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Thread: opus resistor for low power cutoff?

  1. #1
    Maximum Bitrate 00CericaRuss's Avatar
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    opus resistor for low power cutoff?

    anyone change this resistor to one that will let your computer run at a lower voltage?

    I have an underdriven alt. pulley in my car, and my computer goes into standby when i'm sitting at a light w/too much bass running.

    my options as i can see at the moment are:
    - change resistor and hope it works
    - get capacitor for computer to have more steady power
    - put stock alt. pulley back in
    Car: 2000 Toyota Celica GT-S
    Mods: Yep
    Carputer: VIA M9000 | Opus 150 | 512MB PC2100 | 60GB Notebook HD | Slim/Slot DVD/CDRW | Audigy2NX | Xenarc 700TSV | (2) DSCustoms DS700HRS (in trunk) | SMC USB 802.11b | CoPilot | DLink FM tuner | Cliffnet

  2. #2
    Variable Bitrate Cherub211's Avatar
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    I would put the stock alternator pully back on. You need more electrical power, and the only way you are going to be able to do that is take it from your engine. It's not like you're going to lose all that much HP. Changing the resistor won't help.

  3. #3
    Variable Bitrate Sh0cker's Avatar
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    Quote Originally Posted by Cherub211
    I would put the stock alternator pully back on. You need more electrical power, and the only way you are going to be able to do that is take it from your engine. It's not like you're going to lose all that much HP. Changing the resistor won't help.
    As he said put better alt. back on...if you worry about your HP/speed you should consider driving without extra weight - subs
    Danny.

    "If today was perfect, there would be no need for tomorrow."
    My Car Project® ‹== !10.4" Allbrite, touchscreen, epia, 150opus, gps, wireless, sony remote [old] 128x64 Crystalfontz +double din [new]

  4. #4
    Maximum Bitrate 00CericaRuss's Avatar
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    meh.. i just don't want to have to pull the pulley out

    but does anybody know of this resistor i speak of?
    Car: 2000 Toyota Celica GT-S
    Mods: Yep
    Carputer: VIA M9000 | Opus 150 | 512MB PC2100 | 60GB Notebook HD | Slim/Slot DVD/CDRW | Audigy2NX | Xenarc 700TSV | (2) DSCustoms DS700HRS (in trunk) | SMC USB 802.11b | CoPilot | DLink FM tuner | Cliffnet

  5. #5
    Variable Bitrate Cherub211's Avatar
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    If you arn't willing to pull the pully off, go get one of those big @$$ capacitors they sell for audio applications. I would try to do everything else before I change a resistor on something as complicated and expensive as an Opus.

  6. #6
    Constant Bitrate P4_2.66GHz's Avatar
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    If your system goes into standby, it means you are running below 11 Volts. Your battery will not last long. Opus goes into standby if voltage drop exists for 10 seconds or more. No capacitor will help.

  7. #7
    Variable Bitrate Cherub211's Avatar
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    It will, by supplying the exta voltage for the required time of sitting at a light. What do you know about electronics?

  8. #8
    Constant Bitrate P4_2.66GHz's Avatar
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    Quote Originally Posted by Cherub211
    It will, by supplying the exta voltage for the required time of sitting at a light. What do you know about electronics?
    I know a bit about electronics.

    Battery in its normal charged state should be 12.3 Volts.
    Anything below is damaging.
    Alternator supplies 14.1-14.5 Volts to charge the battery.
    Opus power supply cuts the power off if your voltage drops below 11 volts for longer than 10 seconds.

    Conclusion:
    The only way you would achieve the needed result that is to run your alternator in normal mode.

  9. #9
    Variable Bitrate Cherub211's Avatar
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    What you said there was true, but a capacitor (and I'm talking .5-1 farads) would hold the voltage high for the computer to remain on while at a red light.

  10. #10
    Constant Bitrate P4_2.66GHz's Avatar
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    Quote Originally Posted by Cherub211
    What you said there was true, but a capacitor (and I'm talking .5-1 farads) would hold the voltage high for the computer to remain on while at a red light.
    It will not hold it long enough!
    BatCap would be a better solution than a reqular capacitor. Still, if he is running below 12V, his battery is taking a big hit. No capacitor can help there.

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