1/4 mile time
Thread Starter
Instructor
Joined: Dec 2010
Posts: 134
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1/4 mile time
Took my 98 C5 A4 with AA SC to the track tonight and ran constantly 12.3 @ 115. I have 2.73 gears and had a hell of a time getting the RPMs up quick. I am running stock tires too. How easy is it to change rear gear to 3.42s and what else should I consider. My car is at 500 RWHP and I want to get in the 11s. Any help?
Le Mans Master
Joined: Feb 2004
Posts: 8,629
Likes: 16
From: York PA
Took my 98 C5 A4 with AA SC to the track tonight and ran constantly 12.3 @ 115. I have 2.73 gears and had a hell of a time getting the RPMs up quick. I am running stock tires too. How easy is it to change rear gear to 3.42s and what else should I consider. My car is at 500 RWHP and I want to get in the 11s. Any help?
What you need to do is buy a complete 3.42 rear.
A build rear would be the best (hardened shafts, etc)
If that's not in the budget, look in the C5 parts 4 sale section.
With sticky tires, you should at least install a driver side harden shaft.
You should also install a new torque converter while it's apart, something in the 3200-3600 range.
With that combo you should run 11.4's all day.
Team Owner
Joined: Jan 2007
Posts: 29,063
Likes: 1,839
From: cookeville tennessee
Ok, I like you. You could have said "How hard".
What you need to do is buy a complete 3.42 rear.
A build rear would be the best (hardened shafts, etc)
If that's not in the budget, look in the C5 parts 4 sale section.
With sticky tires, you should at least install a driver side harden shaft.
You should also install a new torque converter while it's apart, something in the 3200-3600 range.
With that combo you should run 11.4's all day.
What you need to do is buy a complete 3.42 rear.
A build rear would be the best (hardened shafts, etc)
If that's not in the budget, look in the C5 parts 4 sale section.
With sticky tires, you should at least install a driver side harden shaft.
You should also install a new torque converter while it's apart, something in the 3200-3600 range.
With that combo you should run 11.4's all day.
at least a M/T D/R tire in the rear.
Thread Starter
Instructor
Joined: Dec 2010
Posts: 134
Likes: 0
Ok, I like you. You could have said "How hard".
What you need to do is buy a complete 3.42 rear.
A build rear would be the best (hardened shafts, etc)
If that's not in the budget, look in the C5 parts 4 sale section.
With sticky tires, you should at least install a driver side harden shaft.
You should also install a new torque converter while it's apart, something in the 3200-3600 range.
With that combo you should run 11.4's all day.
What you need to do is buy a complete 3.42 rear.
A build rear would be the best (hardened shafts, etc)
If that's not in the budget, look in the C5 parts 4 sale section.
With sticky tires, you should at least install a driver side harden shaft.
You should also install a new torque converter while it's apart, something in the 3200-3600 range.
With that combo you should run 11.4's all day.
Thread Starter
Instructor
Joined: Dec 2010
Posts: 134
Likes: 0
Ok, I like you. You could have said "How hard".
What you need to do is buy a complete 3.42 rear.
A build rear would be the best (hardened shafts, etc)
If that's not in the budget, look in the C5 parts 4 sale section.
With sticky tires, you should at least install a driver side harden shaft.
You should also install a new torque converter while it's apart, something in the 3200-3600 range.
With that combo you should run 11.4's all day.
What you need to do is buy a complete 3.42 rear.
A build rear would be the best (hardened shafts, etc)
If that's not in the budget, look in the C5 parts 4 sale section.
With sticky tires, you should at least install a driver side harden shaft.
You should also install a new torque converter while it's apart, something in the 3200-3600 range.
With that combo you should run 11.4's all day.
It was really hard to get it off the line. My best 1/8th mile time was 8.1 @ 95. Gearing is just too high I guess.
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Verdad Gallardo
Racer
Joined: Aug 2001
Posts: 310
Likes: 0
From: Tomball Texas
[QUOTE=dc491;1578409662]
My A4 is right at 505rwhp and I run right around 7.5-6@97-98 (1.9 - 2.0 60') in the 1/8th with a stock converter on 3.42 gears.
I did run 12.1-2 @117-118 (8.0 1/8) with 50 less rwhp a while back. I expect to be real close to high 10's when I replace my converter.
I would not be suprised to see you drop close to a second on your 1/8 mile time with 3.42's, DR's and a nice converter.
I bought a 3 rib pullout from a Z for about 500 if I remember correctly. The R&R was 450. I installed my S/C as well, however dropping the cradle on jackstands seems like a pain in the azz. Not to mention 450 for the diff R&R sounded like a deal to me.
One more thing you will have to consider is that the 2.73 housing limits your gear choices. I think Motive makes a 3.90 with a thicker ring that will work in that housing, however I have heard it does not make the strongest setup.
I did run 12.1-2 @117-118 (8.0 1/8) with 50 less rwhp a while back. I expect to be real close to high 10's when I replace my converter.
I would not be suprised to see you drop close to a second on your 1/8 mile time with 3.42's, DR's and a nice converter.
I bought a 3 rib pullout from a Z for about 500 if I remember correctly. The R&R was 450. I installed my S/C as well, however dropping the cradle on jackstands seems like a pain in the azz. Not to mention 450 for the diff R&R sounded like a deal to me.
One more thing you will have to consider is that the 2.73 housing limits your gear choices. I think Motive makes a 3.90 with a thicker ring that will work in that housing, however I have heard it does not make the strongest setup.
Last edited by SLVRCPE; Aug 14, 2011 at 07:41 PM.
