DSPORT Magazine technical showcase editorial on EVO 4G63 camshaft options

The TOMEI Powered 290 camshafts proved a 34.7-percent increase in peak power.

MANUFACTURER: TOMEI POWERED
ENGINE MODEL: 4G63 EVO 8
CAMSHAFT PN# (INTAKE): 1454290115
CAMSHAFT PN# (EXHAUST):1455290115
SPEC CARD# : GSC-6008S3

INTAKE EXHAUST
CAM TIMING EVENTS
Centerline 110° 115°
Valve Opening @ 1.0mm 6.1° BTDC 59.7° BBDC
Valve Opening @ 0.050″ 2.53° BTDC 56.1° BBDC
Valve Closing @ 1.0mm 55.8° ABDC 0.7° ATDC
Valve Closing @ 0.050″ 51.8° ABDC 2.9° BTDC
DURATION
Actual Duration @ 1.0mm 241.9° 240.5°
Actual Duration @ 0.050″ 234.3° 233.2°
Claimed Duration @ 1.0mm 242.0° 241.5°
PEAK LIFT
Peak Valve Lift 11.5mm (0.455″) 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 290-11.5 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 290 camshafts

TOMEI Powered 290 camshafts for the 4G63 engine

INFO

Hands down, these camshafts made the most power. Not only did the TOMEI 290s eclipse the 600-wheel horsepower mark, they completely destroyed it. With a power increase to just under 610 wheel horsepower, this gain in power translates to a near 35 percent increase over the factory numbers. Out of the 17 grinds we tested, this set of highest-duration camshafts introduced the most lope in the idle. From 5,000 to 8,500 RPM, the TOMEI 290s delivered enormous amounts of power as the RPMs continued to rise. Compared to the TOMEI 280s, these 290s trade low-tomidrange power below 5,000 RPM for peak power just prior to redline. TOMEI 290s required upgraded valve springs.


RUNDOWNDSPORT Magazine technical showcase editorial on EVO 4G63 camshaft options

DSPORT Magazine technical showcase editorial on EVO 4G63 camshaft options

608.20 WHP @ 8,400 RPM
419.42 LB-FT @ 7,000 RPM

Peak power checked in at 8,400 RPM, with the power curve remaining flat all the way to redline. Peak boost was reached at about 4,600 RPM. A flat torque band from 5,000 to 8,000 RPM delivered a peak torque figure of just over 415 lb-ft. Peak torque was achieved at 6,600 RPM. The highest VE values were recorded between 6,000 and 6,500 RPM. VE figures registered higher than the factory units from 4,000 RPM to the top.

HORSEPOWER

RPM/WHP FACTORY TOMEI 290 GAIN/(LOSS)
2500 49.66 40.78 (8.88)
3000 82.45 53.94 (28.51)
3500 112.31 75.99 (36.32)
4000 166.27 117.53 (48.74)
4500 281.42 201.54 (79.88)
5000 323.28 340.34 17.06
5500 371.95 415.78 43.83
6000 399.03 462.60 63.57
6500 415.72 505.48 89.76
7000 451.50 550.11 98.61
7500 N/A 573.60 N/A
8000 N/A 584.30 N/A
8500 N/A 599.19 N/A

VOLUMETRIC EFFICIENCY

RPM/% FACTORY VE TOMEI 290
2500 80.5 87.4
3000 88.2 92.9
3500 98.6 96.3
4000 85.9 95.6
4500 85.0 98.0
5000 89.1 97.1
5500 92.1 97.8
6000 88.7 99.1
6500 88.8 100.0
7000 84.9 97.0
7500 N/A 92.3
8000 N/A 90.0
8500 N/A 84.5
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