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Thread: Need help designing system

  1. #1
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    Need help designing system

    Hey,

    I am totally new to the whole car PC scene as well as car installations. I have spent the past few weeks lurking the forums trying to learn as much as I can and as I understand its not good to be spoon fed around here. I hope the research I have done is obvious (or good enough ahaha). But I still have a bit to learn and have become a bit stuck with the design.

    To get things cracking, here is the PC I plan to run. It will be used for music, GPS, DVD's, voice recognition and if the PSU allows OBDII, TV streaming and maybe that cool accelometer thingo.

    Please criticise anything and everything wrong with my system as I would much rather pick out problems in the early stages.

    PC
    Mobo: Jetway Mini-ITX 2GHZ
    HDD: 160GB
    RAM: 1GB PC4200 DDR2 533
    PSU: M2-ATX (160watt)
    Drive: some brand name optical drive
    Case: VoomPC-2
    Monitor:Lilliput 7" VGA touch screen
    Misc items: GPS receiver, microphone


    I wont list what I have planned for the sound as I am still researching that.

    Question Is the M2-ATX sufficient to power all the above comfortably?

    The part I am still struggling with is the wiring. I have never installed an amp, audio or any type of electronic accessory in a car before. Well I believe I have figured out the correct way of wiring just have no clue as to what type of wires I should be using. I have attached a quick thing I bunged up in paint with the assistance of diagrams posted by many on these forums.


    I understand that most of the posters are in the US and use the AWG method to describe wires, dunno if use the same in Australia...but I'll stick with it.

    From what I have read on the forums, I can use wire that is overkill but it wont fry the system because the system will only draw the current that it needs (but I'd prefer not to overkill). Also the fuse I chose depends on the wire that is being used. So I have colour (color :P) coded the wires in the hope that you guys can recommend the appropriate AWG sizes for each colour.

    As a starter I believe that Red = 4awg, orange = 10awg.

    So if could get a hand with the colours:

    RED
    ORANGE
    YELLOW
    GREEN
    PURPLE
    BROWN



    Edit - sorry forgot to ground the monitor in the wiring diagram.
    Attached Images Attached Images  

  2. #2
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    Yellow and green carry almost no load at all. 18 AWG or so will be just fine. Regular "hook up" wire from the electronics stores will work.

    Purple - not a whole lot of load, but either match what comes with the monitor or go one size bigger.

    Brown - Go big. 8 AWG or so.

    Orange - I'd go one size larger, 8 AWG rather than 10 just to be conservative.

    The following FAQ gives a guide to how to pick wire gauges and why.
    http://www.mp3car.com/vbulletin/advf...iew&advfaqid=5
    Quote Originally Posted by ghettocruzer View Post
    I was gung ho on building a PC [until] just recently. However, between my new phone having internet and GPS and all...and this kit...Im starting to have trouble justfiying it haha.
    Want to:
    -Find out about the new iBug iPad install?
    -Find out about carPC's in just 5 minutes? View the Car PC 101 video

  3. #3
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    Thanks for the reply bugbyte.

    Just wondering would this be right?

    From the 4AG cable comming from the battery I run this fuse: clicky. Its rated at 100amps but I dont think a 120amp fuse is necessary.

    Then I run the 4AG wire into a distribution box and split it into two 8AG wires: distribution box. Now this distribution box can house 2 fuses so I will put in two fuses that are appropriate for the 8AG wires.

    Slight problem though. The wires we seem to have are AG instead of AWG. Not a massive difference in size: 8AWG wire diameter = 3.264mm (1.3inches) and 8AG wire diameter = 4.05mm (1.6inches). I guess this shouldnt make a massive difference?

  4. #4
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    The size of the wire going from the battery to the rear of the vehicle will be almost entirely dependent on what amplifier(s) you will have. The load of the computer will be negligible compared to the load the amps will put on your electrical system.

    Also, when running that big fat wire from the battery to the back, it's best to go with wire that is larger than you need, so you have enough capacity to upgrade your amps later, without having to rerun the wire. Rerunning that wire is a *****!

    So, what amp(s) are you thinking about?

  5. #5
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    Quote Originally Posted by Dilan View Post
    Thanks for the reply bugbyte.

    Just wondering would this be right?

    From the 4AG cable comming from the battery I run this fuse: clicky. Its rated at 100amps but I dont think a 120amp fuse is necessary.

    Then I run the 4AG wire into a distribution box and split it into two 8AG wires: distribution box. Now this distribution box can house 2 fuses so I will put in two fuses that are appropriate for the 8AG wires.

    Slight problem though. The wires we seem to have are AG instead of AWG. Not a massive difference in size: 8AWG wire diameter = 3.264mm (1.3inches) and 8AG wire diameter = 4.05mm (1.6inches). I guess this shouldnt make a massive difference?
    Sounds good. If you are going to run your amps off of that same wire, a fuse that big is fine. If not, put a much smaller one like 50 amps, depending on the overall draw of the system.

    The first (big) fuse protects the main power wire before it gets to the distro block. If it shorts and isn't fused, you get a fire in the engine compartment.

    The second fuse in the distro block protects the power supply and computer.

    I don't *think* the wire gauge differences will be a problem.
    Quote Originally Posted by ghettocruzer View Post
    I was gung ho on building a PC [until] just recently. However, between my new phone having internet and GPS and all...and this kit...Im starting to have trouble justfiying it haha.
    Want to:
    -Find out about the new iBug iPad install?
    -Find out about carPC's in just 5 minutes? View the Car PC 101 video

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