Thread: Just got wideband installed 10.8 afr

Originally Posted by Tyson

just so everyone know your trims at wot are absolutely of no value they mean nothing at wot or in power enrichment who ever says otherwise is most likely not an automotive tech as every mechanics know trims are not active well in power enrichment the fact that it shows -2 is because that was the last seen LTFT that was recorded. Not trying to be a dick just don't want people thinking the roung info you could be lean at wot power enrichment and still have a -2 LTFT so make it leaner? Just saying don't pay any attention to the trims when in power enrichment wot

I remember this from over the years also, the fuel trims lock in to whatever they were just before pe, which is why you don't want to be lean at the time.

I also remembered reading about the VE tune not being "necessary" but that it's a good idea if the MAF fails but also that the pcm uses the VE as a base to start from for air/fuel mixture.

Just because tuning one way works for someone doesn't mean it's right for everyone or safe for that matter.