When I say cruise I mean 3000 rpm on the freeway (100 km/hr). At that point I'm pretty sure I'm on the primary main jets.
I'm using this wideband as another tuning tool in the toolbox. I'll be taking it to the track soon, but I'd like to get my wot down to 12.5-13 first, and experiment from there.
I've been using the wideband and vacuum gauge to set the idle mixture. I think it's nailed down pretty well now. I'm amazed how such a small change in the mixture screws affects the afr.
When are the extended secondary jets recommended? Last time at the track it ran 12.6, but I think low 12's are realistic. It 60' 1.74 last time. Any idea what the air/fuel datalog will look like when the secondary jets go dry? I guess it would lean out for a while, then come back?
thanks for the help,
81 Grand Prix, 355, 700r4, 8.5" 4.10
64 Oldsmobile Jetstar, all original