Quote: Originally Posted by
turbojonsrt4 
How is dropping the base pressure going to richen the car up? That would lessen the amount of fuel unless I'm somehow thinking wrong, don't see how though. I run 50 psi base because thats what Kevin told me to for the flash. I need more than a little bit of fuel. I'm pretty much out of fuel at 20 psi and I plan to run 30+.
If you have a walbro 255 and are running out of fuel at 70psi total fuel pressure, its not your pump! At 20psi I doubt your maxing the pump. Unless the voltage at the pump is weak or there are restrictions in the lines, like sharp 90 deg bends or small diameter fuel lines.
Just because it goes lean doesn't mean that you need more pump. But I'm not saying that at 80psi the pump will flow enough to support your setup on 30psi of boost.
Whats your duty cycle?(this will tell you if you need more injector) Is the fuel pressure dropping? (this would tell you if its a supply issue with the pump, voltage)
I think you need to do whatever bottleneck mods and rewire the pump also if you have not already. Then if its still lean and your FP is not dropping and your duty is not maxed then your calibration needs more work.
heres a chart of an external Walbro 255 pump,
what I was trying to tell you is that if your maxing your fuel pump but still have injector duty to work with then you can lower the base to flow more fuel. Of course you would need to retune for it.
