Hello.
My basic plan is to convert a mechanical injection/timing IDI Jetta in to an electronic IDI, using possibly v3.3.
NOTE: I am very, very new to this, so please explain all tech. comments well. I am a quick learner though. Work in IT, programmer etc.
Also I am not looking for people to hand feed me, if you can point me in the direction to read something I am all for it, and I will be reading the wiki lots so I may answer some of my own questions.
VW Jetta 90 1.6l IDI (Indirect injection)
The project will need very accurate crank position information for fuel injection.
Also no spark plugs, coils, or throttle bodies are needed.
What I will need is:
Hall/VR crank pos. setup
Throttle pos. sensor
3 BAR MAP
EGT (already have sensor)
Boost controller for Variable Vain Turbo
Looking to replace dash with the LCD unit to display all engine stats, if possible – more reading needed
Question I have,
I did skim through the member’s area, and didn't see any one else attempting this. So...is this feasible?
I know that the injection timing is pretty much the same as spark timing, with the exception that in a diesel you need to advance injection with higher RPM. This leads in to the second question:
Can the VEMS handle variable "spark/injection" advance, dependent on RPM?
If it can is there any limiting factor (for timing advance)?
After some more reading it looks like I will need to use Sequential Injection in order to make this work.
It is looking like the main question is does the VEMS have a high enough resolution on Crank position?
All I have read in the Wiki does not address this.
This website, addresses a way to know the exact crank position, they are more concerned about electrical motors from what I have read of it, (still need to read all of it). If this could be used in VEMS you could greatly increase your timing accuracy and injection accuracy.
http://www.automotivedesignline.com/howto/197001808
So After finally reading the article in its entirety, does the VEMS have a register that you can dump hex values in to, and then program against them in the firmware or other process?
I will post more engine information when I get home to look at my shop manual. I am sure there will be more information to post as well.
Thanks in advance for any help.
Brad