I want to install pulies in my car, but I am worried about charging problems when I use my stock mach 460 or anything else I put in there.

Do I really have to worry? How much juice will I lose?

 

no

 

I have U/D pullies on my stang, but only on the crank and the water pump. I was told NOT to put one on the alternator.

 

if you have a decent size stereo in your car i wouldnt use underdrive pulleys.

 

Buy a bigger alternator.

 

Buying a bigger alternator wont help. Installing a better battery will. The biggest problem with be a low output from the alternator at and idle. This means when idling any access amprage needed will be off the battery. It does also depend on the amperage draw from your system. But putting in a better battery will make the battery stay up on voltage even when your electrical system draws from it.

However if your a person that sits and idles for extreme periods of time with a higher then normal amperage requirement i wouldnt recomend it. But since your looking at pullies I feel safe in assuming the engine will be spinning higher speeds more often then not.

 

I have been in the Audio business for over 15yrs. I currently own my own stereo shop. I have seen several situations where equipment damage has accured due to pullies put on the alternator. High powered amplifiers draw serious current, if this current is not stable, it will burn up the power supply in the amp. (it will cause the amplifer to run hotter than normal, with voltage flux) Installing a bigger battery will help, but not fix the problem. By installing a bigger battery, you are only giving the amplifier or whatever you install a larger reserve, it will still take longer for that alternator to charge that battery back up to full capacity.

 

for bigdaddys69 theory there has to be other factors as well. A bad ground, weak battery, other factors. A normal (good) amp will not "burn up" when at 12v which is what happens when you over run your alternator. Only if the battery is weak or is not properly getting to the amp will it cause the potential at the amp to drop below 12v. Also all the (good) amps have a thermal shut down for when they become to hot.

 

I have UnderDrive pullies on my 01 Gt and have not seen any problem with my stereo. I am running 3 Optima batteries(one up front and 2 in the rear) and one 50 Farad Cap. For amps I have 4 RF BD1000s and a RF Power750X. I can hammer this sytems all day long at an idle and have had no problems.

 

So someone... like, say, me... with 2 amps, a 1-farad cap, 2 10" DVC subs, 2 6x8's in back and components/crossovers in the doors should probably stay away from pulleys?