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 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.