In Reply to: Fuel pressure regulator... posted by Cheuk in Seoul on October 29, 2000 at 17:55:36:
"Stock for a 2.8 is 24#. I am upgrading to 26# to make the fuel curve a little richer. I have heard that this is a common upgrade amoung BMW club racers and turbo / supercharger conversions."
I thought stock was 18# actually. How are you planning on correcting your idle+cruising mixtures when you upgrade your injectors? Alone they will make you run rich and your DME is just going to adapt out the extra fuel. The adaptation is applied against your WOT maps so you won't really see much (if any) mixture gain. Have you checked your mixture to see if you need extra fuel when under boost?
The trick is to get the extra fuel when you need it and not when you don't. The boost sensitive fuel pressure regulator does this pretty well. There are other ways to get a little extra fuel under boost too.