Quote Originally Posted by Fast355 View Post
Actually if you set the Stoich to 14.13 it will even change the closed loop air/fuel ratio value to deliver MORE fuel via longer pulsewidth. Your BLMs will drop some if you already have them close to 128, you will see them shift lower overall. The shift will not be drastic, but it will definitely shift lower. If you want you can scale your VE table by multiply the whole table by 0.96. The difference between 14.7 and 14.13 is right at 4%. Pull 4% out of your VE table and you will be golden. Your open loop air/fuel ratio will be richer. Your PE air/fuel ratio will not be.
Just when you think you have things figured out this happens......Here is an example: VE tables are tuned with the same gas (no ethanol) and all BLMs are perfect (128) while in closed loop.... The scaler stoich AFR was set a 14.7 during the tuning process.... Wideband gauge is reading 14.7 AFR (1 lambda)....Now, I change the stoich AFR scaler to 13 and make a run with the same gas. You're saying the ecm is going to trim my fuel to run richer in closed loop (approximately 13 at the wideband)? In other words the BLM will increase (go above 128) to make the mixture richer than 14.7?