MANUFACTURER: GSC Power Division
ENGINE MODEL: 4G63 EVO 8
CAMSHAFT PN#: GSC-6008S2
SPEC CARD#: N/A
INTAKE | EXHAUST | |
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CAM TIMING EVENTS | ||
Centerline | 107° | 113° |
Valve Opening @ 1.0mm | 3.1° ATDC | 45.7° BBDC |
Valve Opening @ 0.050″ | 0.6° ATDC | 42.3° BBDC |
Valve Closing @ 1.0mm | 39.3° ABDC | 3.8° BTDC |
Valve Closing @ 0.050″ | 35.7° ABDC | 7.6° BTDC |
DURATION | ||
Actual Duration @ 1.0mm | 222.4° | 222.0° |
Actual Duration @ 0.050″ | 215.1° | 214.7° |
Claimed Duration @ 1.0mm | 230.0° | 230.0° |
PEAK LIFT | ||
Peak Valve Lift | 11.1mm (0.435″) | 11.0mm (0.435″) |
Peak Cam Lift | 6.4mm (0.252″) | 6.4mm (0.251″) |
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INFO
For EVO 8 owners with an upgraded turbo, GSC offers its S2 camshaft set to extract more power. Maximum power peaked right above 550 wheel horsepower. The S2 camshafts definitely deliver a considerable increase in power but require a valve spring upgrade. However, the bump in power comes with the accompanying lopey idle. The loss in power from 3,000 to 4,000 RPM is likely due to the large runners in the aftermarket intake manifold installed on our dyno mule. We expect that with a factory manifold, the increase in power would span across the entire RPM range.
RUNDOWN
553.94 WHP @ 8,100 RPM
416.07 LB-FT @ 6,400 RPM
Peak power checked in at 8,100 RPM with the power curve remaining flat all the way to redline. Peak boost was reached at about 5,100 RPM. A flat torque band from 5,000 to 7,500 RPM delivered a peak torque figure of just over 415 lb-ft. Peak torque kicked in at 6,400 RPM. Highest VE values were recorded at 6,500 RPM, and VE figures registered higher than the factory units from 4,000 to 8,500 RPM.
HORSEPOWER |
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RPM/WHP | FACTORY | GSC S2 | GAIN/(LOSS) |
2500 | 49.66 | 52.01 | 2.35 |
3000 | 82.45 | 66.90 | (15.55) |
3500 | 112.31 | 103.59 | (8.72) |
4000 | 166.27 | 148.38 | (17.89) |
4500 | 281.42 | 287.48 | 6.06 |
5000 | 323.28 | 364.34 | 41.06 |
5500 | 371.95 | 427.50 | 55.55 |
6000 | 399.03 | 467.13 | 68.10 |
6500 | 415.72 | 494.69 | 78.97 |
7000 | 451.50 | 534.22 | 82.72 |
7500 | N/A | 532.56 | N/A |
8000 | N/A | 540.97 | N/A |
8500 | N/A | 534.50 | N/A |
VOLUMETRIC EFFICIENCY |
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RPM/% | FACTORY VE | GSC S2 | |
2500 | 80.5 | 87.9 | |
3000 | 88.2 | 93.5 | |
3500 | 98.6 | 97.0 | |
4000 | 85.9 | 96.5 | |
4500 | 85.0 | 97.5 | |
5000 | 89.1 | 97.0 | |
5500 | 92.1 | 97.8 | |
6000 | 88.7 | 99.0 | |
6500 | 88.8 | 99.9 | |
7000 | 84.9 | 97.0 | |
7500 | N/A | 92.0 | |
8000 | N/A | 89.8 | |
8500 | N/A | 84.6 |