Quote:
Originally Posted by phunk
whos to say that the VVEL even needs any tuning for NA applications? If my assumptions are correct, its probably already on a closed loop feedback system for peek volumetric efficiency for the given RPM and load. If thats the case, I dont think there is much room to gain anything from it for NA other than perhaps a more aggressive exhaust cam. Unforunately we do not have a lot of solid information into its calibration or decision making process... however it sure as hell seems downright effective if you compare power and performance to DE's and HR's. Also consider this... bolt on mod combos are making 30-40 HP over stock on the dyno. That means the engine is up to 370+ HP with bolt-ons. That is acheiving 100hp per liter or more, at only 7500 RPM redline, with outstanding powerband and driveability... while being able to achieve ULEV status. Thats is a greatly efficient engine and at decently low RPM to be able to make such HP/displacement.
This is why it is rather unclear to me why people are so excited to either ditch VVEL or attempt to take control over it... it really appears to be doing quite well, and I would need to see some real proven data on where it is falling short before I would even think of screwing with it.
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It remains unknown... as you noted we don't have enough hard data on its range of operation -- BUT, we do know that the max lift within the programming appears to be well below what the valves are physically capable of achieving. Whether or not that will make more power is an empirical, and largely unexplored, question.
When you don't know the degree to which it can adapt, you can't know whether or not it's optimized for best power on all set-ups.
Even if it "learns", if it works similar to fuel trims, we all know that no ECU can "self-tune" as well as a human who can test variations on the factory tune on a dyno.
In the end, it presumably has some fixed targets, and operates in a closed loop around them by creating transient modifiers (i.e., "trims").
Is it optimized for best power? Who knows? It remains a black box for the most part.