Temperature Corrections don't seem to be working
#1
Temperature Corrections don't seem to be working
Hi guys,
I’ll describe the symptoms and hopefully some bright spark will enlighten me on where I’m 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 I’d always have to re-tune my ve table.
I’ve since totally changed coolant corrected air density from the DIYPNP basemap.
I’ve changed it to IAT corrected:
(deg c)
13 103
16 105
19 107
22 112
25 115
30 120
40 125
This ends at 3k rpm on the assumption that there’s sufficient airflow to not be affected by heatsoak of the intake tubing.
Map seems much better now. I’ve 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 can’t be IAT corrected air density, because that ends @ 3k rpm.
Stumped.
I’ll describe the symptoms and hopefully some bright spark will enlighten me on where I’m 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 I’d always have to re-tune my ve table.
I’ve since totally changed coolant corrected air density from the DIYPNP basemap.
I’ve changed it to IAT corrected:
(deg c)
13 103
16 105
19 107
22 112
25 115
30 120
40 125
This ends at 3k rpm on the assumption that there’s sufficient airflow to not be affected by heatsoak of the intake tubing.
Map seems much better now. I’ve 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 can’t be IAT corrected air density, because that ends @ 3k rpm.
Stumped.
#3
Thanks for the reply.
Yes, it is a MS1.
In coolant corrected air density, you can change it to IAT corrected air density. That has parameters for the rpm range it ends at. which is 3k rpm in the basemap.
However, if it really doesn't end there, then i know i've probably been too onservative in my correction
Yes, it is a MS1.
In coolant corrected air density, you can change it to IAT corrected air density. That has parameters for the rpm range it ends at. which is 3k rpm in the basemap.
However, if it really doesn't end there, then i know i've probably been too onservative in my correction
#6
Appreciate your support here.
I’ve taken a log this morning.
MAT was 2.8 deg c this morning and Gair was 109
After Motorway journey and heatsoaking traffic, MAT rose to 15deg c. Gair 107.
Both times rpm is around 1500. Is this right?
As expected the taper works, and when I hit highway rpm over 3k rpm Gair drops off to 105.
Can someone comment on whether this is correct?
I’ve taken a log this morning.
MAT was 2.8 deg c this morning and Gair was 109
After Motorway journey and heatsoaking traffic, MAT rose to 15deg c. Gair 107.
Both times rpm is around 1500. Is this right?
As expected the taper works, and when I hit highway rpm over 3k rpm Gair drops off to 105.
Can someone comment on whether this is correct?
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