Originally Posted by Cincinnati Slim
"
What you need is to adjust the AFR to the optimum level for your modifications and prevent the programming in the Bosch ME 2.8 / 2.8.1 ECU/PCM/FMU from readjusting it..."
Er, like maybe slightly bigger (24 lbs./Hr.) injectors ???
Slim
Bigger injectors by themselves will not alter the AFR (much)... The ECU will just trim back the the pulse to maintain 14.7:1... Unless you can force more air to match the added fuel, the engine will just alter it's operation...
Here's the point that really needs to be understood... The engine management system is programmed to maintain a stociometric (sp) state... No matter what you change or alter outside of the electronics and ECU programming... This is normally 14.7:1 AFR, which is about 2.7 parts more air than the perfect percentage that creates maximum HP...
You will get minor gains from larger air flow and larger fuel flow, but nothing like it would be if you can get the AFR down to 12.0:1 +/-