1NZFE VS 4EFTE

[CASTREX]

Originally Posted by Parmas

The only things I didn't change were the internal springs and maybe going to bigger valves. How much bhp/boost do you think the 1NZ can hold of course with the internals I have?

Any number I can say it would be pure expeculation... as there are not enough examples to go from...

Just from the top of my head I would say... I've we have see a few yaris boosting 7-8 psi on a stock motor with no problem... I think that with forged internals and a really good tune you could probably double that 14-16psi
With race gas or meth injection perhaps a little more (18psi)

But there are many factors here... not just the strenght of the internals. The abilities of your tuner will play a big role there...