jhshnh

As I'm getting ready to buy my rearend for my 2000 A4 I'm wondering which one is better?
Not a DD.
Sees frequent track time.
More concerned with et over hwy use.
I've done the calculations and 4.11s theoretically work for a 28 tire at 130 mph trap speed at 6500 rpm. Am I going to far?

01ssreda4

iTrader: (96)

You have to factor in the unknown of converter slip. I cross the traps at 6500 at 119mph with a 373 and stock height tire.

jhshnh

Very true.

nj02z

iTrader: (6)

I run 3.89 with a 26" tire and I would not go any lower.

jhshnh

What are rpm you turning at the quarter?

nj02z

iTrader: (6)

6350 /6450

madmike9396

iTrader: (29)

3.90s !

transampetews6

iTrader: (31)

Lots of factors go into deciding what gear you need. power, weight, operating rpm, tire size, converter and so on. I run 3.70s with a 28" tire at 142 mph and about 6500 rpm. If you're not making the same power maybe 3.90s might make more sense. keep in mind that if you run a 26" tire and you run out of rpm you can switch up to 28s.

HCI2000SS

iTrader: (2)

Tell us your current mods, and future plans for the car?

jhshnh

2000 Z A4 with 50k miles.
Current mods are full suspension, kooks headers and duals, cai, and tune. Car runs 12.80s with stock tire and 2.73s.

The next phase will be tranny upgrade and 3600-4000 stall, built rear end, and drag radials.

After this I'll probably do a cam and intake swap while I build a motor... probably a 402 or 416.

Goal is to run 10s n/a with new motor. Car isn't a daily driver so I'm not worried about too much gear.

Chase2000SS

i made a 10.98 pass @ 122.5 with my 2000 SS, 6.2 LS-3 swap, cam only, yank 4000 and 3.73s in stock 10 bolt with 26"