DSPORT Magazine technical showcase editorial on EVO 4G63 camshaft options

MANUFACTURER: TOMEI POWERED
ENGINE MODEL: 4G63 EVO 8
CAMSHAFT PN# (INTAKE): 1454270115
CAMSHAFT PN# (EXHAUST):1455270115
SPEC CARD# : N/A

INTAKE EXHAUST
CAM TIMING EVENTS
Centerline 110° 115°
Valve Opening @ 1.0mm 2.6° ATDC 52.2° BBDC
Valve Opening @ 0.050″ 6.0° ATDC 48.5° BBDC
Valve Closing @ 1.0mm 47.6° ABDC 7.5° BTDC
Valve Closing @ 0.050″ 43.6° ABDC 11.0° BTDC
DURATION
Actual Duration @ 1.0mm 225.0° 224.8°
Actual Duration @ 0.050″ 217.7° 217.5°
Claimed Duration @ 1.0mm 242.0° 241.50°
PEAK LIFT
Peak Valve Lift 11.5mm (0.454″) 11.5mm (0.452″)
Peak Cam Lift 6.7mm (0.263″) 6.6mm (0.261″)

Manufacturer’s Pitch

TOMEI has released a wide range of camshafts for the 4G63 to suit various users’ needs. The PROCAM 270-11.5 is for the serious users who need results when every milli-second counts. These will deliver the added power and are made for increased performance from mid to high end RPM. Not for the faint hearted and will require professional setup and installation.

tomei powered 270 camshafts vertical

INFO

The mildest of the TOMEI offerings, this 270-camshaft set comes standard with a high lift of 11.5mm on both the intake and exhaust sides. Unlike some of the other 272-series camshafts tested, TOMEI’s reached peak power at a lower 7,900 RPM. While the idle quality did suffer compared to the factory camshafts, these TOMEI 270s allowed for more power to be produced from 4,000 all the way to 8,500 RPM. On our test EVO, we gained nearly 130 horsepower over the factory bumpsticks. With the TOMEI 270s installed in the EVO, we experienced a 20 percent gain in power with no additional boost pressure.


RUNDOWN

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

570.62 WHP @ 7,900 RPM
407.05 LB-FT @ 6,000 RPM

Peak power checked in at 7,900 RPM, while the power curve stayed flat from 7,500 RPM all the way up to the 8,500 RPM. Peak boost was reached at 4,700 RPM. A flat torque curve from 5,300 to 7,300 RPM reached a maximum just shy of 410 lb-ft at 6,000 RPM. The highest VE value of 99 was recorded between 6,000 and 6,500 RPM. From 4,000 RPM to redline, the TOMEI 270’s VE values trumped the factory VE numbers.

HORSEPOWER

RPM/WHP FACTORY TOMEI 270 GAIN/(LOSS)
2500 49.66 49.85 0.19
3000 82.45 61.12 (21.33)
3500 112.31 90.37 (21.94)
4000 166.27 131.91 (34.36)
4500 281.42 246.26 (35.16)
5000 323.28 344.66 21.38
5500 371.95 411.78 39.83
6000 399.03 464.16 65.13
6500 415.72 494.24 78.52
7000 451.50 527.22 75.72
7500 N/A 546.89 N/A
8000 N/A 558.51 N/A
8500 N/A 546.97 N/A

VOLUMETRIC EFFICIENCY

RPM/% FACTORY VE TOMEI 270
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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