Invent Jetronic ignition control for VW/Audi

JHM

Questions about ignition control feature for VW/Audi

Tom

Hello,

I have a understanding problem:

1.)The abbreviation EMUL means?

2.) Which functions are not possible if I have no EMUL?

Because KA-Jetronic has not the Connector 2 from the installation guide...
3.) Can I find the signal anywhere else.

I like to run a 2E block with rigid series ignition distributor and JH cylinderhead. The basic engine was a JH with KA-Jetronic (KA has underpressure ignition advance in the distributor).

Greetings Tom

JHM

Tom
1 - airflow sensor EMULator
2 - Audi/VW KE-Jet ignition control unit require airflow sensor signal for operation

If you have vacuum ignition advance - you don't need EMUL signal

If you want to use non-vacuum distributor - you have to use either stock ignition ECU, or Invent ignition control

Scirocco

Okay, I like to run the 2,0L "2E" block with it's non-vacuum ignition distributor BUT due to regulations in germany it should look like "JH" engine which has no potentiometer for MAF.

What I don't understand: If you disassemble the plate from MAF and fix it with plastic strap how will you get a signal on EMUL wire?

I don't like to run the ignition by the stock ECU.

Is there any way to use your Jetronic?

JHM

EMUL signal is generated by the Jetronic ECU for stock ignition ECU (if you have any)
Our Jetronic ECU don't need MAF housing at all.
You can run ignition from Jetronic ECU too.

Tom

Thx, I think (hope) I got it.

The EMUL signal is only needed in KE-Jetronic to have some proper values in the stock ECU. Right?!

Okay that sounds good! If I'm wrong again give me a hint!

JHM

Tom
correct

Tom

Hi,
yesterday I sarted my new engine with jetronic.
base informations:

2.0Liter 8V
11,5:1
camshaft 272
-distributor static
basemap from you for Audi/VW 8V

Engine started well was running at 2000rpm.

But I only had for 2min a bluetooth connection... I didn't saw the ignition map!
I need the ignition map - what do i have to to do?

Greetings Thomas

JHM

Enable advanced settings in Interface tab

Scirocco

Thanks.

I installed a Idle switch. But I don't unverstand how I should connect it. How can it work with one wire?
Same question for full load and temperatur.

I understand it at hall signal from distributor because where we have 12V and ground and use with output Signal.

Can you help me and explain?

JHM

Check stock wiring diagram for 5cyl here:

https://invent-labs.com/jetronic/docs/en/installation/audi_aar.html#wiring-diagram-for-audi-23-aar-engine

Tom

😉

The car is running without a modified distributor + your base map and without advanced settings

1.)temperature sensor still no value. which sensor should i take. Both stock sensors dont work with jetronic...
2.) no rpm signal visible..
3.) for "advanced settings" do I have to modifiy the distributor?
4.) where can I see, why the ecu makes fuel cut. fuel injection is suddenly zero and than it "restarts" and runs again.
5.) idle switch and full load switch is always on "1" even if it is disconnected! What can be the error? the switches work!!!

Please support my project with your expert knowledge!

JHM

See installation manual for sensor check
Then how the engine is running?
No. You can just turn it on.
Because switches are not working
I guess switches are not sending voltage.

Scirocco

Checked both clt Sensors... Looks good.
Yes in Diagnose Block RPM is "0"
Engine doesnt Start if it is on
4+5. Switches work. Which voltage does the jetronic need? 5v or 12V

JHM

Then stock ECU is broken, does not apply voltage. Switch sensor type to separate, and use manual Calibration.
If everything works, voltage should be 9+ volts

Scirocco

Today I made huge progress!

The stock ecu does not deliver voltage to idle and full load switch and to temperatursensor...
Now even if connector and temperatursensor are defect the engine runs smooth after some corrections on VE table and without lambda correction on VE

further questions I use advanced settings

Even if ignition map are with different ignition angles. The timing itself on the engine is not influenced. It is always the same value independed of RPM and load.
What do I have to Chance?
Why we have 2 ignition maps?
Can i invert the signal of full load switch in the Software?

Thanks in advance

JHM

I guess ECU is in Idle mode, which uses separate table
For LPG
You can invert both idle and fulload at the same time. Change engine type to custom, and you will see those options.

Scirocco

After another day on the car.

Idle mode is not the problem. Idle switch works perfect. And although if I invert the signal the ignition doesn' t work according map. It is always 10° advance indeependend from rpm.

I run the standard components. Distributor, coil,...

Coolant temperatursensor signal is still not okay.
Due to the fact that the stock ecu makes no voltage to sensor.

How can I substitude this?

Scirocco

I was on my car.

First:

Does the missing temperatursensor cause that it will not run according ignition map?

You mentioned that it will not run according ignition map because it is in idle mode.

Idle mode is than it is shown green in the bottom line.

What can I do?