I was told that as your psi increase you ecu should supply more fuel, that make sense to me. Currently my car stays static at ~14 AFR. Does that mean car is running correctly because as the ecu is keep the car stoichiometric. Or should the afr actually drop lower?

 

which wideband is it and are you sure it's working right?

 

14 is good for idle/cruise. You are correct that afr's go down as boost increases. Look into aaron cakes website.

Everyone has a slightly different opinion, but at around 10psi and up, afr's should be no more than 12's, depending on which turbo/intercooler/aux injection of course.

 

the stock maps actually run a bit lean until around 4-5psi ish. most stock FDs i test for example run into the 14's all the way up until about 5psi where it then drops like a rock down to the 11 range at 10 psi.

 

^ Yes, my datalogs have consistently shown AFRs in the 13s when the turbo initially starts to build boost, but it quickly drops to a safer mixture (12s then 11s) as pressure builds. It all happens so quickly that's it's hard to notice without a datalog.