How can I run underdrive pulleys with a big stereo? - TCCoA Forums
 
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post #1 of 10 (permalink) Old 07-22-2002, 04:15 PM Thread Starter
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Question How can I run underdrive pulleys with a big stereo?

Is there a way to run them with out going through batteries / alternators?

Brian Macfadden
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post #2 of 10 (permalink) Old 07-22-2002, 04:29 PM
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I am running...

...ASP underdrive pullies right now. How big are you going to go? I do not have any problems with charging. I do get the needle twitch on my volt gauge, but other than that, I have not experienced any problems.

I have two amps...
JBL 1200.1 and JBL 80.4


I have two Bostwick 12's


Again, I dont know how big you want to go, but I am not experiencing any problems ::knocking on wood::!!!

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post #3 of 10 (permalink) Old 07-22-2002, 04:40 PM Thread Starter
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when I am rolling with my stereo going (hard) and A/C I'm right at 14 amps but at night when you add the head lights it goes down to 12.5.

Are you running your amps at 2 Ohms or 4 Ohms?

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post #4 of 10 (permalink) Old 07-22-2002, 04:45 PM
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Well...

...I am not a stereo guru. The amp that drives the subs is a JBL 1200.1 (1 channel x 1200w), and the amp that drives the front speakers is the JBL 80.4 (4 channel x 80w). Your setup looks sweet! Yours looks much cleaner than mine! Nice job.


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post #5 of 10 (permalink) Old 07-22-2002, 04:54 PM Thread Starter
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Well if the amps are at 4 Ohms they are 600.1 and 40.4 but if they’re at 2 Ohms than they are 1200.1 and 80.4. 1200 watts sounds like a lot for the 2 subs you have so I’m guessing your running them at 4 Ohms.

As far for my install THANKS but all I did was give my installer a lot of my paychecks
.
From JBL's Web Site
Specifications
Output 4 Ohms: 600W x 1
Output 2 Ohms: 1200W x 1
Signal-to-Noise (dBA): >100
Frequency Response (±3dB): 20Hz - 500Hz
Total Harmonic Distortion: 0.1%
Input Sensitivity: 250mV - 4V

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post #6 of 10 (permalink) Old 07-22-2002, 05:30 PM
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That's good to know. My system isn't going to be even half as nutty as that... hehe.

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post #7 of 10 (permalink) Old 07-22-2002, 11:23 PM
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Well I had March Underdrive pulleys, Anytime I turned ac on or lights the voltage would drop down to 12's, I installed a sub and realized that I won't have enough juice to run ac and the sub at the same time. So pulled them off, after a few weeks I took the sub out. Now I'm planning on putting them back in (there is noticable power at highway speed, when you punch it the car increases speed faster).

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post #8 of 10 (permalink) Old 07-23-2002, 02:54 PM
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I had ASP's on my Thunderbird and they did really well. I didn't have a system in the car but I didn't experience any charging problems. ASP's are supposedly one of the better brands to buy if you have a system because they alternator pulley isn't as large as some brands. The pulleys on my Mustang are a different story. HAHAHA This thing dims like a mother at idle.

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post #9 of 10 (permalink) Old 07-23-2002, 10:03 PM
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i have a RF power 1500.1 that is sheeted at 1698 watts, and i have a RF power 360.2 that is sheeted at 482 watts. those are RMS numbers. i have FRPP underdrives, a stinger deep cycle in the trunk, and stock alternator at 130 amps. i have no problems at all. when i'm at idle, and pounding it, i do see the autometer gauge i have installed bounce from >14 to around 12 volts. but its an instantaneous thing. even at night with the lights on, its aroudn 13 volts or so. the underdrive pulley is not that much larger than the stock pulley, they make most of it up on the crank and water pump. there should be no worries with them.

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post #10 of 10 (permalink) Old 07-23-2002, 10:23 PM Thread Starter
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COOL thanks guys

Now the new question

Brian Macfadden
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