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Old 12-20-2012, 03:32 PM   #1
adaseb
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If turbos give better fuel economy why don't all econobox have them

I see that in the last few years Bmw is turbocharging a lot of their engines and one reason is fuel economy.

Why doesn't econobox come with 40hp engine and just turbo charge those. ?
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Old 12-20-2012, 03:34 PM   #2
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Likely due to the increase in cost, hence making them less "ECONO"box.
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Old 12-20-2012, 03:34 PM   #3
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Because It wouldnt save you fuel on a 40 hp Engine, A turbo atomizes the air to help it burn better. Larger engines tend to be less efficent thus why they make a difference is my understanding
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Old 12-20-2012, 03:40 PM   #4
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Because It wouldnt save you fuel on a 40 hp Engine, A turbo atomizes the air to help it burn better. Larger engines tend to be less efficent thus why they make a difference is my understanding
False.

Turbos compress air so that more air can be forced into the combustion chamber. More air = more fuel can be burnt = more power.

Small displacement turbo engines are just coming into the market. Expect to see many more as time goes on.

The biggest reason they haven't been widely available is due to both cost and the small engine itself. Smaller displacement engines have less exhaust flow and that doesn't bode well for turbos as they use the exhaust stream (turbine side) to power the compressor side.

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Old 12-20-2012, 03:59 PM   #5
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Because It wouldnt save you fuel on a 40 hp Engine, A turbo atomizes the air to help it burn better. Larger engines tend to be less efficent thus why they make a difference is my understanding
lol wat.

A turbo COMPRESSES the air, effectively increasing the displacement of an engine. The difference is a turbo is power on demand, so a small engine is still a small engine until more power is needed, whereas a larger displacement engine is going to continue to use more air and fuel that may be necessary to maintain its own momentum.
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Old 12-20-2012, 06:43 PM   #6
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lol wat.

A turbo COMPRESSES the air, effectively increasing the displacement of an engine. The difference is a turbo is power on demand, so a small engine is still a small engine until more power is needed, whereas a larger displacement engine is going to continue to use more air and fuel that may be necessary to maintain its own momentum.
I know how a turbo/ supercharger work.... Im talking about when the Engine isnt Under boost, A turbo isnt Power on demand, Having a supercharger is on demand
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Old 12-20-2012, 07:12 PM   #7
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I know how a turbo/ supercharger work.... Im talking about when the Engine isnt Under boost, A turbo isnt Power on demand, Having a supercharger is on demand
Um...yes...it is and no...you clearly don't.
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Old 12-20-2012, 07:13 PM   #8
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Um...yes...it is and no...you clearly don't.
Your an idiot. Have you even driven a trubo charged car? Ever heard of turbo lag? A super charged car has no lag, Motor spins the belt car its more power instantly. A turbo waits for exhaust gasses to spin it up and takes time to do so.
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Old 12-20-2012, 07:24 PM   #9
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I know how a turbo/ supercharger work.... Im talking about when the Engine isnt Under boost, A turbo isnt Power on demand, Having a supercharger is on demand
I think the issue here is that we all would like to know what "atomizing air" means.
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Old 12-20-2012, 07:47 PM   #10
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I think the issue here is that we all would like to know what "atomizing air" means.
this.
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Old 12-20-2012, 09:38 PM   #11
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I think the issue here is that we all would like to know what "atomizing air" means.
It means he's seen too many ads for the Turbonator. They swirl the air for better atomization!!!

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Old 12-20-2012, 04:06 PM   #12
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Economy cars are meant to be economical to buy and run. If you want the best fuel economy, spend more money for a hybrid or electric car.

Turbos also don't give you better fuel economy. They just push more air into the engine.



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Because It wouldnt save you fuel on a 40 hp Engine, A turbo atomizes the air to help it burn better. Larger engines tend to be less efficent thus why they make a difference is my understanding
That is possibly one of the dumbest things I've read on E46Fanatics in a while.
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Old 12-20-2012, 04:13 PM   #13
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Economy cars are meant to be economical to buy and run. If you want the best fuel economy, spend more money for a hybrid or electric car.

Turbos also don't give you better fuel economy. They just push more air into the engine.




That is possibly one of the dumbest things I've read on E46Fanatics in a while.
And there's beeen alot of dumb things said on E46Fanatics.
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Old 12-20-2012, 04:14 PM   #14
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Turbos also don't give you better fuel economy. They just push more air into the engine.
Yes, but the small engine allows you to get better fuel economy when the turbo is not feeding boost and provides power, even with a small engine, when feeding boost. Best of both worlds.

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That is possibly one of the dumbest things I've read on E46Fanatics in a while.
+1
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Old 12-20-2012, 04:26 PM   #15
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In before everyone is an engineer all of a sudden.
I'm an engineer...but engineers don't tend to speak on a subject unless they truly understand it and can present the material logically.
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Old 12-20-2012, 04:42 PM   #16
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I'm an engineer...but engineers don't tend to speak on a subject unless they truly understand it and can present the material logically.
Unless that subject happens to be gun control, apparently.









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Old 12-20-2012, 04:30 PM   #17
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And there's beeen alot of dumb things said on E46Fanatics.



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Yes, but the small engine allows you to get better fuel economy when the turbo is not feeding boost and provides power, even with a small engine, when feeding boost. Best of both worlds.
I agree, but OP didn't mention a smaller engine.
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Old 12-20-2012, 04:25 PM   #18
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Economy cars are meant to be economical to buy and run. If you want the best fuel economy, spend more money for a hybrid or electric car.

Turbos also don't give you better fuel economy. They just push more air into the engine.




That is possibly one of the dumbest things I've read on E46Fanatics in a while.
False. It is this administrations (Bush too) moronic push for clean energy (which is actually filthy) that kept diesels off our shores as mainstream vehicles. Diesels have been getting 50+ MPG since the 80s, and the current crop of econo diesels are breaking the 75mpg mark.

http://www.whatgas.com/fuel/diesel-mpg.html

They are also CHEAPER. Diesel in the US is expensive, and cars like TDI Audis cost MORE than their gas counterparts....in Europe, the diesel models are not only more economical, but they cost less....and are more reliable. A diesel motor for the average driver is a godsend, since they suffer less mechanical problems and can run to 100-200K without much sweat.
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Old 12-20-2012, 04:42 PM   #19
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False. It is this administrations (Bush too) moronic push for clean energy (which is actually filthy) that kept diesels off our shores as mainstream vehicles. Diesels have been getting 50+ MPG since the 80s, and the current crop of econo diesels are breaking the 75mpg mark.

http://www.whatgas.com/fuel/diesel-mpg.html

They are also CHEAPER. Diesel in the US is expensive, and cars like TDI Audis cost MORE than their gas counterparts....in Europe, the diesel models are not only more economical, but they cost less....and are more reliable. A diesel motor for the average driver is a godsend, since they suffer less mechanical problems and can run to 100-200K without much sweat.
Umm, what's false? I should have included diesels, but that doesn't make anything false.

Your statements about diesel costs are incorrect though. Diesel engines don't make as much power as similar sized gasoline engines, so they need to compensate for that, as well as they need stronger (more expensive) components to deal with increased cylinder pressures, and lastly clean diesel injection and exhaust treatment systems are very new and very expensive.
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Old 12-20-2012, 05:22 PM   #20
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Economy cars are meant to be economical to buy and run. If you want the best fuel economy, spend more money for a hybrid or electric car.

Turbos also don't give you better fuel economy. They just push more air into the engine.




That is possibly one of the dumbest things I've read on E46Fanatics in a while.
even dumber than when he said he trailers his 330 1000's of miles to go autox'ing.
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