Adding ITB to 2NZ... Big power gains

[kevinj93]

From memory, there was a dyno run listing from a member who discovered his 1NZ-FE was fitted with a 2NZ-FE inlet manifold. It showed a big difference when he replaced the manifold with the correct one. So there may be a difference. I would have to see the 2 side by side and compare.

Of course, if the 1NZ-FE manifold has larger cross section runners, this could actually detract from the midrange on the 2NZ-FE..

[RomanDave]

Originally Posted by kevinj93

From memory, there was a dyno run listing from a member who discovered his 1NZ-FE was fitted with a 2NZ-FE inlet manifold. It showed a big difference when he replaced the manifold with the correct one. So there may be a difference. I would have to see the 2 side by side and compare.

Of course, if the 1NZ-FE manifold has larger cross section runners, this could actually detract from the midrange on the 2NZ-FE..

The heads are the same between the two, year for year (same part number)

and thats head, cams, valve springs, valves, etc etc.

No difference there.

The intake manifolds do have either 1NZ or 2NZ moulded into the plastic but they also "seem" identical year for year.

The later model 1NZ motors look to have a different manifold where the throttle body points more upwards. I think these are ones where e-throttle is fitted.

But they've all got super long, super skinny runners.

There's not going to be a massive difference swapping between any of them, I'd imagine.