hi all..
i have bought a14 egi parts today. looks like complete but without fuel pump.
what will be the pro/cons of mating the a14e injection setup to a15e block?

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  a14 egi.jpg (144.21 KB)


  ecu.jpg (172.93 KB)


  ecu1.jpg (144.27 KB)

It will work just fine

* The block is the same (late A14 and A15 blocks use the 'G34' casting)
* The EFI components are mostly the same except the exhaust manifold. A15E uses same cylinder heads as late A14E
* Fuel pump is not attached to the block

Thanks mate.
The computer box marked 'A14E' where else my previous a15e computer box marked as A15E. Will that make any difference?

The difference in tuning between A14E and A15E is slight


Use a matched set
* A14E computer + A14E AFM (air flow meter)
or
* A15E computer + A15E AFM

Mixing and matching the two is not a good idea: A14E computer + A15E AFM may not run well

many thanks...

this egi set is from a chopshop which never been running for many years..
so what is the precaution i should take?

If you can afford it or have it, use wideband / a/f to keep a lookout if you mix is rich or lean, then you can check if the engine is getting to little or too much fuel, as that is the only aspect you are changing

Thanks. The wideband cost around 50-100 USD from eBay. Very useful device.

I went to few workshops today. No one advice me to use the computer box in AFM. Unless it is from a running engine. They advise me to use a stand alone computer. I'm confused, should I run this with stand alone computer or look for another original set from running engine?

The Datsun ECU is a "stand alone computer". It is self-tuning to some extent, although it is not fully programmable like a modern unit (it doesn't have a "chip"), and it doesn't need one

The Air Flow Meter (AFM) is the flapper gauge unit. The A14E ECU is calibrated for the A14E AFM, and so can handle different size engines as it measures the airflow. While the A15E engine has same airflow at 6400 rpm as A14E engine, A15E has more airflow at 4000 RPM. The combination of ECU/AFM measures the air so it can determine how much Fuel to deliver (it controls the A/F mixture). Both engines use the same a/f ratio of 14.7:1 at cruise, along with full-throttle enrichment. 14.7 is required by the Catalytic Convertor, although the engine will run smoother at richer a/f ratio

Quote:Don't you already have a matching set? Your first photo shows both parts. Try it and see if it works. Datsun guys here in USA have used Hitachi ECU on different size and type Nissan four-cylinder engines with good results. In the photos above, the ECU looks undamaged, and I see no corrosion on the circuit board. Check the AFM flap to see if it moves smoothly and is undamaged

You could also use an aftermarket engine "computer". That'll work too and is fully programmable. See our tech article "ECU" for a brief discussion of several choices