Overdrive Pulley?

[MuranoSE]

Okay so I am running a very intense sound system in my Bravada and have came to the point where my headlights are dimming only at idel with my system going. Now since i did an HID conversion I'm worried about damaging them.

 

So basically I'm curious to if there is an overdrive pulley available for our alternators in order to speed up the RPM at idle?

[PeterbiltChrome]

you could go to a smaller alternator pulley but it won't make a huge difference.

 

check your voltage regulator??

 

You could always bump up to a bigger wattage for your alternator, I feel that would be the smartest choice

[BBSilverado]

you could go to a smaller alternator pulley but it won't make a huge difference.

 

check your voltage regulator??

 

You could always bump up to a bigger wattage for your alternator, I feel that would be the smartest choice

 

<{POST_SNAPBACK}>

 

 

 

A smaller pulley is an underdrive pulley and that will make the alternator spin less rpm's at the engines idle speed.

Most highter output factory alternators will not have any more output at idle, but they will in the upper rpm's.

[BBSilverado]

Okay so I am running a very intense sound system in my Bravada and have came to the point where my headlights are dimming only at idel with my system going.  Now since i did an HID conversion I'm worried about damaging them.

 

So basically I'm curious to if there is an overdrive pulley available for our alternators in order to speed up the RPM at idle?

 

<{POST_SNAPBACK}>

 

 

 

You may need to add some capacitors to your amp's power feed. I would recommend at least a .5 Farad cap for every 500 watts total output.(the larger the cap the more affect it will have)

I don't know of any overdrive pulley for the stock alternator, but you might check the pulley on the diesel alternators, they may be a little bigger diameter.

[PeterbiltChrome]

BBSilverado, you are soooo wrong about the pulley ratio~ the alternator is the DRIVEN pulley... I'm gonna have to school ya about the basics

 

lets review:

 

crank pulley= driver

alternator pulley = driven

 

I'll put it in kid terms for you...lets say the big pulley is 18" in circumference and the little pulley is 6".

 

the big pulley spins the small pulley more times around because the small one has to spin 3 times to the 1 of the big pulley. If I used your logic and increase the size of the driven pulley, say to 9", i would now see that it spins 2 times for every 1 of the big pulley. -------> you slowed the alternator down, good job! you've done the complete opposite of what we are trying to accomplish, which is speed the alternator up. Make the little pulley 3" and it will spin six times to every one of the 18" crank.

 

Have either of you ever ridden a bicycle and looked at the gear sizes?