There's a pressure relief, yes. Don't ask me if it's possible to still get significantly higher effective pressure by redlining a cold engine. Maybe you can completely overwhelm whatever the bypass passage is, heh. With just 1-2 minutes of warmup the pressure drops pretty significantly. I'd still *prefer* to wait longer, but you could drive it and keep the revs down if you had to.
There might be situations where I'd nail the car all out from dead cold, but I don't think any of them are situations where I would even remotely care whether the engine was damaged afterwards. In other words, it'd really have to be life-or-death or something close to it. I don't think a pregnant wife ferry to a hospital 5 miles away is one of them. It's a 5 minute drive, you can afford a 1-minute warmup, and then staying at low revs and obeying the speed limit. She doesn't need the extra danger-factor from you driving all-out at that point anyways. I'd expect with a baby on the way you'd have a baby-compatible car to use to boot. mom+pop+carseat != fits in 370Z.
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