dirtbag

iTrader: (2)

Anyone have issues with the the battery charging correctly after installing an underdrive pulley with a big stereo? I have 2600w of amps and an optima battery with a new alternator, but am afraid the battery will not be getting a good enough charge due to the slow spinning alternator. I do have a capacitor but it only helps so much when you are running a few thousand watts...

Marc3.4V6

iTrader: (1)

You need an overdrive alternator pulley.

99Bluz28

iTrader: (35)

Does your car have a M6 or A4 transmission, and is the amplifier 2600rms or max/peak power?

dirtbag

iTrader: (2)

Overdrive alternator pulley... K.

Car is an M6 and 2600 is the peak number.

Undertow74

iTrader: (45)

i have no problems with my system and i have a 25% UD pulley. and i have 4 amps
(1 for front speakers, 1 for rear, then 1 for each sub) I also have a 6 farad capacitor and a higher amp alternator. No overdrive pulleys needed for me.

99Bluz28

iTrader: (35)

IMO, if only peak then do the Big 3, and if needed bump the idle speed up.

dirtbag

iTrader: (2)

This car has the "big 3" already done . Just trying to eek out every whp I can. I'll just skip the UDP for now and save it for another time.

JakeFusion

iTrader: (7)

I have an overdrive pulley on my power bastards 220a alternator. Not really needed, but yeah. Works well.