ok guys i have a ? here .... i was making 277 rwhp on 25 psi of fuel pressure.... and my a/f graph on my dyno sheet looked bad... started off the pull around like 12-13:1 then went over 15.2-5ish:1..... so my question to u is when is lean to lean and should i see a nice HP increase with increased fuel pressure and more timing? here is the graph....

 

25psi of fuel pressure Why so low?

As far as AFR at WOT it depends alot on the motor itself as to how far they can safely run lean. My car runs quickest at 12.5:1 at WOT as varified by a wide band O2.

 

Its too low when you have signs of detonation Pinging or a surge from lack of fuel.
Bump your base fuel pressure up 10 more PSI and run the car again and post what happens.

Rob

 

the low psi was because of a failing fuel pump.... i have now installed a 255lph pump... i now have 45psi at WOT gonna take it to get it dynoed agian i have since advanced some of my timing tables and gonna take it and see what she will do..... hoping for alot more but as u can see it was running up in the 15.2is:1 and it was makin me scared... didnt wanna blow my motor up... and i think it was robbing me of alot of hp.....