Hoping to get a little help diagnosing why the "VE Sum Uncorrected" (SCALEDUNVE_DMA) pid is changing drastically at a rpm zone boundary (specifically going from zone 17 to 23). The corrected VE sum doesn't change, but the uncorrected does.
Does anyone know the formula for the SCALEDUNVE_DMA pid? IE, what tables are used in the calculation. Using only the coefficients from the VVE table, the two don't match up. At the point in question (139 kpa, 3200rpm) the VVE table has a value of ~1600. However the VE Sum Uncorrected pid has a value of ~2150. The MAP corrected VE pid is ~1800. (see attached log file from 1280 to1290)
The change in VE going from one boundary to another causes a change in the APC calculation and makes the engine go lean. I've also attached the tune file, which shows the VVE table is smooth between the two operating zones.
Background:
2.4L LE5 w/ E67 ecm, M62 s/c and max boost of around 160kpa, tuning MAFless at the moment.
TIA!
KCM_JJM_retune_dyno_2.tunretune_log2.efi