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    20v blacktop wiring help

    Hi all, new to the forum and glad to see a 4age section.I am putting a 20v blacktop engine into a bmw e30 rallysprint car, im going to use the standard ignition system and loom. The fact im using a complete and standard loom and ecu should make things straight forward for me but im looking for some help to wire the ignition barrel plug like which wires are to power igniter,coil,starter relay and so on??? cheers...Liam

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    Re: 20v blacktop wiring help

    Hi,

    Wiring up a standard blacktop is easy. Im at work at the moment but when I get home later I will dig out the file with my notes and post some stuff up.

    I assume you have a complete wiring loom to start with including a map sensor, coil, igniter, air temp sensor and fuse box?

    The standard loom has a lot of wires in it that simply just isnt needed for your application and the biggest point to bear in mind is in a corolla BZR, the wiring is intergrated into loads of other circuits which just confuses matters.
    With your application which will be the same as a escort, you will need to seperate the wiring from the main loom so for example the starting wiring and wiring up the alternator. Once these 2 are done it just the main sensors for engine which are straight forward.

    It may sound difficult now but it will make more sense later

    Dave
    RWD Escorts - Making the competition look like c**ts since 1968!

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    Re: 20v blacktop wiring help

    Right then first of all apologies for not putting this info up last night. Finally sat down to watch the barca vs bayern munich game and fell asleep.

    Ok First of all the alternator wiring. As you will see this intergrated into the loom right up to the cabin plugs.
    Locate the alternator plug which has 3 wires on it. Yellow, Red/Blue and White. Wire up into your existing car wiring:

    Yellow - Dash warning lamp.
    Red/Blue - Ignition on live.
    White - Cut this wire but leave say 10 cm of wire on it. Put a ring connector on the end and connect it to the nut on the side of the alternator. The same one that gives main power to the alternator from the battery.

    The 3 wires mentioned above run through the loom so its best to remove all the plastic shrouding and trace all the wires and cut them out.
    Finally the last wire coming off the alternator is the thick main wire connected to the bolt on the side. From memory this is white or grey/red.
    Whatever colour it is remove it completely from the loom. Connect a new thick battery wire from the battery + side to the nut on the side where the white wire is with the ring connector mentioned above.

    Your alternator wiring is complete. Next is the starter wiring which I will post up later for you. Really need to do some work now.
    RWD Escorts - Making the competition look like c**ts since 1968!

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    Re: 20v blacktop wiring help

    thanks for the help, i was at a few other bits of this conversion over the last few days like the sump, mounts and modifying the bulkhead and kinda drifted away from the wiring side of things.
    heres a pic of the loom as i got it
    Click image for larger version Name:	DSCF1182.jpg Views:	139 Size:	74.4 KB ID:	63472

    from what i can see this is the ignition switch plug right?? im planning to get rid of the key type switch and just having an ignition switch and push button for the starter, do you know which wires ill need on this plug?? Click image for larger version Name:	DSCF1189.jpg Views:	139 Size:	61.2 KB ID:	63473
    also does the fuel pump work by a relay in the fuse box or would it be ok if i had it wired up direct working from a switch because i plan to have 2 pumps plumbed in so i have a spare??? just thought having them wired direct would would make things fairly straight forward when switching from pump 1 to pump 2. Cheers...Liam

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    Re: 20v blacktop wiring help

    Ok back again. now getting your engine started. The toyota starting system is straight forward to wire up to your existing beemer ignition.
    The starter motor only has 2 wires to get it running. 1st is the thick battery wire which is bolted to the starter and connected to + terminal on the battery.
    The 2nd is your exciter wire which comes from your barrel and is activated at the start position. This should be easy to locate as your existing beemer starter would have had one connected. Use a test lamp if neccesary. Connect this to the starter motor on the side (has a sqaure plug on)

    When I done this, luckily the toyota starter motor had the right sqaure connector in it and a bit of exciter wire left so i could easily crimp this to the escort ignition barrel wire. With yours you will also need to crimp a another 2 wires into this too. These will go to the STA terminal on your ecu and STA terminal on the COR (Circuit Opening Relay)

    COR is just a fuel pump relay and there easy to get hold. See the link below. The same one in the link can be obtained from a Mk1 Mr2. The STA terminal is simply a 12v input to let the ecu know the engine is starting.

    http://www.rollaclub.com/wiki/index....g_Relay_Wiring
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    Re: 20v blacktop wiring help

    Quote Originally Posted by Higginie View Post
    thanks for the help, i was at a few other bits of this conversion over the last few days like the sump, mounts and modifying the bulkhead and kinda drifted away from the wiring side of things.
    heres a pic of the loom as i got it
    Attachment 63472

    from what i can see this is the ignition switch plug right?? im planning to get rid of the key type switch and just having an ignition switch and push button for the starter, do you know which wires ill need on this plug?? Attachment 63473
    also does the fuel pump work by a relay in the fuse box or would it be ok if i had it wired up direct working from a switch because i plan to have 2 pumps plumbed in so i have a spare??? just thought having them wired direct would would make things fairly straight forward when switching from pump 1 to pump 2. Cheers...Liam

    Yes that is a complete 20v blacktop loom. I spent many hours trying to work out how I could get this running on the standard ecu.
    That plug pictured is not the ignition starter wire. The starter wire is on a black plug (body harness denoted plug B. See link below) Its the bottom black and white wire on it own. If you trace that wire, it goes into the fuse box and out again all the way to the ecu STA terminal. If you follow what I said in my previous post regarding the starting, you dont even need to worry about that and you wont need the Toyota fuse box at all.

    http://padandwheels.com/mr2/blacktop...ngharness.html

    The plug pictured above does have some important wires you will need. starting with the black and white wire closest and moving along and then down.
    Black/White - Switched Ignition
    White/Blue - Not needed
    Lime Green/Black - Not Needed
    Black/White - Switched Ignition - (This wire and also the first black/white wire powers the engine sensors so it worthwhile joining these together and finding a switched ignition point in the car)

    Blue - Not needed
    Yellow/Black - Not needed
    Thick White wire - Not needed. This is a alternator wire. Goes to fuse box so remove completely. See prev post for alternator wiring.

    Green/Red - Needed FC signal from ecu. Allows fuel pump to be primed before starting.
    Blue/Red -ELS1 on ECU - Not needed.
    Blue/Black - Not needed
    Purple - Not needed
    Black - Switched power for the COR only.
    Yellow/Red - Not needed
    Red/Blue - Not needed
    White/Red - Not needed
    Yellow/Green - Not needed

    Dont be afraid to shout up if your unsure of anything
    HTH
    RWD Escorts - Making the competition look like c**ts since 1968!

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    Re: 20v blacktop wiring help

    ok think i have the most of this figured out now but only thing that might be a problem is the speed sensor input the ecu receives at pin sp1. from looking at the diff of the beemer it looks like the speedo sensor gets 9 pulses per revolution(see pic below), how many pulses per revolution are these ecus to take as standard?? or is there anything else i could do like a bypass?? what effect does this input have on the engine anyway and is it even needed??

    speed rotor and sensor:
    Click image for larger version Name:	DSCF1240.jpg Views:	122 Size:	69.1 KB ID:	63597

    just a sneak peek of how the 20v is sitting in, ill have to put up a proper thread of the conversion sometime
    Click image for larger version Name:	DSCF1238.jpg Views:	122 Size:	93.3 KB ID:	63598

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    Re: 20v blacktop wiring help

    The speed sensor isnt needed. Ive read in the past it drops the rev limit a little but the engine will definately run without it. What gearbox are you using?
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    Re: 20v blacktop wiring help

    5 speed type 9, its standard at the minute but wouldnt mind havin a close ratio kit in her at somestage

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    Re: 20v blacktop wiring help

    Quote Originally Posted by Higginie View Post
    5 speed type 9, its standard at the minute but wouldnt mind havin a close ratio kit in her at somestage
    Happy days. I ran the type 9 and it worked well but for my next project, I will be using the T50 box.

    You have me thinking now about the E30. They go for reasonable money now and there easy to replace.
    RWD Escorts - Making the competition look like c**ts since 1968!

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    Re: 20v blacktop wiring help

    I think for rallying their the next best thing if you cant have a mk2, i also done a grp4 escort bilstein suspension conversion all round to this car with a coilover conversion kit in the front and with escort top mounts too... really i want to have this car grp4 spec but in an e30

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    Re: 20v blacktop wiring help

    I was working on the loom today and was wondering what the small square sensor beside the coil is for?? im left with a wire that comes from this sensor but nowhere to go since i removed the fuse box, do you know what this should be connected to??

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    Re: 20v blacktop wiring help

    Quote Originally Posted by Higginie View Post
    I was working on the loom today and was wondering what the small square sensor beside the coil is for?? im left with a wire that comes from this sensor but nowhere to go since i removed the fuse box, do you know what this should be connected to??
    That is a capacitor of some sort but I cant remenber what is for to be honest. Im sure ive still got the sensor somewhere so i will get the part number off it and have a look.
    RWD Escorts - Making the competition look like c**ts since 1968!

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