MANUFACTURER: GSC Power Division
ENGINE MODEL: 4G63 EVO 8
CAMSHAFT PN#: GSC-6008R2
SPEC CARD#: N/A
| INTAKE | EXHAUST | |
|---|---|---|
| CAM TIMING EVENTS | ||
| Centerline | 109° | 115° |
| Valve Opening @ 1.0mm | 2.46° ATDC | 56.94° BBDC |
| Valve Opening @ 0.050″ | 0.97° ATDC | 52.96° BBDC |
| Valve Closing @ 1.0mm | 50.19° ABDC | 4.38° BTDC |
| Valve Closing @ 0.050″ | 46.17° ABDC | 7.88° BTDC |
| DURATION | ||
| Actual Duration @ 1.0mm | 232.7° | 232.6° |
| Actual Duration @ 0.050″ | 225.2° | 225.1° |
| Claimed Duration @ 1.0mm | 236.0° | 236.0° |
| PEAK LIFT | ||
| Peak Valve Lift | 12.1mm (0.475″) | 12.0mm (0.474″) |
| Peak Cam Lift | 7.0mm (0.275″) | 7.0mm (0.274″) |
|
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INFO
Designed for a stroker engine, the GSC R2 camshaft set delivers extremely high lift of over 12.0mm and a shorter duration than the GSC S3s. While very different in profile to the S3s, the R2s delivered a similar power curve on our EVO test vehicle. Maximum horsepower reached just shy of the 590 mark, while power production increased from 5,000 RPM and beyond. These camshafts gave the 4G63 a very lopey, race-car-like idle. Upgraded valve springs are required for the GSC R2s.
RUNDOWN
585.57 WHP @ 8,500 RPM
415.09 LB-FT @ 6,000 RPM
Peak power checked in at the 8,500 RPM redline, while peak boost was reached at about 5,000 RPM. A relatively consistent torque band from 5,200 to 7,200 RPM delivered a peak torque figure of just above 415 lb-ft at 6,000 RPM. The highest VE values of 99.0 and higher were recorded between 6,000 and 6,500 RPM. Aside from the 3500-RPM mark, VE figures increased significantly from 2,500 to 8,500 RPM.
HORSEPOWER |
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| RPM/WHP | FACTORY | GSC R2 | GAIN/(LOSS) |
| 2500 | 49.66 | 43.26 | (6.40) |
| 3000 | 82.45 | 59.11 | (23.34) |
| 3500 | 112.31 | 83.66 | (28.65) |
| 4000 | 166.27 | 126.00 | (40.27) |
| 4500 | 281.42 | 230.94 | (50.48) |
| 5000 | 323.28 | 346.55 | 23.27 |
| 5500 | 371.95 | 421.73 | 49.78 |
| 6000 | 399.03 | 470.18 | 71.15 |
| 6500 | 415.72 | 507.09 | 91.37 |
| 7000 | 451.50 | 541.20 | 89.70 |
| 7500 | N/A | 566.98 | N/A |
| 8000 | N/A | 572.55 | N/A |
| 8500 | N/A | 585.57 | N/A |
VOLUMETRIC EFFICIENCY |
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| RPM/% | FACTORY VE | GSC R2 | |
| 2500 | 80.5 | 87.4 | |
| 3000 | 88.2 | 93.1 | |
| 3500 | 98.6 | 96.6 | |
| 4000 | 85.9 | 96.0 | |
| 4500 | 85.0 | 97.8 | |
| 5000 | 89.1 | 97.1 | |
| 5500 | 92.1 | 97.8 | |
| 6000 | 88.7 | 99.0 | |
| 6500 | 88.8 | 99.9 | |
| 7000 | 84.9 | 97.0 | |
| 7500 | N/A | 92.3 | |
| 8000 | N/A | 90.0 | |
| 8500 | N/A | 84.6 | |