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Removal of catalytic converter |
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Dynamometer Tests
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Stock exhaust pipe, stock catalytic converter, muffler removed (test #5223) vs. stock exhaust pipe, muffler removed, catalytic converter removed (test #5226). Note: This is very loud and results in poisonous emissions that are harmful to human life. Please don't annoy or poison your neighbors by driving without a muffler or catalytic converter on the street. Tested on 97 S Series DOHC with stock internals. Measured at the flywheel.
| 5223 includes K&N drop-in filter, all else stock, stock cat, no muffler | | | | | | | | | | | | X>14.7=lean | | 5226 removes stock catalytic converter - stock piping, no muffler, no cat | | | | | | | | | | | | X<14.7=rich | | | | | | | | | | OIL TEMP | WATER TEMP | AIR FLOW | % LAMBDA | A/F Ratio | | | RPM | 5223 TQ | 5223 HP | 5226 TQ | TQ GAIN | 5226 HP | HP GAIN | DEG F | DEG F | SCFM | 1/AF RATIO | (X:1) | | | 4000 | 120.0 | 91.4 | 123.9 | 4.0 | 94.4 | 3.0 | 181.0 | 183.0 | 105.9 | 0.903 | 13.27014 | | | 4100 | 121.5 | 94.9 | 125.9 | 4.4 | 98.3 | 3.4 | 181.0 | 183.0 | 113.3 | 0.893 | 13.12251 | | | 4200 | 121.5 | 97.2 | 125.9 | 4.4 | 100.7 | 3.6 | 181.5 | 183.0 | 117.7 | 0.889 | 13.06164 | | | 4300 | 121.3 | 99.3 | 126.2 | 4.9 | 103.3 | 4.0 | 182.0 | 183.0 | 120.2 | 0.889 | 13.0699 | | | 4400 | 122.0 | 102.1 | 126.8 | 4.9 | 106.2 | 4.1 | 182.0 | 183.0 | 123.4 | 0.892 | 13.11082 | | | 4500 | 122.6 | 105.1 | 127.8 | 5.2 | 109.5 | 4.4 | 182.5 | 183.0 | 127.0 | 0.896 | 13.17065 | | | 4600 | 123.6 | 108.2 | 128.8 | 5.2 | 112.8 | 4.6 | 182.5 | 183.0 | 131.4 | 0.906 | 13.32521 | | | 4700 | 124.7 | 111.6 | 129.5 | 4.8 | 115.9 | 4.3 | 182.5 | 183.0 | 135.3 | 0.907 | 13.33267 | | | 4800 | 125.3 | 114.5 | 129.8 | 4.5 | 118.6 | 4.1 | 182.5 | 183.0 | 139.9 | 0.899 | 13.21186 | | | 4900 | 125.8 | 117.4 | 129.8 | 4.0 | 121.1 | 3.7 | 183.0 | 183.0 | 142.6 | 0.887 | 13.04246 | | | 5000 | 126.2 | 120.1 | 129.2 | 3.0 | 123.0 | 2.9 | 183.0 | 183.0 | 145.0 | 0.873 | 12.83411 | | | 5100 | 126.2 | 122.5 | 128.9 | 2.7 | 125.2 | 2.7 | 183.5 | 182.5 | 149.2 | 0.863 | 12.68212 | | | 5200 | 125.7 | 124.5 | 128.1 | 2.4 | 126.8 | 2.4 | 183.5 | 182.5 | 154.6 | 0.858 | 12.61768 | | | 5300 | 125.1 | 126.2 | 127.2 | 2.2 | 128.4 | 2.2 | 183.5 | 182.5 | 162.0 | 0.857 | 12.60263 | | | 5400 | 124.1 | 127.6 | 126.0 | 1.9 | 129.5 | 1.9 | 184.0 | 182.5 | 167.1 | 0.853 | 12.53974 | | | 5500 | 123.2 | 129.0 | 124.9 | 1.7 | 130.9 | 1.8 | 184.0 | 182.5 | 172.8 | 0.851 | 12.50666 | | | 5600 | 122.4 | 130.5 | 123.7 | 1.3 | 131.9 | 1.4 | 184.0 | 182.5 | 172.4 | 0.849 | 12.48629 | | | 5700 | 120.9 | 131.2 | 122.6 | 1.8 | 133.1 | 1.9 | 184.0 | 182.5 | 173.9 | 0.849 | 12.48615 | | | 5800 | 119.1 | 131.5 | 121.4 | 2.3 | 134.1 | 2.6 | 184.5 | 182.5 | 173.4 | 0.850 | 12.49933 | | | 5900 | 117.2 | 131.7 | 119.9 | 2.7 | 134.7 | 3.0 | 184.0 | 182.5 | 175.3 | 0.851 | 12.50694 | | | 6000 | 115.6 | 132.1 | 118.1 | 2.4 | 134.9 | 2.8 | 184.5 | 182.5 | 176.7 | 0.850 | 12.50139 | | | 6100 | 114.4 | 132.9 | 116.9 | 2.5 | 135.7 | 2.9 | 184.5 | 182.5 | 178.8 | 0.853 | 12.5446 | | | 6200 | 112.5 | 132.8 | 115.0 | 2.5 | 135.8 | 3.0 | 184.5 | 182.5 | 179.2 | 0.858 | 12.6126 | | | 6300 | 111.0 | 133.1 | 113.8 | 2.9 | 136.5 | 3.4 | 185.0 | 182.5 | 180.7 | 0.872 | 12.81216 | | | 6400 | 109.2 | 133.1 | 111.8 | 2.6 | 136.2 | 3.2 | 185.5 | 182.5 | 183.2 | 0.891 | 13.09291 | | | 6483 | 106.4 | 131.7 | 109.5 | 3.1 | 135.1 | 3.4 | 185.5 | 182.5 | 186.0 | 0.890 | 13.08354 |
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