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Thread: 75 280z l28et swap has any one dont it on 75 280z

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    Unhappy 75 280z l28et swap has any one dont it on 75 280z

    i need to know if anyone ha,s because i need to connect the IGNITION WIRE HARNESS from the 81 280zx turbo and install it in the 1975 280z... all the write ups are talking about 77 280z and the relays are diffrent than the ones i have on my 75...please some help i havent got any feed back from anyone on this site... if some has done the swap on there 75 let me know were the fuel relay and inhibitor relay are located and what wires u connected from the ignition wire harness to the relays...

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    Former frequent poster sblake01's Avatar
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    This is about the third different way you've asked this question in what, about a month? If someone has done this hopefully they'll chime in here but in the meantime can't you just compare the two wiring diagrams? Wouldn't that give you your answer? Sometimes you have to do your own research.....
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    You can get the factory service manuals as a PDF here:
    http://www.xenons30.com/
    http://www.xenons130.com/
    And I bet that there is a lot of information on this subject over at HybridZ:
    http://www.hybridz.org/
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    z 1975 im from fresno up until a few months ago ive lived there all my life. just wanted to share that lol.

    wonder if ive seen your z around. i used to roll with another 78 280z a few years ago.

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    Lol nice but no my car hasn't been driven yet... I've downloaded all the service manuals I can think of and I still haven't seen were exactly the ignition relay is I've seen some say its on the passenger side under the dash and others say under the hood were is It at on the 1975 280z .

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    i know its on the passenger side under the dash board on 78 280z's have you checked there?

    if its not its going to be in the engine compartment passenger side on the fender well in front of the battery where all the other relays are

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    That's your problem right there! You own a 75. That's the wierd one of the 4 years of 280Z. What I recall about them is that they still had the ignition interlock system left over from the 260Z. They don't have an ignition relay. They have an interlock relay. If you had a 76-78 I could help but I wouldn't even begin to pretend that I know how to connect the ZXT electronics to that system. But it has been done. Good luck.
    Last edited by sblake01; 07-13-2010 at 12:45 PM.
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    id say rip out everything that has to do with the ignition controll from the zx and install it in your 75.

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    Former frequent poster sblake01's Avatar
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    Quote Originally Posted by Shade133 View Post
    id say rip out everything that has to do with the ignition controll from the zx and install it in your 75.
    If you had the skills to do that and make it work, you'd probably have the skills to merge the two systems like he's trying to do.
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    lol that is true. didnt think to much about that reply.

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    I have done it many times, at least 6. In all the cases, I used the factory harness in the car, NOT the turbo harness. I just made your job a ton easier! You will need to swap a few parts on the motor and intake. You will need to use the 75 intake with the turbo injectors installed. You will also need to put the turbo throttle body on your 75 intake if you plan to use the factory J pipe from the turbo to intake. You will need to figure out what to do with the head temp sensor. It's in the thermostat housing on the 75, in the head on the turbo motor. Either location will work, you would need to lengthen the harness for the head temp if you leave it in the head. The AFM will need a guts swap. You take the guts out of the 75 and install them in the turbo AFM. This is waht makes the swap work. The bigger fuel injectors will make the car run rich, but the bigger AFM leans it back out. The last swap part is the most difficult. You will need to change the distributer drive shaft. You need any NA L6 shaft as the turbo one is different. You eit by pulling the oil pump, it will slide out. Make sure the motor is at TDC. The shaft will have a mark that will point strait up. Make sure when your done that the dizzy is still right on the number 1 cylinder. Now install the motor, and use the factory harness already in your car.
    The last car we did this to is a "lemons" race car. It dynoed 235 wheel hp at 10psi. We were shocked, we expected about 175-190. we also did this to a bunch of other 280's my 260 and an 84 Maxima wagon. send me an email and I'll try to help you through this.
    Jim

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    thats a good way of doing it

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    well turbo 260 i have the turbo motor already installed and harness with ecu... all i need now is to set up the ignition haress to hopfully crank it over and turn it on...thats were im stuck.. i sent u a PM already so we can norrow down what i need..

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    Well if I can't get this swap done right... I'ma look into just buying an n/a motor so I can drive it...
    Last edited by z 1975; 07-16-2010 at 04:53 PM.

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    I have an 82ZX Turbo motor in my 75 Z, However, it is used for racing and I have wired in a toggle switch in the dash to start the car.

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    KHow did u do it? To start it? Give me a list of things that u did so I can do it to mine, hopfully it'll start.

    Hey turbo 260 and sblake01. is it possible to put the 81 zxt dash harness on the 1975 280z with any complications? Since I already have the 1981 280zxt harness already in there...bcause the previous owner gave me the underdash harness not to long ago....

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    KHow did u do it? To start it? Give me a list of things that u did so I can do it to mine, hopfully it'll start.

    Hey turbo 260 and sblake01. is it possible to put the 81 zxt dash harness on the 1975 280z with any complications? Since I already have the 1981 280zxt harness already in there...bcause the previous owner gave me the underdash harness not to long ago....

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    I am trying to do the same thing a you z 1975. I also have a 75 and 81 l28et

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    has anyone made a wire diagram for the 75 280z

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    I'm actually almost.done with the wiring I just have to connect the fuel to a fuel relay and hope it turns on and stays on...as far as now it cranks over from the ignition switch which is FANDAMTASTIC

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    ive got it cranking over guys but i wont stay on ive got fuel, spark, injectors are clicking everything is good but it wont stay on any ideas on what i can do to trouble shoot this!!!

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    so i dont need the crank angle sensor then right? if i use the 75 wiring.

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    well im using the 280zxt harness but idk if i can use the stock 75 harness and ecu to turn it on

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    Well i am going to try to use the stock harnness

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    i hope it works. turbo 260 can you give me more info.

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    I talked to a shop that has done some l28et swaps into 75 and other years of the 280z. He said the same thing use the stock harness. Right now I have my 75 trying to start but I think my timing is way off.

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