Any updates. 
C6A6 rearend ratio?
Le Mans Master
Joined: Feb 2006
Posts: 5,762
Likes: 4
From: Chandler Arizona
Do a search and you'll find the 2.56 is very misleading. First 4 gears are under-driven. 3rd gear is 1.53 instead of 1.00. The 2.56 is equivalent to having a 3.92 rearend with an A4 for the quarter mile.
Safety Car
Joined: Jan 2006
Posts: 4,598
Likes: 78
From: Miami FL
2020 C6 of the Year Finalist - Unmodified
St. Jude Donor '08-'09-'10-'11-'12-'13-'14-'15-'16,'17,'18-'19-'20-'21-'22
Not to mention the torque converter, which acts like an additional 2:1 reduction gear.
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Le Mans Master
Joined: Sep 2004
Posts: 7,027
Likes: 6
From: Shiloh Ohio
You know mathematically you guys are probably right. But an A4 with a 3.90 rear end would smoke our A6's in the qtr mile. I think a 3.42 would really add some punch to the A6. At least a 3.15.
Nothing wrong with the 2.56, but I drag race a lot and I just want a little more grrrr out of the hole.
Nothing wrong with the 2.56, but I drag race a lot and I just want a little more grrrr out of the hole.
Team Owner
Joined: Feb 2001
Posts: 27,254
Likes: 136
From: Short Hills, NJ
Originally Posted by shurite44
You know mathematically you guys are probably right. But an A4 with a 3.90 rear end would smoke our A6's in the qtr mile.
If the A6 (with 2.56s) is truly the equivalant to having an A4 with 3.90s then there would never be any need to upgrade the gears in a modified higher rev situation such as an aggressive heads and cam package, just a converter swap and go, is that possible?
Le Mans Master
Joined: Feb 2006
Posts: 5,762
Likes: 4
From: Chandler Arizona
Originally Posted by LS1LT1
If the A6 (with 2.56s) is truly the equivalant to having an A4 with 3.90s then there would never be any need to upgrade the gears in a modified higher rev situation such as an aggressive heads and cam package, just a converter swap and go, is that possible?I think where most people get confused is that most A4's with stiffer gears ALSO have a 3200 to 3600 stall converter. That is worth at least .2 to .3 in the quarter. That's the only reason they would spank the A6.
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Le Mans Master
Joined: Feb 2006
Posts: 5,762
Likes: 4
From: Chandler Arizona
Originally Posted by shurite44
Well I don't have any data but I still think an A4 with a stock TC and 3.90's would spank our A6's stock.
So I respectfully disagree.
So I respectfully disagree.
OK, we can disagree. However, I'd love to hear the reasons. I'll give you one that might be true: The A4 is lighter than the A6. Spank? Well, no, but it would probably win based on lower weight if it had the 3.90's.
I find it interesting that people who have the A4 are always trying to figure out why it's better than the A6. Probably because they are pissed that they didn't get the A6. Don't get me wrong. If I had an A4, I'd be pissed and trying to figure out why it was really better than the A6.
Other than weight, the A6 is a great tranny. It gives you a tranny that has great low gears, but it gives you that 6th gear like the manual. I can drive at 70 mph at only 1500 rpm.
Le Mans Master
Joined: Feb 2006
Posts: 5,762
Likes: 4
From: Chandler Arizona
Originally Posted by shurite44
I have an A6 you silly goose.
Le Mans Master
Joined: Feb 2006
Posts: 5,762
Likes: 4
From: Chandler Arizona
Originally Posted by shurite44
I have looked at the chart and I think they are correct about the A6 gear. It is very low, but it don't run like it. I bet our 60's are no better on average than the A4 with the 3.15.
Le Mans Master
Joined: Sep 2004
Posts: 7,027
Likes: 6
From: Shiloh Ohio
Originally Posted by glennhl
Sorry, I knew that. I lost my memory, just can't remember where I left it. However, I still get a kick out of the A4 people saying it's a better tranny. It is light, but man, the A6 rocks. The reason people think it's not fast enough is called TORQUE MANAGEMENT!
You could be right about the TM. Maybe it is so high with the A6 due to the lower gear. Might be the reason it is set this way.
Le Mans Master
Joined: Sep 2004
Posts: 7,027
Likes: 6
From: Shiloh Ohio
Originally Posted by glennhl
Sorry, I knew that. I lost my memory, just can't remember where I left it.
Le Mans Master
Joined: Feb 2006
Posts: 5,762
Likes: 4
From: Chandler Arizona
Originally Posted by TMyers
Nope I'm betting that 1st and 2nd on the A4 with 3.90's would be lower would be lower than the A6 stock. No where is that damn gear chart. It should really be made a sticky.
Here's the gear chart:
..GEAR......Mode..or..Option
............Z06...Std_6-spd...Z51_6-spd...6-spd_Auto...4-spd_Auto
..1st.......2.66....2.66........2.97.... .....4.02........3.06
..2nd.......1.78....1.78........2.07.... .....2.36........1.63
..3rd.......1.30....1.30........1.43.... .....1.53........1.00
..4th.......1.00....1.00........1.00.... .....1.15........0.70
..5th.......0.74....0.74........0.71.... .....0.85
..6th.......0.50....0.50........0.57.... .....0.67
Reverse.....2.90....2.90........3.28.... .....3.06........2.29
Axle Ratio..3.42....3.42........3.42......... 2.56.....2.73(or_3.15)
So A6 1,2,3 = 10.29, 6.04, 3.92
A4 1,2,3 with 3.90's = 11.93, 6.36, 3.90
So you are absolutely correct, the A4 with 3.90's is steeper in first and second.
However, most guys don't go with more than 3.73's with the A4, that gives: 11.41, 6.08, 3.73
So even the 3.73's gives you a deeper first and second gear.
I would like to do 3.42's with the A6 and run it through the quarter mile like a 4 speed. Fourth would be 3.42 x 1.15 = 3.93. Only trouble is first gear would be a real stump puller at 13.75 which would require some seriously sticky tires.