how important is a capicator.? - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


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Old 12-20-2007, 06:18 PM   #1
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Default how important is a capicator.?

want everyone'* suggestions.. im gonna be running my same system in my 95 that i had im ny 88 sse.. but i never used a cap.. i will be running 2 15'' kicker dual 2 ohm L7 subs with 2 kicker sx1250.1 amp'* with a 80 amp isolator and 2 batery'* ( 850 cranking amps and 1000 cold cranking amp'*) each battery... i never had a problem with anything shutting off or my amps going into low voltage but i want to know if i should use some caps for the install on the 95 se.? oh and its a 140 amp alternator..

use caps or not.?
will it give me more power and volume.?

thanks guys...
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Old 12-20-2007, 07:11 PM   #2
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ur extra battery will help with capacitance. but from my experiance, the biggest difference will be in the alternator. and even tho that is a 140 amp alt, it WILL NOT have that much putput. that is max rated output. it will actually put out 70% of that. so it will be about 100 amps effective. i would suggest a rebuild to boost the ampherage output. that will provide the most difference in your draw on other electronics.
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Old 12-22-2007, 05:38 AM   #3
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You should at least get a smaller alternator pulley to see if you can charge up everything a lot sooner. It should help the car keep running just fine with a bit heavier power draws.
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Old 12-22-2007, 07:37 AM   #4
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Our alternator, just lilke our old S1'*, don't like to spin too fast as they are.

Best bet is to find an Iceberg kit and do some upgrading to that alternator
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Old 12-22-2007, 11:09 AM   #5
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Quote:
Originally Posted by sandrock
Our alternator, just lilke our old S1'*, don't like to spin too fast as they are.

Best bet is to find an Iceberg kit and do some upgrading to that alternator
where would i find an iceberg kit.? and what amp'* would my alternator push out with the kit.. its a 140 amp now..
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Old 12-22-2007, 12:10 PM   #6
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are those kicker amps 1250 watts rms or max?
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Old 12-22-2007, 01:14 PM   #7
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Kickers are rated at RMS. What you see as the designation on those amps, are the RMS watts
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Old 12-23-2007, 01:39 PM   #8
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Quote:
Originally Posted by sandrock
Kickers are rated at RMS. What you see as the designation on those amps, are the RMS watts
so going by p=i/e, thats like 180 amps, i think. its been like 5 years since ive used that.



**edit**, but actually, i once used a clamp on amp meter, and my system was drawing a peak of 90 amps. and i have 2000 watts of rms.
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Old 12-23-2007, 05:08 PM   #9
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Quote:
Originally Posted by sandrock
Kickers are rated at RMS. What you see as the designation on those amps, are the RMS watts
those amps are rated at rms IF you have the amount of current to supply the "rated" power at their rated voltage (some rate at 12 volts , while others rate at 14.4). starve the amp of current and you will never reach rated rms power.

keep in mind you have to figure in efficiency when you want to know how much current you amp wants to reach "rated" power.

since it'* a class d amp, efficiency is going to be about 80%, depending on design
.

1250/.80=1562.5 (its going to take 1564 watts for this amp to make 1250)
1562.5/14.4=108.5

so what this tells us is that for your amp to produce its 1250 watts, you will need at least 108.5 amps of current and you have to have it running on 14.4 volts, which is supplied while the car is running.

dont go with a capacitor, get your current supply up man!
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Old 12-28-2007, 02:09 PM   #10
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Quote:
Originally Posted by samueljackson
are those kicker amps 1250 watts rms or max?
there actuall 1347 watts rms each.. i have the birth sheets..... each one has been upgraded by kicker each time a new upgrade is available...
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