E46 BMW Social Directory E46 FAQ 3-Series Discussion Forums BMW Photo Gallery BMW 3-Series Technical Information E46 Fanatics - The Ultimate BMW Resource BMW Vendors General E46 Forum The Tire Rack's Tire Wheel Forum Forced Induction Forum The Off-Topic The E46 BMW Showroom For Sale, For Trade or Wanting to Buy

Welcome to the E46Fanatics forums. E46Fanatics is the premiere website for BMW 3 series owners around the world with interactive forums, a geographical enthusiast directory, photo galleries, and technical information for BMW enthusiasts.

You are currently viewing our boards as a guest which gives you limited access to view most discussions and access our other features. By joining our free community you will have access to post topics, communicate privately with other members (PM), respond to polls, upload content and access many other special features. Registration is fast, simple and absolutely free so please, join our community today!

If you have any problems with the registration process or your account login, please contact contact us.

Go Back   E46Fanatics > Tuning & Tech > Driveline, Engine & DME Tuning

Driveline, Engine & DME Tuning
Talk about driveline improvements, NA tuning and DME tuning your E46 BMW here. This includes diffs, intakes, exhausts, chips, software and OBD tuning.

Reply
 
Thread Tools Search this Thread Rate Thread Display Modes
Old 09-27-2010, 11:44 AM   #41
SalM
Registered User
 
Join Date: Aug 2009
Location: Long Island,NY
Posts: 6,455
My Ride: Shhh
Anybody have a 3.46 around with preferably in the 50k mile range?
__________________


SalMPhotography
SalM is online now   Reply With Quote
Old 09-30-2010, 11:16 AM   #42
Tom///
Registered User
 
Join Date: Feb 2004
Location: bay area
Posts: 465
My Ride: 95 M3 RIP, tpz 330ci
Quote:
Originally Posted by secono330ci View Post
Yeah bro I would definately do the 3.15 then. If you could find a 3.23 from an xi that would be perfect but very hard to find.

What he said I scoured the web for a jnked 325xi diff no luck, so I have the 3.15, get rid of the 2.93 its crap.

My car is 5spd I would HIGHLY recommend AGAINST a 3.46 unless you want to hear yourself consistently at WOT on the fwy.

Tom
__________________
Tom/// is offline   Reply With Quote
Old 10-03-2010, 11:03 PM   #43
xixixi
Banned User
 
Join Date: Aug 2009
Location: St Louis, MO
Posts: 3,008
My Ride: 01 330x-xi
Quote:
Originally Posted by Tom/// View Post
What he said I scoured the web for a jnked 325xi diff no luck, so I have the 3.15, get rid of the 2.93 its crap.

My car is 5spd I would HIGHLY recommend AGAINST a 3.46 unless you want to hear yourself consistently at WOT on the fwy.

Tom
BS 3:46 at 60mph (speed limit where i live) isn't sh!t. I run a 3.07 atm and i never drive in 5th gear on the hwy cause i get better MPG in 4th. I drive a 5 spd.... half of this site is he said she said bs add XI you need boots that go up to you ears to avoid the BS
xixixi is offline   Reply With Quote
Old 10-03-2010, 11:24 PM   #44
TrickTizzle
Registered User
 
Join Date: Nov 2008
Location: Minneapolis/Milwaukee
Posts: 3,069
My Ride: 325i
Send a message via AIM to TrickTizzle
3.46
Quicker off the line.
3,000 rpm at 70mph makes speeding up much easier.
__________________
TC Kline | BMW Performance | Active Autowerke
.
TrickTizzle is offline   Reply With Quote
Old 10-03-2010, 11:32 PM   #45
xixixi
Banned User
 
Join Date: Aug 2009
Location: St Louis, MO
Posts: 3,008
My Ride: 01 330x-xi
Quote:
Originally Posted by TrickTizzle View Post
3.46
Quicker off the line.
3,000 rpm at 70mph makes speeding up much easier.
everyone knows 3k is WOT
xixixi is offline   Reply With Quote
Old 10-04-2010, 03:07 PM   #46
Kubica
Registered User
 
Join Date: Apr 2008
Location: Boston
Posts: 4,236
My Ride: 2003 325xi
Quote:
Originally Posted by xixixi View Post
add xi you need boots that go up to you ears to avoid the bs:p
+1.
Kubica is offline   Reply With Quote
Old 10-08-2010, 02:01 PM   #47
SalM
Registered User
 
Join Date: Aug 2009
Location: Long Island,NY
Posts: 6,455
My Ride: Shhh
Guys I'm gonna hold off on the differential due to the fact that my car is up for sale!
__________________


SalMPhotography
SalM is online now   Reply With Quote
Old 10-12-2010, 09:14 PM   #48
Ant171717
Registered User
 
Join Date: Apr 2010
Location: T.O.
Posts: 125
My Ride: 02 325i
Sorry to thread jack but what will a 3.64 do to my 5spd 325i?
Ant171717 is offline   Reply With Quote
Old 10-12-2010, 09:32 PM   #49
BMW_SSG
Registered User
 
BMW_SSG's Avatar
 
Join Date: Mar 2003
Location: El Paso, TX /&\ Lawton, OK
Posts: 744
My Ride: '02 325i|'11 GT500
Send a message via Yahoo to BMW_SSG
check this website out: http://www.grimmjeeper.com/gears.html

and you will end up with something like this(http://en.wikipedia.org/wiki/Gear_ratio):

GearRatio1st gear2.97:12nd gear2.07:13rd gear1.43:14th gear1.00:15th gear0.84:16th gear0.56:1reverse3.38:1
In 1st gear, the engine makes 2.97 revolutions for every revolution of the transmission’s output. In 4th gear, the gear ratio of 1:1 means that the engine and the transmission’s output are moving at the same speed. 5th and 6th gears are known as overdrive gears, in which the output of the transmission is revolving faster than the engine.
The Corvette above has a differential ratio of 3.42:1. The ratio means that for every 3.42 revolutions of the transmission’s output, the wheels make one revolution. The differential ratio multiplies with the transmission ratio, so in 1st gear, the engine makes 10.16 revolutions for every revolution of the wheels.
The car’s tires can almost be thought of as a third type of gearing. The example Corvette Z06 is equipped with 295/35-18 tires, which have a circumference of 82.1 inches. This means that for every complete revolution of the wheel, the car travels 82.1 inches. If the Corvette had larger tires, it would travel farther with each revolution of the wheel, which would be like a higher gear. If the car had smaller tires, it would be like a lower gear.
With the gear ratios of the transmission and differential, and the size of the tires, it becomes possible to calculate the speed of the car for a particular gear at a particular engine RPM.
For example, it is possible to determine the distance the car will travel for one revolution of the engine by dividing the circumference of the tire by the combined gear ratio of the transmission and differential.

It is possible to determine a car’s speed from the engine speed by multiplying the circumference of the tire by the engine speed and dividing by the combined gear ratio.

GearDistance per engine revolutionSpeed per 1000 RPM1st gear8.1 in (210 mm)7.7 mph (12.4 km/h)2nd gear11.6 in (290 mm)11.0 mph (17.7 km/h)3rd gear16.8 in (430 mm)15.9 mph (25.6 km/h)4th gear24.0 in (610 mm)22.7 mph (36.5 km/h)5th gear28.6 in (730 mm)27.1 mph (43.6 km/h)6th gear42.9 in (1,090 mm)40.6 mph (65.3 km/h)
__________________
BMW_SSG is offline   Reply With Quote
Reply

Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes Rate This Thread
Rate This Thread:

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Censor is OFF





All times are GMT -5. The time now is 08:56 AM.


Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2014, vBulletin Solutions, Inc.
(c) 1999 - 2011 performanceIX Inc - privacy policy - terms of use