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adjustable cam gears on an SR20 are the biggest waste of cash I could imagine, and I bet you want a reason. Okay, here is my reason.
#1. The only way to get your money's worth out of adjustable camshaft gears is to actually adjust them. On a Dyno. With a laptop in hand to adjust the timing and air/fuel ratio, pass after pass after pass after pass, to determine the proper, "correct" valve timing.
#2 Lets say you go through that entire process and finally, after 50-80 dyno passes, you have it perfect. yay, you gained 20 horsepower at the expense of 5 ftlbs of torque. not to shabby. Then, you decide to change your intake manifold, or your exhaust manifold, or something. anything. Guess what? You have just un-done ALL of your work.
#3 Even if you combo is finalized, and you never change anything, and you have adjusted your combination perfectly, two more problems persist. problem A is that fact that the camshaft gears could slip and ruin your "perfection". Problem B is the fact you just wasted some percentage of life of your engine, on a dyno doing WOT passes. All engines will go WOT only a limited number of times before they wear out. I Knew a guy who went through ALL of that dyno-time and made his 50 passes on an RB25 Neo engine to get it "perfect". He drove it to the track, and on the FIRST pass, it blew the engine due to oil pump failure.
IF he had made ONE less pass on the dyno, he could have at least gone down the track ONE time before toasting the engine. My opinion? Re-install OEM gears and don't look back.
Lesson learned.
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