Chrysler Readies Nine-Speed Auto Transmissions to Cut Fuel Consumption
August 1, 2012 9:21 AM
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The Chrysler 300 will be a recipient of the new 9-speed automatic transmission.
A 16% improvement in fuel efficiency is expected from nine-speed transmission
Automakers are pulling out all the stops and looking to squeeze every single mile per gallon out of their automobiles by any means necessary. Automakers are looking at more
fuel-efficient engines with smaller displacements
, but they're also looking at
reducing the weight of vehicles
increasing the number of forward gears
used in car/truck transmissions.
Adding forward gears
to a transmission makes a lot of sense because the slower the engine spins, the less fuel it consumes. In years past automatic transmissions used in vehicles commonly had four or five forward gears. More recent vehicles are moving up to six-speed and in some cases even eight-speed automatic transmissions in luxury vehicles. Chrysler is eyeing even more gears inside with nine-speed gearboxes for more mainstream vehicles.
According to Mircea Gradu, vice president transmission powertrain driveline engineering, Chrysler will roll out its first nine-speed transmission by the first half of 2013. “I’m convinced that, sooner or later, others will come up with similar solutions,” Gradu said in an interview from his office in Auburn Hills, Michigan, where Chrysler is based. “Hopefully, the time will be as long as possible until they catch up with the technology.”
Chrysler CEO Sergio Marchionne believes that the automaker and its various brands will be able to meet looming fuel-efficiency standards by using technology that improves traditional gasoline engines combined with better transmissions rather than moving to plug-in hybrids and pure electric vehicles.
will reach 54.5 mpg by 2025.
Michael Omotoso, a powertrain analyst at LMC Automotive, said, "They’re [Chrysler] doing basically the bare minimum to satisfy government regulations. Their strategy is to meet the standards with minimum investment.”
reports that the nine-speed transmission Chrysler is developing could boost fuel economy of certain models by as much as 16%. Chrysler has already scored a 15% boost in the highway fuel economy of the Chrysler 300 and Dodge Charger by adding an eight-speed automatic transmission.
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RE: This is the solution to a reliable high torque capacity CVT
8/2/2012 1:53:39 AM
All the transmissions that failed on you were probably made for Chrysler by Mitsubishi.
But it isn't entirely Mitsubishi's fault. For example, for almost two decades, Chrysler used the F4A22-2 transmission supplied by Mitsubishi in their minivans with 3.0l and 3.3l V6's. These transmissions were rated for light vehicle use (they were common in the Galant and the Hyundai Sonata, which used the same Mitsubishi V6 as the Galant.)
Chrysler thought they'd out-wit the laws of physics putting a transmission rated for a 3000lb vehicle in a 4000lb vehicle with half the aerodynamics. Obviously most of these transmissions needed multiple rebuilds because the overdrive bands burned up or the 1st gear solenoids failed.
RE: This is the solution to a reliable high torque capacity CVT
8/2/2012 7:46:41 AM
the f4a33/w4a33 is one of the most bulletproof transmissions ever put into a car. legions of DSM guys are running 9's with them.
i would say it's chrysler that doesn't know how to build a transmission worth a crap.
for what it's worth though, most consumers don't need more than 4 non-overdrive forward speeds. 5 if you count the 5th as 1:1. overdrive has been a shortcoming on production automobiles for quite some time (especially on fleet vehicles that get a lot of mileage). .50:1 isn't a great ratio for accelerating, but it's terrific for crusing at 75mph on the highway.
there is a reason semi-trucks may have anywhere from 9 to 18 different forward gears. i'm glad to see that automakers in the past 10 years have finally began to offer the consumer choices that should have been offered back in 1974.
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