release date for trans. and diff. specs. ????
10-26-2012, 12:12 PM
#1
Melting Slicks
Thread Starter
release date for trans. and diff. specs. ????
Any chance we might get a 3:70 ???
Date of release ????
Date of release ????
10-26-2012, 01:05 PM
#2
Team Owner
I would like to see a 3.90 rear gear and the ZR1 transmission used(with the 2.29 1st gear, but with an additional 7th gear of .43)
2.29 X 3.90 = 8.93 = 58 MPH
1.61 X 3.90 = 6.24 = 83 MPH
1.21 X 3.90 = 4.72 = 111 MPH
1.00 X 3.90 = 3.90 = 134 MPH
0.81 X 3.90 = 3.16 = 165 MPH
0.67 X 3.90 = 2.61 = 200 MPH
0.43 X 3.90 = 1.68 = good gas mileage
Compared to the C6 entry level transmission
2.66 X 3.42 = 9.10 = 57 MPH
1.78 X 3.42 = 6.09 = 86 MPH
1.30 X 3.42 = 4.45 = 117 MPH
1.00 X 3.42 = 3.42 = 153 MPH
0.74 X 3.42 = 2.53 = 207 MPH
0.50 X 3.42 = 1.71 = good gas mileage
2.29 X 3.90 = 8.93 = 58 MPH
1.61 X 3.90 = 6.24 = 83 MPH
1.21 X 3.90 = 4.72 = 111 MPH
1.00 X 3.90 = 3.90 = 134 MPH
0.81 X 3.90 = 3.16 = 165 MPH
0.67 X 3.90 = 2.61 = 200 MPH
0.43 X 3.90 = 1.68 = good gas mileage
Compared to the C6 entry level transmission
2.66 X 3.42 = 9.10 = 57 MPH
1.78 X 3.42 = 6.09 = 86 MPH
1.30 X 3.42 = 4.45 = 117 MPH
1.00 X 3.42 = 3.42 = 153 MPH
0.74 X 3.42 = 2.53 = 207 MPH
0.50 X 3.42 = 1.71 = good gas mileage
Last edited by JoesC5; 10-26-2012 at 01:14 PM.
10-26-2012, 04:58 PM
#4
What does your Vette currently tach at 80 mph? Why not a gear that would allow it to tach less? Unless you road track it, where else would you need an extra gear? If you road track it at high speed tracks I understand that it would be useful to put the gears between 1 and 5 closer together.
10-26-2012, 06:14 PM
#5
Team Owner
With 7 (or 8 for the automatic?) forward gears it is possible that the cars will have (either standard or optional) more aggressive rear axle ratios...but I highly doubt it will be 3.90s (or even in the 3.70 (3.73) range).
But at least something in the 3.55 range would be nice.
I hope not either, I'm hoping for only two overdrives and the rest making up a very tight, close ratio gearbox but I'm not counting on it.
But at least something in the 3.55 range would be nice.
I hope not either, I'm hoping for only two overdrives and the rest making up a very tight, close ratio gearbox but I'm not counting on it.
10-26-2012, 07:46 PM
#6
Melting Slicks
Thread Starter
What does your Vette currently tach at 80 mph? Why not a gear that would allow it to tach less? Unless you road track it, where else would you need an extra gear? If you road track it at high speed tracks I understand that it would be useful to put the gears between 1 and 5 closer together.
I do track my Z06 probably 30 days a year at high speed (think Sebring) tracks and would really like another gear to use at the track. We basically
use 3rd and 4th at the track.
And I do plan to track the C7 from day 1.
I will let you know how she does.
10-26-2012, 07:50 PM
#7
Melting Slicks
Thread Starter
With 7 (or 8 for the automatic?) forward gears it is possible that the cars will have (either standard or optional) more aggressive rear axle ratios...but I highly doubt it will be 3.90s (or even in the 3.70 (3.73) range).
But at least something in the 3.55 range would be nice.
I hope not either, I'm hoping for only two overdrives and the rest making up a very tight, close ratio gearbox but I'm not counting on it.
But at least something in the 3.55 range would be nice.
I hope not either, I'm hoping for only two overdrives and the rest making up a very tight, close ratio gearbox but I'm not counting on it.
A couple of optional ratios would be nice but I doubt we will see that..
But we can hope.
Any dates for the drivetrain release??????
10-26-2012, 10:04 PM
#8
Team Owner
A 3.73 rear (either standard or optional) for the manual car and maybe a 3.2x or 3.3x for the automatic (with it's much steeper first gear I assume?) would rock.
With all of these proposed/rumored extra transmission gears and tall diameter wheels/tires it could still deliver the fuel economy too.
10-26-2012, 10:17 PM
#9
no sports car should have an overdrive.
IMO gear it to just touch 200 - 205 mph. With a 6 or 7 speed gearbox, youll still get decent mileage at american highway speeds in the final gear without screwing up the character of the car.
IMO gear it to just touch 200 - 205 mph. With a 6 or 7 speed gearbox, youll still get decent mileage at american highway speeds in the final gear without screwing up the character of the car.
10-26-2012, 10:23 PM
#10
Jack junior, is that you? 
10-26-2012, 10:55 PM
#12
Le Mans Master
I'd much rather have a car geared to arrive at 155mph very quickly rather than a 200mph car.
The C7 needs 6 tight gears and one gappy 3rd overdrive that is good at 80 and over only.
The C7 needs 6 tight gears and one gappy 3rd overdrive that is good at 80 and over only.
10-26-2012, 11:06 PM
#13
Safety Car
It's premature to hope for a certain axle ratio without yet knowing the transmission's gear ratios, it's only half the equasion.
The new 7-speed trans is likely to have new gear ratios, not just another gear added to one of the 6-speeds.
A 7-speed manual trans with evenly spaced rarios sounds like a great idea, no more big rpm drop to the tall overdrive ratio. Initially I was envisioning an aggressive overall ratio in 1st gear like the C5Z06/C6Z51/C6GS, which is a lot of fun. But that would require a 1-2 shift before 60, increasing 0-60 times. They're claiming the base C7 will do 0-60 in under 4 seconds.
As with the LS7 and LS9, they might use tall gearing to allow the C7 to reach 60 in first, no 1-2 shift to hurt the all-important 0-60 bragging rights.
Assuming tire diameters remain about the same and with the 6600 rpm redline, the overall ratio in 1st would need to be around 8:00 to 1 or less to do 60 in 1st. If a 3:42 axle was used this would require a first gear ratio like the ZR1's 2:29 or 2:23.
Gearing like this doesn't sound like much fun for those of us who like to shift but the car would really be plenty quick with 50 ft/lb more torque and a couple hundred less pounds to pull.
The best solution might be to equip the light base car with tall gears for the best advertised 0-60 time and EPA numbers. The optional performance package (Z51?) could include better gearing in addition to dry sump, big brakes with slotted rotors, cooling upgrades, suspension upgrades, summer tires on 10-spoke wheels, etc. Heavier but more track-ready.
But it would be really great if the C7s are so damn fast that they can do 0-60 in under 4 seconds even WITH a shift...
.
The new 7-speed trans is likely to have new gear ratios, not just another gear added to one of the 6-speeds.
A 7-speed manual trans with evenly spaced rarios sounds like a great idea, no more big rpm drop to the tall overdrive ratio. Initially I was envisioning an aggressive overall ratio in 1st gear like the C5Z06/C6Z51/C6GS, which is a lot of fun. But that would require a 1-2 shift before 60, increasing 0-60 times. They're claiming the base C7 will do 0-60 in under 4 seconds.
As with the LS7 and LS9, they might use tall gearing to allow the C7 to reach 60 in first, no 1-2 shift to hurt the all-important 0-60 bragging rights.
Assuming tire diameters remain about the same and with the 6600 rpm redline, the overall ratio in 1st would need to be around 8:00 to 1 or less to do 60 in 1st. If a 3:42 axle was used this would require a first gear ratio like the ZR1's 2:29 or 2:23.
Gearing like this doesn't sound like much fun for those of us who like to shift but the car would really be plenty quick with 50 ft/lb more torque and a couple hundred less pounds to pull.
The best solution might be to equip the light base car with tall gears for the best advertised 0-60 time and EPA numbers. The optional performance package (Z51?) could include better gearing in addition to dry sump, big brakes with slotted rotors, cooling upgrades, suspension upgrades, summer tires on 10-spoke wheels, etc. Heavier but more track-ready.
But it would be really great if the C7s are so damn fast that they can do 0-60 in under 4 seconds even WITH a shift...
.
Last edited by ZL-1; 10-26-2012 at 11:52 PM.
10-27-2012, 03:32 AM
#14
Team Owner
It's premature to hope for a certain axle ratio without yet knowing the transmission's gear ratios, it's only half the equasion.
The new 7-speed trans is likely to have new gear ratios, not just another gear added to one of the 6-speeds.
A 7-speed manual trans with evenly spaced rarios sounds like a great idea, no more big rpm drop to the tall overdrive ratio. Initially I was envisioning an aggressive overall ratio in 1st gear like the C5Z06/C6Z51/C6GS, which is a lot of fun. But that would require a 1-2 shift before 60, increasing 0-60 times. They're claiming the base C7 will do 0-60 in under 4 seconds.
As with the LS7 and LS9, they might use tall gearing to allow the C7 to reach 60 in first, no 1-2 shift to hurt the all-important 0-60 bragging rights.
Assuming tire diameters remain about the same and with the 6600 rpm redline, the overall ratio in 1st would need to be around 8:00 to 1 or less to do 60 in 1st. If a 3:42 axle was used this would require a first gear ratio like the ZR1's 2:29 or 2:23.
Gearing like this doesn't sound like much fun for those of us who like to shift but the car would really be plenty quick with 50 ft/lb more torque and a couple hundred less pounds to pull.
The best solution might be to equip the light base car with tall gears for the best advertised 0-60 time and EPA numbers. The optional performance package (Z51?) could include better gearing in addition to dry sump, big brakes with slotted rotors, cooling upgrades, suspension upgrades, summer tires on 10-spoke wheels, etc. Heavier but more track-ready.
But it would be really great if the C7s are so damn fast that they can do 0-60 in under 4 seconds even WITH a shift....
The new 7-speed trans is likely to have new gear ratios, not just another gear added to one of the 6-speeds.
A 7-speed manual trans with evenly spaced rarios sounds like a great idea, no more big rpm drop to the tall overdrive ratio. Initially I was envisioning an aggressive overall ratio in 1st gear like the C5Z06/C6Z51/C6GS, which is a lot of fun. But that would require a 1-2 shift before 60, increasing 0-60 times. They're claiming the base C7 will do 0-60 in under 4 seconds.
As with the LS7 and LS9, they might use tall gearing to allow the C7 to reach 60 in first, no 1-2 shift to hurt the all-important 0-60 bragging rights.
Assuming tire diameters remain about the same and with the 6600 rpm redline, the overall ratio in 1st would need to be around 8:00 to 1 or less to do 60 in 1st. If a 3:42 axle was used this would require a first gear ratio like the ZR1's 2:29 or 2:23.
Gearing like this doesn't sound like much fun for those of us who like to shift but the car would really be plenty quick with 50 ft/lb more torque and a couple hundred less pounds to pull.
The best solution might be to equip the light base car with tall gears for the best advertised 0-60 time and EPA numbers. The optional performance package (Z51?) could include better gearing in addition to dry sump, big brakes with slotted rotors, cooling upgrades, suspension upgrades, summer tires on 10-spoke wheels, etc. Heavier but more track-ready.
But it would be really great if the C7s are so damn fast that they can do 0-60 in under 4 seconds even WITH a shift....
10-27-2012, 08:59 AM
#15
Melting Slicks
Member Since: Nov 2000
Location: Merritt Island Florida
Posts: 2,225
Received 241 Likes
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145 Posts
It's premature to hope for a certain axle ratio without yet knowing the transmission's gear ratios, it's only half the equasion.
The new 7-speed trans is likely to have new gear ratios, not just another gear added to one of the 6-speeds.
A 7-speed manual trans with evenly spaced rarios sounds like a great idea, no more big rpm drop to the tall overdrive ratio. Initially I was envisioning an aggressive overall ratio in 1st gear like the C5Z06/C6Z51/C6GS, which is a lot of fun. But that would require a 1-2 shift before 60, increasing 0-60 times. They're claiming the base C7 will do 0-60 in under 4 seconds.
As with the LS7 and LS9, they might use tall gearing to allow the C7 to reach 60 in first, no 1-2 shift to hurt the all-important 0-60 bragging rights.
Assuming tire diameters remain about the same and with the 6600 rpm redline, the overall ratio in 1st would need to be around 8:00 to 1 or less to do 60 in 1st. If a 3:42 axle was used this would require a first gear ratio like the ZR1's 2:29 or 2:23.
Gearing like this doesn't sound like much fun for those of us who like to shift but the car would really be plenty quick with 50 ft/lb more torque and a couple hundred less pounds to pull.
The best solution might be to equip the light base car with tall gears for the best advertised 0-60 time and EPA numbers. The optional performance package (Z51?) could include better gearing in addition to dry sump, big brakes with slotted rotors, cooling upgrades, suspension upgrades, summer tires on 10-spoke wheels, etc. Heavier but more track-ready.
But it would be really great if the C7s are so damn fast that they can do 0-60 in under 4 seconds even WITH a shift...
.
The new 7-speed trans is likely to have new gear ratios, not just another gear added to one of the 6-speeds.
A 7-speed manual trans with evenly spaced rarios sounds like a great idea, no more big rpm drop to the tall overdrive ratio. Initially I was envisioning an aggressive overall ratio in 1st gear like the C5Z06/C6Z51/C6GS, which is a lot of fun. But that would require a 1-2 shift before 60, increasing 0-60 times. They're claiming the base C7 will do 0-60 in under 4 seconds.
As with the LS7 and LS9, they might use tall gearing to allow the C7 to reach 60 in first, no 1-2 shift to hurt the all-important 0-60 bragging rights.
Assuming tire diameters remain about the same and with the 6600 rpm redline, the overall ratio in 1st would need to be around 8:00 to 1 or less to do 60 in 1st. If a 3:42 axle was used this would require a first gear ratio like the ZR1's 2:29 or 2:23.
Gearing like this doesn't sound like much fun for those of us who like to shift but the car would really be plenty quick with 50 ft/lb more torque and a couple hundred less pounds to pull.
The best solution might be to equip the light base car with tall gears for the best advertised 0-60 time and EPA numbers. The optional performance package (Z51?) could include better gearing in addition to dry sump, big brakes with slotted rotors, cooling upgrades, suspension upgrades, summer tires on 10-spoke wheels, etc. Heavier but more track-ready.
But it would be really great if the C7s are so damn fast that they can do 0-60 in under 4 seconds even WITH a shift...
.
imagine a real engine, lighter car and shifts that is 60 ms
10-27-2012, 11:18 AM
#16
Team Owner
It's premature to hope for a certain axle ratio without yet knowing the transmission's gear ratios, it's only half the equasion.
The new 7-speed trans is likely to have new gear ratios, not just another gear added to one of the 6-speeds.
A 7-speed manual trans with evenly spaced rarios sounds like a great idea, no more big rpm drop to the tall overdrive ratio. Initially I was envisioning an aggressive overall ratio in 1st gear like the C5Z06/C6Z51/C6GS, which is a lot of fun. But that would require a 1-2 shift before 60, increasing 0-60 times. They're claiming the base C7 will do 0-60 in under 4 seconds.
As with the LS7 and LS9, they might use tall gearing to allow the C7 to reach 60 in first, no 1-2 shift to hurt the all-important 0-60 bragging rights.
Assuming tire diameters remain about the same and with the 6600 rpm redline, the overall ratio in 1st would need to be around 8:00 to 1 or less to do 60 in 1st. If a 3:42 axle was used this would require a first gear ratio like the ZR1's 2:29 or 2:23.
Gearing like this doesn't sound like much fun for those of us who like to shift but the car would really be plenty quick with 50 ft/lb more torque and a couple hundred less pounds to pull.
The best solution might be to equip the light base car with tall gears for the best advertised 0-60 time and EPA numbers. The optional performance package (Z51?) could include better gearing in addition to dry sump, big brakes with slotted rotors, cooling upgrades, suspension upgrades, summer tires on 10-spoke wheels, etc. Heavier but more track-ready.
But it would be really great if the C7s are so damn fast that they can do 0-60 in under 4 seconds even WITH a shift...
.
The new 7-speed trans is likely to have new gear ratios, not just another gear added to one of the 6-speeds.
A 7-speed manual trans with evenly spaced rarios sounds like a great idea, no more big rpm drop to the tall overdrive ratio. Initially I was envisioning an aggressive overall ratio in 1st gear like the C5Z06/C6Z51/C6GS, which is a lot of fun. But that would require a 1-2 shift before 60, increasing 0-60 times. They're claiming the base C7 will do 0-60 in under 4 seconds.
As with the LS7 and LS9, they might use tall gearing to allow the C7 to reach 60 in first, no 1-2 shift to hurt the all-important 0-60 bragging rights.
Assuming tire diameters remain about the same and with the 6600 rpm redline, the overall ratio in 1st would need to be around 8:00 to 1 or less to do 60 in 1st. If a 3:42 axle was used this would require a first gear ratio like the ZR1's 2:29 or 2:23.
Gearing like this doesn't sound like much fun for those of us who like to shift but the car would really be plenty quick with 50 ft/lb more torque and a couple hundred less pounds to pull.
The best solution might be to equip the light base car with tall gears for the best advertised 0-60 time and EPA numbers. The optional performance package (Z51?) could include better gearing in addition to dry sump, big brakes with slotted rotors, cooling upgrades, suspension upgrades, summer tires on 10-spoke wheels, etc. Heavier but more track-ready.
But it would be really great if the C7s are so damn fast that they can do 0-60 in under 4 seconds even WITH a shift...
.
The current C6 GS will do 0-60 in 3.95 seconds and requires upshifting at 50.8 MPH(6500 RPM). No reason a 150 pound lighter car(base C7), with an increase 50 lbs-ft of torque down low and 14 more horsepower, and an extra 100 RPM, can't do 0-60 below 4 seconds including the time to shift gears.
In addition, with my transmission/axle ratios, the 1X4 CAGS becomes more usable. Currently, if you shift at 2,000 RPM(17.8 MPH) to 4th gear the RPM drops to 750 RPM. With my ratios, when you shift to 4th gear at 2,000, the RPM only drops to 875 RPM. With the current C6, once you shift to 4th you end up trying to accelerate and only have a 3.42 gear. With my gearing, you would have a 3.90 gear, which will help the car accelerate easier without lugging the engine.
Last edited by JoesC5; 10-27-2012 at 11:56 AM.
10-27-2012, 10:30 PM
#17
Safety Car
reread my post on what transmission/axle ratios I would like to see.
The current C6 GS will do 0-60 in 3.95 seconds and requires upshifting at 50.8 MPH(6500 RPM). No reason a 150 pound lighter car(base C7), with an increase 50 lbs-ft of torque down low and 14 more horsepower, and an extra 100 RPM, can't do 0-60 below 4 seconds including the time to shift gears.
In addition, with my transmission/axle ratios, the 1X4 CAGS becomes more usable. Currently, if you shift at 2,000 RPM(17.8 MPH) to 4th gear the RPM drops to 750 RPM. With my ratios, when you shift to 4th gear at 2,000, the RPM only drops to 875 RPM. With the current C6, once you shift to 4th you end up trying to accelerate and only have a 3.42 gear. With my gearing, you would have a 3.90 gear, which will help the car accelerate easier without lugging the engine.
The current C6 GS will do 0-60 in 3.95 seconds and requires upshifting at 50.8 MPH(6500 RPM). No reason a 150 pound lighter car(base C7), with an increase 50 lbs-ft of torque down low and 14 more horsepower, and an extra 100 RPM, can't do 0-60 below 4 seconds including the time to shift gears.
In addition, with my transmission/axle ratios, the 1X4 CAGS becomes more usable. Currently, if you shift at 2,000 RPM(17.8 MPH) to 4th gear the RPM drops to 750 RPM. With my ratios, when you shift to 4th gear at 2,000, the RPM only drops to 875 RPM. With the current C6, once you shift to 4th you end up trying to accelerate and only have a 3.42 gear. With my gearing, you would have a 3.90 gear, which will help the car accelerate easier without lugging the engine.
.
Last edited by ZL-1; 10-27-2012 at 10:38 PM.
10-27-2012, 10:35 PM
#18
Safety Car
It would be so great if the 2014 C7 offered a DCT to reduce acceleration times. But we already know it won't. So we're just discussing the ratios of the 2014 C7's 7-speed manual now. (yes I drove a 458; it's fantastic)
10-27-2012, 10:55 PM
#19
In the first 36 years of my driving career I owned exclusively manual transmission cars. Those included a couple of first generation Camaros and a new 1985 Corvette. The thought of buying an automatic in that '85 Corvette was as foreign to my thinking at that time as it is to some of you today. HOWEVER, I believe that I always considered the shifting to be a means to an end. The end was to get where I was going as quickly as the vehicle would allow, regardless of the shift points. Isn't that what you all are thinking now? Considering the horse power and torque of the LT1 as well as the limitation on rear tire size why would you want gears lower than in a C6 in first, second, and possibly third gears?
10-28-2012, 12:11 AM
#20
Team Owner
