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.

Thread Tools Search this Thread Rate Thread Display Modes
Old 02-18-2012, 01:37 PM   #21
Banned User
Join Date: Aug 2009
Location: St Louis, MO
Posts: 3,008
My Ride: 01 330x-xi
The alternator pulley is the heaviest of the 3. It's made from brass and extremely heavy. The TMS pulley is much lighter, I'd keep that one. I rarely know what I'm talking about. Take this with a grain of salt.
xixixi is offline   Reply With Quote
Old 02-18-2012, 09:43 PM   #22
Banned User
Join Date: Jul 2008
Location: FLA
Posts: 2,894
My Ride: E90 6MT
Originally Posted by Rob43 View Post
Ice, & whoever else;

I'm just not a fan of changing out the alternator pulley, If there's any gain at all, I doubt it could be measured. The down side though is bigger, your Bimmer might not like you messing with its voltage requirements, that's why half of the manufactures don't even make an alt. pulley in the first place.

Edit: I need to be more specific, if you buy an under drive pulley kit that comes with an alt. pulley, my thoughts are to buy one with the stock size. As in an alt. pulley that is not under driven, you'll get the reduced weight, but it won't mess with your electrical system.

Good luck.
It's BARELY smaller than stock and a little lighter. My alternator has already started to "whine" but it was making noises before.
Iceman00 is offline   Reply With Quote
Old 02-20-2012, 01:30 AM   #23
Registered User
Join Date: Jan 2010
Location: Silicon Valley
Posts: 781
My Ride: 2003 ZHP 6MT
My new alternator pulley is larger diameter than stock. (It was also taller than stock but that's been fixed.) I thought that was the point of an underdrive accessory pulley, no?
Lowering my car's resale value one track day at a time...
LivesNearCostco is offline   Reply With Quote
Old 02-20-2012, 09:31 AM   #24
Registered User
Join Date: Aug 2009
Location: Ontario Canada
Posts: 966
My Ride: 1999 328i (M54b30)
Ya a smaller pulley would over-drive it. Which I doubt they are doing. More likely its the same size or the pulley Iceman got is definitely intended for another alternator which may have a slightly smaller pulley.
jared_wiesner is offline   Reply With Quote

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 02:54 AM.

Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2017, vBulletin Solutions, Inc.
(c) 1999 - 2016 performanceIX Inc - privacy policy - terms of use