (ECM), and mixed with the fresh air and fuel the engine is ingesting.
"The purpose of using EGR is to lower the peak flame temperatures inside the combustion chamber. Forcing some exhaust back into the cylinder slightly reduces the concentration of oxygen and slows the burning a bit, making things a little cooler. EGR also absorbs heat, further cooling the process."
So eliminating your EGR will probably increase combustion temperatures within the cylinders. But it may come at a price, as your engine may actually run hotter...and any tiny MPG increases MAY be offset by evaporative losses. Or they may not.
The two largest factors on MPG are vehicle weight--which you may not be able to affect significantly--and final gear ratio. If you already have a 700R4 overdrive automatic [0.8:1 overdrive ratio] and a differential gearset lower than 3.30:1, you may have already seen all the MPG you're gonna get from a vehicle that weighs what a Suburban does.
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Today's Featured Article - Bad Vibes - by Curtis Von Fange. One of the strangest ways to communicate with our tractor is to ask it how it feels. "Ask it how it feels," you say? Yup, ask it how it feels. Now, as with the other articles in this series one has to be able to hear what 'ole blue' is trying to say in response. The nice thing about our old iron friends is that they are usually quite consistent in their response, rather unlike some people I know who might change what they say due to the weather or other mitigating circumstances. But since t
... [Read Article]
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