Just tested this on my s4 turbo, with three clicks richer adjustment on the clock spring, it got me roughly from 12.9-13.2 afr under boost down to high 11 - mid 12's range according to my AEM UEGO wideband. seems to like it on 10psi stock turbo and injectors. im thinking it would be fairly safe with colder plugs and an e85 conversion? it did affect my idle afr's from 14.7ish down to 13.5 - 13.0, cruising afr's are still good and lean though

 

I just did 6 clicks on my half bridge, richened it right up

Got rid of my part throttle stumble and my 3k rpm lean spot( or so it feels)
Seems like I got a pretty smooth running STOCK ECU half bridge
Hooray me!

I'll dyno this summer once I get a wide band since our dyno here in town doesn't seem to have afr or egt.
Stupid diesels just chasing numbers where I'm from

 

After reading this i did it on my 88 with a s5 street port keg. I leaned out 2 clicks it revs smoother and part 5th gear pulls way harder. I do noitice a few spots around 3k and around 5-6k were it feels like the power "flattens out" durring wot.