Quote:
Originally Posted by solidONE
Only modification that would require adjustment in the fueling I have is a cat delete on the front pipe and a drop in filter with trimmed intake snorkel. I switched back to the factory air filter and the high LTFT remained the same as with the aFe panel filter. The snorkel and drop in filter were accounted for in the tune, according to Shiv's posts. The rest of the intake is completely stock, including the sound tube. Not sure how the exhaust mod can change the MAF sensor readings.
With no vacuum or exhaust leaks to skew the O2 readings. The fuel trims were running pretty high but not high enough to trigger CEL with Vishnu's STG 1 tune. Was the same when I replace the air filter with the factory unit. How would you adjust for more fuel enrichment in this instance. Unfortunately, I do not have any way to log port to DI ratios effect on AFR. Also, what do you think about the 11.25 AFR at high load. I understand that O2 sensors are not 100% accurate, but does it read so rich that we have to run the AFRs that low?
After the adjustment I made and the LTFT at 0%, car runs smoother and IAM is pinned at 1.0 and not budging at all. Although, it is running a tad rich according to the STFT at low load, part throttle conditions.
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if you're on pump gas and the only thing you've changed is related to the intake (the filter and trimmed snorkel) then it would be reasonable to adjust the maf, it just doesn't make sense that it would require an across-the-board correction like that unless the diameter changed, which i don't believe it has given your description. typically any changes introduced by something like a filter or altering the airbox would look more like turbulence, less like global correction.
you are on pump gas, correct? i'd recommend going back to stock maf scaling and creating a proper fueling error chart from at least 30k rows of data, just to see where you really are now. there is very little to learn from looking at trims in the log without applying some math and making the data more reasonable to interpret. in fact you can be led very far in the wrong direction by just looking at raw logs without filtering and processing.
once you have good reliable data to go on, you'll see if changes are necessary and know (pretty much) exactly what to do to fix it.