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Message: <blockquote data-quote="JerZeyStangz" data-source="post: 1398072" data-attributes="member: 8031">Great perspective, and showing two different scenarios. I have premium mustang GT with power everything and Mach 460 stereo system. I believe the electrical system is at full capacity like you stated. I am going to try this 12 dollar pulley fix and see if I can have my cake and eat it too. I learned a great deal about the charging systems in our cars and confident to find another solution. The alternator is 100-105 amp unit and the reason why some people have charging issues and others don't is based on how powerful there alternator is from factory. I know the newer GTs have 110Amp alternators which is why they don't notice any effects at idle. The factory designs the pulley system to be 3:1 ratio to run the electronics without hiccup. What the racing pulleys do is bring this ratio down 1:75:1 so there is enough charging for the staging lanes when your about to race. There is a simple formula to get this ratio is dividing the crank pulley size by alternator size. And to get proper charging capacity you need to multiply by RPM to get alternator RPM output. 6" crank/2" alternator pulley = 3 * 800rpm idle which is 2400rpms. The 2400 RPMS is how fast the alternator is spinning at idle.Since my car has a low idle because it's a automatic it spins at 500-600rpms. This bring my alternator RPMS by 1500-1800rpms. I just need to find a proper pulley that can give me that sweet spot ratio close to 3:1, 2.5:1 would be ideal and that's what 1.9" pulley will do. I'm going to test it out and see if it works. If it doesn't, I will go back to stock and get rid of my pulleys. I just love them for gas savings and pep of the engine right now. Sent from my iPhone using Tapatalk</blockquote>