Posted by Peter Florance on August 27, 1998 at 07:29:04:
In Reply to: Re: bigger engine with e12 injection/ECU perf. mods. posted by Cliff Robb on August 26, 1998 at 13:49:29:
: Frank-
: What is you opinion about using the U.S 528i ECU w/O2 sensor on a 3.5L(either Euro or U.S.-I don't think it should matter)? If the injectors have enough duty cycle available, I would think the O2 sensor would keep the mixture right. The O2 sensor is not involved at WOT anyway. I guess if it leaned out at high rev./WOT, a rising rate fuel pressure regulator could fix it. What do you think?
: -Cliff
This might be my issue also (US 3.5l in 528i euro). My WOT mixture was lean. I went to 3.0 bar conventional felt like idle was really rich. My ECU doesn't have O2 sensor!
How does rising rate work (I mean what does it do)?
Peter