Quick Note: Mercedes Brings Nine-Speed Automatic to E-Class
July 22, 2013 11:34 AM
comment(s) - last by
it will gain a combined fuel economy of 53.3 MPG from 51.4 MPG
Mercedes is updating its
with a new nine-speed automatic.
Last weekend, Mercedes-Benz’s German language website configurator revealed that the nine-speed automatic -- known as 9G-Tronic -- will now be standard on the rear-wheel-drive E350 BlueTec. It will replace the seven-speed 7G-Tronic automatic gearbox, which will now be standard equipment on the E220 BlueEfficiency Edition.
While bringing the 9G-Tronic along won't change the E350 BlueTec’s ability to hit 0-62 MPH in 6.6 seconds, it will gain a combined fuel economy [European rating] of 53.3 MPG (from 51.4 MPG with the 7G-Tronic). This is due to a boost in city MPG from 40.9 to 44.1.
The 9G-Tronic also brings reduced average CO2 emissions from 144g/km to 138g/km.
Back in May, Mercedes said it was aiming for
45 MPG highway
on the new 2014 E250 Bluetec 4Matic diesel sedan. Its 2.1-liter, 4-cylinder turbodiesel engine uses twin sequential turbochargers for 195 HP and 369 lb-ft of torque.
This article is over a month old, voting and posting comments is disabled
RE: Are 9 Gears Really Necessary?
7/23/2013 4:42:50 PM
If you are speaking in respect to having the extra gear ratios I would agree - 9 gears is more efficient than 6 for keeping an engine within its most efficient rpm range for the load it is under. BUT the actual mechanical operation of any hydraulic automatic transmission is horribly inefficient. The parasitic losses from driving the hydraulics and the slippage of the torque converter are horrible. Lockup converters help, but you still get major frictional losses and heat from the large number of clutches and bands needed to control the sun, ring and planet gears in planetary gear transmissions.
Think about it for a minute. A 4-speed (3 plus overdrive & reverse) automatic transmission has a total of 2 bands and 4 clutches. For purpose of figuring losses, think of a band as another clutch. Each clutch in the driveline introduces frictional power losses. So 6 clutches in total for a simple 4 speed tranny.
Now just imagine the complexity and inefficiency of 9 speeds. Add another band and clutch for each new planetary gearset.
If car makers really need to go turn to stratospheric numbers of speeds, they really should think about moving away from the common slushbox that has been around since the 1950s. There are better ways of incorporating high numbers of gears without incurring all the parasitic and frictional losses.
"People Don't Respect Confidentiality in This Industry" -- Sony Computer Entertainment of America President and CEO Jack Tretton
Mercedes Aims for 45 MPG Highway on New E250 Bluetec 4Matic Diesel Sedan
May 20, 2013, 8:20 AM
Quick Note: GM Teases Next Generation Chevrolet Volt
November 20, 2014, 3:26 PM
Audi is Latest to Step Into the Hydrogen Game, Delivers A7 Sportback h-tron quattro
November 19, 2014, 1:41 PM
Toyota’s Mirai Hydrogen Fuel Cell Vehicle Priced from $57,500 in the U.S.
November 18, 2014, 10:23 AM
Honda Still Pushing Hydrogen, Introduces FCV Fuel Cell Concept
November 17, 2014, 8:27 AM
Ford Enlists Wind Energy Corp. to Provide Wind, Solar Energy to Four U.S. Dealerships
November 10, 2014, 10:58 AM
AutoNation CEO Calls Slams Michigan’s “Anti-Tesla Bill”, Chides Elon Musk
November 7, 2014, 6:52 PM
Most Popular Articles
Uber Exec Threatens to "Spend Millions" to Stalk Female Reporter and Her Family
November 19, 2014, 12:31 PM
Apple Replaces “FREE” Label with “GET” on App Downloads in iTunes App Store
November 19, 2014, 5:38 PM
Rand Paul Casts Crucial "No" Vote on Obama-Backed PATRIOT Act Renewal Bill
November 19, 2014, 5:15 PM
FTC Announces Crackdown on Computer Speedup/Tech Support Scams
November 20, 2014, 1:40 PM
Wal-Mart: Miss Thanksgiving, Get Xbox One + Master Chief Collection for $299
November 17, 2014, 9:40 PM
Latest Blog Posts
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
Space Terrorism is a Looming Threat For the United States
Apr 23, 2014, 7:47 PM
More Blog Posts
Copyright 2014 DailyTech LLC. -
Terms, Conditions & Privacy Information