1993 E36 325i electrical questions, speedo, rev counter

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  1. 1993 E36 325i electrical questions, speedo, rev counter 
    #1
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    Right here goes... bit of a strange set of questions

    I've aquired a set of Astra GTE digital clocks and i'm attempting to fit them to the E36 to see what they look like. I know this won't be to everyones taste, but i like them and would love to get them working

    I've trawled the net, getting wiring diagrams together etc..

    just test fitting them now with scotchloks just to see if i can get them working

    Hooked the clocks up to some power, they light up and run through the test sequence as they should

    I've hooked the rev counter and speedo up and have a couple of issues:

    Rev counter: Reads about 50% more than it should. I expected this due to the E36 being a 6 pot and the astra only a 4. Would it be possible to put an inline resistor in to drop the reading to where it should be?

    Speedo: Hooked up to the correct wire, when i'm doing 20, it's reading 8 on the clocks. I believe that the E36 speed sensor is mounted on the back of the diff. I have the Astra transducer, but wouldn't know how to splice them together!! Do you think a small bit of ciruit board with the ability to adjust and amplify the E36 signal would help? Then with a bit of setting up, the signal would match what the clocks need?

    Obviously, there will be some other issues regarding oil pressure signal, fuel gauge may need a resistor or amplifier, but if the speedo and rev counter work, i'm sure i could figure the rest out

    Any input would be appreciated


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    RPM signal is from frequency, so you can't just add a resistor etc, similar with the speedo sender, the astra one will be in the gearbox, and the BMW one is in the diff, and they are both counting rotating teeth.
    In this case, there is a different number of teeth.
     
     

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    So, do you think that it's not possible to do?


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    It should be possible, but it would need some electronics.

    a certain frequency in would output a lower frequency on the other side.
    Possible, but it's just finding them
     
     

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    Any idea how i would find the frequencies?

    What kind of electronics are we talking about? I just need some idea of what i'm talking about when i ask the bloke i know who's good at stuff like that


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    well, for the tacho, you'd need to lop 1/3rd off the frequency, 3 ignition pulses for each revolution of a 6cyl, compared to 2 ignition pulses from a 4cyl.

    For the speedo, it'll be more trial and error.
     
     

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    Cheers Enda

    Much appreciated. I'll ask the bloke i know who's good with electronics to see if he has any ideas. i'll possibly find an electronics forum and ask a question on there

    Can you see any issue in getting the other functions working correctly?

    Fuel level and warning light
    Oil pressure
    Temp reading
    Voltmeter

    I've figured out all the warning lights that are on there, they were easy enough


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    I had an issue with my old Ford Mondeo, and the speedo would tell me I was doing 30mph, but I was actually doing 60mph. Nobody on the forums could tell me what was going wrong... Tried new VSS's, speedo's etc etc and still couldn't solve it...

    ANYWAY, my point is, I had to find something to convert/amplify the frequency, and manged to do it (It took about 3 weeks of searching to find it), the circuitry even had button's for fine adjustment too. IIRC, I maxed out the speedo, and was only doing about 10mph Worked a treat - Maybe it could work for you !

    I'll have a trawl through the Mondeo forums and see if I can dig up where I bought the device from.

    Ferret !
     
     

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    Temp sensor most likely will work straight out of the box, Oil pressure - you'll need a pressure sender (at the moment you only have an "idiot light" pressure switch)

    Voltmeter will work fine, fuel gauge - who knows.. that will be based on voltage/resistance so maybe it'll work, maybe it won't. Most sensors work on 0-5v as min to max, so it'll probably be close.
     
     

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    I can't find a link to the circuit board that you need on the Mondeo forums - So i'm going to have to Google it, but it's gonna take a while, because I can't remember exactly what it's called !

    If you haven't heard owt from me in a day or so, nudge me, I have a tendancy to forget !
     
     

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