Do We Need EVs with Turbo Engines Becoming so Fuel Efficient?
October 17, 2011 1:15 PM
comment(s) - last by
You're doing it wrong.
Turbos are on 75% of new cars sold in Europe
You don't have to be a scientist or an automotive engineer to look at the fuel economy that major automakers are squeezing out of their vehicles with normal combustion engines today and wonder if we really need EVs and hybrids. More than one diesel car in Europe is able to provide fuel economy as good or better than the hybrids people generally think are so fuel thrifty.
The catch is that we rarely see diesel engines in the US inside a car, that will be changing, but the diesel car isn't common today for American drivers. One thing that is becoming very common for fuel efficiency sake is the addition of a turbocharger to allow a smaller displacement engine to produce acceptable power to provide the performance drivers expect.
The turbocharger is something that was often thought of for performance cars like the Grand National Buick in the mid to late 1980's. Today the turbo is used in a number of engines including the very popular EcoBoost line from Ford. Ford's EcoBoost engine inside the
is selling very well and has a towing capacity on par with normal engines with larger displacement. The turbocharger is even more widely used in Europe where
reports that 75% of all new cars come with one.
Craig Balis from Honeywell Turbo Technologies told Reuters in an interview, "The turbocharger is a green technology in the sense that it's helping cut emissions and raise fuel economy. It's a critical component to get more fuel efficiency out of the engine."
"Emissions regulations in Europe, the United States and worldwide are a driving force for cleaner, greener vehicles and that's a great landscape for turbocharging," said Balis. "We're confident about the continued evolution of combustion engines and the growing role turbocharging has."
reports that a diesel engine that has a turbocharger can get 40% more mileage than one without a turbo and a gas engine can go 20% further per liter of fuel than one without a turbo. With the impressive economy that normal engines with turbochargers achieve there are many that wonder if we even need EVs and hybrids.
Pierre Gaudillat, policy officer at the Transport and Environment lobby group in Brussels, was asked if we need EVs from a CO2 point of view. He said, "That's a valid question. The answer is: maybe not. Turbos are a no-brainer for cutting CO2 because the efficiency gains are really quite significant. In the near term, we don't really need and can't count on electric vehicles to deliver the CO2 savings. Maybe not until about 2030 or 2050."
This article is over a month old, voting and posting comments is disabled
RE: Stop spreading misconceptions about Turbos
10/27/2011 8:07:21 PM
Unfortunately, I simply fail to see how real world data supports such a claim. While finding separate vehicles with all other factors being equal is virtually impossible, the data is still quite revealing when looking at many of the current turbo performance vehicles vs NA performance vehicles out there:
Subaru STI: 305hp, 17/23 mileage
Subaru WRX: 265hp, 18/25 mileage
Mitsu Evo: 291hp, 17/22 mileage
Mustang V6: 305hp, 19/31 mileage (auto)
Mustang GT: 412hp, 17/26 mileage (manual)
Camaro V6: 323hp, 19/30 mileage
Camaro SS: 426hp, 16/24 mileage
In all cases, the NA cars with similar HP have significantly better fuel mileage, and the NA cars with significant HP advantages have very similar fuel mileage ratings. In the case of the Camaro, it even has a significant weight disadvantage going against it as well.
When you're comparing underpowered NA 2.0L engines to more powerful smaller displacement turbo engines, then there's compelling data that the turbos have an advantage. But when talking about amply (or even overpowered) large displacement engines, the current real world data clearly gives the fuel mileage to large displacement NA engines. Turbos may be a replacement for displacement in the power department, but that clearly doesn't carry over to fuel economy.
RE: Stop spreading misconceptions about Turbos
10/31/2011 10:32:10 PM
Such a comparison is not really instructive because there are too many other factors. Mainly:
1. The Japanese turbos you specify are all permanent four wheel drive, which impacts on fuel economy. Gearing and things also affect the highway economy in particular, they're not what-so-ever targeted at highway cruising.
2. There's a massive difference between a high-boost turbocharged car like the Evo and the low pressure turbos in most of those 75% of cars sold in Europe (a lot of which are probably even diesels). The Evo idles at 1500rpm. I read that the newer twin-scroll BMWs hold max torque from 1250rpm.
3. Comparing the maximum power outputs can be very inadequate. From first-hand experience, my previous car was a 4.0L inline 6, my current car a 2.5L turbocharged inline 5. The max power and torque figures are almost the same for both cars, but the 2.5L engine feels so much more powerful because that max torque is almost all available from 2000rpm below to 2500rpm above where the other engine hit that peak.
What the turbo gives you is the ability to use a smaller capacity, so you do without having the extra weight of a large engine (both in terms of components in reciprocating motion and just the block, head, etc), the extra friction, the extra pumping loss pumping a larger capacity, etc. Things like cylinder deactivation, direct injection, continuously variable valve lift, etc, are not as good as reducing the capacity and they can be applied to smaller engines anyway. With the turbo, you still have the ability to effectively scale up the engine displacement to get more power as needed. With low pressure turbos there's basically no perceptible lag, and you get the sort of low-end torque and drivability that means you don't need to rev high (which would generate a lot of friction and negate a lot of the benefits of smaller capacity). In terms of economy for petrol engines, it is quite effective at the moment. I don't really see what it has to do with hybrids though, if a turbo would be of benefit to the hybrid's ICE then they should use one, it'd still be less CO2 emissions than the non-hybrid.
If you want to see a better comparison, compare the 1.6L Ecoboost Focus engine to the 2.0L naturally aspirated petrol, both new engines from the same manufacturer in the same car. The 1.6L Ecoboost is noticeably better from a drivability perspective (270Nm torque@1900-5000rpm and 134kw versus 202Nm torque@4450rpm and 125kw@6600rpm). Even with that massive difference (looks like you really need to ring the neck of that 2L), the 1.6L is more economical (139g vs. 154g C02/km). There's also a NA version of the 1.6L to compare to if you wanted.
Make a similar comparison with the engine choices across VW's Golf, and look at their twincharge engines.
It's quite obvious that these low pressure turbos provide very substantial benefits for drivability, and for the economy you can achieve when you're targetting a specific level of performance.
"Death Is Very Likely The Single Best Invention Of Life" -- Steve Jobs
Ford Ups Sales Estimates for EcoBoost F-150
October 16, 2011, 8:07 PM
Latest By Shane McGlaun
Windows Phone Sales Grow, But Market Share Continues to Lag Behind Competition
May 7, 2014, 9:39 AM
MSI Launches GS60 Ghost Pro 3K, GS70 Stealth Pro Gaming Notebooks
May 6, 2014, 12:00 PM
Apple to Launch Major Upgrade to Help Boost Sales Ahead of iPhone 6 Launch
May 6, 2014, 9:44 AM
Vermont Congressman Wants Federal EV Tax Credit Increased to $10,000
May 5, 2014, 8:37 AM
Eithad Airlines Offers the First Three-Room Suite on a Commercial Airliner
May 5, 2014, 8:13 AM
Report: AT&T Eyeing $40B DirecTV Purchase
May 1, 2014, 8:00 AM
Student Gmail Accounts No Longer Scanned for Targeted Ads
April 30, 2014, 10:31 AM
Samsung Galaxy K zoom Smartphone Gets Official, Offers 10x Optical Zoom
April 30, 2014, 9:53 AM
Google Autonomous Vehicles Are Working On Mastering City Street Driving
April 28, 2014, 10:25 AM
Samsung Reports that a Small Number of Galaxy S5 Smartphones Shipped with Broken Cameras
April 28, 2014, 10:00 AM
Ford, Toyota, and Universal Pictures Celebrate "Back to the Future Day' in Style
October 21, 2015, 4:19 PM
Consumer Reports Flexes Muscle, Hits Slumping Tesla Motors Stock
October 20, 2015, 4:13 PM
Debunked: Beneath the Lies, Nigerian "Pee Generator" Is Still Pissing Into the Wind
October 19, 2015, 7:53 PM
Hot Air? President Obama, G7 Pledge to Eliminate Most Fossil Fuel Use by 2100
June 8, 2015, 5:40 PM
Study Predicts Self-Driving Vehicles Could Rake in Billions
March 6, 2015, 8:34 AM
Dual-Motor Tesla Model S P85D's "Insane Mode" Shocks Passengers
January 28, 2015, 11:18 PM
Most Popular Articles
Creationists are Mad About Google Doodle Depicting Evolution
November 24, 2015, 8:48 PM
Jumbo Joust: iPad Pro vs. Surface Pro 3 vs. Surface Pro 4
November 11, 2015, 1:00 AM
BlackBerry Priv is an Amazing Android So Secure You May Never Hear of It
November 2, 2015, 2:46 PM
iPhone 7 May Pack 3-4 GB Memory, More Storage; 4-Inch Comeback is Rumored
November 20, 2015, 10:12 PM
"Prepare to be Punished": Microsoft is Killing OneDrive With Cuts, Blames Users
November 3, 2015, 8:23 PM
Latest Blog Posts
Sceptre Airs 27", 120 Hz. 1080p Monitor/HDTV w/ 5 ms Response Time for $220
Dec 3, 2014, 10:32 PM
Costco Gives Employees Thanksgiving Off; Wal-Mart Leads "Black Thursday" Charge
Oct 29, 2014, 9:57 PM
"Bear Selfies" Fad Could Turn Deadly, Warn Nevada Wildlife Officials
Oct 28, 2014, 12:00 PM
The Surface Mini That Was Never Released Gets "Hands On" Treatment
Sep 26, 2014, 8:22 AM
ISIS Imposes Ban on Teaching Evolution in Iraq
Sep 17, 2014, 5:22 PM
More Blog Posts
Copyright 2015 DailyTech LLC. -
Terms, Conditions & Privacy Information