Rear diff. W/ torque converter ?
Thread Starter
Burning Brakes
Joined: Sep 2014
Posts: 901
Likes: 190
Rear diff. W/ torque converter ?
Planning out my build for recently purcahased 2004 A4 w/ 2.73 gears. Reading all I can and decided to upgrade to new diff. with 3.42 gears and torque converter in the 2800 stall range. Many claim .5 second 1/4 improvement in diff. alone and .6 improvement with torque converter alone. Is it realistic to expect 1.1 improvement doing both in the 1/4 (tune will be part of this upgrade)?
Phase II will be headers and exhaust ( x-pipe) and cat-back.
Goal is mid 12's in 1/4 but primarily looking for best 0-60 as street driving will be 95% of the time.
Phase II will be headers and exhaust ( x-pipe) and cat-back.
Goal is mid 12's in 1/4 but primarily looking for best 0-60 as street driving will be 95% of the time.
AMP Racing
Joined: Aug 2006
Posts: 10,754
Likes: 589
From: Washington TWP NJ
2023 C5 of the Year Finalist - Modified
2017 C5 of Year Finalist
St. Jude Donor '09-'10-'11-'12
I agree. Modern converters drive very well on the street. 3.42 and a 3600 converter work very well together. Along with headers and a good tune, mid 12s should be expected. Low 12s/ high 11s are possible with the proper set up.
Good luck and welcome to the C5 addiction...
Good luck and welcome to the C5 addiction...
Thread Starter
Burning Brakes
Joined: Sep 2014
Posts: 901
Likes: 190
There were some great sales this weekend. I'm going with LG Street series long tubes with Blackwing CAI and a take off Z06 Ti exhaust with a custom tune as stage I this month. Stage II will be the 3.42 with torque converter in March. The shop I'm working with (Quality Motorsports) recommended a stall no higher than 2800 for street driving
, so still researching the best stall speed at this point.
, so still researching the best stall speed at this point.
Burning Brakes
Joined: Feb 2012
Posts: 1,047
Likes: 43
From: Longview Texas
As already stated I don't think you'll be happy with a 2800. IMHO you won't notice any difference over stock. Converters are expensive or time consuming to change (if you're doing it yourself) so just go with the 3600 the first time. We run a 4000 and it could be driven on the street daily with a good cooler. Since we race ours now and do very little street driving I wish I would have gone with a 4400.
Scott
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Melting Slicks
Joined: Jun 2001
Posts: 2,264
Likes: 546
There were some great sales this weekend. I'm going with LG Street series long tubes with Blackwing CAI and a take off Z06 Ti exhaust with a custom tune as stage I this month. Stage II will be the 3.42 with torque converter in March. The shop I'm working with (Quality Motorsports) recommended a stall no higher than 2800 for street driving
, so still researching the best stall speed at this point.
, so still researching the best stall speed at this point.
Pro
Joined: Apr 2013
Posts: 502
Likes: 4
From: Huntsville, AL Relaxed!
I agree. I have 3:15's and a 3400 stall. It drives very well, but I really wish the TQ conv was looser. Having a looser Tq conv. will allow more room to grow the engine's HP, as well.
A 2800 stall is not worth the effort. Go 3600...you won't regret it!
Regards,
KoreaJon
Burning Brakes
Joined: Feb 2012
Posts: 1,047
Likes: 43
From: Longview Texas
With a 3.90, Yank SS4000, Vararam, 17" drag radials on OEM thin spokes and a tune we went 12.22 in decent air (not killer) with 1.6x 60' times. I would not be afraid to drive that combination on the street but that is just a personal preference.
Scott
Scott
Drifting
Joined: Jan 2004
Posts: 1,661
Likes: 13
From: Knoxville TN
When I was running that gear/TC combination in my street/strip car, I drove from Dallas Texas home to Knoxville Tennessee in July with no problems. As you said, it is a personal preference. BTW, I went 10.69@125 at the track also.