The HKS V-Cam system gives the RB26 variable valve timing on the inlet side, a dedicated unit that replaces the inlet camshaft, patched into the F-Con Pro and with it's own oil feed. The unit I am having fitted in effect gives me variable cam between 248 degrees and 290 degrees, dynamically controlled by the engine management. In my set up, this is paired with the 270 degree, 10.25mm lift Tomei Procam outlet camshaft.
The end result is more available torque lower down, and some spooling gains. My horsepower may actually drop a bit, but as some RB26 installations have seen gains in excess of 40ft/lb, it's a worthwhile tradeoff. Potentially my GT-SS could be spooling from 1500rpm.
Note, all the above is my limited understanding from talking with experts. Figures are best case.
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