sshawk1

like title says, what et gains and or mph going from 3.23s to 4.10s?

seadoo

4:10 is way too big of a gear for an A4. 3:42 works good... I wouldnt go over 3:73 even if the car is not daily driven.

ShadowLightCSU

iTrader: (1)

Car Tek had an A4 with 4.10s and their heads/cam package in the 10s, 4000ish stall.

foff667

iTrader: (2)

TSP's 200r4 car has 4.30's and runs 10's...camarocains car runs high 10's with 4.10's in the stock 10 bolt so um who told you this again?

sshawk1

anybody have 4.10s in an a4? If so what rpms do they turn at 70 on the hwy?

foff667

iTrader: (2)

i think its like 2700 if im not mistaken id already asked that same question in the gears section

Jpr5690

iTrader: (13)

yea you would hit od in the qtr with 4.11 in a a4

Jpr5690

iTrader: (13)

3.73 your gonna have a 120mph 3-4 shift

foff667

iTrader: (2)

does anyone realize you need tires? You need to factor in for tire growth when your talking about bias plys...your probably not gonna be running BFG's if your in the mid 10's where you probably wouldnt want 4.10+ gears...most are on a bias ply which usually has about a 10% growth factor if im not mistaken which will take away some of that gear you just put on.

2001 Pewter WS6

iTrader: (43)

I have 4.11 in an A4. It is awsome. I just swapped from 3.73's to 4.11's and I love them. I don't have to shift into OD at the track either.

samz28

i'd do 3.73's instead of (3.42's) and run et's after todays track experience. or get a monster stall.

98SS Blackattack

I agree. I would go for a 4400 stall. Thats what 90% of the 10 sec. cars run.

samz28

tci ssf 3500 + nitto DR today = spin spin city
tci ssf 3500 + ET streets = need more verter
(or power).

sshawk1

others?

GueSS Who

You are not utalizing the stall to its full potential of you go with 410 gears. The point of a converter is to multiply tourque. If you don't stay in that gear but for just a sec then you can't multiply torque. I do understand that lots of 10 sec cars are running 4.10 gears but I think you can get the same time with a 3.73 gear. The more power you make you lower the gear you need. I run 3.73 gears with a 28in tall tire, which equates exactly to a 3.42 gear. I am running 6.2's in the 1/8 mile with 1.38 60fts. My car carries the wheels about 10ft past the tree with a height of about 2.5 feet. I can't imagine the car being able to pull that long of a wheelie nor the 60ft with a higher gear. I have the untimite setup for my car but there is different setups for different cars. A bolt on car would run best with 4.10 gears and a 26in tall Drag.

JMO on all of this.

StreetStalkerZ

iTrader: (1)

Seems all of you are not understanding why we run 4.10s or why i run them. If your cam is turning peak power around 6300 rpms or lower stay with 3.73s but if your cam is like mine and makes power all the way from 6400-6800 rpms then 4.10s will hlep you a little more on the 3rd gear charge at the end of the track with the RIGHT tire height.

I run 15x8 weld draglites with a 26x10x15 ET Drag that will allow me to cross the traps in 3rd gear at 6600 rpms,right where my cam peaks. 4.10s will kill your top speed in 3rd gear on regular height tires.


Scott

Pacific Muscle Cars

This is not true. The purpose of a high stall converter is to allow the engine to get into the proper rpm range quickly, and stay in that range in each gear. Without adequate gear, the converter is just slipping to sustain RPM. A slipping converter builds excess heat, which is destructive to the trans and converter. The gears should compliment the converter, and the rest of the combo.

This is also not true. Proper gear selection has absolutely nothing to do with the amount of power produced. It is a matter of power range and the rpm at which peak power is produced. Many Pro Stock cars are running 5.86 gears. Does this mean they produce less power than a street driven LS1? All other things equal, a LS1 producing peak power at 6,800 rpm will run quicker ET's on 4.10 gears than 3.42's.

To answer the original question - I don't think 4.10 gears in a stock internal A4 car is the best choice. However, for a heads/cam car producing peak power in the 6400-6800 range, they are great.

Colonel

When using a 4000+ stall, the difference between 3.23s and 4.10s is usually about a half tenth when using an efficient converter. Worth it to some, not worth it to others. A tight stall or an inefficient one will stand to gain more.

The huge stall makes up for alot. You use less gear, you work the converter harder. It takes up most of the slack. Still, you WILL be a little bit quicker with gearing that has you crossing the finish line right about your shift point.

Someone mentioned factoring in tire growth when picking a gear. You should also factor in converter slippage (it's a bigger factor than tire growth) as well as the difference between trap speed and actual speed. Actual speed across the line is higher (2-3 MPH) and is what you should base your calculations off of.