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[new title] 77 280z w/ l28et regeneration

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#61 brapattack



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Posted 03 July 2017 - 11:21 AM

This car is still set up with the single wire, narrow band O2 sensor, as far as I know, the wide band ones didnt kick in until the later 80s 300zx ECU setups.


My sensor is an NTK specified for use with 79-83 280zx cars, which is the motor and ECU i have.  The air/fuel ratio gauge is an equus 8366


Im gathering parts to do the 300zx z31 computer, MAF and crank angle sensor.  The car is not actually running lean (as far as I can tell) and it survived that long roadtrip fine so I'l probably just wait till I do this swap to try again getting an accurate air/fuel ratio gauge working right.

#62 Slowpoke


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Posted 04 July 2017 - 03:53 AM

Get a legit wide band, preferably Innovate or AEM. Then research Megaquirt.

#63 Crashtd420


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Posted 04 July 2017 - 04:24 AM

The innovative Innovate Motorsports (3844) MTX-L Wideband Air/Fuel Ratio Gauge Kit, is real nice.. it can be stand alone, has data logging abilities and it has extra outputs to send a signal to an ecu.... plus i believe the computer program it uses allows for parameter changes.....

#64 brapattack



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Posted 15 October 2017 - 07:57 AM

I've been moving real slow on the 280z. Moved to Atlanta from Texas and had to get a different daily driver to use while I tinker on the 280z. Currently living in an apartment means no garage space.

I did the 300zx ecu conversion but am still trouble shooting it. The car had already had the 280zxt bits all moved around so even following Afshin's guide I couldn't do the fuel pressure relay mod in a smooth way. Right now it seems to run good at the start and then get worse as it warms up and gets to be running too rich.

The 300zx ecu is supposed to control the fuel pump rather than it always being on. I thought that that could be causing the rich situation....but with the fuel pressure being regulated at my fuel rail it seems like the pump being on/off/intermittent wouldn't force the extra fuel through. I'm going to try lowering fuel pressure. I tried turning the idle mixture screw on the MAF but it didn't do much.

I also need to learn the LED green and red blink language of this ECU so that I can see if there are other faults making it run in some kind of safe mode.