Transient Tuning and direct injection

hi,

I've understand the transient course, but what about a direct injection ?

i mean there is not fuel film déposit in the case ?

is there a transient table in DI , why , and how it works ?

I guess the DI Engine is quite more difficult to tune, and i dont see any module about it in my course.

there is a spécial course to take in HPA or webinars ?

thank you

Hi Kevin,

The only webinar I can see on direct injection is below

https://www.hpacademy.com/previous-webinars/157-understanding-direct-injector-di-timing/

I also found this comment form Andre from 2016

That's a great question. Considering what is going on with wall wetting which is the driving factor behind the requirement for accel enrichment, you would think that DI would be immune to this need. My experience here is limited as the only DI engine I've tuned on a standalone ECU is the FA20 (which is an oddity due to the PI/DI system) which does seem to require accel enrichment even when solely running DI.

I'll go out on a limb and assume that there is still some fuel wetting involved with a DI system but instead of the port this becomes potentially the bore and piston. I'd also guess that the requirements would depend on the injection timing, injection volume and the spray pattern and aim of the DI injector. I don't have sufficient experience with dedicated DI engines to confirm further at this point sorry.