why you should install a higher pressure fpr

[mbtoloczko]

I've been looking doing a bit of research on the fuel delivery rate of our SVXes. Based on what I've found, it looks like the stock fuel system can handle no more than 230 HP without going lean at WOT. The stock injectors are 275 cc/min capacity (at 43 psi), and according to the service manual, the SVX fuel pressure is set to 36 psi at WOT. If I have a jaunt over to this page:

http://www.rceng.com/technical.htm

and in the first worksheet use 230 HP, 6 injectors, a BSFC of 0.5, a duty cycle of 0.8, and a max fuel pressure of 36 PSI, then the worksheet spits out that 277 cc/min fuel injectors are needed for these conditions. That means that any aftermarket mods which improve airflow are going to be pushing the fuel delivery system beyond its limits. This would explain why svxfiles has been seeing improvements in power when he installed a 2000 Legacy 2.5 fuel pressure regulator which is good for 43 psi in his mildly modified SVX. Food for thought folks.