View Full Version : 1 point fuel injection 1.8 ~90

Olper Keleman
03-23-2009, 05:00 PM
Good day,

I'm working on a megasquirt project. I'm trying to use the injection system from a subaru legacy ~90 on my old Opel Kadett B -73...
i was wondering about the idle air control. Is it a stepper motor or is it used by pulse width modulation?

Does anyone have a good guide to this model?
The model is this:

Olper Keleman
03-24-2009, 11:10 AM
Some digging up..

the model is EJ18, though i bet u knew that already..

04-13-2009, 01:53 PM
I believe the IAC is a stepper motor but don't quote me, I will do some research and see if I can find out for sure and let you know

Olper Keleman
04-14-2009, 04:37 PM
Thank you.

This motor seems to be a world-market version (as the americans call it) of ej18 motor. Has a monopoint injection..

Here's a bit better picture of the throttlebody:

Olper Keleman
05-02-2009, 05:26 PM
I also wonder about the fuel pressures..
Autodata software says that AY/EJ18 -motor uses 2.5 bar fuel pressure.. but i bet this is for the multipoint injection..
Monopoints often have something like 0,7 bar

05-03-2009, 11:36 AM
Yeah I think you are right about the fuel pressure, it sounds high to me too but I have checked it against two different sorces and get the same readings. I do not know the pressure readings in bar but in PSI the pressures should be 20-24PSI at idle with a maximun of 36-50PSI. Kind of a broad range on the max pressure but thats what the manual says. Oh yes, I was wrong about the IAC motor too before, it is not a stepper motor.

Olper Keleman
05-04-2009, 06:42 AM
20-24PSI is about 1.4-1.65 bar, and 36-50PSI is from 2.5bar to 3.5bar...
So i should be able to get it running with 2.5 bar =).. if the squirt-time gets too short during idle, i have to drop the pressures for idle... that shouldn't happen as i have 290 cam

good thing the IAC isn't stepper, as that is tricky to get working on megasquirt. I should be able to PWM-control it then =)

this might actually work! Thanks rutech!

05-04-2009, 07:51 PM
I am curious about megasquirt. I have herd about them but never been able to talk with anyone that has used it. If you get a chance let me know how you like or dislike that setup. I would love to pick your brain about it. Your welcome for the info too, glad I could help.

Olper Keleman
05-06-2009, 05:14 PM
I'll let you know when i get my project that far. I have built the ECU and have gathered a big bunch of parts.
Meanwhile you can read a whole lot about megasquirt from http://www.msefi.com and http://megamanual.com