[GTRSOLO]

Wouldn't the ecm allow for timing to increase once increased octane is sensed? Example if you run 87, the ecm pulls timing, then if you run 89 doesn't it re-calibrate? Then re-calibrate for 91 and 93 and so forth?

[TheRedhead]

Very happy I have the corn available here!

[four0nefive]

Here's whats interesting. This 100 octane calibration isn't available for 2017+ C7 Z06s. Most people's theory is that the 17+ LT4 (in the Z06 and I guess ZL1 too) comes from the factory able to take advantage of 100 octane fuel without needing a separate calibration.

Problem is people have done some digging in HP Tuners and haven't found anything (as far as I can remember) that shows this in the tune between and '15 and '17 Z06.

[PinHead]

Originally Posted by four0nefive

Here's whats interesting. This 100 octane calibration isn't available for 2017+ C7 Z06s. Most people's theory is that the 17+ LT4 (in the Z06 and I guess ZL1 too) comes from the factory able to take advantage of 100 octane fuel without needing a separate calibration.

Problem is people have done some digging in HP Tuners and haven't found anything (as far as I can remember) that shows this in the tune between and '15 and '17 Z06.

If that's true, it would be nice to know if the ECM's data analysis determines the approximate octane using the data from the knock sensor, EGT and A/FM.

IMHO, it wouldn't be a true determination to alter a tune to take full advantage of racing fuel(100+ Octane).