Abysmal perfromance of 2005 Vitz RS

[ncp13]

I am thinking that maybe your throtle body was defective and not opening as much?

I have tried 1ZZ cable throtle body on my 1nz and I did not see much.I lost low end throtle response and it was happy at high rpm.

Its great that you got the power back.

[SlowVitzRS]

Originally Posted by ncp13

I am thinking that maybe your throtle body was defective and not opening as much?

I have tried 1ZZ cable throtle body on my 1nz and I did not see much.I lost low end throtle response and it was happy at high rpm.

Its great that you got the power back.

Nope, throttle was not defective (otherwise it would thrown a code).
What actually is wrong in my opinion is not the throttle size, but throttle map. the 1ZZFE throttle due to size simple overrides map as 70% opening might as well be 100% (compared to original). Toyota gimped too much the throttle map.
I can bet I would got the same result with a throttle controller.

With manual throttle if you give it 100% it is guaranteed to be 100%. With drive-by-wire not so much. Drive by wire were introduced because this way they can reduce emissions during transients (ie when you plant your foot down suddenly), and smooth out torque curve to make it more flat (at expense of peak power).