C7 Gear Swap
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Pro
Joined: Oct 2008
Posts: 564
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From: Houston TX
C7 Gear Swap
It seems noone has come up with gear swap options for the C7. It was mentioned to me by Texas Speed that ring/pinion sets from a C6 might work...anybody tried that? Top of 4th and 5th gear in these cars suck, and would like to put a bit taller gear in it...lol
Burning Brakes
Joined: Apr 2003
Posts: 908
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From: TROY MI
A 3.42 Gear in a C7 A6 would really wake this car up and give it better gearing for the entire 1/4 mile. I know the drop between gears is more than the A8 but the increased gearing would bring the revs up a lot quicker.
I ran a 3.73 in mu C5 A4 and it was a beast.
I ran a 3.73 in mu C5 A4 and it was a beast.
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We are working on it with Motive. I have already sent all the parts needed for a rebuild. Not as easy as just get it done though, someone is paying close to 100k for tooling, and that is just for one ratio. The C6 gears will not work, the pinion is too short compared to the C7. I really wanted to get a 3.15 for the A6 cars. I may build a custom housing so that a C6 gear set would work, but it is not in the works as of right now.
Melting Slicks
Joined: Nov 2013
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From: Texas
Though small, I’d have liked to have the option of the Z51 2.73 ratio in my base model A6. It has been certified, shouldn’t be a big deal but you can’t do it. Don
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Pro
Joined: Oct 2008
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From: Houston TX
Of course it is better after a couple years...first generation cars like this C7 have very few options. In a year, or so there will be plenty of options available for the C7. I, bit on this one, and got one of the first ones out...now, I am impatient as have maxed out the car without going crazy, and tearing apart the motor.
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From: Houston TX
Glad you guys are working on it, and I realize the front end is expensive...however, people in this space are innovators, and being first on the market with something like this is big, especially when the car has big issues in 4th, and 5th gear.
Pro
Joined: Nov 2013
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Well I have a Z51 which at the road course its fine.. but the gears suck at the drag strip.. 2nd way too short and 3rd too short.. at 105mph you shift into 4th that goes to 153mph
so at 105mph car falls on its face lol
I want the Z06 gears .. first a lil wide but 2nd and 3rd help the quarter and wont hurt the road course much expect for add a shift or two
so at 105mph car falls on its face lol
I want the Z06 gears .. first a lil wide but 2nd and 3rd help the quarter and wont hurt the road course much expect for add a shift or two
Thread Starter
Pro
Joined: Oct 2008
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From: Houston TX
I don't have a problem in the 1/4...car is pretty strong. As it sits I trap around 135-136. My problem is 150+ when I run at The Texas Mile. once I get to about 5k in 4th gear it sucks from then on...so, am hoping a 3.73 gear will hlp me overcome the gear issue up top. With the power it is making it should be ding better...also did some research and the C7 is not very competitive when you look at high speed aero indexes...even a most recent GTO has better drag ratios...the C5 was the most aero vette ever made.
Le Mans Master
Joined: Jul 2005
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Different rear end gears will not do anything for the RPM drop between gears, especially the 3rd-4th and 4th-5th shifts...the Achilles heel of the Z51 M7 transmission. That transmission is meant more for autocrossing, not road racing/drag racing/one mile racing. A set of 4.10 or 4.56 gears with the C7 Z06 transmission is the solution you're looking for. A 4.88 gear would be even better.