Since Bruce let the cat outa the bag I'm probably safe in expounding but I have talked to Mr. Chu and I know he wants to offer more logging like this on DS in the future when he has time. The system isn't perfect as you have to build a conversion table but it sure works.
I am using the Turbolink boost harness so even though I'm not a turbolink full unit customer at least I am a customer(competing DS vendor plug
). At first I was using it to log boost through MAT but you have to build your own lookup table to convert temp to psi and thats not real easy unless you have a regulated air source to feed the map and get all the numbers you want say 15-25psi.
Anyway, I then built the wideband unit and figured if 0-5V can be fed in from the MAP then surely 0-4V can be from the WB. I talked to a couple gurus and we determined I probably wouldn't let the smoke out anywhere
and got everything wired in to give it a try. I then made a small adjustable voltage source and fed mock values into the WB/boostharness/MAT line and built a table of voltage to temp which easily gives A/F from a online chart at diy-efi. Basically 60 degrees is 14.7:1 and 83 is 11:1.
WideBand....don't leave home without it
By the way Dave, my current commanded AF on DS is 10.4 but I imagine that number only means something on my car and depends on the inj constant and a LOT of all the other PE stuff and probably the injectors themselves but at least its interesting to know what the ecm is thinking when its adding fuel but thats about all its worth is a reference.
So now by simply unplugging the WB voltage feed into the harness and plugging in my 3 bar map I can switch between logging A/F or boost and see the whole show at 18 f/s which is gold in my book.
So thank you Ken, Kent and all the hardwork people at diy-efi and a bit of work myself to bring this morsel of into to the TR community