DSPORT Magazine technical showcase editorial on EVO 4G63 camshaft options

MANUFACTURER: GSC Power Division
ENGINE MODEL: 4G63 EVO 8
CAMSHAFT PN#: GSC-6008S2
SPEC CARD#: N/A

INTAKE EXHAUST
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″)

Manufacturer’s Pitch

The S2 cams are designed for those with more power in mind or a larger turbo. No low-end power is lost vs. the stock cams when used with the larger turbos. The S2 cams will show gains of 50-70whp over the stock cams and in some cases more in the higher RPM. Great for 2.0L engines revving to 9000 RPM or for stroker motors revving to 8000 RPM. The S2 Cams are suggest to run on our upgraded Beehive valve spring replacement or can be run at the stock revlimit and factory boost on the stock spring. Designed for a rev range of 4000- 9000 RPM (2.0L or 3000-8000 2.2L+), 400-700whp applications. S2 cams can run on Factory ECU with custom flashing.

GSC S2 camshafts vertical

 

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

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

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

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

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
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