Duffy's 1/71 Series 1 240z build

[duffymahoney]

I think this ITB vacuum balance bar will work and look good. It’s far enough way from the header in this spot as well. 

[Blitzed]

Hello Duffymahoney,

Headed down the same path to EFI with a Haltech Elite 750. Accumulated parts over time, to mange the overall cost of the conversion $$$$$.  Learning as I go but wiring, blending to the stock harness and fusing the system is a huge grey area for me.  

early vin 73 240z with a transplanted L28, N42 Block and head, round top SU's. No head work has been done thus far and a stock cam. My goal is to work out the bugs on the modern EFI conversion first (while the car is running and driving) then pull the engine for rebuild and head work and cam. Nothing radical.

Convert in stages with a running / driving the car.

First convert the ignition. I have the Haltech 750 unit and purchased the modern CAS signal distributor (link below). This unit can be installed with a cap and rotor or as a distributor less coil set-up. Gives you the flexibility of both options. I'll run the ignition with cap and phase the rotor.

https://www.efihardware.com/products/1752/distributor-full-sequential-for-Nissan-L-series-6-cyl

Confirm with Haltech the compatibility of the CAS signal from this unit.  

Question- what Haltech wiring harness did you purchase (or not) and how invasive to the stock harness is the ignition (only) conversion? All I want now is ignition tuning and advance curve set -up.  

Second phase - ITB's install and fuel management. 

My 73 came with the factory fuel pump wiring (at the fuel gauge sensor) but was fuel pump delete from the factory. 

Have a new cleaned and sealed stock fuel tank with an Aeromotive stealth in-tank fuel pump fabed/ installed, all the fuel filters and external fuel regulator. 

Waiting to purchase the ITB's.  

Thanks for any help with the Haltech ECU wiring to the stock harness, CAS signal and coil.

I'll worry about the other sensor later, Map, coolant temp or head and O2.  

 

 

[duffymahoney]

Gas tank looks great!  

I got the non terminated harness, I did all terminations and looming myself.  So the lengths are all specific to my install.  On my last build (classic bronco) I didn't do that, and I would have to coil up extra wiring and I was never happy with it.  

[Blitzed]

Thanks for the response,

Any wiring diagram or help you can share on wiring ignition side? ECU connected to ignition, CAS signal and coil wire set-up? 

Read your post on the tach  conversion to your ECU, so would have assumed you've run down the wiring issues already.

The tach is not my concern right now, purchased a 77 tach with the post style (negative coil terminal) internals. Will swap the tach internal at a later date.

Thanks again. 

[conedodger]

That non-terminated harness is what I am using as well. I think any diagram is highly dependent on what sensors you use. Besides, the Haltech software creates a diagram for you...

[duffymahoney]

Ignition will depend on what you pick, what dizzy or what coils etc.. So I can't really help. But it was all simple, coils share a common 12v, ground then 6 total trigger wires. Cas will also depend on the type.  

 

 

I am using the stock tach now and it works great.  

[Blitzed]

Hi Conedodger,

Thank you for the response.

As mentioned, sensor's are not the concern right now other then the CAS signal. Want to focus on wiring the ECU to the ignition only, for ignition and advance timing. The coolant temp, O2, TPS, MAP ATS will all be installed with the ITB's and the fuel management. I can loom Haltech wires/ harness those sensors for future install. A quick drawing of the haltech ECU connection points to the ignition, distributor (CAS) and coil would be assume. 

Sorry DA when comes to electrical schematics

[Blitzed]

Duffy,

I purchased a distributor that provides two hall effect signals (CAS). Running a distributor cap and plug wires, no coils. 

https://www.efihardware.com/products/1752/distributor-full-sequential-for-Nissan-L-series-6-cyl

Just want to wire the ECU to the ignition (on and off with key), distributor and coil (coil to the distributor).  just the ignition for timing and advance curve tuning.  

Thank you for your help. 

 

[conedodger]

I'm not sure about the Elite 750. I am using the Elite 2500 and when you tell the tuning software what specific sensors you are using, The software generates a wiring diagram. I'll step back as I don't know the specifics of the Elite 750. 

[duffymahoney]

3 hours ago, Blitzed said:

Duffy,

I purchased a distributor that provides two hall effect signals (CAS). Running a distributor cap and plug wires, no coils. 

https://www.efihardware.com/products/1752/distributor-full-sequential-for-Nissan-L-series-6-cyl

Just want to wire the ECU to the ignition (on and off with key), distributor and coil (coil to the distributor).  just the ignition for timing and advance curve tuning.  

Thank you for your help. 

 

That should be a fairly easy install then!  

[Blitzed]

Will report back on the install of the sequential distributor system and ECU.   

[Blitzed]

Duffy,

Where did you purchase the coolant temp sensor? part number?  From the pics your using the port in the thermostat housing facing the ITB's. Found a few on-line but not sure of the internal shaft length. 

Thanks