DSPORT Magazine technical showcase editorial on EVO 4G63 camshaft options

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″)

Manufacturer’s Pitch

The S3 Cams are available in a solid lifter cam and a hydraulic lifter Cam for the Evo 4-8 4G63. These cams are intended for the 800+ WHP to take advantage of a very large turbo. These are NOT suggested for anyone running smaller than the 67mm to GT42R turbo.

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

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

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
Share.

Comments are closed.