Torque? That's not how it works as far as I know. Lets take this dyno sheet as an example, and you can find similar ones allover the net
It's a common 4 cylinder engine until around 5k rpm, producing just 120hp. After that, the vtec kicks so in just 2000rpm you get over 180hp, 60hp more. The torque instead is pretty flat all the way. Vtec engines are known for the lack of torque at any range of revs, that's why you rev the hell out of them, to get a boost in power, just like some motorbikes.
As I said the video I posted is overdone since it's a crappy game with an unrealistically tuned engine, I just wanted to show the effect that's missing in GT5. The power band in GT5 feels way too smooth, I don't feel any change at all, revving an Integra Type R or any other car without vtec feels pretty much the same, which added to the lack of good engine sounds makes them miss their charm.