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Stock exhaust manifold vs. Hotshot tri-Y header |
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Dynamometer Tests
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Stock exhaust manifold, Powerstack short-ram intake kit and cat-back exhaust with straight-through muffler (test #5213) vs. Hotshot tri-Y header, Powerstack short-ram intake kit and cat-back exhaust with straight-through muffler (test #5216). Tested on 97 S Series DOHC with stock internals. Measured at the flywheel.
| 5213 includes Powerstack intake, 2-in exhaust, straight-through muffler, stock exhaust manifold | | | | | | | | | | | | X>14.7=lean | | 5216 adds Hotshot tri-Y Header | | | | | | | | | | | | X<14.7=rich | | | | | | | | | | OIL TEMP | WATER TEMP | AIR FLOW | % LAMBDA | A/F Ratio | | | RPM | 5213 TQ | 5213 HP | 5216 TQ | TQ GAIN | 5216 HP | HP GAIN | DEG F | DEG F | SCFM | 1/AF RATIO | (X:1) | | | 4000 | 119.3 | 90.8 | 122.1 | 2.9 | 93.0 | 2.2 | 177.0 | 184.0 | 113.7 | 0.857 | 12.59931 | | | 4100 | 121.2 | 94.6 | 123.1 | 2.0 | 96.2 | 1.6 | 177.0 | 184.0 | 117.5 | 0.852 | 12.53085 | | | 4200 | 121.5 | 97.2 | 123.6 | 2.1 | 98.8 | 1.7 | 177.0 | 184.0 | 123.1 | 0.850 | 12.49387 | | | 4300 | 121.4 | 99.4 | 124.2 | 2.7 | 101.6 | 2.2 | 177.0 | 184.0 | 128.9 | 0.851 | 12.50747 | | | 4400 | 122.5 | 102.6 | 125.5 | 3.0 | 105.1 | 2.5 | 176.5 | 184.5 | 137.1 | 0.857 | 12.60311 | | | 4500 | 124.1 | 106.3 | 127.3 | 3.2 | 109.1 | 2.8 | 177.0 | 184.0 | 142.5 | 0.865 | 12.72132 | | | 4600 | 126.0 | 110.4 | 128.5 | 2.5 | 112.6 | 2.2 | 176.5 | 184.5 | 149.6 | 0.875 | 12.86756 | | | 4700 | 127.4 | 114.0 | 129.2 | 1.9 | 115.6 | 1.7 | 176.5 | 184.0 | 156.7 | 0.873 | 12.83336 | | | 4800 | 128.2 | 117.1 | 128.7 | 0.5 | 117.6 | 0.4 | 176.5 | 184.0 | 161.0 | 0.859 | 12.63378 | | | 4900 | 128.5 | 119.8 | 128.0 | -0.5 | 119.4 | -0.4 | 176.5 | 184.0 | 166.6 | 0.848 | 12.47104 | | | 5000 | 127.9 | 121.8 | 127.3 | -0.6 | 121.2 | -0.6 | 176.5 | 184.0 | 174.7 | 0.832 | 12.22904 | | | 5100 | 126.9 | 123.2 | 127.0 | 0.1 | 123.3 | 0.2 | 176.5 | 184.5 | 180.1 | 0.828 | 12.16694 | | | 5200 | 126.1 | 124.8 | 126.9 | 0.8 | 125.6 | 0.8 | 177.0 | 184.5 | 186.6 | 0.826 | 12.14502 | | | 5300 | 124.7 | 125.8 | 125.9 | 1.3 | 127.0 | 1.3 | 177.0 | 184.5 | 185.6 | 0.826 | 12.14583 | | | 5400 | 123.2 | 126.6 | 125.2 | 2.0 | 128.7 | 2.1 | 177.0 | 184.5 | 185.1 | 0.827 | 12.15186 | | | 5500 | 121.6 | 127.3 | 124.8 | 3.2 | 130.7 | 3.4 | 177.0 | 184.5 | 180.9 | 0.825 | 12.12485 | | | 5600 | 120.6 | 128.6 | 124.5 | 3.9 | 132.8 | 4.1 | 177.0 | 184.5 | 179.8 | 0.827 | 12.15296 | | | 5700 | 120.2 | 130.4 | 124.1 | 3.9 | 134.6 | 4.2 | 177.0 | 184.5 | 181.1 | 0.830 | 12.1941 | | | 5800 | 119.1 | 131.5 | 122.3 | 3.2 | 135.0 | 3.5 | 177.0 | 184.5 | 176.7 | 0.828 | 12.17429 | | | 5900 | 118.1 | 132.7 | 120.0 | 1.9 | 134.8 | 2.1 | 177.0 | 184.5 | 173.1 | 0.826 | 12.13851 | | | 6000 | 117.2 | 133.8 | 118.4 | 1.2 | 135.3 | 1.4 | 177.0 | 184.5 | 173.3 | 0.825 | 12.13317 | | | 6100 | 116.1 | 134.9 | 117.6 | 1.4 | 136.5 | 1.7 | 177.0 | 184.5 | 173.9 | 0.832 | 12.23404 | | | 6200 | 114.3 | 134.9 | 115.8 | 1.6 | 136.7 | 1.8 | 177.0 | 184.5 | 174.9 | 0.839 | 12.33226 | | | 6300 | 112.1 | 134.4 | 114.3 | 2.2 | 137.0 | 2.6 | 177.5 | 184.5 | 174.9 | 0.848 | 12.46162 | | | 6400 | 110.0 | 134.0 | 111.7 | 1.8 | 136.1 | 2.1 | 177.5 | 184.5 | 178.9 | 0.861 | 12.66205 | | | 6483 | 107.4 | 132.6 | 109.0 | 1.7 | 135.0 | 2.4 | 177.5 | 185.0 | 179.6 | 0.859 | 12.62089 |
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