Rick Griffin Posted February 1, 2016 Report Share Posted February 1, 2016 I got a good deal on a FI sp4 15 and have a 170 amp stock alt in my 06 bmw. Would like to start with stock alt for a while, just need suggestions on what amp I can use to push it. Bear in mind, 170 amp stock alt, I was thinking a good 2500 watt rms amp would push it ok with a battery upgrade. Opinions and options would be helpful. Link to comment Share on other sites More sharing options...
Mr DeeBeez Posted February 1, 2016 Report Share Posted February 1, 2016 Sq 2200. I have mine on a sq3500, but the 2200 would push it pretty nicely. Shouldn't need a ho alt, but make sure you do big 3 Fi Team 18's (4) Crossfire 16k Crossfire 400.4 & 800.4 Pioneer AVH-X491bhs 140ah cmax CES 320's (2) Link to comment Share on other sites More sharing options...
Rick Griffin Posted February 1, 2016 Author Report Share Posted February 1, 2016 Sq 2200. I have mine on a sq3500, but the 2200 would push it pretty nicely. Shouldn't need a ho alt, but make sure you do big 3 Thats what I was thinking, that or a dd m3c. What about a batt though, 1 extra batt in the back should be ok right? xs 3100? Link to comment Share on other sites More sharing options...
Mr DeeBeez Posted February 1, 2016 Report Share Posted February 1, 2016 I had my 3500 in my blazer with stock alt, d3100 up front and xp3000 and I was able to hold low 12's. A 2200 should be ok with a d3100 in back. Is your sp4 a d1 or d2? Fi Team 18's (4) Crossfire 16k Crossfire 400.4 & 800.4 Pioneer AVH-X491bhs 140ah cmax CES 320's (2) Link to comment Share on other sites More sharing options...
Rick Griffin Posted February 1, 2016 Author Report Share Posted February 1, 2016 D2 Link to comment Share on other sites More sharing options...
Guest Posted February 1, 2016 Report Share Posted February 1, 2016 I have crescendo encore 4.5k with 2 extra batts in the back on D1 SP4 15", no light dimming no voltage struggling factory alt, no big3, 3 runs of 1/0 going from my (-) rear batts to the metal ground @2ohm it does 2,734 watts on the SMD amp dyno If I ever wanted to go 1ohm or lower it would require alot more electrical so I like 2ohm for now and 2.7k is good for the SP4 The only highoutput alternator for my SUV is $800 from DC power I had a crescendo bc2000 @.5ohm in my mustang on this sub with 2 extra batts in the back and 250amp mechman alt never went below 12.8V Link to comment Share on other sites More sharing options...
Rick Griffin Posted February 1, 2016 Author Report Share Posted February 1, 2016 you have a D2 ohm sub wired at 2 ohms? Link to comment Share on other sites More sharing options...
Guest Posted February 1, 2016 Report Share Posted February 1, 2016 you have a D2 ohm sub wired at 2 ohms? sorry I meant I have a D1 @2ohm Link to comment Share on other sites More sharing options...
SLYentist Posted February 1, 2016 Report Share Posted February 1, 2016 i imagine that the alternator is that large for a reason. it doesn't make sense for BMW to put in a higher output alt than what's required, from a economic and reliability standpoint. I wouldn't put an huge amp on it, just because it's a 170 amp. The stock electronics in 04+ BMWs is pretty substantial. Cables and wires almost never fail; the terminations do. Link to comment Share on other sites More sharing options...
Rick Griffin Posted February 2, 2016 Author Report Share Posted February 2, 2016 I agree, thats why I was asking about how much power, with big 3 and and extra battery, about how much power or size of an amp I might be able to run without significant drop? I was thinking an aq2200d or possibly a saz 3000d but I dont know if that will be too much. Link to comment Share on other sites More sharing options...
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