Thanks GDC-SRT and Zahanama for the explanations. I got lost in the talk of fuel rails and such.

I have another question, which may be obvious, but obviously not to me. I've seen A/F graphs other people have posted that were rather flat and at the ideal A/F ratio across the RPM spectrum. I believe this was achieved with an ECU tune - no parts required.

So, my question is: why go to all the trouble of reinventing the wheel and managing a fuel pressure regulator?

Don't get me wrong, I'm just trying to understand. I'm not knocking what Woody is doing. He's a pretty amazing guy in the mad scientist sort of way.