Minor adjustments and temperature trends Cadillac STS-V

Making more room for fast revving at gear changes:

  • Raised Cutoff by 200 rpm: Engine Fuel Cutoff DFCO Cutoff vs RPM
  • Raised cam disable by 300 rpm: Engine Airflow Variable Camshaft Hi RPM Disable
  • Lowered Transmission torque management by 50% at WOT — Transmission Torque Management — Adder Modifier -0.50 at RPM 4500

1-2 Shift max rpm 6529 (target 30 mph / 6500 rpm)

Resulting shift 1-2 took 0.3sec then 0.4s on 2nd test. Need to retest cold due to the engine making more power cold.

Temperature trends hot / heatsoaked versus cold:

Corsa Cold Baseline Mar 25 2012 2nd Run



Down Delta MPH (Temps in Deg Fahrenheit)
Item 0 30 45 60 Across Run Heat Add
Ambient 55 55 55 55 0
6 IAT1 61 63 63 63 2 8
32 IAT2 93 93 100 106 13 43
0 MAT 93 93 107 129 36 23
Corsa Hot Run 1 3/26



Down Delta MPH (Temps in Deg Fahrenheit)
Item 0 30 45 60 Across Run Heat Add
Ambient 82 82 82 82 0
8 IAT1 90 95 95 93 3 11
30 IAT2 120 120 127 135 15 42
1 MAT 121 120 126 159 38 24
Corsa Hot Run 2 3/26



Down Delta MPH (Temps in Deg Fahrenheit)
Item 0 30 45 60 Across Run Heat Add
Ambient 82 82 82 82 0
9 IAT1 91 93 91 90 -1 8
27 IAT2 118 118 126 131 13 41
1 MAT 119 118 125 152 33 21

Interesting consistency that IAT2 uniformly starts ~30F and ends ~40F hotter than IAT1 regardless of ambient.  This suggests a way to check effectiveness of changes to the intercooler cooling system.  Other runs show a end range of 40-47F.

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