A returning customer came in yesterday to have a set of GSC stage 1 cams fitted on his Evo 9. To our pleasant surprise they did not give poor vacuum under low loads as would be typical of aftermarket cams with aggressive overlap. This means idle quality is stock-like.
This set of cams is superior in every way to the stock cams; there was no loss in torque, and there was significant increase in power in the entire rev range after 3600 RPM.
After reprogramming the ECU the car eventually made almost 40 PS at wheels more than when it came in at the same boost levels, and on the same petrol.
As a frame of reference, a 2.5L WRX STI with 265 PS at crank does about 210 PS at wheels on this dyno.
Update: Due to the an input error in the dyno's gear ratio calculation, the measured torque is underrated by 5.8%! Horsepower remains the same. The corrected peak torque figure measured at wheels should be 441 Nm @ 4422 RPM.
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