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I'm out of this one.

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Maybe your blood pressure will go down some then! Geez, it's just a web board with a question...

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OK?

Now what?

OK, if we're gong to play THAT game:

Cause and effect....
I put a turbo on my truck.

I didn't change the programming in the PCM for a turbo, so when I'm not in boost it doesn't know it has a turbo on it.

I get better fuel mileage now.

That's cause and effect.

Yeah, I already told you guys WHY, but apparently it was supposed to COST me fuel mileage and it didn't. I don't believe the efficiency changed one single bit when I'm not in boost.

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you already said it was cuz you started [Edited by Moparts - Family Friendly Site - Keep it clean] footing the truck vs how you drove it b4. That's a different argument that states changing your driving characteristics can actually effect mpg. Anyone going to argue that one and say that there's less pumping losses at WOT so you should get better mpg by hammering on it?

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I guess the First law of thermodynmics does not apply to turbos. I always thought heat/energy sent out the exhaust was wasted and deducted from the total efficency of the engine. I also thought using that wasted exhaust heat and energy to spin a turbo was beneficial to improving cylinder filling. I also thought it if it took x amount of gallons of fuel to move a car y amount of miles and z amount of heat went out the exhaust, by lowering z I could go Y+ miles or use x less gallons.

Guess I was wrong.

http://en.wikipedia.org/wiki/First_law_of_thermodynamics

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a turbocharged IC gas engine is still making vacuum and not seeing any boost or associated benefits.

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And is that because the turbo is oversized for power instead of economy by choice?

I'll reread the first page.

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I guess the First law of thermodynmics does not apply to turbos. I always thought heat/energy sent out the exhaust was wasted and deducted from the total efficency of the engine. I also thought using that wasted exhaust heat and energy to spin a turbo was beneficial to improving cylinder filling. I also thought it if it took x amount of gallons of fuel to move a car y amount of miles and z amount of heat went out the exhaust, by lowering z I could go Y+ miles or use x less gallons.

Guess I was wrong.

http://en.wikipedia.org/wiki/First_law_of_thermodynamics

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That's not necessarily wrong, but, again, fails to account for the fact that while traveling at low-load highway speeds, a turbocharged IC gas engine is still making vacuum and not seeing any boost or associated benefits. So, the heat passing through the turbo and out the exhaust is still "wasted".

Pretty sure that was covered on the first page though.

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