Gear Question
Thread Starter
Pro
Joined: Mar 2005
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From: Kansas City Missouri
Gear Question
On the C7 order form I see a 2.73 ratio and a 2.56 ratio with the 3.42 being the standard. I intend to order a C7 Convertible Z51, I don't plan to track the car or do Top End racing. I want the best all around performance and gas mileage. What is the difference and which one should I choose?
Safety Car
Joined: Sep 2011
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From: Cary NC
That is not something you can order. They are the result of other choices.
All manual transmissions are 3.42. Automatics are either 2.46 or 2.73 depending on whether you choose the Z51 option or not. Since you are ordering Z51, you will get 3,42 if a manual, 2.73 if an automatic.
All manual transmissions are 3.42. Automatics are either 2.46 or 2.73 depending on whether you choose the Z51 option or not. Since you are ordering Z51, you will get 3,42 if a manual, 2.73 if an automatic.
Le Mans Master
Joined: Sep 2004
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From: Los Angeles
The final drive ratio will definitely improve mileage but it will be at the expense of overall performance. The meaningless 0-60 will be slower and the 1/4 mile will suffer in both top speed and E.T. However, the improvements in mileage will mostly only be realized on the highway. So if you do many road trips, it will definitely save gas. Otherwise, not so much.
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On the C7 order form I see a 2.73 ratio and a 2.56 ratio with the 3.42 being the standard. I intend to order a C7 Convertible Z51, I don't plan to track the car or do Top End racing. I want the best all around performance and gas mileage. What is the difference and which one should I choose?
If you are ordering an automatic transmission with the Z51 your only choice will be 2.73.
If you are ordering an automatic transmission without the Z51 package your only choice will be the 2.56.
Safety Car
Joined: Nov 2002
Posts: 4,168
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From: FLL Florida
The final drive ratio will definitely improve mileage but it will be at the expense of overall performance. The meaningless 0-60 will be slower and the 1/4 mile will suffer in both top speed and E.T. However, the improvements in mileage will mostly only be realized on the highway. So if you do many road trips, it will definitely save gas. Otherwise, not so much.
Le Mans Master
Joined: Sep 2004
Posts: 5,707
Likes: 4
From: Los Angeles
If you are ordering a manual transmission car, your only choice will be a 3.42 ratio.
If you are ordering an automatic transmission with the Z51 your only choice will be 2.73.
If you are ordering an automatic transmission without the Z51 package your only choice will be the 2.56.
If you are ordering an automatic transmission with the Z51 your only choice will be 2.73.
If you are ordering an automatic transmission without the Z51 package your only choice will be the 2.56.
Le Mans Master
Joined: Sep 2004
Posts: 5,707
Likes: 4
From: Los Angeles
Correct. A lot of guys run 4:11 gears in their Vettes but often switch back to 3:42 because they have to use the over drive gears which requires more gear changes, taller overall ratios and slower lap times. The higher the ratio, the higher the temperatures also. Tire wear increases as do carrier clutches. The properties of the rear axle are second only to tires for performance.
Safety Car
Joined: Nov 2002
Posts: 4,168
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From: FLL Florida
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Safety Car
Joined: Nov 2002
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From: FLL Florida
If it only gets torque and traction signals, I don't think it would have to be reprogrammed with a pinion and crown wheel change. I would like to see a lot of tech data released on the C7 such as this but anything electronic is usually closely guarded. I think it is simply active locally unlike f1 and rally cars. I wonder if a F458 or a GT3 ediff gets info from its DCT?