performance axle ratio
Thread Starter
Racer
Joined: May 2006
Posts: 376
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From: Suburbs of New Orleans La
performance axle ratio
In the order guide I see a performance axle ratio available for auto trans Z51 cars.
GU2 Rear axle, 2.73 ratio, limited-slip, performance
However, every price list I have seen does not show this option. I have it on my A6 2008 and do feel it gives a little bump in acceleration.
Any clues?
GU2 Rear axle, 2.73 ratio, limited-slip, performance
However, every price list I have seen does not show this option. I have it on my A6 2008 and do feel it gives a little bump in acceleration.
Any clues?
Race Director
Joined: Dec 2011
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Watching a program on Velocity Channel right now and a guy who was recently inducted into the 200 mph Club at Bonneville said there are less people in that club than have climbed Mount Everest. And to think that we have most of those people as members right here at CF
Team Owner
Joined: Sep 1999
Posts: 41,732
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From: Springfield MO
But you can only go 185 mph at Bonneville instead of 190 Watching a program on Velocity Channel right now and a guy who was recently inducted into the 200 mph Club at Bonneville said there are less people in that club than have climbed Mount Everest. And to think that we have most of those people as members right here at CF
Watching a program on Velocity Channel right now and a guy who was recently inducted into the 200 mph Club at Bonneville said there are less people in that club than have climbed Mount Everest. And to think that we have most of those people as members right here at CF Of course, the straight away at the local Sonic will have to be pretty long to see that speed.
Safety Car
Joined: Apr 2007
Posts: 4,548
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From: Southeast, WI
But you can only go 185 mph at Bonneville instead of 190 Watching a program on Velocity Channel right now and a guy who was recently inducted into the 200 mph Club at Bonneville said there are less people in that club than have climbed Mount Everest. And to think that we have most of those people as members right here at CF
Watching a program on Velocity Channel right now and a guy who was recently inducted into the 200 mph Club at Bonneville said there are less people in that club than have climbed Mount Everest. And to think that we have most of those people as members right here at CF
Race Director
Joined: Dec 2011
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Others say they have experienced otherwise, but at over 165 mph (not at Bonneville) I felt the slightest "float" sensation in mine and lifted immediately. First time I had ever felt that so maybe it is something high speed drivers get used to or maybe I encountered a very slight breeze of some sort.
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Team Owner
Joined: Sep 1999
Posts: 41,732
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From: Springfield MO
Not me. Have you seen the salt build up on the cars after they do a run?
I would like to run the 8 mile high banked oval track in Ohio. Coming out of the corner at 160 and then having close to two miles to accelerate down the straights, hitting 198 MPH, before braking to go though the next corner at 160 MPH.
I would like to run the 8 mile high banked oval track in Ohio. Coming out of the corner at 160 and then having close to two miles to accelerate down the straights, hitting 198 MPH, before braking to go though the next corner at 160 MPH.
Team Owner
Joined: Sep 2000
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From: Far NW 'burbs of Chicago
St. Jude Donor '13
The performance axle should produce a slightly higher top speed, because it lets the engine rev a little closer to its HP peak.
But the difference will be small.
But the difference will be small.
Race Director
Joined: Jun 2001
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From: CA
Team Owner
Joined: Sep 1999
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From: Springfield MO
It takes the Z06 some 75 horsepower to increase it's speed from 190 to 198 MPH. It takes the ZR1 some 133 HP to increase it's speed from 198 to 205.
Team Owner
Joined: Sep 2000
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From: Far NW 'burbs of Chicago
St. Jude Donor '13
It does take a lot of HP to get higher top speed, but the Z06/ZR1 have a lot of aero changes to improve handling but they also increase drag.
When the base C6 went from 400 to 430 hp, I believe GM said the top speed increased from 185 to 190.
When the base C6 went from 400 to 430 hp, I believe GM said the top speed increased from 185 to 190.
Team Owner
Joined: Sep 1999
Posts: 41,732
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From: Springfield MO
Yep. the 2005 was 186 MPH(that magical 300Kph in Europe) and the 2008 was 190 MPH according to GM's press releases. 4 MPH increase required 30 additional horsepower.
Thread Starter
Racer
Joined: May 2006
Posts: 376
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From: Suburbs of New Orleans La
To Clarify
I do not care about 185 as opposed to 190 or starting the salt corrosion process while on the salt flats at Bonneville.
I was asking the question because the 2.73 rear will provide marginally (and I know that it is marginal) better 0-60 and 1/4mile numbers than the standard 2.56.
Thanks to Bill17601 for actually answering the question asked.
I was asking the question because the 2.73 rear will provide marginally (and I know that it is marginal) better 0-60 and 1/4mile numbers than the standard 2.56.
Thanks to Bill17601 for actually answering the question asked.
Race Director
Joined: Mar 2011
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From: SW Florida
2021 C6 of the Year Finalist - Modified
I believe buying the C7/Z51 with the A6 trans will be the same as buying a C6 GS with the A6 trans:
The C6 Base / A6 has a 2.56 axle ... The C6 GS / A6 has a 2.73 axle
The C7 Base / A6 has a 2.56 axle ... The C7 Z51 / A6 has a 2.73 axle
In fact, here are the extras that come with the C7 Z51 when ordered with the A6 transmission:
Q7S Split-Spoke Silver Painted Aluminum Wheels, 19” x 8.5” (front), 20” x 10” (rear)
Michelin Pilot Super Sport ZP Tires, P245/ 35ZR-19” (front), P285/ 30ZR-20” (rear)
Brembo Performance Brakes w/ Black Calipers
Performance Suspension
Dry Sump Oil System
Electronic Limited Slip Differential w/ 2.73 Performance Axle Ratio
Differential Oil Cooler
Unique Full-Width Rear Spoiler
___________________________________
.
The C6 Base / A6 has a 2.56 axle ... The C6 GS / A6 has a 2.73 axle
The C7 Base / A6 has a 2.56 axle ... The C7 Z51 / A6 has a 2.73 axle
In fact, here are the extras that come with the C7 Z51 when ordered with the A6 transmission:
Q7S Split-Spoke Silver Painted Aluminum Wheels, 19” x 8.5” (front), 20” x 10” (rear)
Michelin Pilot Super Sport ZP Tires, P245/ 35ZR-19” (front), P285/ 30ZR-20” (rear)
Brembo Performance Brakes w/ Black Calipers
Performance Suspension
Dry Sump Oil System
Electronic Limited Slip Differential w/ 2.73 Performance Axle Ratio
Differential Oil Cooler
Unique Full-Width Rear Spoiler
___________________________________
.
Last edited by Turbo6TA; May 16, 2013 at 05:42 AM.
Race Director
Joined: Mar 2011
Posts: 13,262
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From: SW Florida
2021 C6 of the Year Finalist - Modified
BTW ... That option code GU6 axle (3.42) is supplied with the M7 trans. C7s
I believe both the Base and the Z51 C7s will all get the 3.42 if equipped with the manual trans.
I believe both the Base and the Z51 C7s will all get the 3.42 if equipped with the manual trans.
Safety Car
Joined: Jun 2004
Posts: 4,430
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From: Whidbey Island WA
In fairness however there were at the time quite a number of videos from some of our overseas brothers showing the C6 (LS2) still accelerating when it hit 186 and being limited there. Anyone who has ever taken a car to its top end will tell you that it doesn't just run up there and stop. At the end it picks up the last bit slowly, much slower than C6 was accelerating (although it was not gaining quickily) when it when it hit 186. There is no question it was actually limited at 186 rather than that being its top speed.