C7 Corvette will get all NEW 8-SPEED AUTO

[S3XPanther]

Well, check this out: http://papers.sae.org/2014-01-1721/

"General Motors Rear Wheel Drive Eight Speed Automatic Transmission General Motors shall introduce a new rear wheel drive eight speed automatic transmission, known as the 8L90, in the 2015 Chevrolet Corvette. The rated turbine torque capacity is 1000 Nm. This transmission replaces the venerable 6L80 six speed automatic transmission.

The objectives behind creation of this transmission are improved fuel economy, performance, and NVH. Packaging in the existing vehicle architecture and high mileage dependability are the givens. The architecture is required to offer low cost for a rear drive eight speed transmission while meeting the givens and objectives. An eight speed powerflow, invented by General Motors, was selected. This powerflow yields a 7.0 overall ratio spread, enabling improved launch capability because of a deeper first gear ratio and better fuel economy due to lower top gear N/V capability, relative to the 6L80. The eight speed ratios are generated using four simple planetary gearsets, two brake clutches and three rotating clutches. The resultant on-axis transmission architecture utilizes a squashed torque converter, an off-axis pump and four close coupled gearsets. The three rotating clutches have been located forward of the gearsets to minimize the length of oil feeds which provides for enhanced shift response and simplicity of turbine shaft manufacturing.

The transmission architecture features a case with integral bell housing for enhanced powertrain stiffness. A unique pump drive design allows for off-axis packaging very low in the transmission. The pump is a binary vane type which effectively allows for two pumps in the packaging size of one. This design and packaging strategy not only enables low parasitic losses and optimum priming capability but also provides for ideal oil routing to the controls system, with the pump located in the valve body itself.

The transmission controller is externally mounted, enabling packaging and powertrain integration flexibilities. The controller makes use of three speed sensors which provide for enhanced shift response and accuracy. Utilization of aluminum and magnesium components throughout the transmission yields competitive mass. The dedicated compensator feed circuit, used in GM six speed designs, was supplanted by a lube-fed design in order to simplify oil routing and enhance shift response. Packaging is within that of the GM 6L80 design, allowing for ease of application integration.

The overall result is a robust, compact, and cost effective transmission which offers significant fuel economy and performance benefit, over its six speed counterpart, and shall provide an attractive balance of overall metrics in the automatic transmission market."

[DemonZL1]

Bad ass !

[Silverlsinva]

Must be the one they worked with ford with? I rather see a Dual clutch in vette since it is a sports car and most sports cars have Dual clutches cause they are quicker shifting.

[King T]

Thanks S3XPanther! Awesome news! I wish it was available at launch for the people who have bought the 2014 Model Year Stingray's sake.

Can't wait to hear even more details and info about it though!

[Truck Norris]

Originally Posted by Silverlsinva

I rather see a Dual clutch in vette since it is a sports car and most sports cars have Dual clutches cause they are quicker shifting.

+1

Even those affordable foreign Hot Hatch's have all gone to dual clutch transmissions. Even the Euro spec Ford and Chrysler/ Fiats have them.

[King T]

Originally Posted by Silverlsinva

I rather see a Dual clutch in vette since it is a sports car and most sports cars have Dual clutches cause they are quicker shifting.

It's on the way, just need more time to finish I guess

GM Files Patent For 7-Speed Dual-Clutch, Is Corvette First In Line?
http://www.motorauthority.com/news/1...-first-in-line

[KMPrenger]

This is awesome news, and will make the Corvette even more badass than it already is.

Automatic corvettes are already running deep into the 11s bone stock. 11.67 is the fastest I have seen. I'm guessing this transmission should shave another tenth or two off of that. Sweetness!

[S3XPanther]

Originally Posted by Truck Norris

+1

Even those affordable foreign Hot Hatch's have all gone to dual clutch transmissions. Even the Euro spec Ford and Chrysler/ Fiats have them.

http://papers.sae.org/2013-01-0232/

Don't worry, the hi-po will more than likely have one as well.

[S3XPanther]

These are all the patents that GM already has on DCT tech:

Patents

1 8,600,633 Full-Text Gear preselect systems for a dual clutch transmission
2 8,591,381 Full-Text System and method for controlling an automatic engine restart
3 8,590,684 Full-Text Control system for a dual clutch transmission
4 8,589,042 Full-Text System and method for adaptive transmission clutch torque control
5 8,585,548 Full-Text System and method for controlling an automatic engine stop-start
6 8,579,762 Full-Text Negative torque upshift offgoing clutch control systems and methods
7 8,579,751 Full-Text Hybrid powertrain with layshaft transmission and electric torque converter and method of controlling same
8 8,578,803 Full-Text Synchronizer actuation assembly
9 8,577,565 Full-Text Limiting branch pressure to a solenoid valve in a fluid circuit
10 8,573,084 Full-Text Dual clutch transmission
11 8,567,580 Full-Text Electro-hydraulic control system for a dual clutch transmission
12 8,567,273 Full-Text Gear transfer dual clutch transmission
13 8,561,502 Full-Text Dual drive pump system with one way clutches
14 8,560,192 Full-Text Control system and method for shift fork position in dual clutch transmissions
15 8,551,576 Full-Text Method for controlling a coefficient of friction
16 8,548,699 Full-Text Control system and method for adaptive control of transmission fluid operating pressures
17 8,543,279 Full-Text System and method for detecting and responding to pressure losses in a hydraulic automatic transmission
18 8,534,150 Full-Text Dual clutch multi-speed transmission
19 8,532,890 Full-Text Driven wheel torque estimation systems and methods
20 8,532,858 Full-Text Multi-speed hybrid powertrain with series and parallel operating modes
21 8,529,402 Full-Text Pump arrangement
22 8,528,711 Full-Text Control system for a dual clutch transmission
23 8,528,431 Full-Text Dual clutch transmission
24 8,521,382 Full-Text Transmission oil temperature estimation systems and methods
25 8,511,189 Full-Text Dual clutch multi-speed transmission
26 8,505,401 Full-Text Seven speed dual clutch transmission with four axes of rotation
27 8,505,400 Full-Text Dual clutch five speed transmission
28 8,504,267 Full-Text Control system and method for synchronization control in dual clutch transmissions
29 8,504,265 Full-Text System and method for decreasing acceleration disturbance during transmission upshifts
30 8,504,263 Full-Text Accumulator working volume management and adaptation
31 8,499,656 Full-Text Eight speed dual clutch transmission
32 8,495,926 Full-Text Dual clutch transmission
33 8,485,333 Full-Text Actuation device for a dual clutch transmission
34 8,485,056 Full-Text Dual clutch multi-speed transmission
35 8,479,602 Full-Text Seven speed dual clutch transmission with four axes of rotation
36 8,475,336 Full-Text Hydraulic control system for a dual clutch transmission
37 8,474,586 Full-Text Clutch actuation assembly with satellite pistons
38 8,474,341 Full-Text Dual clutch transmission
39 8,469,858 Full-Text Hybrid vehicle with dual clutch transmission
40 8,469,851 Full-Text Oil supply system for an automatic transmission of a vehicle, an automatic transmission and a vehicle comprising the oil supply system
41 8,464,851 Full-Text Electro-hydraulic control system for an automatic transmission
42 8,464,599 Full-Text Eight speed dual clutch transmission
43 8,459,135 Full-Text Seven speed dual clutch transmission having improved packaging
44 8,453,557 Full-Text Piston actuator assembly
45 8,443,688 Full-Text Method of learning an initial capacity point of a clutch in a dual clutch transmission
46 8,443,687 Full-Text Electro-hydraulic control system for a dual clutch transmission
47 8,443,686 Full-Text Seven speed dual clutch transmission
48 8,439,803 Full-Text System and method for improved closed throttle downshifts
49 8,438,941 Full-Text Eight speed dual clutch transmission
50 8,434,603 Full-Text Low content control system for a dual clutch transmission
51 8,434,380 Full-Text Dual clutch multi-speed transmission
52 8,433,487 Full-Text Shift sequencing systems for a dual clutch transmission
53 8,430,220 Full-Text Wet dual clutch transmission control system
54 8,429,994 Full-Text Hydraulic control systems for dual clutch transmissions
55 8,427,806 Full-Text Control system and method for transmission solenoids
56 8,425,376 Full-Text Multi-speed dual-clutch transmission for a hybrid vehicle
57 8,424,404 Full-Text Eight speed dual clutch transmissions
58 8,413,780 Full-Text Dual clutch for a transmission having multiple input shafts
59 8,413,777 Full-Text High efficiency hydraulic transmission control system
60 8,412,396 Full-Text Electric launch of a hybrid vehicle having a belt alternator starter and a dual clutch transmission
61 8,408,085 Full-Text Seven speed dual clutch transmission
62 8,403,792 Full-Text Hydraulic control systems for dual clutch transmissions
63 8,402,993 Full-Text Hydraulic fluid cooling system for a dual clutch automatic transmission
64 8,402,859 Full-Text Barrel cam shift mechanism
65 8,402,855 Full-Text Hydraulic control systems for dual clutch transmissions
66 8,396,634 Full-Text Method and apparatus for maximum and minimum output torque performance by selection of hybrid range state and input speed for a hybrid powertrain system
67 8,382,639 Full-Text Control system for a dual clutch transmission
68 8,376,109 Full-Text Lever applied dry clutch
69 8,375,817 Full-Text Dual clutch transmission
70 8,371,552 Full-Text Shift actuator valve having a pressure dead band
71 8,366,557 Full-Text Engine drive plate connection
72 8,365,893 Full-Text Dual clutch
73 8,365,622 Full-Text Reverse chain drive for motor vehicle transmissions
74 8,364,364 Full-Text System and method for controlling unpowered to powered transitions in vehicles having dry dual clutch transmissions
75 8,364,361 Full-Text Transmission clutch control apparatus and method
76 8,359,941 Full-Text Hydraulic control systems for dual clutch transmissions
77 8,356,529 Full-Text Hydraulic control systems for dual clutch transmissions
78 8,346,451 Full-Text Realtime estimation of clutch piston position
79 8,336,411 Full-Text Dual clutch multi-speed transmission
80 8,336,410 Full-Text Dual clutch multi-speed transmission
81 8,333,127 Full-Text Seven speed dual clutch transmission with four axes of rotation
82 8,327,730 Full-Text Dual clutch transmission
83 8,313,415 Full-Text Method and apparatus for clutch control in a vehicle having an engine start-stop powertrain and a dual-clutch transmission
84 8,302,500 Full-Text Dual clutch transmission
85 8,297,424 Full-Text Single actuator self-adjusting dry dual clutch
86 8,297,140 Full-Text Dual clutch five speed transmission
87 8,292,055 Full-Text Self-adjusting mechanisms for clutches
88 8,286,526 Full-Text Synchronizer actuating system
89 8,286,522 Full-Text Dual clutch transmission
90 8,285,463 Full-Text Method and system for calibrating a pressure sensor for an automatic transmission
91 8,276,439 Full-Text System and method for determining a volume of a torque converter clutch and calibrating a transmission
92 8,266,986 Full-Text Transmission hydraulic control system having a dual element pump
93 8,266,977 Full-Text Seven speed dual clutch transmission
94 8,241,161 Full-Text Hybrid module for interconnecting an engine and a transmission
95 8,240,224 Full-Text Dual clutch five speed transmission
96 8,234,946 Full-Text Hydraulic control system for a dual clutch transmission
97 8,225,915 Full-Text Dual clutch torque converter control system
98 8,225,687 Full-Text Hydraulic control systems for dual clutch transmissions
99 8,224,537 Full-Text Method and apparatus for dry clutch temperature prediction in a DCT
100 8,221,279 Full-Text Dual apply clutch apparatus for compact electro-mechanical transmission
101 8,220,352 Full-Text Dual clutch transmission
102 8,220,351 Full-Text Dual clutch multi-speed transmission having one countershaft and a reverse shaft
103 8,210,066 Full-Text Electromagnetic synchronizer actuating system
104 8,206,265 Full-Text Control system for dual clutch transmission
105 8,192,176 Full-Text Hydraulic fluid supply system having active regulator
106 8,191,441 Full-Text Hybrid powertrain and dual clutch transmission
107 8,190,343 Full-Text Gear actuator control systems and methods for dual clutch transmissions
108 8,189,336 Full-Text Composite cover with integral heat sink
109 8,166,841 Full-Text Manual transmission for a motor vehicle
110 8,150,586 Full-Text Method for synchronized transmission gear ratio engagement
111 8,137,241 Full-Text System and method for automatic transmission shift control
112 8,117,935 Full-Text Synchronizer actuating system with selectives
113 8,117,933 Full-Text Five speed dual clutch transmission
114 8,117,932 Full-Text Multi-speed transmission with countershaft gearing
115 8,116,951 Full-Text Transmission with substantially identical gear sets for torque load sharing
116 8,104,367 Full-Text Seven speed dual clutch transmission
117 8,104,366 Full-Text Double-clutch transmission for vehicles
118 8,091,696 Full-Text Rocker clutch assembly
119 8,070,649 Full-Text Hybrid powertrain and dual clutch transmission
120 8,070,638 Full-Text Dual input planetary final drive
121 8,065,930 Full-Text Hydraulic actuator for transmissions having reduced noise
122 8,056,663 Full-Text Hybrid module for interconnecting an engine and a dual-clutch transmission
123 8,056,429 Full-Text Multi-speed dual clutch transmission with countershaft gearing arrangement
124 8,038,564 Full-Text Multi-speed transmission
125 8,011,261 Full-Text Multi-speed transmission with countershaft gearing arrangement
126 7,988,772 Full-Text Air/oil separator for transmissions and transaxles
127 7,987,740 Full-Text Multi-speed transmission with countershaft gearing arrangement
128 7,985,283 Full-Text System for de-aerating a hydraulic fluid in a transmission
129 7,980,374 Full-Text Flow accumulator and clutch control system for automatic transmissions
130 7,972,235 Full-Text Hybrid powertrain system having selectively connectable engine, motor/generator, and transmission
131 7,963,191 Full-Text Hybrid powertrain and dual clutch transmission
132 7,913,580 Full-Text Apparatus and method for securing transmission gear synchronizers to shafts
133 7,896,775 Full-Text Control system for electronic range selection in a dual clutch transmission
134 7,896,770 Full-Text Multi-speed transmission
135 7,886,626 Full-Text Multi-speed dual clutch transmission
136 7,870,804 Full-Text Multi-speed dual clutch transmission
137 7,846,055 Full-Text Multi-speed split dual clutch transmission
138 7,845,247 Full-Text Shift fork actuation system for control of synchronizer position
139 7,837,589 Full-Text Multi-speed split dual clutch transmission
140 7,832,298 Full-Text Countershaft clutch and gear assembly
141 7,828,684 Full-Text Control system for a differential in a transmission
142 7,752,935 Full-Text Control system for a multi-speed transmission
143 7,752,934 Full-Text Multi speed transmission having a countershaft gearing arrangement
144 7,743,678 Full-Text Selectable one-way rocker clutch
145 7,743,677 Full-Text Powertrain with torque converter and axially compact seven speed dual clutch transmission
146 7,703,346 Full-Text Multi-speed transmission with countershaft gearing
147 7,695,390 Full-Text Multi-speed transmission
148 7,669,497 Full-Text Powertrain with torque converter and axially compact seven speed dual clutch transmission
149 7,644,639 Full-Text Multi-speed transmission with countershaft gearing
150 7,640,818 Full-Text Multi-speed transmission with a countershaft gearing
151 7,610,825 Full-Text Multi-speed transmission with countershaft gearing
152 7,604,561 Full-Text Multi-speed countershaft transmission with a planetary gear set and method
153 7,597,644 Full-Text Nine or ten speed split clutch countershaft automatic transmission
154 7,524,265 Full-Text Powertrain overspeed protection
155 7,478,572 Full-Text Transmission with torque sensors and method of controlling a transmission
156 7,437,963 Full-Text Power transmission
157 7,415,905 Full-Text Vehicular transmissions utilizing slipper ring clutch control
158 7,401,687 Full-Text Dual clutch engine coupling damper
159 7,353,724 Full-Text Multi-speed transmission with Hi-Lo output torque-transmitting mechanisms and gear sets
160 7,322,456 Full-Text Radially stacked dual dry clutch configuration
161 7,311,630 Full-Text Multi-speed transmission with differential gear set and countershaft gearing
162 7,235,037 Full-Text Friction launch control system for a vehicle

[Number 3]

Originally Posted by Silverlsinva

Must be the one they worked with ford with? I rather see a Dual clutch in vette since it is a sports car and most sports cars have Dual clutches cause they are quicker shifting.

I think the JV is on FWD transmissions similar to the 6 speeds they are using jointly today.

[Apex Motorsports]

This is really cool stuff. The Camaro SS historically gets its drive train from the Vette so with less weight, more power, and improved gear box technology we are going to be looking at serious performance and great fuel economy in the 6th Gen.

[SS 376]

Originally Posted by Silverlsinva

Must be the one they worked with ford with? I rather see a Dual clutch in vette since it is a sports car and most sports cars have Dual clutches cause they are quicker shifting.

This. Hopefully we will see a proper DCT in the Vette in a couple years.

[EnlighteningYou]

Sounds awesome, hearing it shift 8 times would be pretty unique lol.

[Padre]

I wonder if we can transplant them in to the SS?

With my HP level, I may be in the market to replace my 6L80E soon enough.

Padre