I just got my truck tuned and when i go WOT the AFR goes to 11.5 as commanded, but then works it's way back to 14.7 while i'm still in boost. Shouldn't i stay at ~11.5 the entire time i'm in boost? why would by AFR start creeping back to stoich? it takes about 2-3 seconds for it to get back to 14.7.

do i need to adjust any tables?

thanks!

 

Stop going WO........... What does your fuel pressure do when this happens? What Injectors and fuel pump are you running? Was the tune done in person?

 

Fuel pressure stays constant, or it drops like 1-2 lbs. Injectors are the stock Radix, 42lbs and the fuel pump is also the stock radix, which i believe is the 255. Yes, the tune was done in person on a loaded dyno.

 

you need to get ahold of your tuner, It would be nice to know what duty cycle your injectors are at. With your setup I doubt they would be maxed if fuel pressure is staying solid.

 

Injectors are definitely maxed out. I have the scan file, at WOT Inj duty cycle is over 100, tops at 103.

i'm waiting for my tuner to get back to me. I was hoping someone could shed some light if they knew. Also, my previous tune held AFR at boost. So i'm thinking it's feedback from the LTFTs.. not sure though

 

Post up the log.

 

I pushed a set of 44's over 115% without going lean. NOT that I would suggest it, but just because you are over 100 doesnt mean thats why its going lean. How many lbs boost you running? And what is your fuel pressure at idle?

 

8lbs of boost. at idle FP is 61-52lbs.

430hp and 476tq on a Mustang Dyno.

If i can figure out how to post the file, i'll show the log.

 

what do you mean FP is 61-52lb? At idle?

 

my bad... mistyped. 61-62lbs and keeps steady