Acceleration Tests: 2005 CTS 3.6L

Car journal can be found here: http://caddyinfo.ipbhost.com/index.php?showtopic=39 for comments. Thanks, Bruce

Weather data for today:

 
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.

 

 

 

 

Racing Technology AP-22 Details:

    Introduction    
    Description & Details
    How well does it  work?
    Have you compared side by side results from a G-Tech Pro?
    How do Quarter Mile Results Compare between the G-Tech and AP-22?    
    Can you use the AP-22 to tell if a Mod Works?
   What could be improved on the AP-22?
    Why not just get a G-Tech Pro?
    Where can I get one?

 

 

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