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I went ahead and put on the AP Pulley today, and it took a while to get the crank bolts on and off, but otherwise went ok. Belts were tightened properly the first time around and all. Car shuddered a bit at first, and threw a CEL, but after resetting the ECU with the AP and driving around a little it seems fine. It feels like the car is more responsive in the lower revs, with a little more punch up top. Also seems to have smoothed out the AC cycling a bit.
I went ahead and data logged the voltage before and after, at idle and cruise, to try and clarify what exactly under-driving the alternator does to the voltage. Basically, in stock trim w/ nav, it had no effect on voltage cruising, or at idle with nothing extra turned on. Where I did see a drop in voltage compared to stock was when idling with everything turned on. Normally the voltage would sit around 13.8-13.9 for me, but with the pulley installed I now see 12.3-12.4 in this scenario. So there isn't any wiggle room left for aftermarket stereos, etc, at that point. There wasn't any flickering or weird happenings at this voltage for me in stock form though. Otherwise, I didn't notice any difference in the AC, but it was 75F outside so I don't think I will be able to tell until it's warmer.
I've attached my voltage graphs below.
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__________________ 2004 RX-8: BB MT GT - Engine #3 Mods: Mazdaspeed CAI, Tanabe SMH Exhaust, AP Pulley, Cobb Accessport, Progress Tech F+R Sways, EVO-R Endlinks, Nav DELETE, RB Oil Cooler Screens, OEM AC Condenser Screen, Lotek Pod w/ Autometer Gauges.
Last edited by Jasonawojo; 01-18-2009 at 01:06 AM.
my pulley kit has the most underdriven crank pulley, but they also supply a smaller than stock sized alt pulley, so the alt isn't underdriven. best of both worlds, and if you decide you want to underdrive the alt too, just install the oem pulley there.