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No downfall really.. It's preference whether you run VE, MAF or mixed. I've tried all 3 at the track and always went faster in MAF only, so that's how I run it all the time. Plus, no matter how many...

Actually, they are used but only if the OL tables command a richer EQ than the PE tables. Same theory applies to Boost Enrichment with the enhanced OS; richest table gets used.
I setup a closed loop...

I didn't try just because PE forces open loop and I'm already running open loop anyway.

The other interesting part is that we're all experiencing the issue based on a factor of time, but changing...

Found it.. Sort of.

I've dialed in the non-boost regions of the VE table. I started to work on boost, but the nasty spike still exists no matter how rich I command it.. I found it's coming...

I read roughly 65psi delta at idle, but only 58psi delta anywhere from 0psi boost on up.
In stock form, the ECM assumes there is a constant 58psi fuel pressure in the rail and adds/subtracts vacuum...

Something I noticed.. The PID for injector delta pressure never drops below 58 psi, which is what it's programmed to think fuel pressure is at all times. It increases with vacuum, but isn't...

Well I'll be damned. Same fuel pressure spike/dip here as well:
49618

InjDeltMeas is actual data using your formula, InjDeltaECM is the standard ECM PID.



The easiest way would be to make a...

Voltage shouldn't vary I wouldn't think. The pulsewidth ranges are semi large in the screenshots, but they are moving from what I see?

I also have a mechanically regulated ZL1 pump. I have a fuel...

I just started tuning VE with the MAF failed, but am still seeing the lean spike. I'm still on the rich side of things, but its roughly 0.8 leaner when it happens.
Screenshot when entering PE and...

Subd for results. Exact same issue here. I thought transient fueling was only used for tip-in fueling though, not WOT?