Shalmaneser wrote: ↑Mon Jan 09, 2023 8:26 pmAs far as the injectors go these are Bosch EV1s. How do people get these characterised?
For initial settings, either by reference (as your info below), or by testing for ohms and 100% flow at your system's pressure. It's only to get the engine started and a rough tune set. After that, you can test the injectors running on the engine for actual values in your system with your pressure and voltages.
Shalmaneser wrote: ↑Mon Jan 09, 2023 8:26 pmIts fairly easy to swap these out for some known alternatives but in the name of keeping things simple it would be great to retain the OE parts.
No reason to change injectors, unless you have a reason.
Shalmaneser wrote: ↑Mon Jan 09, 2023 8:26 pmHaving cleaned and tested the existing injectors I was interested to see these are not single point injectors (as the EV1s on my E36 M3 Evo were) but multi point injectors so moving to EV6's wont be much of an improvement anyway.
If they have been tested, then you already have the info on them to get started.
Testing should also include dead-time opening and closing values, plus voltage corrections.
A common assumption is that different spray patterns are somehow "better". Careful! There are different patterns to solve different airflow dynamics issues, or to reach certain goals, i.e., minimizing wall-wetting or low-speed vaporization. Multi-hole injectors may be a downgrade, depending on how the air flows in your engine, and the injector timing to that airflow. Unless you have data that supports a different pattern, or if in-doubt, using the same pattern that came in your engine is a good bet.
Shalmaneser wrote: ↑Mon Jan 09, 2023 8:26 pm@3bar/43.5 psi:
236cc per minute
12 Ohm resistance
Is that all I need?
Yes, and if they are reasonably accurate, to start the engine. If the pressure or voltage is different in your setup, then the numbers will change. However, they are "lab" numbers, and again are only a place to start the engine and begin tuning. Your next important set of numbers are the latency (dead-time) at a specific voltage, and corrections for voltage variation. Those numbers will save you a lot of headaches as you try to tune.
Have fun!