need your knowledge on 3.73s

[nino]

i have searched extensively and read everything there is to read, but what i want is actual thoughts and feelings. i drive 60 miles to work, but love the idea of a strong launch. i thought if i drive 55 mph to work it would not be so bad. am i wrong in this belief? my car has 30000 miles on it now. and i was wondering if anybody here drives daily with 3.73 and if they have had problems. the definition on this site kind of scared me away from getting them. but i think i would love to have them for the track. but then i have 3.42s now and wonder if it would make that much of a difference. anybody out there that can help?

[AMinor65]

Go to this link:
http://www.venommotorsports.com/howt...ldiameters.htm

It should give you all of the information you need and then some. The transmissions ratio of .7 is correct for automatics. If you have a manual, do a search on trans ratio. Someone has a post with the manual gear ratios.

[97chevycamaro]

I heard it messes up your mileage, like if you've gone 20,000 miles it will say 30,000, or something like that.

[Dominic]

If you dont recalibrate youre speedo then it will throw youre milage off

I really don't see any benefit in going with 3.73s unless you *really* are seeking drag times... 3.42s in an A4 should be plenty.

But, it will throw off your speedometer in the safe direction.

If you have 3.42s now in an A4, at 2000RPM you should be going approx 65MPH.

If you change to 3.73s youll still read 65mph @ 2000RPM, but youll actually be going 59mph.

-10%

Your 118mph speedlimiter will become 106.2mph... even though youll still read 118 - and your odometer will be 10% higher.

20,000 miles = 22,000
100,000 miles = 110,000

I hope that helps...

[nino]

thanks cardinal that really does help. and i really am looking for track times here. with all the money i have spent so far. its all about the 1/4 mile.

[marco]

Yeah any upgrade on gears if not corrected will cause all these side effects on your car. But you can always get the SLP speed processor (P/N: 63007) and you can correct your speedometer. With it you can always change it. wether you swap gears or change tire sizes in the future. Alot of people talk about taking the car to the dealership and having someone program the computer...but I've found out that its more expensive that way. If you find someone to do it cheaper than $180 then do it through them. But also remember that with the speed processor you can always go back and make changes whenever you need to. [img]graemlins/burnout.gif[/img]

[marco]

Cardinal,
Those percentages on the 3.73's you posted were going from what to what? Like from 3.42's to 3.73's or 3.23's to 3.73's or what?

[Arctic02]

I had 3.73's in my '91 Sonoma 2.5L and loved them. I can tell the difference between the 3.23's my Camaro and my old trucks 3.73's. Both were M5's, but the truck was lighter with a smaller engine and the Camaro is heavier with a 6cyl, so I am not sure if it was the gears that made the difference, but I could wind throught the gears. Warning: on M5's the first gear will a really short ride, pop it in, pop it out. I liked them.