U7135 9R27 and tuning

[Charger250]

I like to load the latest tune, but with the 9R27 and the 5.7L R/T I find adjusting wot fuel has no impact to the tune, and I find the 93 tune to be richer than stock.

Using a wideband O2. I will need to go back to 9R26 to see if I can adjust the a/f ratio.

[Charger250]

Anyone tested this? I am going to try the 9R26 version to make sure I can modify the fuel at WOT, but if 9R27 is required for the latest calids then I may be in trouble if the dealerhip updates my car.

[mikel]

Nothing changed in the tunes from 9r26 to 9r27...

[Charger250]

Thanks, but with 9r27 adding or removing as much as 20% fuel has 0 impact to the a/f ratio according to my wideband O2. Going to try 9r26 when my car gets back from the dealership.

[mikel]

Can you write the tune with no changes, export it, then write the tune with 20% fuel added, and export that, and post them here?

[Charger250]

How do I export it? Sure Ill give it a try. I dont like using older tunes, but its looking to me like its not allowing me to adjust the a/f ratio.