I tuned a VZ Maloo today LS2 with e40 in SD. When I first went mafless in this car it ran 25% lean. This was with stock Open loop tables. I then configured the open loop tables so the pcm would always command 14.7 regardless of IVT or ECT. I did the base settings and began to build a VE table. I found the VE to have an irregular shape. So I looked into the other airflow tables and modified them only to find the other VE modifiers had no affect at all on the VE including the barometric tables . The only table to have affect was charge temperature blending. However still, this did nothing to help.
The VE has values of around 100 at cruise 60-70 idle area at 2800-3200 140%! 3600 140% WAY to rich it blends back to 80% then stays at 80-90% so the whole topend VE is less then low end!!!. I figured it was charge temp blending working off dyn.cylair so I altered it somewhat and then made it a flat 0.100 something I commonly do in the e38. It maxes at 150g/s and reads 1.00 there after meaning it works off ECT for blending but at lower rpm it reads less. What I have found in e38 is this changes the mixture by a factor and does so in the e40 but with the e38 works off SAE.MAF only so it basically doesn't work in SD and goes from the zero reading. Weather or not my flatlining of it has affected the outcome I am unsure but doubt it very much as it reads the same low and high so should change little.
The huge step in the VE has created a misfire at 3200 99kpa I have smoothed the ve off to help but still there slightly. The huge step looks very abnormal and shows something wrong in VE calculations. If the dyn cyl.air is working in place of SAE MAF with charge temp blending then the sudden increase to 1.00 factor may explain something but the jump in VE is over 60%! these errors cannot be fudged with other tables also the need to reduce ve down low and have it highest at peak torque where it should be.
Is there a need to go to a 2 bar COS to fix this bug? as I have looked at all other options to "fudge" the huge error in the VE with no outcome other then charge temp blending which is just for minor IAT ECT blending not for correcting major errors.
cheers