2 volt and rpm drop when subs hit
Printed From: the12volt.com
Forum Name: Car Audio
Forum Discription: Car Stereos, Amplifiers, Crossovers, Processors, Speakers, Subwoofers, etc.
URL: https://www.the12volt.com/installbay/forum_posts.asp?tid=28546
Printed Date: July 19, 2025 at 2:19 AM
Topic: 2 volt and rpm drop when subs hit
Posted By: bigt_45
Subject: 2 volt and rpm drop when subs hit
Date Posted: March 17, 2004 at 9:25 AM
I have a 2002 acura rsx. I have a 2400 watt amp and a 2.2 farad capacitor pushing 2 12inch kicker l7. I am reading about a 2 volt drop on the capacitor when the bass hits good. Also, my rpm's drop a few hundred when my car is in idle and the bass hits good. Do i need a new high powered alternator? Do i need a new high powered battery? If so, what is a good one to get and how much will it cost.
Replies:
Posted By: jugga-nemo
Date Posted: March 17, 2004 at 10:39 AM
Definitly a new alt. I would recommend a Stinger 200amp alt (just to be safe) but a 150amps should be enough. If you add another battery, the OEM alt won't be able to charge both because it's not powerful enough.
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5.25" Components & 5x7 Coax Kappas w/Power Acoustik OV4-800
KAC 7252 powering 2 D3 8" Diamonds
KDC-MP728, KGC-4042A
Posted By: lspker
Date Posted: March 17, 2004 at 9:22 PM
Definitly increase your power supply. You need more reserve capacity. Bigger alt will help, but as you mentioned your motor looses rpm under the bass load. This is caused by the alt being under heavy load and the motor not having enough horespower to maintain rpm. Beef up the batteries.
Posted By: flatulatta
Date Posted: March 21, 2004 at 12:56 PM
wait y would his rpms drop from a drastic volatage drop??? would the rpms increase to help the alt charge the battery quickly?
Posted By: xetmes
Date Posted: March 21, 2004 at 1:14 PM
the rpm drop is due to the load the alternator is placing on the engine when the current draw is too great...
Posted By: DYohn
Date Posted: March 21, 2004 at 2:07 PM
lspker wrote:
Definitly increase your power supply. You need more reserve capacity. Bigger alt will help, but as you mentioned your motor looses rpm under the bass load. This is caused by the alt being under heavy load and the motor not having enough horespower to maintain rpm. Beef up the batteries.
No, he needs a high-output alternator, not batteries. Batteries and caps will not help in this situation. It has absolutley nothing to do with engine horsepower.
Posted By: Clean Install
Date Posted: March 22, 2004 at 8:08 PM
You want to get a HO alt., all extra bats and caps do is place a larger work load on your alt. ------------- If we learn from each success and
each failure, then we can improve ourselves
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