DSPORT Magazine technical showcase editorial on EVO 4G63 camshaft options

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″)

Manufacturer’s Pitch

The 6008R2 is a high lift, very aggressive profile with a short overall duration to keep a lower usable RPM band. The 6008R2 is designed to rev between 4000-8500 RPM and should be used with a stroked engine or added displacement engine.

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

DSPORT Magazine technical showcase editorial on EVO 4G63 camshaft optionsDSPORT Magazine technical showcase editorial on EVO 4G63 camshaft options

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

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

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
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