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Topic: XLR-V Caddy gets 6 Speed auto

in Forum: C6 Driveline Components


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XLR-V Caddy gets 6 Speed auto (1/6)
 3/23/05 4:00pm
cafranz1
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Prescott, AZ - USA

Vette(s):
60 with both tops 68 with t-tops


Joined: 5/20/2003
Posts: 151

At the NY aauto show...

The V-Series version of Caddy's hardtop roadster gets not only the new supercharged Northstar engine, and a 0-60 mph time of less than 5.0 seconds, it also gets the first rear-drive application of GM's new six-speed automatic transmission.

Come on GM lets get it for the C6 also. |frown|

|UPDATED|3/23/2005 1:00:01 PM (AZT)|/UPDATED|


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Curt Franz LeMans Blue Coupe born on Sept 15th, 2005
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XLR-V Caddy gets 6 Speed auto (2/6)
 3/23/05 3:50pm
dstelbrink@fbmtg.com
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jacksonville, FL - USA

Vette(s):
1973 convertible, original owner 2000 convertible


Joined: 3/14/2005
Posts: 2

GM's option list for the 2006 model has option

mx0 transmission, 6 speed auto.

I think GM plans to put the transmission in in the coupe and convertible but it is not an option in the Z06

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XLR-V Caddy gets 6 Speed auto (3/6)
 3/23/05 3:59pm
cafranz1
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Prescott, AZ - USA

Vette(s):
60 with both tops 68 with t-tops


Joined: 5/20/2003
Posts: 151

Unfortunately, the Montana dealer that posted the bit about C6 and 6 speed auto in 2006 has taken it back. The Caddy (XLR not SLT) announcement at least gets it near the Corvette in the Bowling Green plant. |frown|

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Curt Franz LeMans Blue Coupe born on Sept 15th, 2005
XLR-V Caddy gets 6 Speed auto (4/6)
 3/25/05 10:02am
cafranz1
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Prescott, AZ - USA

Vette(s):
60 with both tops 68 with t-tops


Joined: 5/20/2003
Posts: 151

Here is some text from Autoweek. The 6 speed and the car are supposed to appear in the first Quarter of 2006.

Power routes to the rear wheels through a new rear-mounted, six-speed automatic transmission that incorporates some of GM’s best features, such as Performance Algorithm Shifting, which prevents upshifts in high-lateral acceleration maneuvers even if the driver lifts off the accelerator, and Performance Algorithm Liftfoot, which minimizes upshifts during closed-throttle driving and cornering to prevent unnecessary shifting.

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Curt Franz LeMans Blue Coupe born on Sept 15th, 2005
XLR-V Caddy gets 6 Speed auto (5/6)
 3/25/05 3:13pm
Adam Wartell
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Eagleville, PA - USA

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1979 "Corvette Red" Coupe


Joined: 5/16/2003
Posts: 3305

Doesn't having a six-gear auto also help save gas at highway speeds?
XLR-V Caddy gets 6 Speed auto (6/6)
 4/8/05 12:22pm
cafranz1
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Prescott, AZ - USA

Vette(s):
60 with both tops 68 with t-tops


Joined: 5/20/2003
Posts: 151

To answer Adam's question and look at the "why" of a 6 speed auto lets work some numbers:

The various first gear thru top gear ratios are:

4L65E (A4)= {3.06,1.63,1.00,0.70} (4 speed auto)
6L80E (A6)= {4.027,2.364,1.532,1.152,0.852,0.667}(6 speed auto)
T56 (M6) = {2.66,1.78,1.30,1.00,0.74,0.50} (6 speed manual)

Some quick calculations give the following torque multiplication factors for axle ratios times tranny gear ratios. These use the Corvette axle ratios with the known Caddy A6.

2.56*x6L80E = <10.31, 6.05, 3.92, 2.95, 2.18, 1.71> (*expected axle with A6)
2.73*x4L65E = < 8.35, 4.45, 2.73, 1.91> (*current std A4 axle)
3.15*x4L65E = < 9.64, 5.13, 3.15, 2.21> (*current hi perf A4 axle)
3.42*xT56 = < 9.10, 6.09, 4.45, 3.42, 2.53, 1.71> (*current M6 axle)

Comment 1: The last number in each series is the top effective axle ratio. The 1.71 ratio of the 6 speed manual is matched by the 6 speed auto! Yes Adam that should give a better highway EPA rating.

Comment 2: The 10.31 first gear of the A6 might require a very large tire budget.

Comment 3: The A6 appears to give the best of both worlds. These data were first assembled by RK on another board. |cheers|

|UPDATED|4/8/2005 9:22:27 AM (AZT)|/UPDATED|


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Curt Franz LeMans Blue Coupe born on Sept 15th, 2005
Our Sponsors help support C6VR