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 Post subject: Re: L18e onto L16
PostPosted: Thu Nov 02, 2017 6:49 pm 
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Location: CRACE, ACT
Are you still chasing info regards factory EFI L18? I have all the info you could need. I have built a few of these, starting back in 1987. My son still drives one of the 180Bs I built with the factory EFI added onto an L20B block. I still have most of the bits needed to put one together: manifold, ECU, wiring loom, wiring diagrams, factory manual, and …

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 Post subject: Re: L18e onto L16
PostPosted: Sun Jun 10, 2018 5:48 am 
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Joined: Fri Apr 30, 2010 9:52 pm
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Location: Kenya
Its long since i logged in here


unlimitedpower

This is marvelous! :hail: :hail: :hail: :hail: :thumbsup: :thumbsup: How did the project go. Please share


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 Post subject: Re: L18e onto L16
PostPosted: Sun Jun 10, 2018 5:53 am 
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Joined: Fri Apr 30, 2010 9:52 pm
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Location: Kenya
AlanDatsomefun wrote:
Are you still chasing info regards factory EFI L18? I have all the info you could need. I have built a few of these, starting back in 1987. My son still drives one of the 180Bs I built with the factory EFI added onto an L20B block. I still have most of the bits needed to put one together: manifold, ECU, wiring loom, wiring diagrams, factory manual, and …


AlanDatsomefun,

I am still chasing that info. Wiring diagrams and factory manual would be nice.
Have you done any mods on either of them?


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 Post subject: Re: L18e onto L16
PostPosted: Mon Jun 11, 2018 9:54 pm 
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Joined: Thu May 22, 2014 3:53 pm
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Location: CRACE, ACT
I didn't have OEM EFI relay and fuel pump relay, so figured this out from scratch using factory wiring diagram as a guide. I didn't have the OEM air cleaner, but was able to get the correct air flow meter. The EFI is much the same as the original installation and runs on an L20B with a mild street cam. I'm guessing that it makes about 125HP. My son has the car, but I have access to all the technical info. I can help you with that.
The person who commented that if you want better performance then use an aftermarket engine management system (MoTec, Haltech or whatever) is right, but this L-jetronic works fine albeit not a high performance setup. I have since built a stroked naturally aspirated L18 with custom internals, MoTec and custom manifold: it makes 200Hp, but it has cost me a small fortune. … pays you money … takes your choice!

Let me know how I can help. I will do what I can though I cannot guarantee an immediate response every time. I'll do what I can.

As I gather the info together I will post it on this forum.

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 Post subject: Re: L18e onto L16
PostPosted: Thu Jun 14, 2018 5:00 am 
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AlanDatsomefun
thank you for this information. One thing I couldn't make work is the fuel pump to run at the ignition "ON" position and i had to connect it 'direct'.

I would wish to have the L-Jetronics running (the car has been under a slow restore) then I am thinking of looking into a simple after market engine management but using the plenum. The car is intended to be a daily drive.

I would wish to have a look at what you came up with in place of the OEM EFi relay

Thank you


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 Post subject: Re: L18e onto L16
PostPosted: Thu Jun 14, 2018 9:57 am 
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Joined: Thu May 22, 2014 3:53 pm
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Location: CRACE, ACT
For safety reasons power is provided to the fuel pump during cranking (ignition "ON" and power to the starter motor "START") and when the ignition is "ON", and engine is running normally. In the "engine running" mode there must be oil pressure AND output from the alternator (alternator turning with ignition on). If there is a problem with either, a warning light will be displayed on the dashboard. If there is a problem with both, power will not be supplied to the fuel pump and engine will not run.
Without the original EFI and Fuel Pump relays, you will need several relays (typically three).
I've posted the wiring diagram I built for my car which has R31 ignition switch and I am running a MoTeC electronic control unit, but the fundamental wiring for relays will be the same. In this diagram, as an additional precaution, power is provided to the ECU only when you want the engine to start and run. I have shown relay pin numbers corresponding to the functions specified by the Bosch (DIN) naming scheme. I can post a copy of the (simpler) wiring diagram I used for my first EFI installation. From memory it used very common types of relay (5-pin with contacts normally open and 5-pin changeover types). Unfortunately I do not have it at hand and it could take a few days to find.
Please see Bosch L-Jetronic for Datsun wiring diagram for early to mid 80s Datsun (either 4 or 6 cylinder). This shows an oxygen sensor in circuit, but I've never seen one fitted. You will find that pins 16 and 31 are not connected to the electronic control unit.
Alan


Attachments:
EFI Fuel Pump Relays.jpg
EFI Fuel Pump Relays.jpg [ 457.79 KiB | Viewed 112 times ]
BoschLdatsun79-83.jpg
BoschLdatsun79-83.jpg [ 212.38 KiB | Viewed 112 times ]

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 Post subject: Re: L18e onto L16
PostPosted: Mon Jun 18, 2018 5:25 am 
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AlanDatsomefun.

Thank you

Let me look at the schematics and revert.
:thumbsup:


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 Post subject: Re: L18e onto L16
PostPosted: Fri Jun 22, 2018 7:44 pm 
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Joined: Thu May 22, 2014 3:53 pm
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Location: CRACE, ACT
I have located an OEM Nissan manual for this EFI - if you want, contact me by private message.

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