6 Guns Shifting into Overdrive

The 2009 Cadillac CTS-V arrived with a supercharged 6.2L OHV V8 engine, the mighty LSA.  It also brought back an ‘expected’ Cadillac feature to the CTS-V line — an optional Automatic transmission.  But wait, what automatic transmission can be strapped to the back of a freight train like the LSA and live?  Enter the 6L90 Heavy Duty Automatic 6 speed Transmission to the world of sports cars.

2010 Hydra-Matic 6L90 (MYD) Six Speed RWD/AWD Automatic Transmission for Cadillac CTS-V

Overview

The Hydra-Matic 6L90 is six-speed automatic transmission for rear- and four-wheel-drive trucks, designed with modular flexibility and compatibility with advanced electronic controls. It is a heavy-duty version of the 6L80 six-speed automatic, with a strengthened input gear-set which has two additional pinion gears for six total, and a strengthened output gearset, that uses wider gears than the 6L80.  The 6L90 flexibility extends to the clutches where the 6L90 has one more clutch plate than the 6L80 in each clutch for heavy duty applications.

The 6L90 has the capability for adaptive shift controls and other features such as grade braking, and Driver Shift Control with tap up/tap down shifting as found in the CTS-V. A wide overall ratio spread of 6.04:1 allows a “steep” first gear, as well as very “tall” overdrive top gear for low-rpm highway cruising. With this wide ratio spread, acceleration is maximized, as is fuel economy. Engine noise is also lower during cruising. Both fifth and sixth gears are “overdrive” gears, for example.

As in the 6L80, gear changes from second to sixth gears are accomplished with clutch-to-clutch control, where an oncoming clutch is engaged and an “offgoing” clutch is released in a precise manner to achieve the ratio change. The first-to-second up-shift, however, is a freewheeling action, where the second gear clutch engages while the first gear one-way clutch spins freely. This allows a greater degree of smoothness at lower vehicle speeds. The clutch-to-clutch shifting and single freewheeler allows significant reductions in packaging requirements.

Advances in transmission control modules allow the modules to exist reliably inside the transmission, where temperatures remain fairly constant compared to a body-mounted module. The transmission and module are assembled together, so no additional steps are necessary during vehicle assembly.

The 32-bit transmission control module (TCM) monitors transmission performance and compensates for normal wear in components such as clutch plates, so transmission performance remains consistent for the life of the transmission. The control module also “tests” the components of the transmission following assembly to optimize the interaction of the components. The module is compatible with future global applications.

2010 Hydra-Matic 6L90 Transmission ( MYD )
Type: Six speed RWD / AWD, electronically controlled automatic overdrive transmission with torque converter clutch. Clutch-to-clutch architecture, with integral Electro / Hydraulic Controls Module
Maximum engine power: 452 bhp ( 337 kW ), Diesel: 300bhp ( 223kW ) – Truck
555 bhp ( 414 kW ) – Passenger car
Maximum engine torque: 531 lb-ft ( 720 Nm ), Diesel: 520 lb-ft ( 705 Nm ) – Truck
550 lb-ft ( 746 Nm ) – Passenger car
Maximum gearbox torque: 885 lb-ft ( 1200 Nm )
Gear ratios: MYD
First: 4.03
Second: 2.36
Third: 1.53
Fourth: 1.15
Fifth: 0.85
Sixth: 0.67
Reverse: -3.06
Maximum shift speed 6200 rpm
Maximum Validated Weights: ( Target ) GVW: 15000 lb ( 6803 kg ), GCVW: 21000 lb ( 9525 kg )
7-position quadrant: P, R, N, D, X, X, X ( X = available calibratable range position )
Case description: 3-piece ( Bell, main, extension )
Case material: die cast aluminum
Shift pattern: (2) Three-way on/off solenoids
Shift quality: Five variable bleed solenoid
Torque converter clutch: Variable Bleed Solenoid ECCC
Converter size: 300mm ( reference )
Fluid type: DEXRON® VI
Fluid capacity: w/ 300mm converter 300mm: 13.0L ( 10.8kg )
Transmission weight: w/ 300mm converter Wet: 109kg ( 240lb ) estimated
Pressure taps available: line pressure
Assembly Site: GMPT Ypsilanti, MI

GMPT Toledo, OH

GMPT Silao, MX
Applications: Chevrolet Suburban H.D.
GMC Yukon XL H.D.
Chevrolet Silverado HD
GMC Sierra HD

Cadillac CTS-V

Chevrolet Express

GMC Savana
Available Control Features: Multiple Shift Patterns ( Selectable )

Driver Shift Control ( Tap Up / Tap Down )

Enhanced Performance Algorithm Shifting ( PAS )

Selectable Tow / Haul Mode

Engine Torque Management On All Shifts

Altitude and Temperature Compensation

Adaptive Shift Time

Neutral Idle

Reverse Lockout

Automatic Grade Braking
Additional Features: OBDII / EOBD

Integral Electro/Hydraulic Controls Module ( Tehcm )

Control Interface Protocol – GMLAN

So, that begs the question — was the transmission rated to fit the engine output, or is the engine tuned to that output level because that is the maximum capability of the transmission?

Cadillac 6-Speed Automatic (6L50)

The current Cadillac CTS and STS both use a 6-Speed Automatic Transmission designated 6L50 by GM.  The RWD and AWD variants of each car all use the same versatile automatic transmission.  In the case of the STS, both the V6 and the Northstar V8 use this transmission.  The CTS-V uses the beefed up for the power 6L90 variant.

2010 Hydra-Matic 6L50 Transmission: Type: six speed RWD / AWD, electronically controlled automatic overdrive transmission with torque converter clutch. Clutch-to-clutch architecture, with integral Electro / Hydraulic Controls Module.

Only the Cadillac DTS continues with the 4L80e 4-Speed Automatic.  The addition of a 6-speed automatic in the CTS and STS allows for more responsive acceleration at a variety of speeds while still having good gearing for highway touring.  Cadillac and GM Power train continue to design tremendous flexibility into their key components.  When a single well-engineered, proven component such as the 6-Speed Auto 6L50 can be used in multiple configurations and multiple installations everyone benefits.

In the GM transmission naming scheme, 6 is for 6-speed, L is for longitudinally mounted (versus transverse as in FWD cars), and 50 indicates a mid-range torque capability.  Mid-range is relative, as this transmission’s power ranges exceed the top-end of the previous generation.  However, the V-Series and Corvette engines have established new definitions for high-torque.

The 6L50 is a ‘smart’ transmission.  It uses Enhanced Performance Algorithm Shifting to react appropriately for the dynamics of the situation the Cadillac is executing — holding gears through corners to avoid the disruption of a shift and torque transition.  It also allows driver gear selection similar to an automated manual transmission, but at no time does it lose the aplomb one expects of a luxury performance automobile.


Maximum engine power: 315 bhp ( 235 kw )
Maximum engine torque: 332 lb-ft ( 450 Nm )
Maximum gearbox torque: 480 lb-ft ( 651Nm )
Gear ratios: MYB
First: 4.06
Second: 2.37
Third: 1.55
Fourth: 1.16
Fifth: 0.85
Sixth: 0.67
Reverse: -3.2
Maximum shift speed 7000 rpm
Maximum Validated Weights: ( Target ) GVW: 6613 lb ( 3000 kg ), GCVW: 12505 lb ( 5672kg )
7-position quadrant: P, R, N, D, X, X, X ( X = available calibratable range position )
Case description: 3-piece ( Bell, main, extension )
Case material: die cast aluminum
Shift pattern: (2) Three-way on/off solenoids
Shift quality: Five variable bleed solenoid
Torque converter clutch: Variable Bleed Solenoid ECCC
Converter size: 240, 258mm ( reference )
Fluid type: DEXRON® VI
Fluid capacity: w/258mm converter 9.1 kg
Transmission weight: w/258mm converter wet: 85-90 kg ( 187-198 lb ) estimated
Pressure taps available: line pressure
Assembly sites: GMPT Strasbourg, France
GMPT Ypsilanti, MI
GMPT Silao, MX
Applications: Cadillac STS
Cadillac CTS
Cadillac CTS Wagon
Chevrolet Camaro
Buick Park Ave (China)
Available Control Features: Multiple Shift Patterns ( Selectable )
Driver Shift Control ( Tap Up / Tap Down )
Enhanced Performance Algorithm Shifting ( PAS )
Selectable Tow / Haul Mode
Engine Torque Management On All Shifts
Altitude and Temperature Compensation
Adaptive Shift Time
Neutral Idle
Reverse Lockout
Automatic Grade Braking
Additional Features: OBDII / EOBD
Integral Electro/Hydraulic Controls Module ( Tehcm )
Control Interface Protocol – GMLAN

2010 Hydra-Matic 6L50 (MYB)
Hydra-Matic 6L50 six-speed automatic RWD / AWD Car & Truck transmission

2010 Model Year Summary

Cadillac CTS and CTS Sport Wagon are new applications for 2010.

Modular Design for Application Flexibility

The major focus of activities for the 2010 will be quality improvements.

Modular design for application flexibility

The 6L50 was designed to accept different engines and different mounting locations, as well as the ability to mate to transfer cases for all-wheel-drive capability. For 2010, the applications are Cadillac CTS and CTS Wagon, STS, and Chevrolet Camaro. It is derived from the similar 6L80 rear- and all-wheel-drive capable six-speed automatic transmission available in the Chevrolet Corvette, Chevrolet Camaro, as well as Chevrolet, Cadillac, and GMC full-size SUVs.

Overview

The Hydra-Matic 6L50 six-speed automatic transmission for rear- and all-wheel-drive cars is designed with the same modular flexibility as the larger 6L80, as well as being fully compatible with advanced electronic controls. Its unique output gearset configuration enables it to have a wider range of ratios than a conventional planetary gearset automatic transmission.

The main housing for both the Northstar V8 and High Feature V6 in the CTS, STS sedans and the SRX crossover vehicle is identical. The modular concept of the new Hydra-Matic 6L50 centers on the desire for common components and manufacturing tooling for four different size variants of the new 6-speed family. Like the larger 6L80, the 6L50 uses three gearsets, a simple input planetary gearset, and two output gearsets, one of which is a compound gearset with three pairs of two pinion gears on the output carrier, one pair meshing with the sun gear and the other with the ring gear. This arrangement allows for optimal ratio steps with a 6.04:1 overall spread.

All applications feature adaptive shift controls. Several additional features such as grade braking, Performance Algorithm Shifting, and Driver Shift Control are available on some of the applications. Performance Algorithm Shifting (PAS), which detects when the vehicles are being driven in a spirited fashion and remains in its current gear ratio even when the driver lifts a foot off the accelerator pedal. PAS monitors how assertively the driver is using engine output to determine at what engine speed to upshift of downshift. Driver Shift Control, available in the STS and SRX, allows the driver to shift the transmission like a clutchless manual gearbox. Electronic safeguards prevent over-revving should the wrong gear position be accidentally selected.

The wide overall ratio spread of 6.04:1 allows a “steep” first gear, as well as very “tall” overdrive top gear for low-rpm highway cruising. Acceleration is maximized, as is fuel economy. Engine noise is also lower during cruising. Both fifth and sixth gears are “overdrive” gears, for example.

Gear changes from second to sixth gear ratios are accomplished with clutch-to-clutch action, where an “oncoming” clutch is engaged and an “offgoing” clutch is released in a precise manner to achieve the ratio change. The first-to-second upshift, however, is a freewheeling action, where the second gear clutch engages while the first gear one-way clutch spins freely. This allows a greater degree of smoothness at lower vehicle speeds. The manner in which each gear is selected in the 6L50 is optimized for best performance.

Advances in transmission control modules allow the modules to exist reliably inside the transmission, where temperatures remain fairly constant compared to a body-mounted module. The transmission and module are assembled together, so no additional steps are necessary during vehicle assembly.

The 32-bit transmission control module (TCM) monitors transmission performance and compensates for normal wear in components such as clutch plates, so transmission performance remains consistent for the life of the transmission. The control module also “tests” the components of the transmission following assembly to optimize the interaction of the components. The module strategy, developed by GM, is compatible with future global applications.

The CTS and STS V6 use a 258mm diameter torque converter which features a lockup clutch, which also makes use of GM’s proprietary electronic controlled capacity clutch (ECCC) technology. ECCC uses a small, regulated amount of slip to dampen out engine pulses. This creates a smoother running drivetrain, especially during shift events.

The 6L50 all-wheel-drive transfer case in the Cadillac CTS application uses an active center differential, responding to traction conditions and assigning torque to the axle with most available traction.

Low maintenance

The 6L50 uses DEXRON VI premium fluid, which is validated to improve durability and shift stability over the life of the transmission. DEXRON VI, was developed to have a more consistent viscosity profile; a more consistent shift performance in extreme conditions; and less degradation over time. Internal GM tests have demonstrated DEXRON VI delivers more than twice the durability and stability in friction tests compared to existing fluids. The DEXRON VI fluid was designed specifically and validated for the new family of GM six-speed automatic transmissions.

The Hydra-Matic 6L50 is produced in Ypsilanti, Michigan, Strasbourg, France, and Silao, Mexico.