A4 with 3.42 ratio
Thread Starter
Instructor
Joined: Jun 2010
Posts: 228
Likes: 2
From: California
A4 with 3.42 ratio
Bought used 99 C5 automatic. Was looking over the tune that was in it with EFILIVE. No wonder it seems to move quicker then my friends C5, has 3.42 differential. Gas milage still good too. My question is do these gears lower my top end speed? I think it was originally limited to 170. Tune in car now has it limited to 158. Is there a reason for this? Will I be over revving at 170? Thanks for any input on this. Was thinking of raising limit back up. Not that I drive at those speeds all the time.
Is this more of a drag racing ratio?
Is this more of a drag racing ratio?
Le Mans Master
Joined: Aug 2006
Posts: 9,987
Likes: 25
From: If opportunity doesn't knock, build a door. South West Florida / Livin' The Dream
St. Jude Donor '12
Melting Slicks
Joined: Jul 2007
Posts: 2,939
Likes: 7
From: Simpsonville SC
St. Jude Donor '09-'10
I also installed a 3.42 in my A4. I have my max speed limited to 399 MPH.
I don't want my computer to limit what my car can do. The rev limiter will suffice to limit my top speed. I wish I could find a place to run it up, but I will not speed on any public road.
I don't want my computer to limit what my car can do. The rev limiter will suffice to limit my top speed. I wish I could find a place to run it up, but I will not speed on any public road.
Team Owner
Joined: Apr 2001
Posts: 54,204
Likes: 180
From: S.W. Ohio. . . . . . NRA Life Member
be cautious here; just because a tuner program says it's set for a 3.42 ratio- doesn't mean that's what's actually installed in the car.
http://www.tim-yvonne.com/mikemercury/ratio.htm
Drifting
Joined: Dec 2004
Posts: 1,706
Likes: 5
From: Toronto Ontario
be cautious here; just because a tuner program says it's set for a 3.42 ratio- doesn't mean that's what's actually installed in the car.
http://www.tim-yvonne.com/mikemercury/ratio.htm
http://www.tim-yvonne.com/mikemercury/ratio.htm
My tuner plugged in his laptop in my car and asked me if I had done a gear swap because it showed the car having 3.42s. Still had the stock 2.73s at that time.
Do the 3rd gear test.
Corvette Stories
The Best of Corvette for Corvette Enthusiasts
Top 10 Most Expensive Corvettes Ever Sold on Bring A Trailer
Brett Foote
10 Things Every Corvette Owner Needs (2026 Edition)
Michael S. Palmer
8 Most "Only Corvette Owners Understand" Quirks and Problems
Pouria Savadkouei
10 Reasons the C6 Z06 is Still A Performance Benchmark After 20 Years
Joe Kucinski
How Much Horsepower Every Corvette Engine "LOST" in 1972
Joe Kucinski
Top 10 DOs and DON'Ts for Protecting Your Convertible Top!
Michael S. Palmer
Top 10 Most Explosive Corvettes Ever Made: Power-to-Weight Ratio Ranked!
Joe Kucinski
150 hp to 1,250 hp: Every Corvette Generation Compared by the Specs That Matter
Joe Kucinski
8 Coolest Corvette Pace Cars (and Replicas) of All Time
Verdad Gallardo
Burning Brakes
Joined: Aug 2004
Posts: 783
Likes: 0
From: Phoenix Arizona
A4 with 3.42 is the perfect combo for an Auto....... You are lucky your car came that way. I bet you also have a TC, because most guys who do gears do a TC at same time. But to answer your questions, I was told that your top speed may be reduced by 1-5 mph.
Melting Slicks
Joined: Aug 2006
Posts: 2,205
Likes: 2
From: port monmouth nj
had mine at 167 with 3.42 with h/c 90/90 and it was still pulling hard i was at about 5100rpm. hp and torque on dyno usually cross about 5250 rpm thats why it was still pulling. running 3.73 now and it pulls even harder just havent run it up that high but im curios to know. one thing for sure ill get there a little faster with 3.73's
Former Vendor
Joined: Jan 2008
Posts: 4,202
Likes: 1
From: Greenville SC
Hey Guys, here's some facts..
All auto's in C5's came from GM w/2.73's or 3.15's was the performance gear ratio for the automatics...
All 6-speed manuals in C5's came from GM w/3.42 gears...
The higher the number the lower the gear ratio...
The lower your gear ratio, the lower your top speed will be...
All auto's in C5's came from GM w/2.73's or 3.15's was the performance gear ratio for the automatics...
All 6-speed manuals in C5's came from GM w/3.42 gears...
The higher the number the lower the gear ratio...
The lower your gear ratio, the lower your top speed will be...
Team Owner
Joined: Apr 2001
Posts: 54,204
Likes: 180
From: S.W. Ohio. . . . . . NRA Life Member
