986 Forum - The Community for Porsche Boxster & Cayman Owners - View Single Post - 3.6 Transplant issue with the o2 sensors.

ike84 · 05-25-2021, 05:47 PM

I have been trying to find definite descriptions of these terms for a while and have had limited luck. From what I have cobbled together from the interwebs is this;

These are all long term fuel trim adaptations.

rkat is idle adaptation and should be at 0.

Fra is running adaptation and should be at 1.

Frau/frao are different load range for the running adaptation. Cannot find defined rpm or load ranges, but they should also be at 1.

Here's the best single website I have found about this.

https://www.callasrennsport.com/blog/porsche-986-996-987-997-fuel-trim-information

In other words, your fuel trims are perfect!

Sent from my POCOPHONE F1 using Tapatalk

05-25-2021, 05:47 PM	#2
ike84 Registered User Join Date: Oct 2020 Location: KY Posts: 1,214	I have been trying to find definite descriptions of these terms for a while and have had limited luck. From what I have cobbled together from the interwebs is this; These are all long term fuel trim adaptations. rkat is idle adaptation and should be at 0. Fra is running adaptation and should be at 1. Frau/frao are different load range for the running adaptation. Cannot find defined rpm or load ranges, but they should also be at 1. Here's the best single website I have found about this. https://www.callasrennsport.com/blog/porsche-986-996-987-997-fuel-trim-information In other words, your fuel trims are perfect! Sent from my POCOPHONE F1 using Tapatalk __________________ 2000 Box Base, Renegade Stage 1 performance mods complete, more to come When the owners manual says that the laws of physics can't be broken by this car, I took it as a challenge...