I've been following DSX's FB posts for their Atlas PI Controller they're releasing soon, and was trying to understand one of the images Dave shared. I'm trying to understand if it's something to be concerned about, or - if it's no biggie.
In the image that he shared, I'm following the IPW trace. One can see the inflection point where the PI starts coming in, and at the end of the run, where the DI IPW comes down to. He shows a DI IPW of 4.68,s, which, to my humble understanding, sounds fine. BUT - you can see it peak, maybe, around 3500 RPMs (my scaling is just an approximate), but it's considerably higher than 4.7ms, where the run ended. I don't see any Chart scaling in the image (maybe that was done purposely), but that seems like it's gotta be higher than 6ms.
So - if we accept it's some amount higher that where it ended, and maybe make an assumption it's at least 6ms, my question becomes how high is safe in the lower RPM band? Dave doesn't show RAIL PRESSURE either, so we can't see what's going on there, but would there be any concern that IPW would go to 7, 8, 9, 10, etc. ms, as long as it recovers, as we see in the Graph? Does it matter, too much, what happens with IPW that low? Is there a circumstance where that could be an issue (I could imagine a scenario where lugging the engine down there could keep RPMs low and IPWs could be taxed, and that's not how I would operate an engine, but I'm trying to explore any scenario where something like this could be detrimental to the health of the engine).
Is the current thought, after a decade of mainstream DI in our V8s, any different than the convention of thought from years ago? I remember seeing a post (
https://www.camaro6.com/forums/showthread.php?t=600436) by toohighpsi, where Mike explored SOI and it's relationships to IPW, and if DSX's Atlas stretches IPW too far, is that something to be concerned about? E.G. - Mike showed it seemed safe to run IPW, around 3500 RPMs, to about 11ms, before the need to be concerned, so is there any new theory or experience to this?
I'm just curious. I already changed my torque model, and don't really retard my airflow such that my set-up requires replacement. I'm just experimenting, and trying to understand where I'm at, and where I should be. Does it even matter if we see 11ms at the height of IPW so long as it comes around, and under control well before the top of the RPM band?
Thanks, as always, for your comments, thoughts, and time.