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E36 General discussion and technical help for (E36) 1992-1999 3 series cars. 318, 323, 325, 328.

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Old 11-28-2005, 03:46 PM   #46
komodo
 
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Name: komodo
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Location: Athens, GA
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Quote:
Originally Posted by ChrisWorrell
did not read the responses so i apologize if this was answered but

The underdrive pulleys are actually hurting your ability to power your car. The idea behind underdrive pulleys is that it slows down the rotation of the belt, therefor the alternator pulley does not spin as much as it used to. This causes less power to be regained through the laternator then usual.

This could be some of your troubles since you have underdrive pulleys
I did not underdrive the alternator.
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Old 11-28-2005, 05:03 PM   #47
DEATH2000
 
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Location: Calgary, Alberta
Rate My Car: 111 / 340
Your Ride: 1998 E36 328i sedan
Quote:
Originally Posted by ChrisWorrell
The underdrive pulleys are actually hurting your ability to power your car. The idea behind underdrive pulleys is that it slows down the rotation of the belt, therefor the alternator pulley does not spin as much as it used to. This causes less power to be regained through the laternator then usual.

This could be some of your troubles since you have underdrive pulleys
Alot of people here have underdrive pullies and they dont have the same problem. Most underdrive pully kits like the one from UUC dont come with alternator pullies, so u stick with the stock one most of the time.
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Old 11-10-2012, 07:31 PM   #48
Manolito

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Rate My Car: 338 / 340
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At the risk of revealing my ignorance, I have a couple of questions:

1) e36s came with three alternators, 80 AMP, 120 AMP, and 140 AMP. Which are you using?
2) You mentioned that the cap on your amplifier was 3000 watts. How big is your amplifier?
3) Are you using stock headlights, and do you drive with your running lights on? If you have all those things turned on at once, you are going to have a problem, but the biggest loads will be the audio amp and the headlights.

When you count up your load, remember that each headlight is 55 watts (at least) on low beam, so with driving lights we have 220 watts up front. Toss in another half dozen 15 watt running lights and we are up to 310 watts (24 amps) constant load when you flip on the headlights. Toss in another 8 amps for the ignition and computers, and we are up to 32 amps before you turn on any toys.

Two batteries will help only if you have a light-dimming sudden load that fries the alternator. If the problem is exceeding the alternator's duty cycle and overheating it, all you can do is adapt a bigger alternator and try to keep it cool.

There were 5-series police cars in the 1990s. I doubt that those alternators are still available, and if they are, only European vendors would carry them.

Last edited by Manolito; 11-10-2012 at 07:41 PM..
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