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Old 05-25-2021, 07:38 PM   #3
Kroggers
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Join Date: Dec 2011
Location: Finland
Posts: 270
Quote:
Originally Posted by ike84 View Post
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
Thank you for your input and good link.

You are correct, in theory based on the numbers my engine is running perfectly, but I did a run with the Durametric attached and the numbers NEVER change, so no adaptation at all, and this can ot be correct.

I did some searching and found this discussion from some years back where someone in Germany has the same problem with a racing car that has been modified in very much the same way - but the discussion was never concluded and he never posted the results or fix

https://www.renntech.org/topic/53016-afr-values-not-adapting-rich-injection-time-too-long/
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