www.caddyinfo.com CTS Testing

Temp: 79°	Dew Point: 64°
Humidity: 61%	Wind: SE 6 mph
Visibility: 9.0 miles	Pressure: 30.04 in.
Sky: Partly Cloudy

AP-22 Vehicle data: Mass 3900 lb CdA 0.710 Roll Resistance 0.013; Tilt Factor 0.001; Roll Factor 0.011; Smoothing 0.004. Trigger Value: 0.29g.

First 2005 CTS 3.6L run -- Traction control off, AC off, sport mode, 3/4 tank gas, lots of wheelspin. Factory airbox. New road surface compared to previous tests. Regular unleaded fuel. Start Speed 0.0mph

mph	s	g	ft	hp
10	0.88	0.51	6	54
20	1.76	0.53	25	113
30	2.7	0.44	60	142
40	3.84	0.36	119	161
50	5.26	0.29	213	167
60	6.91	0.26	347	184
70	8.85	0.21	532	180

Pk Power	65.0	mph	7.83	s	431ft	191hp
Peak G	23.1	mph	2.01	s	33ft	0.55g

2nd 2005 CTS baseline back to back run:

mph	s	g	ft	hp
10	0.9	0.5	6	52
20	1.83	0.48	26	102
30	2.74	0.45	60	147
40	3.87	0.35	118	157
50	5.26	0.3	211	171
60	6.86	0.26	340	187
70	8.77	0.21	523	180

Pk Power	66.6	mph	8.06	s	452ft	196hp
Peak G	27.5	mph	2.49	s	49ft	0.54g

Another surface to limit wheelspin:

mph	s	g	ft	hp
10	0.78	0.65	5	69
20	1.6	0.5	23	107
30	2.62	0.43	61	141
40	3.76	0.36	120	161
50	5.16	0.3	212	169
60	6.81	0.25	346	179

2004 CTS with stock paper air filter:

Temperature	69 °F
Humidity	64%
Dew Point	59 °F / 15 °C
Wind	SE at 12 mph / 19.3 km/h
Wind Gust	-
Pressure	30.03 in / 1016 hPa (Falling)
Conditions	Mostly Cloudy
Visibility	10 miles / 16 kilometers
Clouds (Above Ground Level)	Mostly Cloudy (BKN) : 2500 ft / 764 m Mostly Cloudy (BKN) : 12000 ft / 3659 m

First run -- Traction control off, 3/4 tank gas, No wheelspin. Factory airbox. Start Speed 0.0mph

mph	s	g	ft	whp
10	0.71	0.66	5	68
20	1.48	0.51	22	110
30	2.46	0.46	58	150
40	3.53	0.39	113	173
50	4.88	0.32	202	179
60	6.40	0.28	325	194
70	8.21	0.22	499	189

Pk Power	77.3mph	9.74s	664ft	209hp
Peak G	11.2mph	0.79s	6ft	0.67g

2004 CTS comparison to 2005 CTS by time to speed:

	2004	2005
mph	s	s	Delta
10	0.75	0.90	0.15
20	1.55	1.83	0.28
30	2.53	2.74	0.21
40	3.58	3.87	0.29
50	4.92	5.26	0.34
60	6.40	6.86	0.46
70	8.16	8.77	0.61

One week later, same site, Premium fuel for 100 miles prior to the test, 6g used. Weight not reset on AP-22 due to darkness at test site (bring a flashlight dummy), so was 3901lb should have been 3936 lbs.

Temp:	68 °F / 20 °C Mostly Cloudy
Humidity:	73%
Dew Point:	59 °F / 15 °C
Wind:	9 mph / 15 km/h from the North
Pressure:	30.10 in / 1019 hPa
Visibility:	7.0 miles / 11.3 kilometers
UV:	0 out of 16
Clouds:	Mostly Cloudy 4200 ft / 1280 m Mostly Cloudy 12000 ft / 3657 m (Above Ground Level

Lots of wheelspin:

mph	s	g	ft	hp
10	0.87	0.52	6	55
20	1.74	0.52	25	112
30	2.66	0.44	59	145
40	3.75	0.39	115	170
50	5.11	0.31	205	177
60	6.68	0.27	332	189
70	8.56	0.21	512	186

Pk Power	64.6	mph	7.48	s	406ft	198 hp
Peak G	24.3	mph	2.09	s	36ft	.55g

Still too much wheelspin getting to 10 mph, but much better 0-mph numbers.

Comparison of 6.86s run with 87 octane to 6.68 run with 93 octane:

mph	93 Octane	87 Octane	Delta
10	0.87	0.90	0.03
20	1.74	1.83	0.09
30	2.66	2.74	0.08
40	3.75	3.87	0.12
50	5.11	5.26	0.15
60	6.68	6.86	0.18
70	8.56	8.77	0.21

Tests on different days, but persuasive enough for me to only run premium fuel in the CTS for now.

mph	2005	2004	Delta
10	0.87	0.75	0.12
20	1.74	1.55	0.19
30	2.66	2.53	0.13
40	3.75	3.58	0.17
50	5.11	4.92	0.19
60	6.68	6.40	0.28

Vs the 2004, the resurfacing of my test site and loss of .12s 0-10 mph seems hard to overcome.

Acceleration Tests: 2005 CTS 3.6L

Weather data for today:

2nd 2005 CTS baseline back to back run:

Another surface to limit wheelspin:

2004 CTS with stock paper air filter:

2004 CTS comparison to 2005 CTS by time to speed:

Racing Technology AP-22 Details: