10-18-2011, 07:11 AM
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#11 (permalink)
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A True Z Fanatic
Join Date: Mar 2009
Location: Houston, TX
Posts: 4,024
Drives: too slow
Rep Power: 3596
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Quote:
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Originally Posted by UpRev
Everything we've tested shows there is zero gain with the stock cams. We've already built test software and we have a VVEL engine pulled apart that we're checking clearances on. So we're going to continue to build testing software for it and wait for some manufacturer to bring cams to market.
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Quote:
Originally Posted by Jordo!
^^^ That is really surprising. There absolutely should be more power hiding in there with the factory cams -- especially on a car with a better flowing intake and exhaust.
That also doesn't help explain why Nismos tend to dyno higher than non-nismos with equivalent mods and tune...
I are confuzed.
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Quote:
Originally Posted by Red__Zed
Hard to believe, unless there's not much more adjustment available for the factory cams.
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My interpretation of UpRev's statement is this: the ECU is pretty smart and already has full control of the available range of the stock VVEL cams, and makes good use of it when the MAF, Fuel, etc tables are set up properly for the application (intake/exhaust config, FI, etc). Therefore "cracking" VVEL probably doesn't actually allow you to gain more power through ECU tuning alone, seeing as it's already an optimally self-tuning system in realtime. But you might be able to get some gains by having a new physical VVEL cam shape/range and the ability to reprogram the relevant ECU tables to take advantage of it.
Most likely this (the capability of our ECU to self-tune VVEL to conditions) is why the car is so mod-friendly to begin with. Remember even before UpRev was available, these cars always posted unbelievably amazing gains from bolt-on exhaust and intake mods, so much that people thought others were lying about their results in the early days.
IMHO, it would probably still be nice if they put tune-ability of the tables into their product for the stock cams. It might not get you any peak dyno gain, but I bet it could open up optimization tweaks for drivability and throttle character.
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