: What are our gear ratios?



deckofficer
10-17-11, 08:56 PM
I've never seen this before, makes me think the current automotive journalists just don't do their research. I have seen 3 different gear ratio sets for the 6 speed manual. Also seen a couple different rear ends. So that my speed in gears calculators gives me proper speeds, I need to know tire size (I think 2.85 35 19) rear end (I think 3.73) and those gear ratios in the Tremec box.

Thanks

Bob

Gary Wells
10-17-11, 09:10 PM
Cad CTS-V2 automatic versus manual trans data (as of 05-16-2010):

Manual trans (M6): Tremec TR6060 6 speed manual,
fully synchronized with single overdrive (MG9):
Gear ratios (:1) 1st: 2.66, 2nd: 1.78, 3rd: 1.30, 4th: 1.00,
5th: 0.80, 6th: 0.63, final: 3.73, reverse: 2.90

Gas Guzzler (GG) tax of $1300, or half that of the A6
Faster by 16 MPH (191 MPH versus 175 MPH (governed))
A tad slower in the 1/4 & on the street
A tad better *mileage* than the *auto* but probably not significant
About 38 more RWHP than the auto on the average
About 30 more RWTQ that the auto
About 95 lbs lighter that the auto
No remote start feature
Has “no lift-shift” feature


Automatic trans (A6): Hydra-matic 6L90E 6 speed
electronically controlled automatic overdrive with
torque converter clutch (MYD): Gear ratios (:1) 1st:
4.03, 2nd: 2.36, 3rd: 1.53, 4th: 1.15, 5th: 0.85, 6th: 0.67,
final: 3.23, reverse: 3.06

Gas Guzzler (GG) tax of $2600, or twice that of the M6
Slower by 16 MPH (175 MPH (governed) versus 191 MPH)
A tad quicker in the 1/4 & on the street
A tad worse mileage than the manual but probably not significant
About 38 less RWHP than the manual on the average
About 30 less RWTQ that the manual on the average
About 95 lbs heavier that the manual
Remote start feature
Normal mode initially starts in 1st gear, then starts in 2nd gear thereafter
Manual mode starts in 1st gear always

About 1 in every 6 ’09 CTS-V’s were / are manual trans (M6)


I believe that this should still be reasonably accurate, Bob.
However, it was originally done in about '10 or so.
Shouldn't be a lot of changes.

garfin
10-17-11, 09:43 PM
Cad CTS-V2 automatic versus manual trans data (as of 05-16-2010):

Manual trans (M6): Tremec TR6060 6 speed manual,
fully synchronized with single overdrive (MG9):
Gear ratios (:1) 1st: 2.66, 2nd: 1.78, 3rd: 1.30, 4th: 1.00,
5th: 0.80, 6th: 0.63, final: 3.73, reverse: 2.90

Gas Guzzler (GG) tax of $1300, or half that of the A6
Faster by 16 MPH (191 MPH versus 175 MPH (governed))
A tad slower in the 1/4 & on the street
A tad better *mileage* than the *auto* but probably not significant
About 38 more RWHP than the auto on the average
About 30 more RWTQ that the auto
About 95 lbs lighter that the auto
No remote start feature
Has “no lift-shift” feature


Automatic trans (A6): Hydra-matic 6L90E 6 speed
electronically controlled automatic overdrive with
torque converter clutch (MYD): Gear ratios (:1) 1st:
4.03, 2nd: 2.36, 3rd: 1.53, 4th: 1.15, 5th: 0.85, 6th: 0.67,
final: 3.23, reverse: 3.06

Gas Guzzler (GG) tax of $2600, or twice that of the M6
Slower by 16 MPH (175 MPH (governed) versus 191 MPH)
A tad quicker in the 1/4 & on the street
A tad worse mileage than the manual but probably not significant
About 38 less RWHP than the manual on the average
About 30 less RWTQ that the manual on the average
About 95 lbs heavier that the manual
Remote start feature
Normal mode initially starts in 1st gear, then starts in 2nd gear thereafter
Manual mode starts in 1st gear always

About 1 in every 6 ’09 CTS-V’s were / are manual trans (M6)


I believe that this should still be reasonably accurate, Bob.
However, it was originally done in about '10 or so.
Shouldn't be a lot of changes.

110% accurate... no changes from then.

Best regards,

Elie

Gary Wells
10-17-11, 09:52 PM
Many thanks for the verification, Elie. I was hoping but wasn't sure.

deckofficer
10-17-11, 09:58 PM
And all the numbers work in my "speed in gears" calculator. Wiki, and many magazines has it all wrong, so I guess if you need the correct numbers, you need to ask on this forum. It just drives my point home that Caddy screwed us for that title of "fastest sedan" by having track gears instead of highway gears. Do you know just a change of 6th gear from 0.63 to 0.50 would have saved us $1300 GG tax, and raised the 21 MPG (or less) for easy highway cruise to 25+ mpg. This is the only gripe I have on the V, not a tall enough top cog.

A 0.50 OD would allow us to cruise at 75 and be turning all of 1825 rpm. I would love that!!

Thanks Gary.


Bob

BeagleBrains
10-17-11, 10:00 PM
Resources:
http://motortrend.automotive.com/140211/1007-2011-cadillac-cts-v-coupe-test/transmission.html

elphil
10-18-11, 01:14 AM
Bob, you may be right about the proper gears in the manual trans', but the "fastest sedan" had an automatic and the highest speed recorded on the lap was in fifth gear.

Torxila
10-18-11, 04:57 PM
http://i134.photobucket.com/albums/q96/torxila/Wheels%20Mar%202011/Untitled.png

ratio references

I'm very seriously concidering having 5th & 6th changed to C6 ratios. Just waiting on confirmation of parts and pricing.

Hell my 780rwhp TT C6 would get 28 hyw at 80-85mph.

George

deckofficer
10-18-11, 11:29 PM
MG 9 would be my current gearing, but what is meant by the low torque and hp numbers? And if you had any desire to do 191 mph, that won't happen with the taller gear, not enough power at the new rpm. But I want the taller gear.

Torxila
10-19-11, 04:36 PM
MG 9 would be my current gearing, but what is meant by the low torque and hp numbers? And if you had any desire to do 191 mph, that won't happen with the taller gear, not enough power at the new rpm. But I want the taller gear.

Overview
Both the standard Corvette and the high-performance Z06 use the TR6060 designated as MM6, which is validated to 500 lb-ft of torque, while the TR6060 with the Z51 option features higher ratios and is designated as MZ6. It is validated to 430 lb-ft of torque. The ultra high performance ZR1 uses the TR6060 designated as the MH3, which is validated to 650 lb-ft of torque. The CTSv uses the MG9 version of the TR6060 validated to 560 lb-ft of torque. The Camaro uses the M10 gear set validated to 430 lb-ft of torque.

What do you meen by low torque & HP numbers?



A simple lower pulley swap and tune would give you enough power/torque to compensate for "lazy" 5th & 6th.

I'm going a little bit more with mods over the winter so I won't have a problem if I run "Texas-Mile" type of things. 1/4 mile would not be an issue (4th gear max). Cruising on highway is my reason to change for better mpg average.

George

hunterkiller
10-25-11, 08:57 PM
Please let me know what the cost are. I hit my rev limiter at the texas mile in 5th at 180 mph Pluse and ended up traping at 179 mph. I need taller tires or higher gearing in 5th and possibly 6th If I get better milage and the price is wright I would rather change my gearing. Please call me at 210 601-5313 and ask for Dan. Thanks

Torxila
10-26-11, 10:18 AM
Please let me know what the cost are. I hit my rev limiter at the texas mile in 5th at 180 mph Pluse and ended up traping at 179 mph. I need taller tires or higher gearing in 5th and possibly 6th If I get better milage and the price is wright I would rather change my gearing. Please call me at 210 601-5313 and ask for Dan. Thanks


Dan, I will let you know after I have mine done. I am getting my mods done over the winter, but I've got you in my BB for a scheduled call back.
Regards,
George