sk346

i want 373 or 410 gears for my a4, i have a multitude of mods planned, including g5x3, exhaust, stall, etc etc. i just want to know if anyone has real numbers to share with me. a4 in 3rd gear with 410s, i am not expecting a trap speed in excess of 115 mph. i want to avoid the car shifting into OD in the 1/4 mile. any 373 numbers bearing the same variables?

cablebandit

iTrader: (37)

gimme a sec and i'll get you the 3.73 numbers. I do know that converter locked....3.73..26" tire was 140mph in 3rd gear. That was trapping 136mph in the 1/4

ok got some more info:
in 3rd unlocked, my mph was 115 @ 6600 rpms. This is with a vig 3800 multidisc converter. If your converter is more efficient, your rpms will be a tick lower. Go with a 28" tire and they will be lower as well. Remember, your trap speed is an avg so you will be going a little faster than your trap speed when you let off the gas. I trapped 136 but was going 140 when i let off the gas

hondakiller

iTrader: (3)

4.10's 26 inch tire and 6500rpm its 125mph or so with 3.73's itd be 129. thats converter unlocked btw.

RedHardSupra

iTrader: (1)

in left top corner you got a tire size, top row is rpm shift, left column is final gear. trans gear is set to 1.0.
tire is in inches, speeds are in mph.

sk346

thanks a million, guys. i was counting on bumping the RL to 6900 and shifting at 6700, so 410s would definitely be my choice of track gear, mileage is of no concern. thanks again.

cablebandit

iTrader: (37)

i dont think that table above is correct....besides my 3.73 results...i know with 3.23 and converter locked....my car hit 150 at 7000rpm

RedHardSupra

iTrader: (1)

1. converters seriuosly screw with rpms
2. how do you know your speedo is calibrated correctly? do you know EXACTLY what is the effective size of your tire at 150mph?
this is theory, this is math. how well it fairs with reality is anyone's guess

sk346

so it appears...since i will have a stall with these gears, 373s with a 26" tire will keep me from shifting to OD in the 1/4 with a trap speed 112-115. 410s with the same setup will want OD, correct?

cablebandit

iTrader: (37)

RedHardSupra, I know the table is mathmatically correct, just not the numbers you will see with a stalled auto...I check my speedo with a GPS....I always get rpm/mph data from logs anyway...you know how crazy our gauges are. Wasn't trying to dis ya, I just want him to know that if he bases his gearing combo on that chart, he is gonna be disappointed

3.73 should be fine for your combo

sk346

ok, sounds good, thanks again. i've looked at many charts in comparison to my personal field testing/track experience with the car(s), and it didn't match up very well at all...

Ragtop 99

iTrader: (7)

For unlocked, you need to increase the rpm by 4 - 8% for converter slip for a given mph.