why turbos?
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Junior User
Joined: Aug 2012
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From: Kingsville, TX
why turbos?
Iv been wondering for a while the link if any between turbos and fuel economy. I'm seeing more and more newer stock cars with turbos installed typically with smaller sized engines. I would assume that the so called "good" fuel economy comes from the small size of the engine, but could the turbo actually increase the mpg of your truck making it burn better? your thoughts are appreciated. 
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Joined: Apr 2004
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The turbo may help fuel economy on some diesel engines. Air/fuel wise, diesel is another world from gas.
On a gas, it's a power adder. The economy comes from the smaller motor being able to carry the load most of the time with little or no boost. Keep your foot in it and it will swill fuel with the best of them.
Adding a turbo to an older motor or even a newer non-turbo motor will not produce better fuel economy.
If you push more air into a gas motor, you need more fuel.
Check the "observed" fuel economy in the Ecoboost vs V6 Mustang.
2015 Ford Mustang V6 vs Ford Mustang EcoBoost - AutoGuide.com News
The EPA numbers make a big promise, but the EPA test doesn't make the turbo do much work. In the real world, if you call up 300 horses, you have to feed them regardless of how they arrive.
On a gas, it's a power adder. The economy comes from the smaller motor being able to carry the load most of the time with little or no boost. Keep your foot in it and it will swill fuel with the best of them.
Adding a turbo to an older motor or even a newer non-turbo motor will not produce better fuel economy.
If you push more air into a gas motor, you need more fuel.
Check the "observed" fuel economy in the Ecoboost vs V6 Mustang.
2015 Ford Mustang V6 vs Ford Mustang EcoBoost - AutoGuide.com News
The EPA numbers make a big promise, but the EPA test doesn't make the turbo do much work. In the real world, if you call up 300 horses, you have to feed them regardless of how they arrive.
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It would be heavier, have more torque and probably less HP. I would be slower by a significant amount. In a car like that, it could get 40+ mpg highway.
Check the specs on a 2.8 Duramax diesel for a ball park idea.
Check the specs on a 2.8 Duramax diesel for a ball park idea.
FTE Legend
Joined: Jun 2006
Posts: 31,930
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From: Ottawa, Ontario
Ford should have tried a little harder to explain to the public about forced induction, the fact is you can only have one or the other(Eco or Boost) at any given time, when you're using more HP you're also using more fuel.. no way around it. The decal should be Eco/Boost.
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Joined: Nov 2011
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From my research, with old school turbos you're expected to lose 10% fuel economy average. I just boosted my old ford 300 and I'm not expecting good mileage whatsoever. There's always going to be that backpressure on the hot side.
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