KJ Jones
October 15, 2013
Photos By: KJ Jones

On The Dyno

After taking the upgraded Pony for a California emissions test (detailed in the Smog Check sidebar), we immediately loaded it onto the rollers of the Dynojet chassis dyno at GTR High Performance to determine how much power a stock 5.0 makes with the new 2.3-liter TVS Roushcharger (PN 421388, Phase 1; $6,099.99).

It's not often that details on a power adder's performance and effectiveness are not the priority in a tech report about that particular power adder. However, for this report, it has nothing to do with the power adder being unable to perform. To the contrary, as you can see in the graph and numeric dyno information, the Roushcharger we installed on Kurt Schutte's stock ‘11 GT makes excellent pump-gas, California-emissions-compliant steam.

Of course, when it comes to Coyote Mustangs, we're quickly learning there's no such thing as enough rear-wheel horsepower. One of the 5.0 Roushcharger's beautiful qualities is that making bigger steam is done with ease. We went directly from Phase 1 to Phase 3 with Roush's bolt-on upgrade kit (PN 421596; additional $1,499.99) hoping to see Kurt's 'Stang rock the rollers with a lot more rear-wheel ponies.

We must note that the Phase 3 segment of this supercharger system is only available for Mustang GT's with six-speed manual transmissions. More importantly, the equipment that helps produce the additional power and torque are not legal for use in California.

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Baseline Phase 1 Glory Difference
RPM Power Torque A/F Power Torque A/F Power Torque A/F Power Torque A/F
3,000 177.35 310.49 12.13 234.58 410.60 11.37 238.62 417.67 12.01 61.27 107.18 -0.12
3,100 186.10 315.29 12.33 242.93 411.57 11.30 250.40 424.29 11.97 64.30 109.00 -0.36
3,200 195.61 321.04 12.48 252.17 413.88 11.27 257.46 422.50 11.89 61.85 101.46 -0.59
3,300 206.50 328.65 12.59 257.39 409.70 11.34 266.71 424.50 11.75 60.21 95.85 -0.84
3,400 217.80 336.43 12.63 265.33 409.81 11.44 274.09 423.42 11.68 56.29 86.99 -0.95
3,500 226.66 340.13 12.61 274.17 411.45 11.53 284.84 427.41 11.79 58.18 87.28 -0.82
3,600 238.25 347.59 12.58 284.00 414.30 11.59 295.23 430.68 11.92 56.98 83.09 -0.66
3,700 245.78 348.87 12.50 293.79 417.05 11.66 304.60 432.39 11.96 58.82 83.52 -0.54
3,800 252.49 348.98 12.41 307.28 424.64 11.69 317.63 438.97 11.99 65.14 89.99 -0.42
3,900 262.34 353.28 12.46 315.35 424.69 11.70 323.26 435.36 11.98 60.92 82.08 -0.48
4,000 275.40 361.60 12.53 329.21 432.27 11.73 342.28 449.36 11.90 66.88 87.76 -0.63
4,100 288.14 369.10 12.60 338.34 433.39 11.73 346.87 444.37 11.76 58.73 75.27 -0.84
4,200 301.03 376.43 12.64 344.65 430.99 11.60 355.07 444.01 11.76 54.04 67.58 -0.88
4,300 311.36 380.30 12.61 355.86 434.64 11.54 361.48 441.53 11.82 50.12 61.23 -0.79
4,400 316.23 377.48 12.49 362.79 433.08 11.65 367.63 438.85 11.80 51.40 61.37 -0.69
4,500 317.42 370.48 12.38 372.63 434.89 11.69 375.88 438.69 11.81 58.46 68.21 -0.57
4,600 320.60 366.06 12.33 375.74 429.00 11.62 380.20 434.08 11.89 59.60 68.02 -0.44
4,700 324.89 363.06 12.36 383.14 428.18 11.59 383.71 428.83 11.95 58.82 65.77 -0.41
4,800 331.78 363.03 12.44 393.62 430.67 11.59 395.36 432.59 11.96 63.58 69.56 -0.48
4,900 340.56 365.03 12.55 395.94 424.40 11.68 390.34 418.38 11.82 49.78 53.35 -0.73
5,000 349.39 367.01 12.61 405.60 426.07 11.71 403.96 424.34 11.64 54.57 57.33 -0.97
5,100 358.90 369.61 12.64 411.19 423.45 11.61 407.27 419.38 11.64 48.37 49.77 -1.00
5,200 365.67 369.34 12.67 413.06 417.20 11.55 410.65 414.79 11.69 44.98 45.45 -0.98
5,300 370.86 367.51 12.68 421.33 417.52 11.58 422.41 418.60 11.73 51.55 51.09 -0.95
5,400 373.10 362.89 12.69 423.17 411.60 11.59 430.72 418.92 11.72 57.62 56.03 -0.97
5,500 375.05 358.15 12.74 436.37 416.72 11.53 429.77 410.40 11.64 54.72 52.25 -1.10
5,600 375.66 352.33 12.82 437.65 410.43 11.15 438.23 410.99 11.63 62.57 58.66 -1.19
5,700 376.55 346.96 12.86 440.09 405.52 10.68 439.88 405.33 11.68 63.33 58.37 -1.18
5,800 377.34 341.70 12.86 449.12 406.71 10.25 448.67 406.29 11.75 71.33 64.59 -1.11
5,900 379.26 337.62 12.87 455.84 405.78 10.06 452.75 403.05 11.77 73.49 65.43 -1.10
6,000 382.79 335.08 12.90 460.83 403.40 10.01 461.03 403.57 11.76 78.24 68.49 -1.14
6,100 386.05 332.39 12.93 465.05 400.41 10.00 464.82 400.19 11.62 78.77 67.80 -1.31
6,200 390.11 330.47 12.96 468.40 396.76 10.00 466.25 394.97 11.51 76.14 64.50 -1.45
6,300 393.56 328.10 12.99 468.93 390.94 10.00 473.65 394.84 11.52 80.09 66.74 -1.47
6,400 394.67 323.89 12.98 482.06 395.61 10.00 480.69 394.48 11.55 86.02 70.59 -1.43
6,500 395.08 319.24 12.94 482.27 389.67 10.00 489.32 395.39 11.46 94.24 76.15 -1.48
6,600 393.25 312.94 12.88 481.81 383.44 10.00 483.71 384.95 11.09 90.46 72.01 -1.79
6,700 389.76 305.54 12.82 483.57 379.07 10.00 499.58 391.60 10.98 109.82 86.06 -1.84
6,800 383.91 296.52 12.70 487.13 376.25 10.00 487.85 376.76 10.96 103.94 80.24 -1.74

Smog Check

Seldom do other criteria take precedence over horsepower and torque figures when we install power adders on Mustangs. However, in the case of the Roush 2.3-liter Twin Vortices Series kit (PN 421388; Phase 1), the research we performed in another dyno cell makes performance a secondary subject.

Our objective was to independently test the actual smog legality of the new Roush unit by putting it through the paces of a California State Emissions Test. So to do this, before installing the Roushcharger we took Kurt Schutte's '11 Mustang GT to Haven Mobil in Rancho Cucamonga, California, where emissions technician Henry Mojica performed a non-official (test values are not reported to or saved in the state's database) emissions pre-test using the STAR-certified station's emissions dyno.

As expected, in stock trim Kurt's GT was well within legal smog parameters, registering low hydrocarbons (0 parts per million), carbon monoxide (0.01 percent), and nitrogen oxide (1 parts per million) in the 25-mph run test. However, results of the smog test which followed the blower installation were surprising. Contrary to our pessimistic thought, the Mustang GT's emissions actually were cleaner with the Roushcharger sending boosted air into the Coyote 5.0 engine.

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In this age of trying to maintain a clean “green” environment, there's a lot to be said about a bolt-on '11-'13 Mustang supercharger system that generates solid rear-wheel power, and still meets the tough emissions standards of California's Air Resources Board.