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Originally Posted by silver04rollas
3S GE
210 ps = 206 HP@7600rpm
Dual VVT-i is most effective at the low and midrange rpm since it controls valve timing, which in turn improves torque and high rpm horsepower to a certain extent. That makes it ideal for a low revving car rather than a high revving car.
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Toyota's dual VVT-i is pretty advanced, since it can advance and retard valve timing for emissions purposes, low-mid range response, and high end power on both camshafts. It is comparable to VVTL-i in power output per liter, as arbitrary as that is.
And, you don't have to wait for it to "kick in."
Toyota's latest crowning achievement and first performance oriented F head. 2GR-FSE, dual VVT-i, D-4 and port injection.
Here's the Red Top 200ps/196hp 3SGE with single VVT-i. ~165whp.
Modified 2ZZ - ported header, leaner a/f, custom intake. Stock 2ZZ's usually dyno around 150-155whp.
From the 3SGE and 2ZZ dynos, you can see that the 3SGE isn't as lazy off the line as the 2ZZ. This can be partly attributed to displacement gain, but is most likely caused by engine design, aggressive VVTL-i mapping, and camshafts. I would expect more torque from the smaller camshaft, but that's not the case. This makes the 2ZZ better suited for lightweight cars. This is also why Toyota revised the Corolla XRS's 2ZZ camshafts and ECU to provide better low-end torque at the expense of high end power.
My reasoning for using the 2GR-FSE as an example is to show dual VVT-i is capable of high RPM power. Toyota is currently finalizing the racing version of the 2GR-FSE, based off of the production version, which produces over
400hp @
8000rpm. Torque should be in the low-mid 300s. On the dyno graph, the engine is still capable of producing healthy amounts of torque beyond its rev limit.
Forgot to add that Toyota's dual VVT-i implementation is comparable to BMW's Double VANOS, most notably used in the 333hp 3.2L M3, and now the 500hp 5.0L M5. Better valvetrain flexibility enables this. We'll be seeing more dual VVT-i engines coming from Toyota, beginning with the new 4.6L V8, and possibly a Tundra powertrain.
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