njmaster

iTrader: (5)

I have an A4/LS1 with 4.10's and i will be adding a 3600 stall. I am wondering what kind of rpms i will be turning running the 1/4 mile??

Big Al

iTrader: (1)

Depends on a lot of other things like how fast the car runs and how tall the tires are. There are a ton of MPH RPM calculators on the web.

http://www.bgsoflex.com/rpmmph.html

And a hundred more are out there. One thing more you need to know is how much your converter slips. Rule of thumb is around 10%, but they vary.

Al 95 Z28

speedtigger

iTrader: (16)

Here is a better calculator. Figure in about 7% converter slip for unlocked.
http://www.hotrodpitstop.com/tool.php#7

njmaster

iTrader: (5)

appreciate the help fellas.

njmaster

iTrader: (5)

Alright so i used the calculators and i had to estimate the mph because i haven't ran the car yet. I estimated around 115 or 120 for mph and with my tire height i'm getting around 6500-6600 rpm. Is that too high for the quarter? should i think about replacing the gear with a 3.73?

speedtigger

iTrader: (16)

What RPM do you plan on shifting the car?

njmaster

iTrader: (5)

I'm not really sure?? I will be running a 3600 stall with futrals f13 cam? It stops making power around 6800 rpm?

speedtigger

iTrader: (16)

Really you could run either gear and not notice much performance difference. Depends on how hard core you are. If you want every last hundredth of quarter mile performance then go 4.10. If you do any amount of highway driving, you might choose the 3.73.

PlowBoy11

I have a 98 Pretty stock LS1/A4 with 100 shot, 4:10s and 26 DR Stock stall last year. Car went 12.4 at about 112 would hit 4th gear right at 1/4 mile mark. Car is also a DD car cruises 26ish at 70. Put a 3400 stall in it this winter. Love the 4:10s in mine. 3:73s would not be bad either I bet.

Silver LS1

iTrader: (3)

Why not lock the converter up once you pull high gear? Then it will be the same as you are currently running through the traps at.