Tuning issue

[kurupt305]

Why does it seem like my tune changes by itself we command 11.0 and get 11.1 on a street run but then the next day at wot at 5k pmus rpms it leans out to 13-14afr by itself? Cars a 05 gtp

[Fivefingerdeathpunch]

Dying fuel pump?

[kurupt305]

For instance let's say 2 day I tune my car I can get it to run a perfect 11.0 all night the second the car sits overnight the following day at higher rpm it will jump up to 13 14

[kurupt305]

Could that be a cause of power enrichment or not blending the timing advance tables

[darkhorizon]

closed loop vs open loop brah.

Unplug the front o2 sensor and run open loop all day. You probably have the wrong injector constants or a busted maf table thats causing it.

[kurupt305]

Its closed loop

[darkhorizon]

right, so run open loop if you cant figure out how to make closed loop work... its not a big deal and typically with cam cars you cant ever make it work right.

[kurupt305]

Yea I got a xp cam

[kurupt305]

Dark whats a down fall of running open loop