Why bother dialing in the VE table?

[pauly24]

Theres probably an undiscovered table somewhere, this is the first GM V8 car Ive played with, and when I opened up an LS1 tune I was amazed and how many more tables there was to play with compared to the E38.

What does a log of LTFT look like on an LS1? can you distinctively see that there are boundaries where zones have all the same LTFT?

[joecar]

Sure, a car with +20% trims might run the same as a car with +1% trims during any steady state condition...

where those cars deviate is during transient conditions and conditions outside of closed loop.

[joecar]

Example LS1 log.

[redhardsupra]

After having a look there appears to be no defined boundary settings in the E38 cal. This doesnt necessarily mean that they dont have them though. Quite possibly they use some other method due to the way they calculate the airmass through coefficients. They could also quite easily tie them in to the operating zones. But that is just a guess & not good science.(Dont shoot me Marcin)
Any chance you can post up some logs Pauly24 with MAP,RPM,STFT & LTFT?

hehe, all good science starts with observation and conjecture, it's what happens next that's important.

On a more technical note, if you don't know what the modifiers are doing, graph them separately from the VE. If you've done any of the old school VE tuning with narrowbands, you probably noticed that the trims are different in every RPM/MAP cell corresponding to entries in the VE table. So I don't think any of the really old 'block trims' really apply anymore, even on a LS1 computer, yet alone on a modern E38/E67. But again, that's conjecture, and it will remain so until our resident lord and saviours Ross and Paul will tell us how the code works. This of course brings up other questions, like 'then what are all the LTFT boundaries for?' or 'what is the resolution of the trim tables?' and 'how do LS1 differ from E40 and E38/E67 in respect to fuel trim setting and application?'

[5.7ute]

Mapping the trims will still show different values in different cells regardless of the boundaries because they are reactionary, not because they arent "block learned". The LTFT from one loadpoint carries over into the next cell, & then is further modified to suit the different conditions at the time. You really need to follow the trace & not a map in these scenarios to see how they work.