BMW E36 M42B18 - DET3

[loctec]

Hi all, i will highly appriciate if any of you can help to understand the proper way to attach an additional injectors. The project is to add turbocharger to N/A engine and to have oportunity to manage AFR under boost. I read out both manuals /DET3 and FIT/ but I don't understand something.

According to the DET3 manual I found following:

"Controlling additional injectors
The device can control up to 4 high-Z injectors per 1 power output. Using PWM map, it is possible to control the opening time of the extra injectors, and as a result, enriching the fuel mixture. A typical connection of the additional injectors is as follows:
The PWM frequency should be set in range of 30 – 40 Hz. Using the PWM#1 map, it is possible to control output DC (extra fuel dose) from 0% – 100%. A typical example of this usage is a N/A car with a turbocharger. When the boost increases, the DC of additional injectors also increase rising the fuel doses. Due to the additional fuel, the proper AFR can be archived."

If I'm right, that should be the simplest option /without any need to connect IAT, CLT, TPS sensors/ to add additional injectors controling them using PWM table and calculating load by using build in /MAP sensor X RPM/. The bad thing in this scenarion is that will be a problem to control 4 lo-Z injectors because I have to use both power outputs and may be to configure both PWM table?

In the same time I found here that in order to adding an additional injectors have to be done only in FIT mode, which provide wide range of adjustment but in order to work properly /speed density/ I have to connect IAT, CLT, TPS etc. So please can you advise me what is my options.

Thanks

[WHPZach]

You can do a lot by just intercepting and modifying the MAF or MAP signal and adjusting timing, which is what I would recommend on your application.