Lutz: GM mulls 4-cylinder engine for new Camaro
#136
#137
The number of gear ratios is entirely irrelevant.
As far as gear ratios are concerned, fuel economy is based on the ratio of your lowest gear. In the case of the T56 ratios, they took the ratios a normal five-speed with a single overdrive and added a sixth ratio, even lower than the existing 5th gear overdrive.
In the case of most other six-speeds, they make the ratios closer together, and sixth gear is just a regular overdrive, not a super-low overdrive like on the T56.
As far as gear ratios are concerned, fuel economy is based on the ratio of your lowest gear. In the case of the T56 ratios, they took the ratios a normal five-speed with a single overdrive and added a sixth ratio, even lower than the existing 5th gear overdrive.
In the case of most other six-speeds, they make the ratios closer together, and sixth gear is just a regular overdrive, not a super-low overdrive like on the T56.
#141
Still, the TSX's 6th gear is 0.659:1, while the T56's is .500:1. My original point was that the number of gears (and the number of overdrives) is irrelevant. The only thing that's going to have a bearing on fuel economy is how low the lowest ratio is. I've never seen any other transmission come close to 0.5:1, except for a couple of CVTs.
#143
I looked up and confirmed the TSX, but I'm taking your word for it on the rest.
Still, the TSX's 6th gear is 0.659:1, while the T56's is .500:1. My original point was that the number of gears (and the number of overdrives) is irrelevant. The only thing that's going to have a bearing on fuel economy is how low the lowest ratio is. I've never seen any other transmission come close to 0.5:1, except for a couple of CVTs.
Still, the TSX's 6th gear is 0.659:1, while the T56's is .500:1. My original point was that the number of gears (and the number of overdrives) is irrelevant. The only thing that's going to have a bearing on fuel economy is how low the lowest ratio is. I've never seen any other transmission come close to 0.5:1, except for a couple of CVTs.
#144
None of this is a matter of need. Cars work fine with two (automatic) or three (manual) gear ratios. Anything more than that is just to improve economy, performance, and/or ratio selection.
Long story short: the Camaro will be driven on the road -- not just at the drag strip, where you go WOT to redline, shift, and repeat.
#145
I looked up and confirmed the TSX, but I'm taking your word for it on the rest.
Still, the TSX's 6th gear is 0.659:1, while the T56's is .500:1. My original point was that the number of gears (and the number of overdrives) is irrelevant. The only thing that's going to have a bearing on fuel economy is how low the lowest ratio is. I've never seen any other transmission come close to 0.5:1, except for a couple of CVTs.
Still, the TSX's 6th gear is 0.659:1, while the T56's is .500:1. My original point was that the number of gears (and the number of overdrives) is irrelevant. The only thing that's going to have a bearing on fuel economy is how low the lowest ratio is. I've never seen any other transmission come close to 0.5:1, except for a couple of CVTs.
Interestingly, the 3650 5-speed that comes in the Mustang has a .67 5th gear, while the 03/04 Mach 1 version had a .62 5th gear.
Point: Gears vary.
#146
The T56 comes in different versions, so there are different ODs depending upon the version. The T56 in the F-body (and Viper) had a .50 6th gear. However, the T56 in the 03/04 Cobra had a .62 6th gear, as did the Z06. The GTO had a .57 6th gear.
Interestingly, the 3650 5-speed that comes in the Mustang has a .67 5th gear, while the 03/04 Mach 1 version had a .62 5th gear.
Point: Gears vary.
Interestingly, the 3650 5-speed that comes in the Mustang has a .67 5th gear, while the 03/04 Mach 1 version had a .62 5th gear.
Point: Gears vary.
#147
Agreed.
Are you seriously advocating for fewer gear ratios in the 5th gen than we had in the 4th gen?
Transmission gear ratios should provide a wide spread of options, with the highest ratios providing good acceleration from a stop without bogging the engine or feathering the clutch, and the lowest ratios providing good fuel economy at highway speeds. The gear ratios should be spaced so that the engine's powerband can be utilized at any speed the, with a consistent spacing between each gear.
To suggest that a 0.62:1 ratio is somehow more versatile than a 0.5:1 ratio (or any other ratio, for that matter) is absurd. A single ratio, by itself, has no versatility. The breadth of ratios in a transmission is what provides versatility.
It's not that I don't see your point. It's that your point is ridiculous. Can you imagine how much flack Camaro would take if it had the same ratios the 4th gen T56 had, except without 5th gear?
Transmission gear ratios should provide a wide spread of options, with the highest ratios providing good acceleration from a stop without bogging the engine or feathering the clutch, and the lowest ratios providing good fuel economy at highway speeds. The gear ratios should be spaced so that the engine's powerband can be utilized at any speed the, with a consistent spacing between each gear.
To suggest that a 0.62:1 ratio is somehow more versatile than a 0.5:1 ratio (or any other ratio, for that matter) is absurd. A single ratio, by itself, has no versatility. The breadth of ratios in a transmission is what provides versatility.
It's not that I don't see your point. It's that your point is ridiculous. Can you imagine how much flack Camaro would take if it had the same ratios the 4th gen T56 had, except without 5th gear?
#149
Agreed.
Are you seriously advocating for fewer gear ratios in the 5th gen than we had in the 4th gen?
Transmission gear ratios should provide a wide spread of options, with the highest ratios providing good acceleration from a stop without bogging the engine or feathering the clutch, and the lowest ratios providing good fuel economy at highway speeds. The gear ratios should be spaced so that the engine's powerband can be utilized at any speed the, with a consistent spacing between each gear.
To suggest that a 0.62:1 ratio is somehow more versatile than a 0.5:1 ratio (or any other ratio, for that matter) is absurd. A single ratio, by itself, has no versatility. The breadth of ratios in a transmission is what provides versatility.
It's not that I don't see your point. It's that your point is ridiculous. Can you imagine how much flack Camaro would take if it had the same ratios the 4th gen T56 had, except without 5th gear?
Are you seriously advocating for fewer gear ratios in the 5th gen than we had in the 4th gen?
Transmission gear ratios should provide a wide spread of options, with the highest ratios providing good acceleration from a stop without bogging the engine or feathering the clutch, and the lowest ratios providing good fuel economy at highway speeds. The gear ratios should be spaced so that the engine's powerband can be utilized at any speed the, with a consistent spacing between each gear.
To suggest that a 0.62:1 ratio is somehow more versatile than a 0.5:1 ratio (or any other ratio, for that matter) is absurd. A single ratio, by itself, has no versatility. The breadth of ratios in a transmission is what provides versatility.
It's not that I don't see your point. It's that your point is ridiculous. Can you imagine how much flack Camaro would take if it had the same ratios the 4th gen T56 had, except without 5th gear?
and this arguement is about the v6. a base v6 does not need a 6 speed or the hype/cost that goes along with it.
#150
i know there are others, the svt focus comes to mind. but 6 speeds with 2 overdrives outnumber those that only have 1. for the most part, 6 speeds arent for performance, they are for fuel efficiency.