Bringing this ancient thread back up. Noticed that stock pressure is 36psi and people have been bumping them up to 43psi.
Let us say that your air fuel ratio is 13.6:1 and you want to bring it down to 12.8:1 for WOT horsepower purposes (Just because in your head for some reason you think it will make more power in the 12.5:1 to 13.0:1 range being naturally aspirated). Just a guess but how much of a pressure increase will you need to make this happen from the stock fuel pressure of 36psi? I am curious as to if there is a formula for this (Ex: +2psi fuel pressure increase = -.4:1 air/fuel ratio drop or richer fuel). If not, then just will have to do it by trial and error. I wish I could do a cool graph like Chike put up. Thanks for any input!
Also, is there a how-to for installation of a fuel pressure regulator here somewhere? I have a fpr regulator and gauge from my Subaru RX turbo in my garage. May as well put them to use.
BTW: Browsing the internet I ran into an interesting before and after air/fuel ratio tuning article on a Honda.
http://www.turbomagazine.com/tech/02...ing/index.html
I am not saying we can expect similar gains but it does show what proper air/fuel ratio tuning is capable of.
Wish an SAFC could be used on an SVX.