Update: 2008 Cadillac STS-V Corsa cold run day 2

I did a fresh morning baseline with the Spectre intake + Corsa exhaust.


0.4

Speed W/o Rollout W/Rollout Dist
0 0 0 0.0
10 1.03 0.63 6.9
20 1.75 1.35 22.7
30 2.48 2.08 49.5
40 3.33 2.93 93.1
50 4.26 3.86 154.3
60 5.24 4.84 233.9

60′ time was 2.3 sec, so still not good.  Unfortunately my pre-corsa cold air pre-run earlier in the week — also a 4.8s but 4.8s/5.12s — there was no usable Performancebox data file to compare the details from (tech glitch).

Accel results
Speed(mph)     Time(s)
0-60                   04.8
Distance()     Time(s)     @Speed(mph)
0-60′                  02.3                 32.8
PkAccelG     0.67G
I did disconnect the battery yesterday to speed up relearn, but the transmission is still hitting the rev limiter before shifting on some runs. Over time I suspect it will adjust, although it may need to be tuned to shift sooner.

My prediction is that the Corsa frees up 12-20 hp but I’ll have to get a better test run to prove that.  Today’s raw data is no improvement over the 4.8/4.9s posted prior to the new exhaust.

Compared to running hot in August pre-Corsa:

Today 0.4

August 90F
w/rollout
Speed W/o Rollout W/Rollout Dist Speed(mph) Time 0.44 Dist(f)
10 1.03 0.63 6.9 10 1.01 0.57 6
20 1.75 1.35 22.7 20 1.75 1.31 23
30 2.48 2.08 49.5 30 2.46 2.02 49
40 3.33 2.93 93.1 40 3.31 2.87 93
50 4.26 3.86 154.3 50 4.30 3.86 159
60 5.24 4.84 233.9 60 5.42 4.98 248

The difference appears to be from 50-60 mph.

Max calculated power on this 0-60 run was at 6105 rpm

Max calculated power based on torque delivered for the morning caused traction control to come on at the shift — an unusable run because I had not switched it off —

Here are my IATs for trending:

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

I plan to start recording Richard’s correction calculator for runs so I have that info.  Today was about perfect for a correction factor near ‘1’.  I am using the air temp from IAT1 for the adjustment; Richard suggests use the actual air into the engine, which is IAT1.

Conditions:  Cold run, 3/4 fuel; Weather for this run:

Note: The relative horsepower calculations are made in accordance with  SAE J1349. The standard reference conditions for SAE J1349 are:  Air temp 77 deg F (25 deg C),   29.235 Inches- Hg (990 mb) actual pressure and 0% relative humidity.

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