Quote:
Originally Posted by Toysrme
Know what ACIS is worth a shit? The 1uz-fe's.....
Besides making a new manifold, the best thing you could ever do is take a long neck plasma torch and hack the entire god damned middle of the pleumn out, front to back.
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Dunno, I think I'm going to trust the OEM engineering/testing/tuning rather than disable the system. Maybe it gets in the way when you're doing custom turbo 3VZFE builds.. but in general I don't see how it's anything
but a good thing.
Even if it's primary intent is fuel efficiency (and I don't see why that's a bad thing), it still switches over to "short" runner mode at an RPM that you're going to be at/above the whole time if you're racing.. so why bother disabling it at all? Expecting to do a lot of stop-light racing between 1000-4000rpm? heh
Quote:
Originally Posted by Jason.MZW20
In effect, you're handicapping the ACIS system (and the motor) by statically inducing a fixed intake runner. The longer runners work best from 1000-4000rpm (or whatever range the ECU is tuned for), and the shorter runners from there on.
The 3 stage system offers mid-range torque improvement from 3000-4500rpm, but can only be found on the pre-DBW VVT-i 1MZ. I think it's funny that every Toyota V engine gets an ACIS system, but all of the 4 cylinders, with the exception of the 3SGE, do not.
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Yes! It's tuned to work with ACIS. Again, there's no reason to disable it unless you're doing some whacky custom build.
And I wonder why they don't really use it on the 4-cyls.. You'd think that they would be looking for every gain possible, there.