6berry Posted July 23, 2011 Report Share Posted July 23, 2011 with only a 270 amp alt your system would be pulling a lot out of the batteries. with a system that requires 362 amps as you said plus the car needing around 40-50 amps so you have around 400 amps of draw or more. youll get pretty bad voltage drop from your batteries because the alt cant keep up with that at full rpm. plus that alternator probably only puts out 100-150 at idle so your pulling even more from the batteries then Quote 1999 Audi A4 1.8T::: 4 - DC Level 3 10's in a 4th order Rockford P6002 on Subs for now (3-3.5k coming eventually) MB Quart ONX4.60 for Mids and Highs Boston S50 Components in Front Boston S65 Coaxials in Rear 40 Sq Ft of Second Skin Damplifier Build Thread UBL 1948 Plymouth Link to comment Share on other sites More sharing options...
merk_master Posted July 23, 2011 Author Report Share Posted July 23, 2011 well 3k rms at 13.8 volts is 217 amps which would leave roughly 50 -60 amps for rest of the car ... stock alt is 80-100 amps a car uses roughly 60-70% of capacity so 60 to 70 amps would be for the car .that would leave me drawing 10 to 20 amps over output . I plan on a overdrive pully to get full output as close to idle as i can Quote hopeful noob Link to comment Share on other sites More sharing options...
Craig28 Posted July 23, 2011 Report Share Posted July 23, 2011 with only a 270 amp alt your system would be pulling a lot out of the batteries. with a system that requires 362 amps as you said plus the car needing around 40-50 amps so you have around 400 amps of draw or more. youll get pretty bad voltage drop from your batteries because the alt cant keep up with that at full rpm. plus that alternator probably only puts out 100-150 at idle so your pulling even more from the batteries then the dc 270 xp is 200+ at idle. he could do always try it Quote TEAM DC Everything is a 150 on th earometer Well I guess punching a woman is a good way to test your strength! You never know how strong you are until you cold-cock a woman in the head and break that bitches jaw. Next time she tries to punch you in the stomach, whip your wiener out and chase her around. Show her who's boss. AlphaDamp CLD Mat - Get more sound deadening using less sound deadener Link to comment Share on other sites More sharing options...
merk_master Posted July 23, 2011 Author Report Share Posted July 23, 2011 Bump for plausibility of 3000 rms? Quote hopeful noob Link to comment Share on other sites More sharing options...
optical Posted July 23, 2011 Report Share Posted July 23, 2011 (edited) yes h/o alt big batt up front and 2 nice batts in back and let er rip on 3k with big 3 and all zero gauage of course Edited July 23, 2011 by optical Quote Link to comment Share on other sites More sharing options...
Tarball Posted July 23, 2011 Report Share Posted July 23, 2011 Bump for plausibility of 3000 rms? you should be fine with 3kRMS and the BEST (amps at idle) alt you can get. Also, don't get cheap powerwire. But you wont be drawing peak amps all the time unless you plan on driing around with a 30hz test tone playing full tilt. Quote CURRENT SYSTEM: Alternator: Stock alt on mids/highs Isolated DC Power 270 SP - Charging @ 16.8v Batteries: (2) XS D1400s Power Cable: Double Runs of 1/0 KNU Kolossus Fleks Headunit: 80-PRS Sub Amp: DC 5.0k Subwoofers: 2 RE MT 15s /PSI dual .7ohm recones Subwoofer Enclosure: 9.1cubes @ 32hz - brutal. Mids & Highs Amp: CT125.4 Active Components: Mids RE XXX 6.5c Highs - 3 RE XXX tweeters per side(A pillar) Noise Control: Damplifier Pro all over the cab. Build Log If you do business with me please leave feedback here: FEEDBACK THREAD Highest Legal Score: 151.0 db Highest Musical 30 Second Average: 151.6 db Link to comment Share on other sites More sharing options...
merk_master Posted July 23, 2011 Author Report Share Posted July 23, 2011 ALRIGHT COOL THANKS GUYS Quote hopeful noob Link to comment Share on other sites More sharing options...
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