3.42 gear on A4
Thread Starter
Heel & Toe
Joined: Aug 2001
Posts: 24
Likes: 0
From: Ft Myers FL
3.42 gear on A4
If I do this do I have to recalibrate the speedo?
Or will the computer speed sensors automagically pick up the change?
I currently have 3.15's installed in a 99 vette
:seeya
Or will the computer speed sensors automagically pick up the change?
I currently have 3.15's installed in a 99 vette
:seeya
Le Mans Master
Joined: Oct 2003
Posts: 8,863
Likes: 86
From: PA
St. Jude Donor '08
Re: 3.42 gear on A4 (mr_mcse)
i had 3:15 went with 3:73. i was in same boat as you, not sure and thank God i went with 3:42 because the 3:73 are not nearly as radical as some guy say!!! DO NOT GO WITH 3:42!!!!!!!!!!!!!!!!!!!! YOULL BE DISAPPIONTED!!!!!!!!!!
I CANT STRESS IT ENOUGH!!!!!!!!! :chill: :chill: :chill:
I CANT STRESS IT ENOUGH!!!!!!!!! :chill: :chill: :chill:
Melting Slicks
Joined: Apr 2002
Posts: 2,397
Likes: 55
From: Dove Mountain, AZ
Re: 3.42 gear on A4 (mr_mcse)
Speedo will be correct no matter which gear you go with, shift points will not.
You will have to get reprogramed, Predator, LS1 Edit or have a Tunner at one of the speed shops do it. I used Predator for 3.73s and a custom tune form James and loved it.
You will have to get reprogramed, Predator, LS1 Edit or have a Tunner at one of the speed shops do it. I used Predator for 3.73s and a custom tune form James and loved it.
Drifting
Joined: Aug 2003
Posts: 1,751
Likes: 3
From: Ventura, CA Fight On Forever
St. Jude Donor '03-'04-'05
Re: 3.42 gear on A4 (NICK YOSKIN)
i had 3:15 went with 3:73. i was in same boat as you, not sure and thank God i went with 3:42 because the 3:73 are not nearly as radical as some guy say!!! DO NOT GO WITH 3:42!!!!!!!!!!!!!!!!!!!! YOULL BE DISAPPIONTED!!!!!!!!!!
I CANT STRESS IT ENOUGH!!!!!!!!! :chill: :chill: :chill:
I CANT STRESS IT ENOUGH!!!!!!!!! :chill: :chill: :chill:
Better yet, try 3.90s ! My calm demeanor comes from 3.42s :D Best,
mtv :thumbs:
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Pro
Joined: Oct 2003
Posts: 618
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From: Putting a 50¢ sticker of the U.S. Flag on a $50,000 import does not make one a patriot.
Re: 3.42 gear on A4 (Face)
:iagree:
That's why I went with the 3.42's. Out here the limit is 75 on the interstate. And naturally, I want to do 5 to 10 mph over that. When I cruise to vegas or diego I diden't want it to wind up too much. At 80mph my tach reads 2400rpm, anything more might be too much for long hauls.
AZC5
That's why I went with the 3.42's. Out here the limit is 75 on the interstate. And naturally, I want to do 5 to 10 mph over that. When I cruise to vegas or diego I diden't want it to wind up too much. At 80mph my tach reads 2400rpm, anything more might be too much for long hauls.
AZC5
Drifting
Joined: Jul 2002
Posts: 1,386
Likes: 80
From: NC
Cruise-In IV Veteran
St. Jude Contributor
Re: 3.42 gear on A4 (mr_mcse)
You have to determine your goals for the car in order to pick a good ratio for the rear end. Are you also thinking of installing a high stall converter? Are you going to road race or drag race the car? What type of street manners are you expecting? What is your expected tire life and what tires are you willing to buy every 6 to 9 months?
I chose to go with a 3.42 rear end for several reasons. You will not have to have your speedometer calibrated. You will be better off to adjust shift points and it is possible that you will see the P1870 code. (some cars see it some do not) If you get P1870 then you need to have some adjustments made with LS1Edit.
[Modified by bgood, 9:44 AM 3/9/2004]
I chose to go with a 3.42 rear end for several reasons. You will not have to have your speedometer calibrated. You will be better off to adjust shift points and it is possible that you will see the P1870 code. (some cars see it some do not) If you get P1870 then you need to have some adjustments made with LS1Edit.
[Modified by bgood, 9:44 AM 3/9/2004]
Team Owner
Joined: Apr 2001
Posts: 54,204
Likes: 180
From: S.W. Ohio. . . . . . NRA Life Member
Re: 3.42 gear on A4 (bgood)
DO NOT GO WITH 3:42
there are many web sites with info about rear axle ratio changes on a C5; here's mine:
http://mikemercury.home.att.net/342.htm
.
[Modified by Mike Mercury, 11:09 AM 3/9/2004]
Melting Slicks
Joined: Nov 2003
Posts: 3,396
Likes: 2
From: North Manchester Indiana
Re: 3.42 gear on A4 (Mike Mercury)
why do I need different tires if I run 3.73 ,,, if its due to tires spin,, so what,,,,I see no need to change tires causes of gears,,,,wear them out and buy new.....why do people say these things,,,,I have ran 4.56 gears and bias ply tires on older cars,, yea,, I had lots of tires spin,,so,,you kinda expect that...This is a new one,, I suppose the stock runcraps will run and hide with 3.73 gears....
Melting Slicks
Joined: Nov 2003
Posts: 3,396
Likes: 2
From: North Manchester Indiana
Re: 3.42 gear on A4 (wrustywrench)
I actually went with the 3.73 gears to help me keep my speed down, I will drive slower to keep rpms down on the highway,, I dont need to run 80 plus where I live,,,,but I like to get to 70 real fast,, and dont care if my tires spin,,wheeeee
Team Owner
Joined: Apr 2001
Posts: 54,204
Likes: 180
From: S.W. Ohio. . . . . . NRA Life Member
Re: 3.42 gear on A4 (wrustywrench)
why do I need different tires if I run 3.73 ,,, if its due to tires spin,, so what,,,,I see no need to change tires causes of gears,,,,wear them out and buy new.....why do people say these things,,,,I have ran 4.56 gears and bias ply tires on older cars,, yea,, I had lots of tires spin,,so,,you kinda expect that...This is a new one,, I suppose the stock runcraps will run and hide with 3.73 gears....
There are many reasons to "say" that - but since you're so smart and experienced ... I guess there's no need to tell you.
But for the others; in an A4, you don't have a manual clutch to control wheel spin. So using run-flats with 3.73 or more radical gears in an A4 will probably get you to lose every race. Sure, you can squeal your tires and impress the kiddies, but at the track you'll turn poor times and look silly.
Why do you think the Z06 uses non-run flats?
.
[Modified by Mike Mercury, 12:32 PM 3/9/2004]
Melting Slicks
Joined: Nov 2003
Posts: 3,396
Likes: 2
From: North Manchester Indiana
Re: 3.42 gear on A4 (Mike Mercury)
Who,, come on,, I wasnt knockin your experience,, I just wanted to say, that if your dont care about wheel spin, (as I said I dont) what is the reason to change out tires,,,And yes, I have plenty of experience...maybe some of us enjoy smokin the tires,, and like spinnin donuts everynow and then. I have a rod with 3.90 gears and mickey t stickey tires for gettin serious. Come on,, lets not get to defensive.....plus I believe it was also a weight issue with the non runcraps.....for the z06...and traction...dont call people stupid unless you know for sure... :smash: :smash: :smash:
