Consumer Reports: Small Turbo Engines Don't Meet Efficiency Claims
February 5, 2013 9:29 AM
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Not all small turbo engines are more fuel-efficient says Consumer Reports
isn't letting up on its testing of fuel efficiency claims for various vehicles. According to the publication, small turbocharged engines aren't delivering on the fuel efficiency claims by the manufacturers.
Small displacement turbocharged engines have become common in a variety of vehicles in place of larger displacement, naturally aspirated engines. The claim by the automotive manufacturers is that the small displacement turbocharged engines offer the same power as larger displacement engines and improved fuel efficiency.
however, states that in its real world testing many vehicles with turbocharged engines aren't as efficient as the manufacturers claim. The publication recently tested the
1.6-liter EcoBoost in a Ford Fusion
and found that the turbocharged version has a slower 0-to-60 mph time than its competitors and achieved only 25 mpg in testing, making it among the worst for fuel efficiency in the recent crop of family sedans.
The publication also claims that the larger 2.0-liter turbocharged four-cylinder, which promises the power of the V-6 with the fuel economy of four-cylinder engine, fails to deliver on either front.
2013 Ford Fusion
Chevrolet is also under fire for the 1.4-liter turbo four-cylinder in the Cruze.
claims that real world performance wasn’t much better than the standard, naturally aspirated 1.8-liter engine and overall fuel economy was similar as well.
Ford and General Motors representatives offered similar statements explaining the discrepancy. "When you have an EcoBoost engine, you have the opportunity to have performance and fuel economy, but not at the same time,” said Ford Powertrain Communications Manager Richard Truett. “EcoBoost adds a dimension that you won't get by just making the engine smaller. We're telling the driver, it's up to you on how you want to drive."
"The Cruze turbocharged engine provides a much broader torque curve than a non-turbocharged engine, and that means better acceleration across the rpm range, making for a more fun-to-drive car,” said GM spokesman Tom Read. “However, if you have a heavy foot on a turbocharged engine, you're not necessarily going to see a lot of fuel economy benefits."
The EPA is going to
and other owners have complained that fuel efficiency doesn't meet the automakers claims in the Fusion Hybrid and C-MAX.
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RE: Isn't this what I've been saying?
2/6/2013 10:08:26 AM
What does regenerative braking have to do with turbos?
Sure, turbos do allow the engine to produce more lower end torque but only when under boost. When they're under boost though they aren't any more efficient than an NA car sucking down gas. More often that not they're worse. It doesn't give you an lower average rpm either. Also a lower avg rpm doesn't always mean more efficient, nor is avg rpm an indicator of anything by itself..
RE: Isn't this what I've been saying?
2/6/2013 3:48:10 PM
The trend toward regenerative braking and less friction is reducing the relative advantages of smaller engines.
High rpm operation loses significant amounts of power to frictional losses and fluid turbulence. To test this, put your car in a lower gear and watch your mpg drop like a rock. A high revving normally aspirated engine can produce the power of a similar sized low revving turbocharged engine, but at much reduced efficiency. Manufacturers have gone to a whole lot of trouble (warranty nightmares) to use turbochargers because of CAFE standards.
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