Tuning Options

[tmontague]

As a side thought I will post this question:

Will resetting the Yaris' ECU and running 91 octane for a while cause an increase in performance? Now I know that 91 octane does not give more power over 87 on the same tune, but I am asking because the 1nz ECU is constantly learning.

The 1nz if already a relatively hgh compression engine (10.5:1) and is therefore tuned to reduce knock on 87 pump gas. If you reset and run 91 or even 94 will the knock sensor etc. allow for more advanced timing since there is no detection of knock?

It's essentially the reverse that is seen when you run 87octane in a, lets say Nissan z370. The engine retards timing to avoid knock and the performance is therefore decreased. Or is the Yaris ECU only tuned for 87 and will never let the engine go further with timing to utilize 91 or 94 octane for performance?