MANUFACTURER: GSC Power Division
ENGINE MODEL: 4G63 EVO 8
CAMSHAFT PN#: GSC-6008S3
SPEC CARD#: N/A
| INTAKE | EXHAUST | |
|---|---|---|
| CAM TIMING EVENTS | ||
| Centerline | 109° | 115° |
| Valve Opening @ 1.0mm | 3.8° BTDC | 53.8° BBDC |
| Valve Opening @ 0.050″ | 0.4° BTDC | 50.2° BBDC |
| Valve Closing @ 1.0mm | 51.5° ABDC | 4.8° BTDC |
| Valve Closing @ 0.050″ | 47.5° ABDC | 8.1° BTDC |
| DURATION | ||
| Actual Duration @ 1.0mm | 235.3° | 229.0° |
| Actual Duration @ 0.050″ | 227.8° | 222.1° |
| Claimed Duration @ 1.0mm | 238.0° | 238.0° |
| PEAK LIFT | ||
| Peak Valve Lift | 11.7mm (0.460″) | 11.5mm (0.451″) |
| Peak Cam Lift | 6.8mm (0.266″) | 6.6mm (0.261″) |
|
||
INFO
For EVO 8 owners looking to realize even more power potential from their 4G63, GSC offers its S3 camshafts. Maximum power peaked right below 600 wheel horsepower. With an over 30 percent increase in power, the valve springs definitely need upgrading. Not surprisingly, the idle with the S3s become very rough due to camshaft loping. While power increased from 5,000 RPM to the very top, these high-lift, high-duration camshafts trade off some power on the low-end for midrange to redline power.
RUNDOWN
596.93 WHP @ 8,400 RPM
417.22 LB-FT @ 6,600 RPM
Peak power checked in just before redline at 8,400 RPM. Peak boost was reached at about 4,700 RPM. A flat torque band from 5,000 to 7,500 RPM delivered a peak torque figure of just above 415 lb-ft at 6,600 RPM. The highest VE values were recorded at 6,500 RPM. VE figures registered higher across the RPM range except for a small loss around 3500 RPM.
HORSEPOWER |
|||
| RPM/WHP | FACTORY | GSC S3 | GAIN/(LOSS) |
| 2500 | 49.66 | 43.37 | (6.29) |
| 3000 | 82.45 | 60.53 | (21.92) |
| 3500 | 112.31 | 83.53 | (28.78) |
| 4000 | 166.27 | 131.75 | (34.52) |
| 4500 | 281.42 | 239.97 | (41.45) |
| 5000 | 323.28 | 359.24 | 35.96 |
| 5500 | 371.95 | 427.24 | 55.29 |
| 6000 | 399.03 | 471.04 | 72.01 |
| 6500 | 415.72 | 508.46 | 92.74 |
| 7000 | 451.50 | 549.31 | 97.81 |
| 7500 | N/A | 579.21 | N/A |
| 8000 | N/A | 577.79 | N/A |
| 8500 | N/A | 589.84 | N/A |
VOLUMETRIC EFFICIENCY |
|||
| RPM/% | FACTORY VE | GSC S3 | |
| 2500 | 80.5 | 87.6 | |
| 3000 | 88.2 | 92.9 | |
| 3500 | 98.6 | 96.4 | |
| 4000 | 85.9 | 96.0 | |
| 4500 | 85.0 | 97.8 | |
| 5000 | 89.1 | 97.1 | |
| 5500 | 92.1 | 97.8 | |
| 6000 | 88.7 | 99.1 | |
| 6500 | 88.8 | 99.9 | |
| 7000 | 84.9 | 97.1 | |
| 7500 | N/A | 92.0 | |
| 8000 | N/A | 90.0 | |
| 8500 | N/A | 84.6 | |