Commanded AFR Flowchart Question

[lplott]

http://forum.efilive.com/attachment.php?attachmentid=996&stc=1&thumb=1&d=1159733379 (http://forum.efilive.com/attachment.php?attachmentid=996&d=1159733379)I borrowed this flowchart from another thread and I have a question. Running a COS w/boost in open loop, isn't both the PE input and Lean Cruise turned OFF. So the only real inputs to Commanded AFR would be B3647 and B1208?

Can someone explain B1208 to me?

Thanks,
Lonnie (Can't wait for Road Runner/EFILive realease):cheers:

[lplott]

corrected link
http://forum.efilive.com/attachment.php?attachmentid=996&d=1159733379

[dc_justin]

Cat overtemp protection also can alter AFR as well as Piston Protection (I've never run into this situation, but it's there).

You don't necessarily have to have PE disabled in a boosted application. I personally run slightly richer than N/A AFR values from 100kPa to 120kPa, then have PE kick in and richen it up another a bit more. Gives me a better transition into boost at part throttle.

But if you do have it disabled and do all of your fueling with B3647 and have COT protection disabled and Abuse Management is not a concern, then yes, B3647 will likely be the only factor into your commanded AFR.