Underdrive Crank Pulley - BMW Forum - BimmerWerkz.com
3-Series (E36) Chat relating to the BMW 3-Series from 1992-1999. Autodoodad Specific models include: BMW 316i, BMW 318i, BMW 318iS/ti, BMW 320, BMW 323, BMW 320, BMW 324, BMW 325, BMW 328.

 
LinkBack Thread Tools Display Modes
#1 (permalink) Old 04-04-2004, 09:31 PM
1st Gear Member
 
M3Daemon's Avatar
 
Join Date: Mar 2004
Posts: 266
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
M3Daemon is an unknown quantity at this point
(Thread Starter)
Thumbs up

Has anyone underdriven the crank pulley? Do I need a shorter belt if I do it? I know there are underdrive pulley kits available for particular accessories but which option is better (crank or accessories)? Or could I do both?



Daemon

<img src='http://www.geocities.com/bwloka/BimmerWerksSigV1.jpg' border='0' alt='user posted image' />
M3Daemon is offline  
Sponsored Links
Advertisement
 
#2 (permalink) Old 04-04-2004, 10:33 PM
You Can Has A Custom Title!!
 
Kevin325i's Avatar
 
Join Date: Mar 2004
Location: Madison, WI
Posts: 2,613
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Kevin325i is an unknown quantity at this point
Send a message via AIM to Kevin325i
Underdrive pulley kits ussually give you new pulleys and belts that will work, but i suppose it would be possible to buy your own parts.

Either way I think most underdrive pulley kits make a note that your cars idle won't be able to charge the battery properly. Which doesn't sound like much of a problem unless your constantly in traffic. Sorry i didn't have more info.

Kevin (President TBEA)

&quot;WAAAAAAARRRRRIORS, come out to plaaaaay.&quot;
Kevin325i is offline  
#3 (permalink) Old 04-05-2004, 06:27 AM
Super Moderator
 
dutchbmw's Avatar
 
Join Date: Dec 2003
Location: SW Minnesota
Posts: 5,370
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
dutchbmw has a reputation beyond repute dutchbmw has a reputation beyond repute dutchbmw has a reputation beyond repute dutchbmw has a reputation beyond repute dutchbmw has a reputation beyond repute dutchbmw has a reputation beyond repute dutchbmw has a reputation beyond repute dutchbmw has a reputation beyond repute dutchbmw has a reputation beyond repute dutchbmw has a reputation beyond repute dutchbmw has a reputation beyond repute
Send a message via AIM to dutchbmw
What's the purpose to install an underdrive pulley??

BMW '96 M3 (SOLD)
June 2005 Car Of The Month!
Quote:
Originally Posted by Torque
I was just dropped off here by aliens one day. They got bored with me.
dutchbmw is offline  
#4 (permalink) Old 04-05-2004, 07:34 AM
3rd Gear Member
 
Andrewsd1985's Avatar
 
Join Date: Oct 2003
Location: Gainesville, Florida
Posts: 698
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Andrewsd1985 is an unknown quantity at this point
Send a message via AIM to Andrewsd1985
Underdrive pulleys rotate less tha the stock pulleys allowing your engine to do less work in turn giving you more power. Check understeer.com for some advice on the pulleys, the say underdriving everything except the altenator is ok. You can do the altenator but it doesn't do much for engine power and charges slower.

PRESIDENT OF THE OVER 10 YEARS OLD AND UNDER 100K MILES CLUB
1993 325i 5spd
Benfer Performance Intake
M-tech Pedals and Shiftknob
Bavarian Auto Floor Mats
Wheelskin Steering Wheel Cover
Panasonic Head Unit
Euro Projector Lights w/ black Housing
Black Housing Clear Corners
Dinan Chip
MORE TO COME!!

<img src='http://plaza.ufl.edu/dunna/Pictures/banner.jpg' border='0' alt='user posted image' />
Andrewsd1985 is offline  
#5 (permalink) Old 04-05-2004, 07:34 AM
3rd Gear Member
 
Andrewsd1985's Avatar
 
Join Date: Oct 2003
Location: Gainesville, Florida
Posts: 698
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Andrewsd1985 is an unknown quantity at this point
Send a message via AIM to Andrewsd1985
Also have you heard of the fan delete mod? Its on the same lines as underdriving.

PRESIDENT OF THE OVER 10 YEARS OLD AND UNDER 100K MILES CLUB
1993 325i 5spd
Benfer Performance Intake
M-tech Pedals and Shiftknob
Bavarian Auto Floor Mats
Wheelskin Steering Wheel Cover
Panasonic Head Unit
Euro Projector Lights w/ black Housing
Black Housing Clear Corners
Dinan Chip
MORE TO COME!!

<img src='http://plaza.ufl.edu/dunna/Pictures/banner.jpg' border='0' alt='user posted image' />
Andrewsd1985 is offline  
#6 (permalink) Old 04-05-2004, 01:21 PM
1st Gear Member
 
M3Daemon's Avatar
 
Join Date: Mar 2004
Posts: 266
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
M3Daemon is an unknown quantity at this point
(Thread Starter)
UUC Motorwerks and understeer.com seem to have quite a difference in opinions there. I will get more into it in the next couple days.

I was thinking about the fan delete mod but it's extremely hot where I live and I don't want to take chances during the summer.




Daemon

<img src='http://www.geocities.com/bwloka/BimmerWerksSigV1.jpg' border='0' alt='user posted image' />
M3Daemon is offline  
#7 (permalink) Old 04-05-2004, 03:10 PM
Super Moderator
 
dutchbmw's Avatar
 
Join Date: Dec 2003
Location: SW Minnesota
Posts: 5,370
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
dutchbmw has a reputation beyond repute dutchbmw has a reputation beyond repute dutchbmw has a reputation beyond repute dutchbmw has a reputation beyond repute dutchbmw has a reputation beyond repute dutchbmw has a reputation beyond repute dutchbmw has a reputation beyond repute dutchbmw has a reputation beyond repute dutchbmw has a reputation beyond repute dutchbmw has a reputation beyond repute dutchbmw has a reputation beyond repute
Send a message via AIM to dutchbmw
The required power for the alternator is max 1.5 kW....lol

BMW '96 M3 (SOLD)
June 2005 Car Of The Month!
Quote:
Originally Posted by Torque
I was just dropped off here by aliens one day. They got bored with me.
dutchbmw is offline  
#8 (permalink) Old 04-06-2004, 02:45 AM
You Can Has A Custom Title!!
 
Kevin325i's Avatar
 
Join Date: Mar 2004
Location: Madison, WI
Posts: 2,613
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Kevin325i is an unknown quantity at this point
Send a message via AIM to Kevin325i
Quote:
Originally posted by 325i_daemon@Apr 5 2004, 11:01 AM
I was thinking about the fan delete mod but it's extremely hot where I live and I don't want to take chances during the summer.
Why not install an electric fan? Mount a switch inside to flip on when it's a hot day, or I imagine it would be possible to rig it up to a thermostat. I haven't seen any kits for BMWs though.

Anyone else with more info?

Kevin (President TBEA)

&quot;WAAAAAAARRRRRIORS, come out to plaaaaay.&quot;
Kevin325i is offline  
#9 (permalink) Old 04-06-2004, 07:57 AM
3rd Gear Member
 
Andrewsd1985's Avatar
 
Join Date: Oct 2003
Location: Gainesville, Florida
Posts: 698
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Andrewsd1985 is an unknown quantity at this point
Send a message via AIM to Andrewsd1985
When doing the fan delete mod you actually change the fan switch to one that kicks on your auxillary fan at a lower temperature along with the new thermostat. You can upgrade your fan to one with a higher cfm rating, but i'm not sure what the stock cfm is. Where do you live that it is so hot. I live in florida and plan to do this mod this summer. If i do see my car getting too hot its not that big of a deal to throw the fan back on.

PRESIDENT OF THE OVER 10 YEARS OLD AND UNDER 100K MILES CLUB
1993 325i 5spd
Benfer Performance Intake
M-tech Pedals and Shiftknob
Bavarian Auto Floor Mats
Wheelskin Steering Wheel Cover
Panasonic Head Unit
Euro Projector Lights w/ black Housing
Black Housing Clear Corners
Dinan Chip
MORE TO COME!!

<img src='http://plaza.ufl.edu/dunna/Pictures/banner.jpg' border='0' alt='user posted image' />
Andrewsd1985 is offline  
#10 (permalink) Old 04-06-2004, 08:58 PM
1st Gear Member
 
M3Daemon's Avatar
 
Join Date: Mar 2004
Posts: 266
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
M3Daemon is an unknown quantity at this point
(Thread Starter)
Quote:
Originally posted by Andrewsd1985@Apr 6 2004, 07:37 AM
When doing the fan delete mod you actually change the fan switch to one that kicks on your auxillary fan at a lower temperature along with the new thermostat. You can upgrade your fan to one with a higher cfm rating, but i'm not sure what the stock cfm is. Where do you live that it is so hot. I live in florida and plan to do this mod this summer. If i do see my car getting too hot its not that big of a deal to throw the fan back on.
I live in Mobile which is about 20miles from the Florida state line. Keep me posted on how the fan delete mod works out; I might do it after all...



Daemon

<img src='http://www.geocities.com/bwloka/BimmerWerksSigV1.jpg' border='0' alt='user posted image' />
M3Daemon is offline  
Sponsored Links
Advertisement
 
Reply

  BMW Forum - BimmerWerkz.com > BMW Model Specific Forums > 3-Series (E36)


Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
User Tag List

Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page
Display Modes
Linear Mode Linear Mode



Similar Threads
Thread Thread Starter Forum Replies Last Post
What does the Idle Pulley Tensioner look like (see pics)? Delmarco 3-Series (E36) 9 10-02-2005 10:00 AM
Headers Avlany 3-Series (E36) 18 09-15-2005 07:36 PM
Underdrive Pulley Instal Issue Rooz 3-Series (E36) 11 05-23-2005 07:35 PM
Turner Pulley Kit--- Help NeverLeaned 3-Series (E36) 2 10-24-2004 07:28 PM

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
Trackbacks are On
Pingbacks are On
Refbacks are On

 
For the best viewing experience please update your browser to Google Chrome