1NZFE Safe REV limit

[Parmas]

I can say that many owners who built a 1NZFE focused more on the bottom end (pistons and rods) which it's the right thing... but when planning beyond certain power and boost you can't leave a stock head pure and plain!

What about a Top End build? Is there a secret for the ultimate powerband of a 1NZFE?

[rob323]

Originally Posted by Parmas

What about a Top End build? Is there a secret for the ultimate powerband of a 1NZFE?

Basically, the camshaft that you run depends where the power band will be in the rev range.
Ideally, you choose your camshaft based on the intended purpose of the vehicle and where abouts you want the power band to be in the rev range, then select valve springs (and sometimes valves) to suit, and then size your turbo, intake, exhaust and intercooling system accordingly.

In theory, the design of the 1NZFE does not suit really high revs due to the bore to stroke ratio.

If using stock cams, then the factory redline (or slightly higher if it helps with your gear change points) will suffice.