3.73 worth it?
Race Director
Joined: Nov 2001
Posts: 18,682
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St. Jude Donor '05-'06-'07-'08-'09-'10-'11-'12
OR...
smoke show upto the top of 4th when you are being childish
Instructor
Joined: Jul 2007
Posts: 176
Likes: 6
From: Golden Colorado
in first gear, the overall ratio with the 3.42's (in the A4) is slightly more that the C5 Z06 MN12 in first gear. But if you add the converters stalled torque ratio... it greatly exceeds the Z06 first gear overall ratio.
A4 overall ratio: first gear: 3.42 rear axle = 10.46
MN12 Z06 overall ratio: first gear: 3.42 rear axle = 10.15
MN6 overall ratio: first gear: 3.42 rear axle = 9.09
and again, the added ratio of the A4's torque converter isn't figured into its number.
The 3.73 in the A4 gives a first gear overall ratio of 11.4;
3.90 = 11.93
4.10 = 12.55
A4 overall ratio: first gear: 3.42 rear axle = 10.46
MN12 Z06 overall ratio: first gear: 3.42 rear axle = 10.15
MN6 overall ratio: first gear: 3.42 rear axle = 9.09
and again, the added ratio of the A4's torque converter isn't figured into its number.
The 3.73 in the A4 gives a first gear overall ratio of 11.4;
3.90 = 11.93
4.10 = 12.55
Thanks for doing the math, Mike. I have a 2800 RPM converter in this car also, and I think the 3.42s will be plenty if I choose to go that way. Just finished the H/C/TC job last month, haven't yet had the car down the track (too cold here in Denver), I'll see if my goals are met with the 3:15 before I do anything. Only 100 miles with the new setup, just enough to whet my appetite. Lots of packed rutted snow for the last month, just starting to melt off the sidestreets this week. Maybe tomorrow will be the day to take it out on a back road a give it a go.
Pro
Joined: Feb 2007
Posts: 689
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From: West Jordan Utah
