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The beauty of these cars lies in the handling, balance, and build quality. In this regard they are exceptional and were essentially peerless in their time.
wrong, without the change in valve timing the variable plenum will have a significantly lower effect
It's not a variable plenum. I said it would have an affect, not a large affect. It might indeed have a large affect but without trial or exhaustive calculation no one can be certain.
Also, the variocam doesn't do anything magic with the timing, it just advances the intake timing. Perhaps the S owner can manually advance the timing on both cams (since individual timing it not possible) to simulate the advanced timing of the activated variocam and augment the effect of the dual resonance intake.
The bottom line is that there's been speculation about using this intake on the 944S and S2 and how much power it would add, but I've never heard of anyone trying it.
For the record variocam activates at 1500 rpm (advancing timing on the intake cam) and deactivates at 5500 rpm (retarding the timing back to the original state). For the typical driver, this means it's constantly running with advanced intake timing, and it only retards it for a smooth idle.