I have a walbro 255 on my car and a votech s trim with the larger pulley i am ok car is puttn down 540s rwhp. when i put the smaller pull on it puts down around 590 but start going lean around 6000 rpm. need just a little more psi i have ford 42pd inj (green tops) so they can handle more psi just need to know how to get more psi to the rails?? i know i will need a regulator but how do i get more psi out of the pump((stock fuel system except for pump and fuel rails)

 

help us, help you. Is your fuel pressure dropping at WOT? or are maxing out the injectors? If your fuel pressure is just dropping you might just want to do the racetonix hotwire kit, it increases power to the pump by 30%
http://www.racetronix.biz/itemdesc.a...WH-001&eq=&Tp=
if your fuel pressure is NOT dropping at WOT then get the right size injectors. 590 RWHP with a power adder should need like a 52# injector atleast!
If you need bigger injectors and want to save some money FIC can resize you injectors for $200 for the set. Just give them a call
http://fuelinjectorconnection.com/shop/

 

thanks kinda like the resize idea and price is right...

 

You definitely should be looking at a bigger set of injectors, but at 590 you are out of fuel pump. You re going to need some upgrades here... most are done at approx 550 with forced induction. Let me know if I can help.