03-01-2011, 04:36 AM
Join Date: Apr 2010
Total Cats: 0
Temperature Corrections don't seem to be working
Iíll describe the symptoms and hopefully some bright spark will enlighten me on where Iím going wrong:
Firstly- specs. S/C Miata, with intercooler. IAT bung is just before the intake mani, and I do not believe the sensor itself is subject to heat soak.
I USED to find that my car would run much leaner in cold/winter weather and Iíd always have to re-tune my ve table.
Iíve since totally changed coolant corrected air density from the DIYPNP basemap.
Iíve changed it to IAT corrected:
This ends at 3k rpm on the assumption that thereís sufficient airflow to not be affected by heatsoak of the intake tubing.
Map seems much better now. Iíve been tuning in the mornings when ambient is about 8 deg c.
WOT is tuned for 11.8AFR.
I went for a long drive over the weekend and WOT was now 12.5WOT. most disconcerting. Ambient was much higher about 15 deg.
This was on the motorway at about 4k rpm.
So it seems the ECU is over correcting for the warmer, less dense air and removing too much fuel.
Where can I play with parameters? It canít be IAT corrected air density, because that ends @ 3k rpm.