are under drive pulleys worth it ?
02-12-2006, 11:53 PM
#6
TECH Addict
iTrader: (6)
Join Date: Apr 2005
Location: Indiana
Posts: 2,488
Likes: 0
Received 0 Likes
on
0 Posts
Originally Posted by Lithium
If search is working use it...so much great info out there about this 
Trending Topics
02-13-2006, 12:10 AM
#9
TECH Addict
Join Date: Jan 2004
Location: Grosse Pointe Woods, MI
Posts: 2,042
Likes: 0
Received 0 Likes
on
0 Posts
Originally Posted by Luna
Its not really worth it if you have an auto because you have to put an alternator overdrive pulley on and I would think that would significantly decrease the HP increase you might see
02-13-2006, 12:40 AM
#10
Originally Posted by Luna
Its not really worth it if you have an auto because you have to put an alternator overdrive pulley on and I would think that would significantly decrease the HP increase you might see
Even with the alternator overdrive, have you ever actually spun over the alternator pulley? You can almost look at it and make it move if you stare hard enough!
I've never heard of an OD alternator pulley being needed with an auto. It's like what i said in the other thread, our cars are designed to put out enough juice at IDLE to run the car forever. As long as you aren't using more than 75% of the output to run the car, you SHOULD be able to idle forever with even an underdrive pulley. Once you start moving around, you have plenty of juice.
02-13-2006, 12:49 AM
#11
TECH Addict
iTrader: (6)
Join Date: Apr 2005
Location: Indiana
Posts: 2,488
Likes: 0
Received 0 Likes
on
0 Posts
Originally Posted by orangeapeel
March makes a good one too for half the price.
02-13-2006, 07:20 AM
#13
Originally Posted by TheBlurLS1
As long as you aren't using more than 75% of the output to run the car, you SHOULD be able to idle forever with even an underdrive pulley.
02-13-2006, 08:44 AM
#14
Originally Posted by TheBlurLS1
Explain-e-ate this one to me!
Even with the alternator overdrive, have you ever actually spun over the alternator pulley? You can almost look at it and make it move if you stare hard enough!
I've never heard of an OD alternator pulley being needed with an auto. It's like what i said in the other thread, our cars are designed to put out enough juice at IDLE to run the car forever. As long as you aren't using more than 75% of the output to run the car, you SHOULD be able to idle forever with even an underdrive pulley. Once you start moving around, you have plenty of juice.
Even with the alternator overdrive, have you ever actually spun over the alternator pulley? You can almost look at it and make it move if you stare hard enough!
I've never heard of an OD alternator pulley being needed with an auto. It's like what i said in the other thread, our cars are designed to put out enough juice at IDLE to run the car forever. As long as you aren't using more than 75% of the output to run the car, you SHOULD be able to idle forever with even an underdrive pulley. Once you start moving around, you have plenty of juice.
"Stock Alternator Pulley - Most commonly used. Suitable for most applications.
Overdrive Alternator Pulley - Recommended for automatic cars to help bring alternator speeds back to near stock levels without sacrificing too much horsepower. Extremely important for vehicles with high accessory drag such as cars with lots of stereo modifications.
Underdrive Alternator Pulley - Recommended mainly for track use. Not recommended for daily street use due to low alternator charging."
Thats straight from Thunder Racing
02-13-2006, 09:23 AM
#15
Banned
iTrader: (92)
Join Date: Sep 2004
Location: Atlanta
Posts: 7,757
Likes: 0
Received 0 Likes
on
0 Posts
Here's a negative statement: I have a 25% underdrive pulley on a 6 speed. If the rpm is lower than 1,800 and you're driving through a parking around a curve, the power steering is dead. You have to push in the clutch and blip the throttle. If you have an A4 car you won't be able to clutch/gas. 
You can feel some horsepower added for sure, but the poor power steering is the most obvious PITA.
You can feel some horsepower added for sure, but the poor power steering is the most obvious PITA.
02-13-2006, 09:41 AM
#16
TECH Enthusiast
iTrader: (49)
Join Date: Dec 2005
Location: ms
Posts: 607
Likes: 0
Received 0 Likes
on
0 Posts
i must be wigged out because i got the slp 25% underdrive and was told not to touch my altenator or belt tensioner. i can feel any difference on take off or in a race (obviously) but i can feel a difference when i fall out to pass someone and punch it (from about 50mph).
im deffinately sold on it and if i bought another fbody tomorrow, i'd buy a pulley for it also.
and i have an A4
im deffinately sold on it and if i bought another fbody tomorrow, i'd buy a pulley for it also.
and i have an A4
02-13-2006, 11:32 AM
#19
Originally Posted by 99camarosupersport
i've heard some bad things from users on the board about the march UD pulleys. can't think of what the comments were off the top of my head.
02-13-2006, 02:16 PM
#20
TECH Fanatic
iTrader: (7)
Join Date: Jun 2004
Location: Ventura County, California
Posts: 1,476
Likes: 0
Received 0 Likes
on
0 Posts
Originally Posted by RICEETER
i must be wigged out because i got the slp 25% underdrive and was told not to touch my altenator or belt tensioner. i can feel any difference on take off or in a race (obviously) but i can feel a difference when i fall out to pass someone and punch it (from about 50mph).
im deffinately sold on it and if i bought another fbody tomorrow, i'd buy a pulley for it also.
and i have an A4
im deffinately sold on it and if i bought another fbody tomorrow, i'd buy a pulley for it also.
and i have an A4
Do you lose power steering as Firehawk mentioned; in an A4?
I have a 25% underdrive pulley on a 6 speed. If the rpm is lower than 1,800 and you're driving through a parking around a curve, the power steering is dead. You have to push in the clutch and blip the throttle. If you have an A4 car you won't be able to clutch/gas.