Adding ITB to 2NZ... Big power gains

[RomanDave]

Originally Posted by kevinj93

All the gain seems to be from about 4500 RPM up. I very rarely see revs that high on my 2NZ-FE in normal road use, but more midrange would be nice. Anyone ever tried the 1NZ-FE inlet manifold and TB on a 2NZ?

It's a cylinder filling issue.

The reason it doesnt gain any power at lower rpm, is because in factory form the motor can already fill the cylinder with air very near 100% full.

Then you can only make so much torque from that much air/fuel pushing the piston down.

The only real options for low end or mid range power are forced induction or more displacement.

Or otherwise, changing the gearing can make an incredible difference.

Also when the motor doesnt completely fall over on its face when you rev it some more, it definitely changes your driving style a bit.

I've owned this car for 8 years completely 100% stock, since 30,000km old and I've always driven it like a complete nanna. As it doesnt want to rev, so you end up shifting short anyway.

But when that top end power is available, you use it!

More so when C56 is fitted :D